AT Command Reference Manual
for the RC288ACi and RC288ACL Modem Families
(Preliminary)

--IMPORTANT--
	This document is provided electronically for use for the
	express purpose of assisting software developers and end
	users answer frequently asked questions about Rockwell
	modem products.
	This manual ONLY describes the GENERIC Rockwell AT command
	set.  Modem vendors often change, add, and delete commands
	based on their particular product and feature set.  Thus
	this document does not necessarily describe the AT commands
	used within your modem, even if it is based on Rockwell
	chipset products. Always consult your modem vendor's
	documentation first.

Rockwell International
Digital Communications Division
©1995, Rockwell International	Order No. 1048
All Rights Reserved	Rev. 2, May 5, 1995
Printed in U.S.A.

NOTICE
Information furnished by Rockwell International Corporation is believed to
be accurate and reliable. However, no responsibility is assumed by
Rockwell International for its use, nor any infringement of patents or
other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent rights of Rockwell
International other than for circuitry embodied in Rockwell products.
Rockwell International reserves the right to change circuitry at any time
without notice. This document is subject to change without notice.

ConfigurACE is a trademark of Rockwell International.
MNP is a registered trademark of Microcom, Inc. 
Hayes is a registered trademark of Hayes Microcomputer Products, Inc.


PREFACE
Revision 2 to this document incorporates the following:
1.	Revision of the Voice Commands Section to Voice/Audio Commands Section
(Section 7) to support modem models with business audio and speakerphone
capability.
2.	Addition of Cellular Commands Section (Section 3.7) to support modem
models with cellular direct connect capability.
3.	Addition of Enable/Disable Distinctive Ring (-SDR=n) command.
4.	Addition of Enable/Disable MNP10-EC (-SEC=n) command.
5.	Addition of Enable/Disable DSVD (-SSE=n) command to support modem
models with DSVD (digital simultaneous voice and data) capability.
6.	Deletion of functions not supported in current release of MCU
firmware.
7.	General corrections.




Table of Contents
1.	INTRODUCTION	
	1.1.	OVERVIEW
	1.1.1.	Command Syntax
	1.1.2.	Command Descriptions	
	1.1.3.	Call Progress and Blacklisting Parameters	
	1.1.4.	ConfigurACE II	
	1.2.	REFERENCE DOCUMENTATION	
2.	COMMAND SYNTAX	
	2.1.	DTE/DCE INTERCHANGE CIRCUITS	
	2.2.	COMMAND SYNTAX AND GUIDELINES	
	2.2.1.	DTE Commands	
	2.2.2.	DTE Command Lines	
	2.3.	AT COMMAND GUIDELINES	
	2.3.1.	Basic Command Syntax	
	2.3.2.	Extended Command Syntax	
3.	AT COMMAND SET	
	3.1.	AT COMMAND GUIDELINES	
	3.1.1.	AT Commands, DTE Adaption	
	3.1.2.	AT Command Format	
	3.1.3.	Escape Code Sequence	
	3.2.	AT COMMAND SET	
	3.2.1.	AT Commands	
		A/ - Re-execute Command	
		AT= x - Write to Selected S-Register	
		AT? - Read Selected S-Register	
		A - Answer	
		Bn - CCITT or Bell	
		Cn - Carrier Control	
		Dn - Dial	
		En - Command Echo	
		Hn - Disconnect (Hang-Up)	
		In - Identification	
		Ln - Speaker Volume	
		Mn - Speaker Control	
		Nn - Automode Enable	
		On - Return to On-Line Data Mode	
		P - Set Pulse Dial Default	
		Qn - Quiet Results Codes Control	
		Sn - Read/Write S-Register	
		T - Set Tone Dial Default	
		Vn - Result Code Form	
		Wn - Connect Message Control	
		Xn - Extended Result Codes:	
			Table 3-1.	Result Codes	
		Yn - Long Space Disconnect
		Zn - Soft Reset and Restore Profile	
	3.2.2.	AT& Commands	
		&Cn - RLSD (DCD) Option	
		&Dn - DTR Option	
		&Fn - Restore Factory Configuration (Profile)	
		&Gn - Select Guard Tone	
		&Jn - Telephone Jack Control	
		&Kn - Flow Control	
		&Ln - Leased Line Operation	
		&Mn - Asynchronous/Synchronous Mode Selection	
		&Pn - Select Pulse Dial Make/Break Ratio	
		&Qn - Sync/Async Mode	
		&Rn - RTS/CTS Option	
		&Sn - DSR Override	
		&Tn - Test and Diagnostics	
		&V - Display Current Configuration and Stored Profiles	
		&Wn - Store Current Configuration	
		&Xn - Select Synchronous Clock Source	
		&Yn - Designate a Default Reset Profile	
		&Zn=x - Store Telephone Number	
	3.2.3.	AT% Commands	
		%En - Enable/Disable Line Quality Monitor and Auto-Retrain or Fallback/Fall Forward	
		%L - Line Signal Level	
		%Q - Line Signal Quality	
	3.2.4.	AT\ Commands	
		\Kn - Break Control	
		\Nn - Operating Mode	
	3.2.5.	AT+ Commands	
		+MS - Select Modulation	
		Reporting Selected Options	
		Reporting Supported Options	
		Subparameter Definitions	
		+Hn - Enable/Disable RPI and DTE Speed	
	3.2.7.	AT- Commands	
		-SDR=n -  Enable/Disable Distinctive Ring	
		-SSE=n - Enable/Disable DSVD	
	3.3.	ERROR DETECTION AND DATA COMPRESSION COMMANDS	
	3.3.1.	AT% Commands	
		%C - Enable/Disable Data Compression	
	3.3.2.	AT\ Commands	
		\An - Select Maximum MNP Block Size	
		\Bn - Transmit Break to Remote	
	3.4.	MNP 10 COMMANDS	
	3.4.1.	AT) Commands	
		)Mn - Enable Cellular Power Level Adjustment	
		*Hn - Link Negotiation Speed	
		-Kn - MNP Extended Services	
		-Qn - Enable Fallback to V.22 bis/V.22	
		-SEC=n - Enable/Disable MNP10-EC	
		@Mn - Initial Cellular Power Level Setting	
		:E - Compromise Equalizer Enable Command	
	3.5.	W-CLASS COMMANDS	
	3.5.1.	AT* Commands	
		*B - Display Blacklisted Numbers	
		*D - Display Delayed Numbers	
	3.6.	CALLER ID COMMANDS	
	3.6.1.	AT#CID Command	
		#CIDn - Caller ID	
		Inquiries	
		Formatted Form Reporting	
		Example of Formatted Form Reporting	
		Unformatted Form Reporting	
		Example of Unformatted Form Reporting	
	3.7.	CELLULAR COMMANDS	
	3.7.1.	Cellular Phone Drivers	
	3.7.2.	Cellular Commands	
		^C2 - Download Cellular Phone Driver	
		^I - Identify Cellular Phone Driver	
		^T6 - Indicate Status of Cellular Phone	
		Application of ^T6 Status Byte	
	3.7.3.	Operation	
		Modem Configuration	
		MNP10 EC to MNP10 EC Connection	
		MNP10 EC  to MNP10 Link Negotiation at 4800 bps (Quick Connect)	
		MNP10 EC  to Non-MNP10 Modems	
		Disabling MNP10 EC	
		Cellular Phone Configuration	
	3.8.	AT COMMAND RESULT CODES	
		0- OK	
		1- CONNECT	
		2- RING	
		3- NO CARRIER	
		4- ERROR	
		5- CONNECT 1200	
		6- NO DIALTONE	
		7- BUSY	
		8- NO ANSWER	
		9- CONNECT 0600	
		10- CONNECT 2400	
		11- CONNECT 4800	
		12- CONNECT 9600	
		13- CONNECT 7200	
		14- CONNECT 12000	
		15- CONNECT 14400	
		16- CONNECT 19200	
		17- CONNECT 38400	
		18- CONNECT 57600	
		19- CONNECT 115200	
		22- CONNECT 75TX/1200RX	
		23- CONNECT 1200TX/75RX	
		24- DELAYED	
		32- BLACKLISTED	
		33- FAX	
		35- DATA	
		40- CARRIER 300	
		44- CARRIER 1200/75	
		45- CARRIER 75/1200	
		46- CARRIER 1200	
		47- CARRIER 2400	
		48- CARRIER 4800	
		49- CARRIER 7200	
		50- CARRIER 9600	
		51- CARRIER 12000	
		52- CARRIER 14400	
		53- CARRIER 16800	
		54- CARRIER 19200	
		55- CARRIER 21600	
		56- CARRIER 24000	
		57- CARRIER 26400	
		58- CARRIER 28800	
		59- CONNECT 16800	
		61- CONNECT 21600	
		62- CONNECT 24000	
		63- CONNECT 26400	
		64- CONNECT 28800	
		66- COMPRESSION: CLASS 5	
		67- COMPRESSION: V.42 bis	
		69- COMPRESSION: NONE	
		70- PROTOCOL: NONE	
		77- PROTOCOL: LAPM	
		80- PROTOCOL: ALT	
		81- PROTOCOL: ALT-CELLULAR	
		+F4- +FCERROR	
4.	S-REGISTERS	
	4.1.	FACTORY DEFAULTS
		Table 4-1.	S-Register Summary
		Table 4-1.	S-Register Summary (ContÕd)	3
	4.2.	S-REGISTER DEFINITIONS	
		S0 - Number of Rings to Auto-Answer	
		S1 - Ring Counter	
		S2 - Escape Character	
		S3 - Carriage Return Character	
		S4 - Line Feed Character	
		S5 - Backspace Character	
		S6 - Wait Time for Dial Tone Before Blind Dialing, or After ÒWÓ Dial Modifier (W-Class Models)
		S7 - Wait Time For Carrier After Dial, For Silence, or For Dial Tone After
		ÒWÓ Dial Modifier (US Models)	
		S8 - Pause Time For Dial Delay	
		S9 - Carrier Detect Response Time	
		S10 - Lost Carrier To Hang Up Delay	
		S11 - DTMF Tone Duration	
		S12 - Escape Prompt Delay (EPD)	
		S13 - Reserved	
		S14 - General Bit Mapped Options Status
		S15 - Reserved	
		S16 - General Bit Mapped Test Options Status	
		S17 - Reserved	
		S18 - Test Timer	
		S19 - AutoSync Bit Mapped Options	
		S20 - AutoSync HDLC Address or BSC Sync Character	
		S21 - V.24/General Bit Mapped Options Status	
		S22 - Speaker/Results Bit Mapped Options Status	
		S23 - General Bit Mapped Options Status	
		S24 - Sleep Inactivity Timer	
		S25 - Delay To DTR	
		S26 - RTS to CTS Delay	
		S27 - Bit Mapped Options Status	
		S28 - Bit Mapped Options Status	
		S29 - Flash Dial Modifier Time	
		S30 - Disconnect Inactivity Timer	
		S31 - Bit Mapped Options Status	
		S32 - XON Character	
		S33 - XOFF Character	
		S34-S35 - Reserved	
		S36 - LAPM Failure Control	
		S37 - Desired Line Connection Speed	
		S38 - Delay Before Forced Hang Up	
		S39 - Flow Control Bit Mapped Options Status	
		S40 - General Bit Mapped Options Status	
		S41 - General Bit Mapped Options Status	
		S46 - Data Compression Control	
		S48 - V.42 Negotiation Action	
		S82 - Break Handling Options	
		S86 - Call Failure Reason Code	
		S91 - PSTN Transmit Attenuation Level	
		S92 - Fax Transmit Attenuation Level	
		S95 - Extended Result Codes	
		S201 - Cellular Transmit Level	
5.	FAX CLASS 1 COMMANDS	
	5.1.	FAX I/O PROCESSING	
	5.1.1.	DTE-to-Modem Transmit Data Stream	
	5.1.2.	Modem-to-DTE Receive Data Stream	
	5.1.3.	Fax Mode Selection	
		Table 5-1.	Fax Class 1 Commands	
	5.1.4.	Fax Origination	
	5.1.5.	Fax Answering	
	5.1.6.	Fax Control Transmission	
	5.1.7.	Fax Control Reception	
	5.1.8.	Fax Data Transmission	
	5.1.9.	Fax Data Reception	
	5.2.	COMMANDS	
		+FCLASS=n - Select Service Class	
		+F<command>? - Report Active Configuration	
		+F<command>=? - Report Operating Capabilities	
		+FAE=n - Data/Fax Auto Answer	
		+FTS=n - Stop Transmission and Wait	
		+FRS=n - Receive Silence	
		+FTM=n - Transmit Data	
		+FRM=n - Receive Data	
		+FTH=n - Transmit Data with HDLC Framing	
		+FRH=n - Receive Data with HDLC Framing	
	5.3.	EXAMPLES	
		Table 5-2.	Fax Class 1 Calling Sequence (One Page)	
		Table 5-3.	Fax Class 1 Answering Sequence (One Page)	
6.	FAX CLASS 2 COMMANDS	
	6.1.	COMMAND SYNTAX AND GUIDELINES	
	6.1.1.	DTE Commands	
		DTE Command Lines	
		Facsimile Command Syntax	
		Table 6-1.	Fax Class 2 Commands	
	6.1.2.	Serial Port Speed and Flow Control	
		Data Stream Termination	
		DTE to DCE Streams	
		DCE to DTE Streams	
	6.1.3.	Auto Answer	
	6.1.4.	Identification of T.30 Options	
	6.1.5.	Session Status Reporting	
	6.1.6.	Procedure Interrupt Negotiation	
	6.2.	SERVICE CLASS 2 IDENTIFICATION AND SELECTION	
	6.2.1.	+FMFR?, Request Manufacturer Identification	
	6.2.2.	+FMDL?, Identify Product Model	
	6.2.3.	+FREV?, Identify Product Revision	
	6.3.	SERVICE CLASS 2 ACTION COMMANDS	
	6.3.1.	ATD, Originate a Call	
	6.3.2.	ATA, Answer a Call	
		Manual Call Answer	
		Automatic Answer	
		Connection as a Data Modem	
	6.3.3.	+FDT, Data Transmission	
		Initiate Page Transmission	
		Continue a Page	
		Phase C Data Framing	
		Phase C Data Format	
		<CAN>, Escape from Transmission	
		Table 6-2.	T.30 Session Subparameter Codes	
	6.3.4.	+FET, Transmit Page Punctuation	
		End a Page	
		Table 6-3.	T.30 Post Page Message Codes	
		Table 6-4.	T.30 Post Page Response Messages	
	6.3.5.	+FDR, Begin or Continue Phase C Receive Data	
		Initiate Document Reception	
		Continue Document Reception	
		Phase C Data Framing	
		Phase C Data Format	
		<CAN>, Escape from Reception	
	6.3.6.	+FK, Session Termination	
	6.3.7.	+FCIG, Set Polling ID	
	6.3.8.	+FLPL, Indicate a Document for Polling	
	6.3.9.	+FSPL, Enable Polling	
		Table 6-5.	Hang Up Status Codes	
	6.4.	SERVICE CLASS 2 DCE RESPONSES	
	6.4.1.	+FCON, Facsimile Connection Response	
	6.4.2.	+FDCS:, Report Current Session Capabilities	
	6.4.3.	+FDIS:, Report Remote Station Capabilities	
	6.4.4.	+FCFR, Indicate Confirmation to Receive	
	6.4.5.	+FTSI:, Report the Transmit Station ID	
	6.4.6.	+FCSI:, Report the Called Station ID	
	6.4.7.	+FPTS:, Receive Page Transfer Status	
	6.4.8.	+FET:, Post Page Message Response	
	6.4.9.	+FPTS:, Transmit Page Transfer Status	
	6.4.10.	+FHNG:, Call Termination with Status	
	6.4.11.	+FCIG:, Report the Polled Station ID	
	6.4.12.	+FDTC:, Report the Polled Station Capabilities	
	6.4.13.	+FPOLL, Indicate Polling Request	
	6.5.	SERVICE CLASS 2 PARAMETERS	
		Figure 6-1.	T.30 Session Parameter Relationships	
	6.5.1.	+FDCC, DCE Capabilities Parameters	
	6.5.2.	+FDIS, Current Sessions Capabilities Parameters	
	6.5.3.	+FDCS, Current Session Results Parameters	
	6.5.4.	+FLID=, Local ID String	
	6.5.5.	+FCR, Capability to Receive	
	6.5.6.	+FPTS=, Page Transfer Status	
	6.5.7.	+FCQ, Copy Quality Checking	
	6.5.8.	+FPHCTO, DTE Phase C Response Time-out	
	6.5.9.	+FAXERR, T.30 Session Error Report	
	6.5.10.	+FBOR, Data Bit Order	
	6.5.11.	+FAA, Answer Parameter	
	6.5.12.	+FBUF?, Buffer Size	
	6.6.	EXAMPLE SESSIONS	
		Table 6-6.	Send Two Pages, 1-D, No Errors	
		Table 6-7.	Receive Two Pages, 1-D Data, No Errors	
7.	VOICE/AUDIO COMMANDS	
	7.1.	VOICE/AUDIO SUBMODES	
	7.1.1.	Online Voice Command Mode	
	7.1.2.	Voice Receive Mode	
	7.1.3.	Voice Transmit Mode	
	7.2.	VOICE/AUDIO CAPABILITIES	
	7.2.1.	Call Establishment - Originate	
		Directed Originate (Dial as a specific modem type)	
		Voice/Audio	
		Fax	
		Data	
		Adaptive Originate (Dial with Voice/Data/Fax Discrimination)	
	7.2.2.	Call Establishment - Answer	
		Directed Answer (Answer as a specific modem type)	
		Voice/Audio	
		Fax	
		Data	
		Adaptive Answer (Answer with Voice/Data/Fax Discrimination)	
		Data/Fax Discrimination	
		Voice/Fax Discrimination	
		Voice/Data/Fax Discrimination	
	7.2.3.	Voice/Audio Data Transfer	
		Table 7-1a.	7.2 kHz Sample Rate DTE Speeds	
		Table 7-1b.	11.025 kHz Sample Rate DTE Speed	
	7.2.4.	Tone and Status Monitoring Ñ Shielded <DLE> Statuses	
		Table 7-2.	Shielded Codes Sent to the DTE	
	7.2.5.	Shielded <DLE> Commands from the DTE	
		Table 7-3.	Shielded DTE Codes	
	7.2.6.	Voice Record	
	7.2.7.	Voice Playback	
		Volume Adjustment During Record	
		Volume Adjustment During Playback	
	7.2.8.	Voice Call Termination	
		Local Disconnect	
		Remote Disconnect Detection	
	7.2.9.	Mode Switching	
		Voice to Fax	
		Unsuccessful Fax Connection Attempt to Voice	
		Voice to Data	
		Unsuccessful Data Connection Attempt to Voice	
	7.2.10.	Caller ID	
	7.3.	AT VOICE COMMAND SUMMARY	
		Table 7-4.	AT Voice Commands	
	7.3.1.	Global AT Command Set Extensions	
		ATA - Answering in Voice/Audio	
		ATD - Dial Command in Voice/Audio	
		ATH - Hang Up in Voice/Audio	
		ATZ - Reset from Voice Mode	
		#BDR - Select Baud Rate (Turn off Autobaud)	
		#CID - Enable Caller ID Detection and Select Reporting Format	
		#CLS - Select Data, Fax, or Voice/Audio	
		#MDL? - Identify Model	
		#MFR? - Identify Manufacturer	
		#REV? - Identify Revision Level	
		7.3.2.	AT#V Commands Enabled Only in Voice Mode (#CLS=8)	
		#TL- Audio Output Transmit Level	
		#VBQ? - Query Buffer Size	
		#VBS - Bits Per Sample	
		#VBT - Beep Tone Timer	
		#VCI? - Identify Compression Method	
		#VLS - Voice Line Select	
		Table 7-5.	Device Types Supported by #VLS	
		#VRA - Ringback Goes Away Timer (Originate)	
		#VRN - Ringback Never Came Timer (Originate)	
		#VRX - Voice Receive	
		#VSD - Enable Silence Deletion (Voice Receive) [ADPCM]	
		#VSK - Buffer Skid Setting	
		#VSP - Silence Detection Period (Voice Receive) [ADPCM]	
		#VSR - Sampling Rate Selection	
		#VSS - Silence Detection Tuner (Voice Receive) [ADPCM]	
		#VTD - DTMF Tone Reporting	
		Table 7-6.	#VTD Tone Detection/Reporting Bit Settings	
		#VTM - Enable Timing Mark Placement	
		#VTS - Generate Tone Signals (Online Voice Command)	
		#VTX - Voice Transmit	
		#VGT - Set Playback Volume in the Command State	
		<DLE><u> and <DLE><d> - Set Playback Volume in the Data State	
	7.3.3.	Speakerphone Commands	
		Originating a Call in Speakerphone Mode	
		Answering a Call in Speakerphone Mode	
		Muting the Local Handset During Phone Conversation - Music on Hold	
		Recording a Handset Conversation on the Phone Line	
		Recording/Playback from Handset through Sound Chip	
		#SPK Parameter	
		Room Monitor	
		Switching Between #VLS Settings:	
		Example 1:	
		Example 2:	
		Reporting of Local Handset Status	
	7.3.4.	Using VoiceView with Speakerphone, Headset, and Handset modes	
		Example 3	
		Example 4	
		Using Modem as Dialer Prior to VoiceView Mode	
		Example 5	
	7.4.	S-REGISTERS	
		S30 - Disconnect Inactivity Timer	
	7.5.	RESULT CODES FOR VOICE OPERATION	
	7.6.	EXAMPLES OF VOICE OPERATION	
		Table 7-7.	Record a Greeting Message	
		Table 7-8.	Playback a Greeting Message	
		Table 7-9.	Answer Call/Play Greeting/Record Message	
		Table 7-10.	Answer Call/Record Message/Receive Fax	
		Table 7-11.	Answer Call, Determine It's a Fax	
		Table 7-12.	Adaptive Fax/Data/Voice	
		Table 7-13.	Originate a Call, Send Answerer a Message	
A.	AT COMMAND SET SUMMARY	
	A.1.	BASIC AT COMMANDS	
	A.2.	ECC COMMANDS	
	A.3.	MNP 10 COMMANDS	
	A.4.	W-CLASS COMMANDS	
	A.5.	CALLER ID COMMANDS	
	A.6.	FAX CLASS 1	
	A.7.	FAX CLASS 2	
	A.8.	VOICE/AUDIO COMMANDS	
	A.9.	CELLULAR COMMANDS	
B.	COMMON CONFIGURATION SETUP STRINGS	

List of Tables
	Table 3-1.	Result Codes
	Table 4-1.	S-Register Summary
	Table 5-1.	Fax Class 1 Commands
	Table 5-2.	Fax Class 1 Calling Sequence (One Page)
	Table 5-3.	Fax Class 1 Answering Sequence (One Page)
	Table 6-1.	Fax Class 2 Commands
	Table 6-2.	T.30 Session Subparameter Codes
	Table 6-3.	T.30 Post Page Message Codes
	Table 6-4.	T.30 Post Page Response Messages
	Table 6-5.	Hang Up Status Codes
	Table 6-6.	Send Two Pages, 1-D, No Errors
	Table 6-7.	Receive Two Pages, 1-D Data, No Errors
	Table 7-1a.	7.2 kHz Sample Rate DTE Speeds
	Table 7-1b.	11.025 kHz Sample Rate DTE Speed
	Table 7-2.	Shielded Codes Sent to the DTE
	Table 7-3.	Shielded DTE Codes
	Table 7-4.	AT Voice Commands
	Table 7-5.	Device Types Supported by #VLS
	Table 7-6.	#VTD Tone Detection/Reporting Bit Settings
	Table 7-7.	Record a Greeting Message
	Table 7-8.	Playback a Greeting Message
	Table 7-9.	Answer Call/Play Greeting/Record Message
	Table 7-10.	Answer Call/Record Message/Receive Fax
	Table 7-11.	Answer Call, Determine It's a Fax
	Table 7-12.	Adaptive Fax/Data/Voice
	Table 7-13.	Originate a Call, Send Answerer a Message

List of Figures
	Figure 6-1.	T.30 Session Parameter Relationships



1.	INTRODUCTION
1.1.	OVERVIEW
This manual describes the AT commands for the following Rockwell modem
families:
	RC288ACi 
	RC288ACL
The descriptions apply to all these modems with any differences between
modem product families noted. Refer to MCU FIrmware Release notes for the
exact applicable commands to modem firmware.
Voice/Audio Mode operation in business audio products require use of the
Proprietary Rockwell High Speed Interface (RHSI) included in the modem MCU
firmware and use of an RHSI compatible communication software driver
(RHSICOMM.DRV) in the host computer when operating in the Microsoft
Windows environment.
1.1.1.	Command Syntax
The fundamental DTE interface command syntax is described in Section 2.
1.1.2.	Command Descriptions
These commands are grouped into the following categories:
	AT commands	Section 3
	S-Registers	Section 4
	Fax Class 1 commands	Section 5
	Fax Class 2 commands	Section 6
	Voice/Audio commands	Section 7
The AT commands are implemented in microcontroller (MCU) firmware for
specific modem models. The support for a command category is identified by
modem model in the modem designer's guide. Additional configuration and
implementation information is available in release notes and/or readme
files that accompany MCU firmware release.
1.1.3.	Call Progress and Blacklisting Parameters
The modem MCU firmware may be provided either in reconfigurable form or
preconfigured form. Consult the specific firmware release notes for exact
configuration information.
Reconfigurable Form. The modem MCU firmware can be configured for
operation in specific countries by the PC-compatible ConfigurACE II
program. The call progress and blacklisting parameters described in the
ConfigurACE II User's Manual can be altered and loaded for a number of
countries by this program. 
Preconfigured Form. Specific MCU firmware configurations may be released
that can be directly installed without requiring the use of ConfigurACE
II.
1.1.4.	ConfigurACE II
The ConfigurACE II User's Manual describes the use of ConfigurACE II and
the country modifiable parameters. Consult any readme files accompanying
the ConfigurACEÊII program for additional or later information.

1.2.	REFERENCE DOCUMENTATION
	Order No.	Description
	MD127	RC288ACi and RC288ACL Modem Data Sheet

	1027	RC288ACi and RC288ACL Modem Designer's Guide

	893	ConfigurACE II User's Manual


2.	COMMAND SYNTAX
2.1.	DTE/DCE INTERCHANGE CIRCUITS
Communication between the DTE and modem is half duplex (i.e., only one
entity 'talks' at a time).
2.2.	COMMAND SYNTAX AND GUIDELINES
2.2.1.	DTE Commands
The ISO 646 character set (CCITT T.50 International Alphabet 5, American
Standard Code for Information Interchange) is used for the issuance of
commands and responses. Only the low-order 7 bits of each character are
used for commands or parameters; the high-order bit is ignored. Upper case
characters are equivalent to lower case characters.
2.2.2.	DTE Command Lines
A command line is a string of characters sent from a DTE to the DCE while
the DCE is in a command state. Command lines have a prefix, a body, and a
terminator. The prefix consists of the ASCII characters ÒATÓ (065, 084) or
ÒatÓ (097, 116). The body is a string of commands restricted to printable
ASCII characters (032 - 126). Space characters (ASCII 032) and control
characters other than carriage return <CR> (default value = ASCII 013 =
0Dh, see register S3), backspace <BS> (default value = ASCII 008 = 08h,
see register S5), and cancel <cntrl-x> (ASCII 024 = 18h) in the command
string are ignored. The default terminator is the <CR> character.
Characters that precede the AT prefix are ignored.
2.3.	AT COMMAND GUIDELINES
Modem operation is controlled by generic AT commands. These AT commands
may be basic AT (i.e., commands preceded by AT, AT&, AT%, AT*, AT\, AT),
AT-, or AT#), S-Register (e.g., S6=n), Fax class 1 (e.g., +FTM), Fax class
2 (e.g., +FDCS:), or voice (e.g., #VBS) commands. The command syntax and
operation guidelines governing each of these command categories are
described in subsequent sections.
2.3.1.	Basic Command Syntax
Characters within the command line are parsed as commands with associated
parameter values. The basic commands consist of single ASCII characters,
or single characters preceded by a prefix character, followed by a decimal
parameter (e.g., Ò&D1"). Missing decimal parameters are evaluated as 0. 
2.3.2.	Extended Command Syntax
The facsimile commands use extended syntax. They are preceded by the Ò+FÓ
characters, and they are terminated by the semicolon Ò:Ó character (ASCII
059) or by the <CR> that terminates the command line.

This page is intentionally blank.

3.	AT COMMAND SET
3.1.	AT COMMAND GUIDELINES
The basic AT commands used to control modem operation are defined in this
section. These commands are summarized in Appendix A. All these commands
may not be available in a specific product depending upon supported data
rates and modes. The default values are typical of a fully configured
modem supporting all data rates and options. The actual default value is
dependent upon modem firmware as defined by the firmware release notes. 
3.1.1.	AT Commands, DTE Adaption
Under AT operation, the serial interfaced modem performs an
autobaud/autoparity/autolength function on each AT header entered. The
autolength/autoparity facility can detect 7- or 8-bit characters of even,
odd, or no parity with one stop bit. This is not necessary for the
parallel interfaced modem since it has direct access to the UART
registers.
3.1.2.	AT Command Format
A command line is a string of characters sent from a DTE to the modem
(DCE) while the modem is in a command state. A command line has a prefix,
a body, and a terminator. Each command line (with the exception of the A/
command) must begin with the character sequence AT and must be terminated
by a carriage return. Commands entered in upper case or lower case are
accepted, but both the A and T must be of the same case, i.e., "AT" =
ASCII 065, 084 or ÒatÓ = ASCII 097, 116. The body is a string of commands
restricted to printable ASCII characters (032 - 126). Space characters
(ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII
010) in the command string are ignored. The default terminator is the
ASCII <CR> character. Characters that precede the AT prefix are ignored.
The command line interpretation begins upon receipt of the carriage return
character.
Characters within the command line are parsed as commands with associated
parameter values. The basic commands consist of single ASCII characters,
or single characters preceded by a prefix character (e.g., Ò&"), followed
by a decimal parameter. Missing decimal parameters are evaluated as 0. 
The modem supports the editing of command lines by recognizing a backspace
character. When modem echo is enabled, the modem responds to receipt of a
backspace or delete by echoing a backspace character, a space character,
and another backspace. The hex value to be used for the backspace
character is programmable through register S5. Values equal to 0 or
greater than 127, or the value which corresponds to the carriage return
character, cannot be used for the backspace character. This editing is not
applicable to the AT header of a command. A command line may be aborted at
any time by entering < cntrl-x > (18h).
The AT sequence may be followed by any number of commands in sequence,
except for commands such as Z, D, or A. Commands following commands Z, D,
or A on the same command line will be ignored. The maximum number of
characters on any command line is 39 (including "A" and "T"). If a syntax
error is found anywhere in a command line command, the remainder of the
line will be ignored and the ERROR result code will be returned.
Most commands entered with parameters out of range will not be accepted
and the ERROR response will be returned to the DTE.
Commands will only be accepted by the modem once the previous command has
been fully executed, which is normally indicated by the return of an
appropriate result code. Execution of commands D and A, either as a result
of a direct command or a re-execute command, will be aborted if another
character is entered before completion of the handshake.
3.1.3.	Escape Code Sequence
When the modem has established a connection and has entered on-line data
mode, it is possible to break into the data transmission in order to issue
further commands to the modem in an on-line command mode. This is achieved
by the DTE sending to the modem a sequence of three ASCII characters
specified by register S2. The default character is '+'. The maximum time
allowed between receipt of the last character of the three escape
character sequence from the DTE and sending of the OK result code to the
DTE is controlled by the S12 register.


3.2.	AT COMMAND SET
The modem will respond to the commands detailed below. Parameters
applicable to each command are listed with the command description. The
defaults shown for each configuration command are those used in the
Rockwell factory profileÊ0.
3.2.1.	AT Commands
A/ - Re-execute Command
The modem behaves as though the last command line had been re-sent by the
DTE. "A/" will repeat all the commands in the command buffer.
The principal application of this command is to place another call (using
the Dial command) that failed to connect due to a busy line, no answer, or
a wrong number. This command must appear alone on a command line. This
command should not be terminated by a carriage return.
AT= x - Write to Selected S-Register
This command writes the value x to the currently selected S-Register. An
S-Register can be selected by using the ATSn command. All of the
S-Registers will return the OK response if x is a number. Some registers
may not be written due to country specific PTT limitations.
Result Codes
OK	For all arguments.
AT? - Read Selected S-Register
This command reads and displays the selected S-Register. An S-Register can
be selected by using the ATSn command.
Result Codes:
OK	For all arguments.
A - Answer
The modem will go off-hook and attempt to answer an incoming call if
correct conditions are met. Upon successful completion of answer
handshake, the modem will go on-line in answer mode. This command may be
affected by the state of Line Current Sense, if enabled. (Most countries
do not require Line Current Sense.) Operation is also dependent upon
+FCLASS command and country-specific requirements.
If +FCLASS=0 is selected, the modem will enter the connect state after
exchanging carrier with the remote modem. If no carrier is detected within
a period specified in register S7, the modem hangs up. Any character
entered during the connect sequence will abort the connection attempt.
If +FCLASS=1 or 2 is selected, the modem will go off-hook in V.21 answer
mode. It will generate the V.21 2100 Hz answer tone for 3 ± 0.5 seconds
and, following a delay of 70 ms, will proceed as if the +FTH=3 command
were issued. At any stage up to (but excluding) the +FTH=3 command state,
any character will abort the communication. (See the description of the
+FTH command for details.)
Bn - CCITT or Bell
When the modem is configured to allow either option, the modem will select
Bell or CCITT modulation for a line speed connection of 300 or 1200 bps
according to the parameter supplied. Any other line speed will use a CCITT
modulation standard. The parameter value, if valid, is written to S27 bit
6. (Also, see ATFn command.)
B0	Selects CCITT operation at 300 or 1200 bps during Call Establishment
and a subsequent connection. (Default for W-class models.)
B1	Selects BELL operation at 300 or 1200 bps during Call Establishment
and a subsequent connection. (Default for US models.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.

Cn - Carrier Control
This command is included for compatibility only, and has no effect other
than returning a result code. The only valid parameter is 1.
Result Codes:
OK	n = 1.
ERROR	Otherwise.
Dn - Dial
This command directs the modem to go on-line, dial according to the string
entered and attempt to establish a connection. If no dial string is
supplied, the modem will go on-line and attempt the handshake in originate
mode. In W-class models, the action of going off-hook is affected by the
status of the Line Current Sense input, if line current sensing is
enabled, and by the blacklist and delayed list. NOTE: If the ATD command
is issued before the S1 register has cleared, the modem will respond with
the NO CARRIER result code.
If +FCLASS=0 is selected, the modem will behave as a data modem and will
attempt to connect to another data modem. The modem will have up to the
period of time specified by register S6 or S7 to wait for carrier and
complete the handshake. If this time expires before the modem can complete
the handshake, the modem will go on-hook with the NO CARRIER response.
This command will be aborted in progress upon receipt of any DTE character
before completion of the handshake.
If +FCLASS=1 or 2 is selected, the modem will behave as a facsimile modem
and attempt to connect to a facsimile machine (or modem) by entering the
HDLC V.21 channel 2 receive state (as if +FRH=3 had been issued). This
command will be aborted upon receipt of any DTE character if the modem has
not finished dialing. In this case, the modem will go on-hook and return
to command mode after displaying the NO CARRIER message. If the modem has
finished dialing, it proceeds as if the +FRH=3 command has been issued.
(Refer to the +FRH command to determine how the modem behaves following
this stage.)
Dial Modifiers. The valid dial string parameters are described below.
Punctuation characters may be used for clarity, with parentheses, hyphen,
and spaces being ignored.
0-9	DTMF digits 0 to 9.
*	The 'star' digit (tone dialing only).
#	The 'gate' digit (tone dialing only).
A-D	DTMF digits A, B, C, and D. Some countries may prohibit sending of
these digits during dialing.
J	Perform MNP 10 link negotiation at 1200 bps (for this call only). (See
*H.)
K	Enable power level adjustment during MNP 10 link negotiation (for this
call only). (See )Mn.)
L	Re-dial last number: the modem will re-dial the last valid telephone
number. The L must be immediately after the D with all the following
characters ignored).
P	Select pulse dialing: pulse dial the numbers that follow until a "T"
is encountered. Affects current and subsequent dialing. Some countries
prevent changing dialing modes after the first digit is dialed.
T	Select tone dialing: tone dial the numbers that follow until a "P" is
encountered. Affects current and subsequent dialing. Some countries
prevent changing dialing modes after the first digit is dialed.
R	This command will be accepted, but not acted on.
S=n	Dial the number stored in the directory (n = 0 to 3). (See &Z.)
!	Flash: the modem will go on-hook for a time defined by the value of
S29. Country requirements may limit the time imposed.
W	Wait for dial tone: the modem will wait for dial tone before dialing
the digits following "W". If dial tone is not detected within the time
specified by S7 (US) or S6 (W-class), the modem will abort the rest of the
sequence, return on-hook, and generate an error message.

@	Wait for silence: the modem will wait for at least 5 seconds of silence
in the call progress frequency band before continuing with the next dial
string parameter. If the modem does not detect these 5 seconds of silence
before the expiration of the call abort timer (S7), the modem will
terminate the call attempt with a NO ANSWER message. If busy detection is
enabled, the modem may terminate the call with the BUSY result code. If
answer tone arrives during execution of this parameter, the modem
handshakes.
&	Wait for credit card dialing tone before continuing with the dial
string. If the tone is not detected within the time specified by S7 (US
models) or S6 (W-class models), the modem will abort the rest of the
sequence, return on-hook, and generate an error message.
,	Dial pause: the modem will pause for a time specified by S8 before
dialing the digits following ",".
;	Return to command state. Added to the end of a dial string, this causes
the modem to return to the command state after it processes the portion of
the dial string preceding the ";". This allows the user to issue
additional AT commands while remaining off-hook. The additional AT
commands may be placed in the original command line following the ";"
and/or may be entered on subsequent command lines. The modem will enter
call progress only after an additional dial command is issued without the
";" terminator. Use "H" to abort the dial in progress, and go back
on-hook.
^	Toggles calling tone enable/disable: applicable to current dial attempt
only.
( )	Ignored: may be used to format the dial string.
-	Ignored: may be used to format the dial string.
<space>	Ignored: may be used to format the dial string.
<i>	Invalid character: will be ignored.
>	If enabled by country specific parameter, the modem will generate a
grounding pulse on the EARTH relay output.
En - Command Echo
The modem enables or disables the echo of characters to the DTE according
to the parameter supplied. The parameter value, if valid, is written to
S14 bit 1.
E0	Disables command echo.
E1	Enables command echo. (Default.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.

Hn - Disconnect (Hang-Up)
This command initiates a hang up sequence.
This command may not be available for some countries due to PTT
restrictions.
H0	The modem will release the line if the modem is currently on-line, and
will terminate any test (AT&T) that is in progress. Country specific,
modulation specific, and error correction protocol specific (S38)
processing is handled outside of the H0 command.
H1	If on-hook, the modem will go off-hook and enter command mode. For
US models, the modem will remain off-hook. For W-class models, the modem
will return on-hook after a period of time determined by S7.
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
In - Identification
The modem reports to the DTE the requested result according to the command
parameter.
I0	Reports product code. Example: 28800
I1	Calculates the ROM checksum and reports the least significant byte
of the checksum in decimal (see firmware release notes). Reports 255 if
the prestored checksum value is FFh.
I2	Calculates the ROM checksum and compares it with the prestored
checksum. Reports "OK" if the calculated checksum equals the prestored
checksum or if the prestored checksum value is FFh; otherwise reports
ÒERRORÓ.
I3	Reports the firmware version (F), basic model (V34), application code
(A), and interface type code (I) in the form VF.FFF-V34_AI. The
application codes are: D = Desktop, L = Low Power (PCMCIA). The interface
type codes are: S = Serial, P = Parallel. Example: V1.200-V34_DS
I4	Reports OEM defined identifier string in either Hayes-compatible
binary format (default) or ASCII format (selectable by ConfigurACE).
Example: RC288ACi (ASCII)
I5	Reports Country Code parameter. Example: 022
I6	Reports modem data pump model and internal code revision. Example:
RC288DPi Rev 05BA
I7	Reports the DAA code resulting from MCU interrogation of the DAA for
auto DAA recognition. Examples: 000 for US or Canada, 016 for Japan, 033
for Belgium, 034 for Finland, 035 for France, 037 for Italy, 038 for
Netherlands, 039 for Sweden, 040 for Switzerland, and 041 for UK.
Result Codes:
OK	n = 0 to 7.
ERROR	Otherwise.
Ln - Speaker Volume
The modem sets the speaker volume control according to the parameter
supplied. The parameter value, if valid, is written to S22 bits 0 and 1.
L0	Low volume.
L1	Low volume. (Default.)
L2	Medium volume.
L3	High volume.
Result Codes:
OK	n = 0 to 3.
ERROR	Otherwise.

Mn - Speaker Control
This command selects when the speaker will be on or off. The parameter
value, if valid, is written to S22 bits 2 and 3.
M0	Speaker is always off.
M1	Speaker is on during call establishment, but off when receiving
carrier. (Default.)
M2	Speaker is always on.
M3	Speaker is off when receiving carrier and during dialing, but on
during answering.
Result Codes:
OK	n = 0 to 3.
ERROR	Otherwise.
Nn - Automode Enable
This command enables or disables automode detection. The parameter value,
if valid, is written to S31 bit 1.
N0	Automode detection is disabled (equivalent to setting the +MS
<automode> subparameter to 0). A subsequent handshake will be conducted
according to the contents of S37 or, if S37 is zero, according to the most
recently sensed DTE speed.
N1	Automode detection is enabled (equivalent to setting the +MS
<automode> subparameter to 1). A subsequent handshake will be conducted
according to the contents of S37 or, if S37 is zero, starting at 28800 bps
V.34. (Default.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
Notes: 
1.	The Nn and S37=x commands override the +MS command settings. When the
N0 or N1 command is issued, the +MS subparameters are updated to reflect
the Nn and S37 values (see +MS command and S37 register). For example:
N1S37=10 updates the +MS command subparameters to reflect
+MS=10,1,300,12000
N0S37=10 updates the +MS command subparameters to reflect
+MS=10,0,12000,12000
2.	Use of the +MS command is recommended instead of the Nn and S37=x
commands. Nn and S37=x commands are supported for compatibility with
existing communication software. 
On - Return to On-Line Data Mode
This command determines how the modem will enter the on-line data mode. If
the modem is in the on-line command mode, the enters the on-line data mode
with or without a retrain. If the modem is in the off-line command mode
(no connection), ERROR is reported.
O0	Enters on-line data mode without a retrain. Handling is determined
by the Call Establishment task. Generally, if a connection exists, this
command connects the DTE back to the remote modem after an escape (+++).
O1	Enters on-line data mode with a retrain before returning to on-line
data mode.
Result Codes:
OK	n = 0 or 1 and a connection exists.
ERROR	Otherwise or if not connected.

P - Set Pulse Dial Default
This command forces pulse dialing until the next T dial modifier or T
command is received. Sets S14 bit 5.
As soon as a dial command is executed which explicitly specifies the
dialing mode for that particular call (e.g., ATDT...), this command is
overridden so that all future dialing will be tone dialed. (See T
command.)
This command may not be permitted in some countries.
Result Code:
OK
Qn - Quiet Results Codes Control
The command enables or disables the sending of result codes to the DTE
according to the parameter supplied. The parameter value, if valid, is
written to S14 bit 2.
Q0	Enables result codes to the DTE. (Default.)
Q1	Disables result codes to the DTE.
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
Sn - Read/Write S-Register
The modem selects an S-Register, performs an S-Register read or write
function, or reports the value of an S-Register.
n	Establishes S-Register n as the last register accessed.
n=v	Sets S-Register n to the value v.
n?	Reports the value of S-Register n.
The parameter n can be omitted, in which case the last S-Register accessed
will be assumed. The S can be omitted for AT= and AT?, in which case the
last S-Register accessed will be assumed.
For example:
	ATS7 establishes S7 as the last accessed register.
	AT=40 sets the contents of the last register accessed to 40.
	ATS=20 sets the contents of the last register accessed to 20.
If the number "n" is beyond the range of the S-Registers available, the
modem will return the ERROR message. The value "v" is "MOD"ed with 256. If
the result is outside the range permitted for a given S-Register the
values will still be stored, but functionally the lower and higher limits
will be observed. Input and output are always in decimal format. Note that
some S-Registers are read-only.
In some cases, writing to the S-Register will appear to be accepted but
the value will not actually be written.
Due to country restrictions, some commands will be accepted, but the value
may be limited and replaced by a maximum or minimum value.
Minimum, maximum, and default values for S-Registers may be altered with
ConfigurACE.

T - Set Tone Dial Default
This command forces DTMF dialing until the next P dial modifier or P
command is received. The modem will set an S-Register bit to indicate that
all subsequent dialing should be conducted in tone mode. Note that the DP
command will override this command. Clears S14 bit 5.
This command may not be permitted in some countries. (See P.)
Result Code:
OK
Vn - Result Code Form
This command selects the sending of short-form or long-form result codes
to the DTE. The parameter, if valid, is written to S14 bit 3.
V0	Enables short-form (terse) result codes. Line feed is not issued
before a short-form result code.
V1	Enables long-form (verbose) result codes. (Default.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
Wn - Connect Message Control
This command controls the format of CONNECT messages. The parameter value,
if valid, is written to S31 bits 2 and 3. Note that the Wn command can be
overridden by register S95 bits (see S95 description).
W0	Upon connection, the modem reports only the DTE speed (e.g., CONNECT
57600). Subsequent responses are disabled. (Default.)
W1	Upon connection, the modem reports the line speed, the error
correction protocol, and the DTE speed, respectively. Subsequent responses
are disabled.
W2	Upon connection, the modem reports the DCE speed (e.g., CONNECT
28800). Subsequent responses are disabled.
Result Codes:
OK	n = 0, 1, or 2.
ERROR	Otherwise.

Xn - Extended Result Codes:
This command selects which subset of the result messages will be used by
the modem to inform the DTE of the results of commands.
Blind dialing is enabled or disabled by country parameters. If the user
wishes to enforce dial tone detection, a "W" can be placed in the dial
string (see D command). Note that the information below is based upon the
default implementation of the X results table. Table 3-1 indicates the
messages which are enabled for each X value.
If the modem is in facsimile mode (+FCLASS=1 or 2), the only message sent
to indicate a connection is CONNECT without a speed indication.
X0	Disables monitoring of busy tones unless forced otherwise by country
requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, and NO
ANSWER result codes. Blind dialing is enabled/disabled by country
parameters. If busy tone detection is enforced and busy tone is detected,
NO CARRIER will be reported. If dial tone detection is enforced or
selected and dial tone is not detected, NO CARRIER will be reported
instead of NO DIAL TONE. The value 000b is written to S22 bits 6, 5, and
4, respectively.
X1	Disables monitoring of busy tones unless forced otherwise by country
requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO ANSWER,
and CONNECT XXXX (XXXX = rate). Blind dialing enabled/disabled by country
parameters. If busy tone detection is enforced and busy tone is detected,
NO CARRIER will be reported instead of BUSY. If dial tone detection is
enforced or selected and dial tone is not detected, NO CARRIER will be
reported instead of NO DIAL TONE. The value 100b is written to S22 bits 6,
5, and 4, respectively.
X2	Disables monitoring of busy tones unless forced otherwise by country
requirements; send only OK, CONNECT, RING, NO CARRIER, ERROR, NO DIALTONE,
NO ANSWER, and CONNECT XXXX. If busy tone detection is enforced and busy
tone is detected, NO CARRIER will be reported instead of BUSY. If dial
tone detection is enforced or selected and dial tone is not detected, NO
DIAL TONE will be reported instead of NO CARRIER. The value 101b is
written to S22 bits 6, 5, and 4, respectively.
X3	Enables monitoring of busy tones; send only OK, CONNECT, RING, NO
CARRIER, ERROR, NO ANSWER, and CONNECT XXXX. Blind dialing is
enabled/disabled by country parameters. If dial tone detection is enforced
and dial tone is not detected, NO CARRIER will be reported. The value 110b
is written to S22 bits 6, 5, and 4, respectively.
X4	Enables monitoring of busy tones; send all messages. The value 111b
is written to S22 bits 6, 5, and 4, respectively. (Default.)
Result Codes:
OK	n = 0 to 4.
ERROR	Otherwise.

Table 3-1.	Result Codes
Short Form	Long Form	n Value in ATXn Command				
		0	1	2	3	4
0	OK	x	x	x 	x 	x 
1	CONNECT	x	x 	x 	x	x
2	RING 	x	x 	x 	x	x
3	NO CARRIER 	x	x 	x 	x	x
4	ERROR	x	x 	x 	x	x
5	CONNECT 1200 	1	x	x	x	x
6	NO DIALTONE 	3	3 	x 	x 	x
7	BUSY 	3	3	3	x	x
8	NO ANSWER 	x 	x	x 	x	x
9	CONNECT 0600 	1 	x	x	x	x
10	CONNECT 2400 	1	x	x	x	x
11	CONNECT 4800	1	x	x	x	x
12	CONNECT 9600	1	x	x	x	x
13	CONNECT 7200	1	x	x	x	x
14	CONNECT 12000	1	x	x	x	x
15	CONNECT 14400	1	x	x	x	x
16	CONNECT 19200	1	x	x	x	x
17	CONNECT 38400	1	x	x	x	x
18	CONNECT 57600	1	x	x	x	x
19	CONNECT 115200	1	x	x	x	x
22	CONNECT 75TX/1200RX	1	x	x	x	x
23	CONNECT 1200TX/75RX	1	x	x	x	x
24	DELAYED	4	4	4	4	x
32	BLACKLISTED	4	4	4	4	x
33	FAX	x	x	x 	x	x 
35	DATA	x	x	x 	x	x 
40	CARRIER 300	x	x	x 	x	x
44	CARRIER 1200/75	x	x	x 	x	x
45	CARRIER 75/1200	x	x	x 	x	x
46	CARRIER 1200	x	x	x 	x	x
47	CARRIER 2400	x	x	x 	x	x
48	CARRIER 4800	x	x	x 	x	x
49	CARRIER 7200	x	x	x 	x	x
50	CARRIER 9600	x	x	x 	x	x
51	CARRIER 12000	x	x	x 	x	x
52	CARRIER 14400	x	x	x 	x	x
53	CARRIER 16800	x	x	x 	x	x
54	CARRIER 19200	x	x	x 	x	x
55	CARRIER 21600	x	x	x 	x	x
56	CARRIER 24000	x	x	x 	x	x
57	CARRIER 26400	x	x	x 	x	x
58	CARRIER 28800	x	x	x 	x	x
59	CONNECT 16800	1	x	x	x	x
61	CONNECT 21600	1	x	x	x	x
62	CONNECT 24000	1	x	x	x	x

Table 3-1.	Result Codes (Cont'd)
Short Form	Long Form	n Value in ATXn Command				
		0	1	2	3	4
63	CONNECT 26400	1	x	x	x	x
64	CONNECT 28800	1	x	x	x	x
66	COMPRESSION: CLASS 5	x	x	x 	x	x
67	COMPRESSION: V.42 bis	x	x	x 	x	x
69	COMPRESSION: NONE	x	x	x 	x	x
76	PROTOCOL: NONE	x	x	x 	x	x
77	PROTOCOL: LAPM	x	x	x 	x	x
80	PROTOCOL: ALT	x	x	x 	x	x
81	PROTOCOL: ALT-CELLULAR	x	x	x 	x	x
+F4	+FCERROR	x	x	x 	x	x
Note: An 'x' in a column indicates that the message (either the long form
if verbose, or the value only for short form) will be generated when that
particular value of 'n' (shown at the top of the column) has been selected
by the use of ATXn. If the column is blank, then no message will be
generated for that x option. A numeral indicates which less explicit
message (verbose or short form) will be output for that X option. (Also,
see Section 3.3).						
Yn - Long Space Disconnect
This command enables/disables the generation and response to long space
disconnect. The parameter value, if valid, is written to S21 bit 7.
Y0	Disables long space disconnect. (default.)
Y1	Enables long space disconnect. In non-error correction mode, the modem
will send a long space of four seconds prior to going on-hook. In error
correction mode, the modem will respond to the receipt of a long space
(i.e., a break signal greater than 1.6 seconds) by going on-hook.
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
Zn - Soft Reset and Restore Profile
The modem performs a soft reset and restores (recalls) the configuration
profile according to the parameter supplied. If no parameter is specified,
zero is assumed.
Z0	Soft reset and restore stored profile 0.
Z1	Soft reset and restore stored profile 1.
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.

3.2.2.	AT& Commands
&Cn - RLSD (DCD) Option
The modem controls the RLSD output in accordance with the parameter
supplied. The parameter value, if valid, is written to S21 bit 5.
&C0	RLSD remains ON at all times. 
&C1	RLSD follows the state of the carrier. (Default.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
&Dn - DTR Option
This command interprets the ON to OFF transition of the DTR signal from
the DTE in accordance with the parameter supplied. The parameter value, if
valid, is written to S21 bits 3 and 4. Also, see S25.
&D0 -	DTR drop is interpreted according to the current &Qn setting as
follows:
&Q0, &Q5, &Q6	DTR is ignored (assumed ON). Allows operation with DTEs
which do not provide DTR.
&Q1, &Q4	DTR drop causes the modem to hang up. Auto-answer is not
affected.
&Q2, &Q3	DTR drop causes the modem to hang up. Auto-answer is
inhibited.
&D1	DTR drop is interpreted according to the current &Qn setting as
follows:
&Q0, &Q1, &Q4, &Q5, &Q6	DTR drop is interpreted by the modem as if the
asynchronous escape sequence had been entered. The modem returns to
asynchronous command state without disconnecting.
&Q2, &Q3	DTR drop causes the modem to hang up. Auto-answer is
inhibited.
&D2	DTR drop is interpreted according to the current &Qn setting as
follows:
&Q0 through &Q6	DTR drop causes the modem to hang up. Auto-answer is
inhibited. (Default.)
&D3	DTR drop is interpreted according to the current &Qn setting as
follows:
&Q0, &Q1, &Q4, &Q5, &Q6	DTR drop causes the modem to perform a soft reset
as if the Z command were received. The &Y setting determines which profile
is loaded.
&Q2, &Q3	DTR drop causes the modem to hang up. Auto-answer is
inhibited.
If &Q5, &Q6, +FCLASS=1 or +FCLASS=2 is in effect, the action taken is the
same as for &Q0.
&Fn - Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile). The factory
defaults are identified for each command and in the S-Register
descriptions. A configuration (profile) consists of a subset of
S-Registers.
&F0	Restore factory configuration 0.
&F1	Restore factory configuration 1.
Result Codes:
OK	
ERROR	If the modem is connected.

&Gn - Select Guard Tone
The modem generates the guard tone selected by this command according to
the parameter supplied (DPSK modulation modes only). The parameter value,
if valid, is written to S23 bits 6 and 7.
&G0	Disables guard tone. (Default for US models.)
&G1	Disables guard tone.
&G2	Selects 1800 Hz guard tone. (Default for W-class models.)
This command may not be permitted in some countries.
Result Codes:
OK	n = 0 to 2.
ERROR	Otherwise.
&Jn - Telephone Jack Control
This command is only included for compatibility and performs no function
except to load the S-Register. The parameter value, if valid, is written
S21 bit 1.
&J0	&J0 command. (Default.)
&J1	&J1 command.
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
&Kn - Flow Control
This command defines the DTE/DCE (terminal/modem) flow control mechanism.
The parameter value, if valid, is written to S39 bits 0, 1, and 2.
&K0	Disables flow control.
&K3	Enables RTS/CTS flow control. (Default for data modem modes.)
&K4	Enables XON/XOFF flow control.
&K5 	Enables transparent XON/XOFF flow control.
&K6 	Enables both RTS/CTS and XON/XOFF flow control. (Default for fax
modem and voice modes.)
Result Codes:
OK	n = 0, 3, 4, 5, or 6.
ERROR	Otherwise.
&Ln - Leased Line Operation
This command requests leased line or dial-up operation. This command is
provided for compatibility only; no mode change is performed, dial-up
operation continues. The OK response is returned for a valid parameter,
but no other action is performed. The parameter value, if valid, is
written to S27 bit 2.
&L0	Requests dial-up operation. Dial-up operation continues.
Result Codes:
OK	n = 0.
ERROR	Otherwise.

&Mn - Asynchronous/Synchronous Mode Selection
This command determines the DTR operating mode. The modem treats the &M
command as a subset of the &Q command.
&M0	Selects direct asynchronous operation. Note that the command sequence
&M0\N0 selects normal buffered mode, but the command sequence \N0&M0
selects direct mode. This is because the \N0 command is analogous to the
&Q6 command. The value 000b is written to S27 bits 3, 1, and 0,
respectively. (See &Q).
&M1	Selects synchronous connect mode with async off-line command mode.
The value 001b is written to S27 bits 3, 1, and 0, respectively. (Serial
interface operation only.)
&M2	Selects synchronous connect mode with async off-line command mode.
Same as &M1 except that &M2 enables DTR dialing of directory slot 0. The
modem will disconnect if DTR is OFF for more than the period in S25 (in
units of hundredths of a second): the data connection will be synchronous.
The value 010b is written to S27 bits 3, 1, and 0, respectively. (Serial
interface operation only.)
&M3	Selects synchronous connect mode. This mode allows DTR to act as a
talk/data switch. The call is manually initiated while DTR is inactive.
When DTR becomes active, the handshake proceeds in originate or answer
mode according to S14 bit 7. The value 011b is written to S27 bits 3, 1,
and 0, respectively. (Serial interface operation only.)
Result Codes:
OK	n = 0 to 3.
ERROR	Otherwise.
&Pn - Select Pulse Dial Make/Break Ratio
This command determines the make/break ratio used during pulse dialing. It
is only effective if the appropriate bit to enable this command is set
through the ConfigurACE program. If enabled, it will override the
make/break ratios in the OEM parameters in ConfigurACE. The default is
country-dependent. The parameter value, if valid, is written to S28 bits 3
and 4.
&P0	Selects 39%-61% make/break ratio at 10 pulses per second.
(Default.)
&P1	Selects 33%-67% make/break ratio at 10 pulses per second.
&P2	Selects 39%-61% make/break ratio at 20 pulses per second.
&P3	Selects 33%-67% make/break ratio at 20 pulses per second.
Result Codes:
OK	n = 0 to 3.
ERROR	Otherwise.

&Qn - Sync/Async Mode
This command is an extension of the &M command and is used to control the
connection modes permitted. It is used in conjunction with S36 and S48.
(Also, see \N.) 
NOTE: When the &Q0 to &Q4 command is issued to select the mode, the
subsequent connect message will report the DCE speed regardless of the W
command and S95 settings.
&Q0	Selects direct asynchronous operation. The value 000b is written to
S27 bits 3, 1, and 0, respectively. See &M0.
&Q1	Selects synchronous connect mode with async off-line command mode.
The value 001b is written to S27 bits 3, 1, and 0, respectively. See &M1.
(Serial interface operation only.)
&Q2	Selects synchronous connect mode with async off-line command mode and
enables DTR dialing of directory 0. The value 010b is written to S27 bits
3, 1, and 0, respectively. See &M2. (Serial interface operation only.)
&Q3	Selects synchronous connect mode with async off-line command mode and
enables DTR to act as Talk/Data switch. The value 011b is written to S27
bits 3, 1, and 0, respectively. See &M3. (Serial interface operation
only.)
&Q4	Selects AutoSync operation. The value 100b is written to S27 bits
3, 1, and 0, respectively. 
	AutoSync operation, when used in conjunction with the Hayes Synchronous
Interface (HSI) capability in the DTE, provides synchronous communication
capability from an asynchronous terminal. 
	Starting AutoSync. Set registers S19, S20, and S25 to the desired values
before selecting AutoSync operation with &Q4. After the CONNECT message is
issued, the modem waits the period of time specified by S25 before
examining DTR. If DTR is on, the modem enters the synchronous operating
state; if DTR is off, the modem terminates the line connection and returns
to the asynchronous command state.
	Stopping AutoSync. AutoSync operation is stopped upon loss of carrier
or the on-to-off transition of DTR. Loss of carrier will cause the modem
to return to the asynchronous command state. An on-to-off transition of
DTR will cause the modem to return to the asynchronous command state and
either not terminate the line connection (&D1 active) or terminate the
line connection (any other &Dn command active).
&Q5	The modem will try to negotiate an error-corrected link. The modem
can be configured using S36 to determine whether a failure will result in
the modem returning on-hook or will result in fallback to an asynchronous
connection. The value 101b is written to S27 bits 3, 1, and 0,
respectively. (Default.)
&Q6	Selects asynchronous operation in normal mode (speed buffering). The
value 110b is written to S27 bits 3, 1, and 0, respectively.
Result Codes:
OK	n = 0 to 6.
ERROR	Otherwise.

&Rn - RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified if
hardware flow control is selected (see &K command). The parameter value,
if valid, is written to S21 bit 2.
&R0	In sync mode, CTS tracks the state of RTS; the RTS-to-CTS delay is
defined by S26. In async mode, CTS acts according to V.25 bis handshake. 
&R1	In sync mode, CTS is always ON (RTS transitions are ignored). In
async mode, CTS will only drop if required by flow control. (Default.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
&Sn - DSR Override
This command selects how the modem will control DSR. The parameter value,
if valid, is written to S21 bit 6.
&S0	DSR will remain ON at all times. (Default.)
&S1	DSR will become active after answer tone has been detected and
inactive after the carrier has been lost.
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
&Tn - Test and Diagnostics
The modem will perform selected test and diagnostic functions according to
the parameter supplied. A test can be run only when in an asynchronous
operation in non-error-correction mode (normal or direct mode). To
terminate a test in progress, the escape sequence must be entered first,
except for parameters 7 and 8 (see Section 3.1.3). If S18 is non-zero, a
test will terminate automatically after the time specified by S18 and
display the OK message.
&T0	Terminates test in progress. Clears S16.
&T1	Initiates local analog loopback, V.54 Loop 3. Sets S16 bit 0. If a
connection exists when this command is issued, the modem hangs up. The
CONNECT XXXX message is displayed upon the start of the test.
&T2	Returns ERROR.
&T3	Initiates local digital loopback, V.54 Loop 2. Sets S16 bit 2. If
no connection exists, ERROR is returned. Sets S16 bit 4 when the test is
in progress.
&T4	Enables digital loopback acknowledgment for remote request, i.e.,
an RDL request from a remote modem is allowed. Sets S23 bit 0. (Default.)
&T5	Disables digital loopback acknowledgment for remote request, i.e.,
an RDL request from a remote modem is denied. Clears S23 bit 0.
&T6	Requests a remote digital loopback (RDL), V.54 Loop 2, without self
test. If no connection exists, ERROR is returned. Sets S16 bit 4 when the
test is in progress. The CONNECT XXXX message is displayed upon the start
of the test.
&T7	Requests a remote digital loopback (RDL),V.54 Loop 2, with self test.
(In self test, a test pattern is looped back and checked by the modem.) If
no connection exists, ERROR is returned. When the test is terminated
either via expiration of S18, or via the &T0 or H command, the number of
detected errors is reported to the DTE. Sets S16 bit 5 when the test is in
progress.
&T8	Initiates local analog loopback, V.54 Loop 3, with self test. (In
self test, a test pattern is looped back and checked by the modem.) If a
connection exists, the modem hangs up before the test is initiated. When
the test is terminated either via expiration of S18, or via the &T0 or H
command, the number of detected errors is reported to the DTE. Sets S16
bit 6 when the test is in progress. This command may not be available in
some countries due to PTT restrictions. 

&V - Display Current Configuration and Stored Profiles
Reports the current (active) configuration, the stored (user) profiles,
and the first four stored telephone numbers. The stored profiles and
telephone numbers are not displayed if the NVRAM is not installed or is
not operational as detected by the NVRAM test during reset processing. 
Result Code:
OK
Example:
AT&V
ACTIVE PROFILE:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0 &K3 &Q5 &R1 &S0 &T4 &X0
&Y0
S00:002 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:030 S08:002
S09:006
S10:014 S11:255 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000 S38:020
S46:138 
S48:007 S95:000

STORED PROFILE 0:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0 &K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006 S10:014 S11:095 S12:050
S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000

STORED PROFILE 1:
B0 E1 L1 M1 N1 QO T V1 W0 X4 Y0 &C0 &D0 &G2 &J0 &K3 &Q5 &R1 &S0 &T4 &X0
S00:002 S02:043 S06:002 S07:030 S08:002 S09:006 S10:014 S11:095 S12:050
S18:000
S36:007 S37:000 S40:105 S41:003 S46:138 S95:000

TELEPHONE NUMBERS:
0 = 	1 =
2 = 	3 =

OK

&Wn - Store Current Configuration
Saves the current (active) configuration (profile), including S-Registers,
in one of the two user profiles in NVRAM as denoted by the parameter
value. This command will yield an ERROR message if the NVRAM is not
installed or is not operational as detected by the NVRAM test.
The current configuration is comprised of a list of storable parameters
illustrated in the &V command. These settings are restored to the active
configuration upon receiving an Zn command or at power up (see &Yn
command).
&W0	Store the current configuration as profile 0.
&W1	Store the current configuration as profile 1.
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.

&Xn - Select Synchronous Clock Source
Selects the source of the transmit clock for the synchronous mode of
operation. The parameter value, if valid, is written to S27 bits 4 and 5.
In asynchronous mode, the transmit and receive clocks are turned OFF. In
synchronous mode, the clocks are turned ON with the frequency of 1200 Hz
or faster corresponding to the speed that is selected for modem operation.
&X0	Selects internal timing. The modem generates the transmit clock
signal and applies it to the TXCLK output at the serial interface.
&X1	Selects external timing. The local DTE sources the transmit clock
signal on the XTCLK input of the serial interface. The modem applies this
clock to the TXCLK output at the serial interface.
&X2	Selects slave receive timing. The modem derives the transmit clock
signal from the incoming carrier and applies it to the TXCLK output at the
serial interface.
Result Codes:
OK	n = 0 to 2.
ERROR	Otherwise.
&Yn - Designate a Default Reset Profile
Selects which user profile will be used after a hard reset.
&Y0	The modem will use profile 0.
&Y1	The modem will use profile 1.
Result Codes:
OK	n = 0 to 1.
ERROR	If n > 1, or if NVRAM is not installed or is not operational.
&Zn=x - Store Telephone Number
The modem can store up to four telephone numbers and each telephone number
dial string can contain up to 35 digits.
&Zn=x	n = 0 to 3 and x = dial string. (Requires 256-byte NVRAM.)
Result Codes:
OK	For n ² 3, and x ² 35 digits.
ERROR	If n > 3, x > 35 digits, or if NVRAM is not installed or is not
operational.

3.2.3.	AT% Commands
%En - Enable/Disable Line Quality Monitor and Auto-Retrain or
Fallback/Fall Forward
Controls whether or not the modem will automatically monitor the line
quality and request a retrain (%E1) or fall back when line quality is
insufficient or fall forward when line quality is sufficient (%E2). The
parameter value, if valid, is written to S41 bits 2 and 6.
If enabled, the modem attempts to retrain for a maximum of 30 seconds.
%E0	Disable line quality monitor and auto-retrain. 
%E1	Enable line quality monitor and auto-retrain.
%E2	Enable line quality monitor and fallback/fall forward. (Default.)
Result Codes:
OK	n = 0, 1, or 2.
ERROR	Otherwise.
Fallback/Fall Forward. When %E2 is active, the modem monitors the line
quality (EQM). When line quality is insufficient, the modem will initiate
a rate renegotiation to a lower speed within the V.34/V.FC/V.32 bis/V.32
modulation speeds. The modem will keep falling back within the current
modulation if necessary until the speed reaches 2400 bps (V.34), 14400 bps
(V.FC), or 4800 bps (V.32). Below this rate, the modem will only do
retrains if EQM thresholds are exceeded. If the EQM is sufficient for at
least one minute, the modem will initiate a rate renegotiation to a higher
speed within the current modulation speeds. The rate renegotiations will
be done without a retrain if a V.32 bis connection is established.
Speeds attempted during fallback/fall forward are those shown to be
available in the rate sequences exchanged during the initial connection.
Fallback/fall forward is available in error correction and normal modes,
but not in direct mode or synchronous mode with external clocks. 
%L - Line Signal Level
Returns a value which indicates the received signal level. The value
returned is a direct indication (DAA dependent) of the receive level at
the MDP, not at the telephone line connector. For example, 009 = -9 dBm,
043 = -43 dBm, and so on.
Result Codes:
OK
%Q - Line Signal Quality
Reports the line signal quality (DAA dependent). Returns the higher order
byte of the EQM value. Based on the EQM value, retrain or fallback/fall
forward may be initiated if enabled by %E1 or %E2.
Example:
AT%Q

015
Result Codes:
OK	If connected.
ERROR 	If not connected, or connected in 300 bps, V.23, or fax modes.

3.2.4.	AT\ Commands
\Kn - Break Control
Controls the response of the modem to a break received from the DTE or the
remote modem or the \B command according to the parameter supplied. The
parameter value, if valid, is written to S40 bits 3, 4, and 5.
The response is different in three separate states.
The first state is where the modem receives a break from the DTE when the
modem is operating in data transfer mode:
\K0	Enter on-line command mode, no break sent to the remote modem.
\K1	Clear data buffers and send break to remote modem.
\K2	Same as 0.
\K3	Send break to remote modem immediately.
\K4	Same as 0.
\K5	Send break to remote modem in sequence with transmitted data.
(Default.)
The second case is where the modem is in the on-line command state
(waiting for AT commands) during a data connection, and the \B is received
in order to send a break to the remote modem:
\K0	Clear data buffers and send break to remote modem.
\K1	Clear data buffers and send break to remote modem. (Same as 0.)
\K2	Send break to remote modem immediately.
\K3	Send break to remote modem immediately. (Same as 2.)
\K4	Send break to remote modem in sequence with data.
\K5	Send break to remote modem in sequence with data. (Same as 4.)
(Default.)
The third case is where a break is received from a remote modem during a
non-error corrected connection:
\K0	Clears data buffers and sends break to the DTE.
\K1	Clears data buffers and sends break to the DTE. (Same as 0.)
\K2	Send a break immediately to DTE.
\K3	Send a break immediately to DTE. (Same as 2.)
\K4	Send a break in sequence with received data to DTE.
\K5	Send a break in sequence with received data to DTE. (Same as 4.)
(Default.)
Result Codes:
OK	n = 0 to 5.
ERROR	Otherwise.

\Nn - Operating Mode
This command controls the preferred error correcting mode to be negotiated
in a subsequent data connection. This command is affected by the OEM
firmware configuration.
\N0	Selects normal speed buffered mode (disables error-correction mode).
(Forces &Q6.)
\N1	Serial interface selected - Selects direct mode and is equivalent
to &M0, &Q0 mode of operation. (Forces &Q0.)
	Parallel interface selected - Same as \N0.
\N2	Selects reliable (error-correction) mode. The modem will first
attempt a LAPM connection and then an MNP connection. Failure to make a
reliable connection results in the modem hanging up. (Forces &Q5, S36=4,
and S48=7.)
\N3	Selects auto reliable mode. This operates the same as \N2 except
failure to make a reliable connection results in the modem falling back to
the speed buffered normal mode. (Forces &Q5, S36=7, and S48=7.)
\N4	Selects LAPM error-correction mode. Failure to make an LAPM
error-correction connection results in the modem hanging up. (Forces &Q5
and S48=0.) Note: The -K1 command can override the \N4 command.
\N5	Selects MNP error-correction mode. Failure to make an MNP
error-correction connection results in the modem hanging up. (Forces &Q5,
S36=4, and S48=128.)
Result Codes:
OK	n = 0 to 5.
ERROR	Otherwise.

3.2.5.	AT+ Commands
+MS - Select Modulation
This extended-format command selects the modulation, optionally enables or
disables automode, and optionally specifies the lowest and highest
connection rates using one to four subparameters. The command format is:
+MS= <mod> [,[<automode>][,[<min_rate>][,[<max_rate>]]]]<CR>
Notes:
1.	For 14400 bps and lower speeds, the Nn command and S37 register can
alternatively be used, in which case the +MS subparameters will modified
to reflect the Nn and S37=x settings. Use of the Nn and S37=x commands is
not recommended but is provided for compatibility with existing
communication software. (S37 is not updated by the +MS command.)
2.	Subparameters not entered (enter a comma only or <CR> to skip the last
subparameter) remain at their current values.
Reporting Selected Options
The modem can send a string of information to the DTE consisting of
selected options using the following command:
+MS?
The response is:
+MS: <mod>,<automode>,<min_rate>,<max_rate>
For example,
+MS: 11,1,300,28800 	(shows default values)
Reporting Supported Options
The modem can send a string of information to the DTE consisting of
supported options using the following command:
+MS=?
The response is:
+MS: (list of supported <mod> values), (list of supported <automode>
values) (list of supported <min_rate> values), 
(list of supported <max_rate> values)
For example,
+MS: (0, 1, 2, 3, 9, 10, 64, 69, 74), (0,1) (300-28800), (300-28800)
Subparameter Definitions
1.	<mod> = A decimal number which specifies the preferred modulation
(automode enabled) or the modulation (automode disabled) to use in
originating or answering a connection. The options are:
<mod>	Modulation 	Possible Rates (bps) 1	Notes
0	V.21	300	
1	V.22	1200	
2	V.22 bis	2400 or 1200	
3	V.23	1200	See Note 2
9	V.32	9600 or 4800	
10	V.32 bis	14400, 12000, 9600, 7200, or 4800	
11	V.34	28800, 26400, 24000, 21600, 19200, 16800, 14400, 12000,
9600, 7200, 4800, or 2400	Default
64	Bell 103	300	
69	Bell 212	1200	
74	V.FC	28800, 26400, 24000, 21600, 19200, 16800, or 14400	
Notes:
1.	See optional <automode>, <min_rate>, and <max_rate> subparameters.
2.	For V.23, originating modes transmit at 75 bps and receive at 1200
bps; answering modes transmit at 1200Êbps and receive at 75 bps. The rate
is always specified as 1200 bps.		
	The modem may also automatically switch to another modulation
(automode), subject to the following constraints:
a.	The modem may not be able to automatically switch from the current
modulation (specified by <mod>) to some other modulation. For example,
there is no standard way to automode from Bell 103 to V.23.
b.	The DTE may disable automode operation (see <automode> below).
c.	The DTE may constrain the range of modulations available by specifying
the lowest and highest rates (see <min_rate> and <max_rate> below).
2.	<automode> is an optional numeric value which enables or disables
automatic modulation negotiation using V.8 or V.32 bis Annex A. The
options are:
<automode>	Option Selected	Notes
0	Automode disabled	
1	Automode enabled using V.8 or V.32 Annex A	Default

The default value is 1, which enables automode. Note, however, there are
modulations for which there is no automatic negotiation, e.g., Bell 212
(<mod> = 69).
For <automode> = 0 (automode disabled, i.e., fixed modulation):
a.	If <max_rate> is within the rates supported by the selected
modulation, the selected rate is that specified by <max_rate>. For
example:
	+MS=9,0,1200,4800 selects V.32 4800 bps fixed rate.
b.	If <max_rate> is greater than the highest speed supported by the
modulation specified by <mod>, the starting rate is the highest rate
supported by the selected modulation. For example:
	+MS=9,0,2400,14400 selects V.32 9600 or 4800 bps.
c.	To emulate issuance of the N0S37=x command sequence to select fixed
mode operation, specify the <max_rate> and <min_rate> both to be the
(same) requested speed, and <mod> to be the modulation for that speed. For
example:
	+MS=11,0,16800,16800 selects V.34 16800 bps fixed mode (no comparable
S37 command).
	+MS=9,0,12000,12000 selects V.32 bis 12000 bps fixed mode (same as
N0S37=10).
For <automode> = 1 (automode enabled, i.e., automatically selected speed
and modulation): 
The modem connects at the highest possible rate in accordance with V.8, or
V.32 bis Annex A if V.8 is not supported by the remote modem. 
a.	If <max_rate> is greater than the highest rate supported by the
modulation specified by <mod>, the modem automodes down from the highest
rate of the selected modulation. For example:
	+MS=10,1,1200,24000 selects automoding down from V.32 bis 14400 bps. 
b.	To emulate issuance of the N1S37=x sequence command, specify the
modulation and the rate to start automoding down from using <mod> and
<max_rate>, respectively. Set <min_rate> to 300 to allow automoding all
the way down to V.21 300 bps. For example:
	+MS=11,1,300,16800 selects automode starting at V.34 16800 bps (no
comparable S37 command).
	+MS=9,1,300,12000 selects automode starting at V.32 bis 12000 bps (same
as N1S37=10).
3.	<min_rate> is an optional number which specifies the lowest rate at
which the modem may establish a connection. The value is decimal coded, in
units of bps, e.g., 2400 specifies the lowest rate to be 2400 bps. The
default is 300 for 300Êbps.
4.	<max_rate> is an optional number which specifies the highest rate at
which the modem may establish a connection. The value is decimal coded, in
units of bps, e.g., 14400 specifies the highest rate to be 14400 bps. The
default is 28800 for 28800 bps.

+Hn - Enable/Disable RPI and DTE Speed
This command enables or disables Rockwell Protocol Interface (RPI)
processing and sets the DTE speed.
+H0	Disable RPI.
+H1	Enable RPI and set DTE speed to 19200 bps.
+H2	Enable RPI and set DTE speed to 38400 bps.
+H3	Enable RPI and set DTE speed to 57600 bps.
Result Codes:
OK	n = 0 to 3.
ERROR	Otherwise.

3.2.7.	AT- Commands
-SDR=n -  Enable/Disable Distinctive Ring
This command enables or disables detection and reporting of distinctive
ring. The syntax is AT-SDR=n, where n is a number from 0 to 7. One, two,
or three distinctive ring types can be simultaneously enabled depending
upon the value of n (bit mapped). The detected ring type is reported in
the long form (verbose) of the result code by appending the ring type
number to the end of the RING message.
-SDR=0	Disables Distinctive Ring. Any valid ring detected is reported
as RING (default). 
-SDR=1	Enables Distinctive Ring Type 1.
-SDR=2	Enables Distinctive Ring Type 2.
-SDR=3	Enables Distinctive Ring Type 1 and 2.
-SDR=4	Enables Distinctive Ring Type 3.
-SDR=5	Enables Distinctive Ring Type 1 and 3.
-SDR=6	Enables Distinctive Ring Type 2 and 3.
-SDR=7	Enables Distinctive Ring Type 1, 2, and 3.
Result Codes:
OK	n = 0 to 7.
ERROR	Otherwise.
The n value bit map is:
Bit 0=1	Enable RING type 1. RING type 1 is detected and reported as
RING1.
Bit 1=1	Enable RING type 2. RING type 2 is detected and reported as
RING2.
Bit 2=1	Enable RING type 3. RING type 3 is detected and reported as
RING3.

The ring types supported and the corresponding ring cadence detect
criteria are:
Distinctive Ring Type	Ring Cadence Detect Criteria
1	2.0 sec ON, 4.0 sec OFF.
2	0.8 sec ON, 0.4 sec OFF, 0.8 sec ON, 4.0 sec OFF.
3	0.4 sec ON, 0.2 sec OFF, 0.4 sec ON, 0.2 sec OFF, 0.8 sec ON, 4.0 sec
OFF. 

Notes:
1.	The Ring Indicate (RI) output does not toggle on the first ring if
AT-SDR­0. 
2.	The RI output waveform is the same for all ring types detected, i.e.,
RI is on for the total duration of the ring period.
-SSE=n - Enable/Disable DSVD
This command enables or disables DSVD (digital simultaneous voice and
data) in modem models supporting DSVD. The syntax is AT-SSE=n, where n is
a number from 0 to 1. 
-SSE=0	Disables DSVD (default). 
-SSE=1	Enables DSVD.
Result Codes:
OK	n = 0 and 1.
ERROR	Otherwise.


3.3.	ERROR DETECTION AND DATA COMPRESSION COMMANDS
3.3.1.	AT% Commands
%C - Enable/Disable Data Compression
Enables or disables data compression negotiation. The modem can only
perform data compression on an error corrected link. The parameter value,
if valid, is written to S41 bits 0 and 1.
%C0	Disables data compression. Resets S46 bit 1.
%C1	Enables MNP 5 data compression negotiation. Resets S46 bit 1.
%C2	Enables V.42 bis data compression. Sets S46 bit 1.
%C3	Enables both V.42 bis and MNP 5 data compression. Sets S46 bit 1.
(Default.)
Result Codes:
OK	n = 0, 1, 2, or 3.
ERROR	Otherwise.
3.3.2.	AT\ Commands
\An - Select Maximum MNP Block Size
The modem will operate an MNP error corrected link using a maximum block
size controlled by the parameter supplied. The parameter value, if valid,
is written to S40 bits 6 and 7.
\A0	64 characters.
\A1	128 characters. (Default.)
\A2	192 characters.
\A3	256 characters.
Result Codes:
OK	n = 0 to 3.
ERROR	Otherwise.
\Bn - Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to
the remote modem with a length in multiples of 100 ms according to
parameter specified. If a number in excess of 9 is entered, 9 is used. The
command works in conjunction with the \K command.
In error correction mode, the modem will signal a break through the active
error correction protocol, giving no indication of the length.
\B1-\B9	Break length in 100 ms units. (Default = 3.) (Non-error corrected
mode only.)
Result Codes:
OK	If connected in data modem mode.
NO CARRIER	If not connected or connected in fax modem mode.
Note: When the modem receives a break from the remote modem, break is
passed to the DTE as follows: In non-error correction mode direct, the
break length is passed; in non-error correction mode normal and in error
correction mode, a 300 ms break is passed.


3.4.	MNP 10 COMMANDS
3.4.1.	AT) Commands
)Mn - Enable Cellular Power Level Adjustment
Enables or disables automatic adjustment of the transmit power level to
accommodate the signalling requirements of cellular telephone equipment.
S40 bit 2 and S201 bit 6 are reset when )M0 is active; S40 bit 2 is set
and S201 bit 6 is reset when )M1 is active; S40 bit 2 and S201 bit 6 are
set when )M2 is active. 
)M0	Disables transmit power level adjustment during MNP 10 link
negotiation. The )M0 command allows transmit power adjustment if cellular
operation is requested by the remote modem. Uses wireline power level for
initial cellular connection. (Default.)
)M1	Enables transmit power level adjustment during MNP 10 link
negotiation. Uses the @Mn value, or the value from the cellular driver
(see 3.7) when operating in direct connect mode, to establish initial
cellular connection. After connection, the optimal power level is
determined by the modem. NOTE: )M1 should not be used with *H2. 
)M2	Enables transmit power level adjustment during MNP 10 link
negotiation. Uses the @Mn value, or the value from the cellular driver
(see 3.7) when operating in direct connect mode, to establish initial
cellular connection. After connection, the power level remains fixed. 
Result Codes:
OK	n = 0 to 2.
ERROR	Otherwise.
Notes:
1.	For both cellular and land based modems in both originate or answer
modes, if either )M1 or )M2 is set, the transmit power level used for
non-MNP 10 or fax connections is either the @Mn value or the value from
the cellular driver (see 3.7).
2.	Power Level Considerations. The following tables define the power
levels chosen for each mode of operation. The transmit power levels are
given in the form initial/final, where initial is the power level of the
handshake at V.22 in *H1 modes or the power level of the initial V.32 bis
handshake in *H0 or *H2 modes, and final is the power level of the
subsequent V.32 bis handshake in *H1 modes or the power level after a
retrain in *H0 or *H2 modes. A power level indicated by "<" means that the
final power level is adjusted from the preferred level by the dynamic
transmit level adjustment (DTLA) algorithm.
Cellular Modem (Remote Modem also MNP 10 Compatible)
Local Configuration -->	*H1)M1 	*H2)M1	*H1)M2	*H2)M2
@M0	-10/<-26	-26/<-26	-10/-26	-26/-26
@M1	-10/<-30	-30/<-30	-10/-30	-30/-30
@M10	-10/<-10	-10/<-10	-10/-10	-10/-10
@Mn (n = 11 to 30)	-10/<-n	-n/<-n	-10/-n	-n/-n

Land Modem 
Local Configuration -->	*H0)M0	*H0)M1	*H0)M2
		
Remote Configuration -->	*H0)M0	*H1)M1 or *H1)M2	*H2)M1 or *H2)M2
	*H0, *H1, or *H2	*H0, *H1, or *H2
@M0	-10/-10	-10/<-26	NR	-26/<-26	-26/-26
@M1	-10/-10	-10/<-30	NR	-30/<-30	-30/-30
@M10	-10/-10	-10/<-10	NR	-10/<-10	-10/-10
@Mn (n = 11 to 30)	-10/-10	-10/<-n	NR	-n/<-n	-n/-n
Notes:
1.	NR = Not Recommended.
2.	In direct connect mode, the cellular driver value is used in place
of the @Mn value; DTLA still functions in direct connect mode when )M1 is
set, but it would be better to use )M2. 					

*Hn - Link Negotiation Speed
This command controls the connection speed for link negotiations before
upshift occurs between two MNP 10 modems. The parameter value, if valid,
is written to S28 bits 6 and 7.
*H0	Link negotiation occurs at the highest supported speed. (Default.)
*H1	Link negotiation occurs at 1200 bps; used primarily for establishing
cellular connections.
*H2	Link negotiation occurs at 4800 bps; used primarily to negotiate an
MNP 10 connection on less than average quality telephone lines.
Result Codes:
OK	n = 0 to 2.
ERROR	Otherwise.
-Kn - MNP Extended Services
Enables or disables conversion of a V.42 LAPM connection to an MNP 10
connection. The parameter value, if valid, is written to S40 bits 0 and 1.
-K0	Disables V.42 LAPM to MNP 10 conversion.
-K1	Enables V.42 LAPM to MNP 10 conversion. (Default.)
-K2	Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended
Services initiation during V.42 LAPM answer mode detection phase.
Result Codes:
OK	n = 0 or 2.
ERROR	Otherwise.
-Qn - Enable Fallback to V.22 bis/V.22
Enables or disables fallback from MNP 10 to V.22 bis/V.22. The parameter
value, if valid, is written to S41 bit 7.
-Q0	Disables fallback to 2400 bps (V.22 bis) and 1200 bps (V.22).
Fallback is enabled only to 4800 bps.
-Q1	Enables fallback to 2400 bps (V.22 bis) and 1200 bps (V.22).
(Default.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.
-SEC=n - Enable/Disable MNP10-EC
Enables or disables MNP10-EC operation. The command format is: 
	-SEC=n,[<tx level>]	where <tx level> is the optional transmit level
sub parameter.
-SEC=0	Disable MNP10-EC; the transmit level is that defined in S91.
-SEC=1,[<tx level>]	Enable MNP10-EC; the transmit level will be defined
by the sub parameter <tx level> range 0 to 30 (0 dBm to -30 dBm), the
default <tx level> (<tx level> not specified) is the S91 value.
Result Codes:
OK	n=0, 1, or 1 and <tx level>=0 to 30
ERROR	Otherwise
Example: AT-SEC=1,18 enables MNP10-EC and sets the transmit level to -18
dBm.
Note: If AT-SEC=0 the modem will automatically set AT-SEC=1 if the remote
modem indicates Cellular in the V.8 phase.
Inquiries
AT-SEC?	Retrieves the current -SEC command settings, e.g., 1,18.

@Mn - Initial Cellular Power Level Setting
Sets the initial transmit power level for upshift at connect until line
conditions can be determined. @M0 corresponds to -26ÊdBm, @M1 corresponds
to -30 dBm, @M2 through @M10 correspond to -10 dBm, and @M11 through @M30
correspond to -11 dBm to -30 dBm, respectively. The parameter value, if
valid, is written to S201 bits 0-4. 
@M0	-26 dBm (Default.)
@M1	-30 dBm
@M2	-10 dBm
@M3 - @M10 	-10 dBm
@M11 	-11 dBm
@M12	-12 dBm
.
.
.
@M30 	-30 dBm
Result Codes:
OK	n = 0 to 30.
ERROR	Otherwise.
:E - Compromise Equalizer Enable Command
Enables or disables the V.32 compromise equalizer. The parameter value, if
valid, is written to S201 bit 5. This command can be used when the modem
is attached to either a flat line or a cellular connection.
:E0	Disables the equalizer
:E1	Enables the equalizer (Default.)
Result Codes:
OK	n = 0 or 1.
ERROR	Otherwise.

3.5.	W-CLASS COMMANDS
3.5.1.	AT* Commands
*B - Display Blacklisted Numbers
This command requests the modem to return a list of blacklisted numbers to
the DTE. The format of the response is shown by the example below.
Permanently forbidden numbers as defined by country requirements will not
appear on this list. If no numbers are blacklisted, only the OK result
code is issued.
Example:
	NO. - PHONE NUMBER -
	------ ------------------------------
	1;	4175537660
 	2;	8288924961
	3;	3887278862
	4;	3124839442
	5;	6284664
	
	OK
*D - Display Delayed Numbers
This command causes the modem to send a list of the delayed numbers
together with the delay associated with each. The modem will return a list
of delayed telephone numbers as defined in the *B command. The format of
the response is shown by the example below (delay times are shown as
hours:minutes:seconds). If no numbers are delayed, only the OK result code
is issued.
Example:
	NO. - PHONE NUMBER -DELAY
	------ -------------------------------------------
	1;	8264734660	2:00:00
	2;	7532634661	2:00:00
	3;	2587334662	0:02:00
	4;	7532651663	0:03:25
	5;	7459931664	0:01:45
	
	OK

3.6.	CALLER ID COMMANDS
3.6.1.	AT#CID Command
#CIDn - Caller ID
Enables or disables Caller ID.
#CID=0	Disables Caller ID. (Default.)
#CID=1	Enables Caller ID with formatted presentation to the DTE. The
modem will present the data items in a <Tag><Value> pair format. The
expected pairs are data, time, caller code (telephone number), and name.
#CID=2	Enables Caller ID with unformatted presentation to the DTE. The
modem will present the entire packet of information, excluding the leading
U's, in ASCII printable hex numbers.
Result Codes:
OK	n = 0 or 2.
ERROR	Otherwise.
Inquiries
#CID?	Retrieves the current Caller ID mode from the modem.
#CID=?	Returns the mode capabilities of the modem in a list with each
element separated by commas.
Formatted Form Reporting
The modem presents the data in the <tag> = <value> pair format as
described in the table below. Spaces are present on both sides of the
equal sign.
	Tag	Description
DATE	DATE = MMDD where MM is the month number (01 to 12) and DD is the
day number (01..31).
TIME	TIME = HHMM where HH is the hour number (00 to 23) and MM is the
minute number (00 to 59).
NMBR	NMBR = <number> or P or O where <number> is the telephone number
of the caller, where P indicates that the calling number information is
not available since the originating caller has requested private service,
and where O indicates that the calling number information is not available
or out of service at the calling location.
NAME	NAME = <listing name> where <listing name> is the subscription
name.
MESG	MESG = <data tag> <length of message> <data> <checksum> in printable
ASCII hex numbers. This tag indicates a data item not listed above. The
message is only possible for Multiple Message Format.
Notes:
1.	The modem does not present any Caller ID information if the DCE
detects a checksum error in the Caller ID packet.
2.	In the event of an unrecognized data tag, the modem will present the
data in ASCII hex numbers following the MESG tag.

Example of Formatted Form Reporting
1.	The following example illustrates the standard Caller ID message
packet.
RING
DATE	=	0321
TIME	=	1405
NMBR	=	5045551234
NAME	=	A N OTHER
RING
RING
2.	The following example illustrates the case where the tag of the packet
is not recognized by the modem.
RING
MESG	=	060342424231
RING
RING
Unformatted Form Reporting
The modem presents all information and packet control information found in
the message. The modem, however, excludes the leading U's (channel seizure
information) from the presentation. The packet is presented in ASCII
printable hex numbers, the modem does not insert spaces, or line feeds,
for formatting between bytes or words of the packet.
The modem does not detect the checksum of the packet.
Example of Unformatted Form Reporting
RING
0412303332323234303539313435353132333435
RING
RING

3.7.	CELLULAR COMMANDS
The Direct Connect Modem allows a direct interface to most cellular
telephones eliminating the need for other intelligent interfaces. 
Landline modems operate with the telephone system by either going off hook
detecting dialtone and the dialing the telephone number using pulses or
DTMF digits, or detecting the RING signal and answering the call.
Intelligent cellular phone interfaces connect between the modems RJ-11
socket and the cellular phone's data interface. The interface provides
landline features to the modem (line current, dial tone, ringing, etc.),
and translates the modem's signals (off hook, DTMF digits, etc.) into
signals that the cellular phone understands. Once connected the interface
acts as a transparent link between the modem and the cellular telephone.
The Direct Connect Modem interfaces directly to the cellular phone's data
interface and provides direct control over the cellular phones operation.
For example if the user were to instruct the modem to dial using the
ATDTnnnn command the modem would relay the telephone number and the SEND
command to the cellular phone over the data interface.
The modem connects to the cellular phone using a special cable which must
be purchased separately. A different cable is required for each cellular
phone or make of cellular phones. Below is a block diagram of a typical
Direct Connect Cellular Modem (based on AK14-X270 Rev 4 reference
schematic).
3.7.1.	Cellular Phone Drivers
The data interface to cellular phones differs between manufacturers and
models and requires a unique cellular phone driver for each phone or group
of phones. Therefore the particular phone driver needs to be downloaded
from the PC into the modem's RAM before the modem can be used directly
with the cellular phone. If a driver is not loaded the modem will operate
as a normal landline modem.
3.7.2.	Cellular Commands
^C2 - Download Cellular Phone Driver
The ^C2 command initiates the cellular phone driver download function.
Upon receipt of the command, the modem issues the "OK" message. The user
then performs an ASCII download of the driver (in .S37 format) from the
host to the modem, typically using a communications software package (with
transmit pacing turned off). 
^C2	Download Cellular Phone command
Result Codes:
OK
[Download Process]
OK	Cellular phone driver download completed successfully
ERROR	Cellular phone driver download not completed successfully, e.g.,
checksum of record (in S37 file) is not correct, driver size is larger
than 2k bytes, or an invalid driver is downloaded, or modem is connected.
^I - Identify Cellular Phone Driver
The modem reports the identification of the loaded cellular phone driver
in response to the ^I command. The response is dependent upon the driver. 
Result Codes (Typical):
CELLULAR DRIVER: OKI 900/910
(c) Copyright 1994, Spectrum Cellular, Inc.
Version 0.07 Thu Jan 10:29:52 1994
OK
or
ERROR	Cellular phone driver is not loaded

^T6 - Indicate Status of Cellular Phone
The status of the cellular phone connected to the modem is reported in
response to the ^T6 command. The status is reported in a single byte
formatted as a decimal number. The individual status signals assigned to
the status byte bits are:
	bit 0	1 =	Cellular phone is receiving an incoming call
	bit 1	1 =	Cellular phone is in use
	bit 2	1 =	Cellular phone is locked (cannot be used)
	bit 3	1 =	There is no service for cellular phone (does not
indicate signal strength)
	bit 4	1 =	Cellular phone is powered on
	bit 5	1 =	Cellular driver is initialized
	bit 6	0 =	Reserved (0)
	bit 7	1 =	Cellular cable detected
Result Codes (typical):
128	(Cellular cable detected)
OK
Application of ^T6 Status Byte
The information obtained by issuing a AT^T6 can be used to determine if
the loading of the cellular phone driver is necessary by the host
software. A download is not necessary if landline (or no cable) is
connected to the modem, in which ^T6 will return a value of 0 (bit 7=0). A
download is necessary when a cellular cable is detected (implied cellular
phone is also connected), in which ^T6 will return a value of 128 (bit
7=1). Once a driver is downloaded to the modem, it will be able to operate
in landline or cellular mode based on detection of a cellular cable.
3.7.3.	Operation
Once the driver is loaded and the modem is connected to the cellular
phone, and the phone is powered on dial/answer functions will be routed
through the phone instead of the landline DAA, i.e., no special commands
are needed to place or answer calls, the same AT commands and software
packages that are used for landline communication sessions can be used. If
the cellular phone is not connected or is powered off dial/answer
functions will be routed through the landline DAA, and if V.42 bis
connection is established the cellular phone driver will be purged so that
the V.42 bis dictionaries can be increased to their normal size.
While the modem is being used with a cellular phone it will respond with
normal result messages with the following differences in meaning:
NO DIALTONE	Indicates that cellular service is not currently available.
RING	Indicates that the cellular phone is receiving an incoming call.
Modem Configuration
Modem performance will be improved by modification of your standard
configuration, it is recommended that the landline modem also be MNP10 EC
compatible for reliable communications.
MNP10 EC to MNP10 EC Connection
Cell Site	AT -SEC=1,12  &C1 &D2 	(optional for the connect message:
AT S95=46)
Base Site	AT -SEC=1,18 &C1 &D2	(optional for the connect message: AT
S95=46)
MNP10 EC  to MNP10 Link Negotiation at 4800 bps (Quick Connect)
Cell Site	AT -SEC=1,12 &C1 &D2	(optional for the connect message: AT
S95=46)
Base Site	AT&F  )M2 @M18 &C1 &D2	(optional for the connect message:
AT S95=46)
AT -SEC=1,12 will put the modem into EC mode, the transmit level will be
-12 dBm. The optimum trnsmit level will depend on the phone being used.
MNP10 EC  to Non-MNP10 Modems
If calls are made from a cellular modem to a landline modem that does not
support MNP10 EC or MNP10 EC the following configuration is recommended:
AT -SEC=1,12 %E2
If calls cannot reliably be made using the above configuration, it may be
necessary to force the connection to 9600 bps or slower using the
following configuration string:
AT -SEC=1,12 %E2 N1 S37=9 	(V.32 bis modems) or
AT -SEC=1,12 %E2 +MS=11,1,300,9600 	(V.34 modems)
Disabling MNP10 EC
AT -SEC=0 will disable MNP10 EC, however if the remote modem indicates
cellular during the V.8 negotiation AT-SEC=1 will automatically be set
(V.34 only).
Fax Configuration
It is recommended that fax transmissions be configured to operate at  9600
bps in V.17 mode or 7200 bps in V.29 mode.
Cellular Phone Configuration
To achieve the best operational performance, a cellular data connection
should be attempted in a location where adequate signal strength is
observed for the cellular phone. This condition can be easily monitored on
some phones with signal strength indicator. In locations where even voice
calls are unreliable, data connections should not be attempted. Under some
circumstances a special high gain antenna may improve performance.
Additional information regarding the use of the cellular phone and
cellular network should be obtained from the service provider and or
cellular phone manufacturer.

3.8.	AT COMMAND RESULT CODES
The modem responds to commands from the DTE and to activity on the line by
signalling to the DTE in the form of result codes. The result codes that
the modem can send are described below.
Two forms of each result code are available: long-form, an English-like
"verbose" response, and short-form, a data-like numeric response (included
in parentheses following the long-form). The long-form code is preceded
and terminated by the sequence < CR> < LF>. The short-form is terminated
by < CR>, only with no preceding sequence.
If result messages are suppressed, nothing is returned to the DTE. The
long-form results codes can be modified by the OEM through the ConfigurACE
Configuration Utility Program. (See ConfigurACE description.)
0- OK
The OK code is returned by the modem to acknowledge execution of a command
line.
1- CONNECT
The modem will send this result code upon connecting when:
1.	The line speed is 300 bps and the modem has been instructed to report
the line speed to the DTE upon connecting, or
2.	The DTE speed is 300 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting, or
3.	The range of result code responses is restricted by the X command such
that no speed reporting is allowed.
2- RING
The modem sends this result code when incoming ringing is detected on the
line. What qualifies as a ring signal is determined by country-dependent
parameters, modifiable through ConfigurACE.
When cellular interface is selected, RING indicates that the cellular
phone is receiving an incoming call.
3- NO CARRIER
The modem sends this result code when attempting to establish a call if:
1.	Ringback is detected and later ceases but no carrier is detected
within the period of time determined by register S7, or
2.	No ringback is detected within the period of time determined by
register S7.
This result code is also used when the modem auto-disconnects due to loss
of carrier.
Under X0, if busy tone detection is enforced, this result code is used as
a response to the detection of busy or circuit busy. Under X0, if dial
tone detection is enforced or selected, this result code is used to
indicate that dial tone has not been detected.
4- ERROR
The modem returns this result code if the command line contains a syntax
error or it is unable to execute a command contained in the command line.
It is issued if a command does not exist or if the parameter supplied is
outside the permitted range.
Under X0, X1, X2, and X3, this result is used instead of DELAYED and
BLACKLISTED.
5- CONNECT 1200
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 1200 bps and the modem has been instructed to report
the line speed to the DTE upon connecting, or
2.	The DTE speed is 1200 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
(Also, see the W command.)
6- NO DIALTONE
For X2 and X4, the modem sends this result code if it has been instructed
to wait for dial tone during dialing but none is received.
When cellular phone interface is selected, NO DIALTONE indicates that
cellular service is not currently available.
7- BUSY
For X3 and X4, if busy tone detection is enforced, the modem sends this
result code when attempting to originate a call if the busy (engaged)
signal is detected on the line.
8- NO ANSWER
The modem sends this result code when attempting to originate a call if a
continuous ringback signal is detected on the line until the expiration of
the timer S7.
9- CONNECT 0600
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 600 bps and the modem has been instructed to report
the line speed to the DTE upon connecting, or
2.	The DTE speed is 600 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
10- CONNECT 2400
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 2400 bps and the modem has been instructed to report
the line speed to the DTE upon connecting, or
2.	The DTE speed is 2400 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
11- CONNECT 4800
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 4800 bps and the modem has been instructed to report
the line speed to the DTE upon connecting, or
2.	The DTE speed is 4800 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
12- CONNECT 9600
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 9600 bps and the modem has been instructed to report
the line speed to the DTE upon connecting, or
2.	The DTE speed is 9600 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
13- CONNECT 7200
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 7200 bps and the modem has been instructed to report
the line speed to the DTE upon connecting, or
2.	The DTE speed is 7200 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
14- CONNECT 12000
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 12000 bps and the modem has been instructed to
report the line speed to the DTE upon connecting, or
2.	The DTE speed is 12000 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
15- CONNECT 14400
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 14400 bps and the modem has been instructed to
report the line speed to the DTE upon connecting, or
2.	The DTE speed is 14400 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.
16- CONNECT 19200
For X1, X2, X3, and X4, the modem sends this result code when:
1.	The line speed is 19200 bps and the modem has been instructed to
report the line speed to the DTE upon connecting, or
2.	The DTE speed is 19200 bps and the modem has been instructed to report
the DTE speed to the DTE upon connecting.

17- CONNECT 38400
For X1, X2, X3, and X4, the modem sends this result code upon connecting
when the DTE speed is 38400 bps and the modem has been instructed to
report the DTE speed to the DTE upon connecting.
18- CONNECT 57600
For X1, X2, X3, and X4, the modem sends this result code upon connecting
when the DTE speed is 57600 bps and the modem has been instructed to
report the DTE speed to the DTE upon connecting.
19- CONNECT 115200
For X1, X2, X3, and X4, the modem sends this result code upon connecting
when the DTE speed is 115200 bps and the modem has been instructed to
report the DTE speed to the DTE upon connecting.
22- CONNECT 75TX/1200RX
For X1, X2, X3, and X4, the modem returns this result code upon
establishing a V.23 originate connection when the modem has been
instructed to report the DCE speed upon connection.
23- CONNECT 1200TX/75RX
For X1, X2, X3, and X4, the modem returns this result code upon
establishing a V.23 answer connection when the modem has been instructed
to report the DCE speed upon connection.
24- DELAYED
For X4, the modem returns this result code when a call fails to connect
and the number dialed is considered 'delayed' due to country blacklisting
requirements.
32- BLACKLISTED
For X4, the modem returns this result code when a call fails to connect
and the number dialed is considered 'blacklisted'.
33- FAX
The modem returns this result code when a fax modem connection is
established in a facsimile mode.
35- DATA
The modem returns this result code when a data modem connection is
established in a facsimile mode.
40- CARRIER 300
The modem returns this result code when a 0-300 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
44- CARRIER 1200/75
The modem sends this result code when the V.23 backward channel carrier
has been detected on the line and carrier reporting has been enabled. (See
S95 and Xn.)
45- CARRIER 75/1200
The modem sends this result code when the V.23 forward channel carrier has
been detected on the line and carrier reporting has been enabled. (See S95
and Xn.)
46- CARRIER 1200
The modem sends this result code when a 1200 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
47- CARRIER 2400
The modem sends this result code when a 2400 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
48- CARRIER 4800
The modem sends this result code when a 4800 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
49- CARRIER 7200
The modem sends this result code when a 7200 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
50- CARRIER 9600
The modem sends this result code when a 9600 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
51- CARRIER 12000
The modem sends this result code when a 12000 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
52- CARRIER 14400
The modem sends this result code when a 14400 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
53- CARRIER 16800
The modem sends this result code when a 16800 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
54- CARRIER 19200
The modem sends this result code when a 19200 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
55- CARRIER 21600
The modem sends this result code when a 21600 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
56- CARRIER 24000
The modem sends this result code when a 24000 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
57- CARRIER 26400
The modem sends this result code when a 26400 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
58- CARRIER 28800
The modem sends this result code when a 28800 bps data rate has been
detected on the line and carrier reporting has been enabled. (See S95 and
Xn.)
59- CONNECT 16800
For X1, X2, X3, and X4, the modem returns this result code upon connecting
when the DTE speed is 16800 bps and the modem has been instructed to
report the DTE speed upon connecting.
61- CONNECT 21600
For X1, X2, X3, and X4, the modem returns this result code upon connecting
when the DTE speed is 21600 bps and the modem has been instructed to
report the DTE speed upon connecting.
62- CONNECT 24000
For X1, X2, X3, and X4, the modem returns this result code upon connecting
when the DTE speed is 24000 bps and the modem has been instructed to
report the DTE speed upon connecting.
63- CONNECT 26400
For X1, X2, X3, and X4, the modem returns this result code upon connecting
when the DTE speed is 26400 bps and the modem has been instructed to
report the DTE speed upon connecting.
64- CONNECT 28800
For X1, X2, X3, and X4, the modem returns this result code upon connecting
when the DTE speed is 28800 bps and the modem has been instructed to
report the DTE speed upon connecting.
66- COMPRESSION: CLASS 5
This message is sent to the DTE when the modem has connected in MNP Class
5 and COMPRESSION message reporting has been enabled. (See S95 and Xn.)
67- COMPRESSION: V.42 bis
This message is sent to the DTE when the modem has connected in V.42 bis
and COMPRESSION message reporting has been enabled. (See S95 and Xn.)
69- COMPRESSION: NONE
This message is sent to the DTE when the modem has connected without data
compression and COMPRESSION message reporting has been enabled. (See S95
and Xn.)
70- PROTOCOL: NONE
This message is sent to the DTE when the modem has connected without any
form of error correction, and the PROTOCOL message reporting has been
enabled. (See S95 and Xn.)
77- PROTOCOL: LAPM
This message is sent to the DTE when the modem has connected in the V.42
LAPM mode of error correction, and PROTOCOL message reporting has been
enabled. (See S95 and Xn.)
80- PROTOCOL: ALT
This message is sent to the DTE when the modem has connected in the MNP
mode of error correction, and PROTOCOL message reporting has been enabled.
(See S95 and Xn.)
81- PROTOCOL: ALT-CELLULAR
This message is sent to the DTE when the modem has connected in the MNP 10
mode and cellular power level adjustment is enabled (")M1 or )M2").(See
S95 and Xn.)
+F4- +FCERROR
This message is sent to the DTE when high speed fax data (V.27, V.29,
V.33, or V.17) is expected and a V.21 signal is received.


4.	S-REGISTERS
The S-Registers are summarized in Table 4-1 along with their default
values. Registers denoted with an '*' in Table 4-1 may be stored in one of
the two user profiles by entering the &Wn command. One of these profiles
may be loaded at any time by using the Zn command. Registers or register
fields quoted as ÒreservedÓ are reserved for current or future use by the
firmware, or are permanently overridden by PTT limitations. For the
latter, control of the equivalent functionality is available with
ConfigurACE Call Progress and Blacklisting options. 
All bit-mapped registers are read-only. The appropriate AT command which
controls the relevant bits in the S-Register should be used to change the
value. 
4.1.	FACTORY DEFAULTS
The factory default values are stored in ROM and are loaded into the
active configuration at power up or by the ATZn command. In addition, the
designated default profile is subsequently loaded, and may change some of
the factory default values. The designated default profile can be changed
by entering the &Yn command where n is one of the two possible user
profiles.
The defaults shown are those used by Rockwell in factory profiles zero and
one. These may be overwritten by the OEM with ConfigurACE prior to placing
the firmware in PROM. Minimum and maximum values may also be imposed by
ConfigurACE in response to country PTT requirements.
The default values shown in Table 4-1 may vary by modem firmware
configuration. Consult the MCU firmware release notes for exact
configuration.
The factory default values may be loaded at any time by entering the &Fn
command.

Table 4-1.	S-Register Summary
Register	Function	Range	Units	Saved	Default**
S0	Rings to Auto-Answer	0-255	rings	*	0
S1	Ring Counter	0-255	rings		0
S2	Escape Character	0-255	ASCII	*	43
S3	Carriage Return Character	0-127	ASCII		13
S4	Line Feed Character	0-127	ASCII		10
S5	Backspace Character	0-255	ASCII		8
S6	Wait Time for Dial Tone	2-255	s	*	2
S7	Wait Time for Carrier	1-255	s	*	50
S8	Pause Time for Dial Delay Modifier	0-255	s	*	2
S9	Carrier Detect Response Time	1-255	0.1 s	*	6
S10 	Carrier Loss Disconnect Time	1-255	0.1 s 	*	14
S11	DTMF Tone Duration	50-255	0.001 s	*	95
S12	Escape Prompt Delay	0-255	0.02 s 	*	50
S13 	Reserved	-	-		-
S14 	General Bit Mapped Options Status	-	-	*	138 (8Ah)
S15 	Reserved	-	-		-
S16	Test Mode Bit Mapped Options Status (&T)	-	-		0
S17	Reserved	-	-		-
S18 	Test Timer	0-255	s	*	0
S19	AutoSync Options	-	-		0
S20	AutoSync HDLC Address or BSC Sync Character	0-255	-	*	0
S21	V.24/General Bit Mapped Options Status	-	-	*	4 (04h)
S22 	Speaker/Results Bit Mapped Options Status	-	-	*	117
(75h)
S23 	General Bit Mapped Options Status		-	*	54 (36h) 
S24 	Sleep Inactivity Timer	0-255	s	*	0
S25 	Delay to DTR Off	0-255	s or 0.01 s		5
S26 	RTS-to-CTS Delay	0-255	0.01 s		1
S27 	General Bit Mapped Options Status	-	-	*	9 (09h)
S28 	General Bit-Mapped Options Status	-	-	*	0
S29	Flash Dial Modifier Time	0-255	10 ms		0
S30 	Disconnect Inactivity Timer	0-255	10 s		0
S31 	General Bit-Mapped Options Status	-	-	*	2
S32	XON Character	0-255	ASCII		17 (11h)
S33	XOFF Character	0-255	ASCII		19 (13h)
S34-S35 	Reserved	-	-		-
S36 	LAPM Failure Control	-	-	*	7
S37 	Line Connection Speed	-	-	*	0
S38 	Delay Before Forced Hangup	0-255	s		20
S39 	Flow Control Bit Mapped Options Status	-	-	*	3

Table 4-1.	S-Register Summary (ContÕd)
Register	Function	Range	Units	Saved	Default**
S40 	General Bit-Mapped Options Status	-	-	*	105 (69h)
(Non-MNP 10 models)
107(6Bh) (MNP 10 models)
S41	General Bit-Mapped Options Status	-	-	*	3
S42-S45 	Reserved	-	-		-
S46	Data Compression Control	-	-	*	138
S48 	V.42 Negotiation Control	-	-	*	7
S82 	LAPM Break Control	-	-		128(40h)
S86 	Call Failure Reason Code	0-255	-		-
S91 	PSTN Transmit Attenuation Level	0-15	dBm		10 (Country
dependent)
S92	Fax Transmit Attenuation Level	0-15	dBm		10 (Country
dependent)
S95 	Result Code Messages Control	-	-	*	0
S201	Cellular Transmit Level	0-63		*	58
* Register value may be stored in one of two user profiles with the &W
command.
¥¥ Default values may be modified using
ConfigurACE.									

4.2.	S-REGISTER DEFINITIONS
S0 - Number of Rings to Auto-Answer
Sets the number of the rings required before the modem automatically
answers a call. Setting this register to zero disables auto-answer mode.
Range:	0-255 rings
Default:	0
S1 - Ring Counter
S1 is incremented each time the modem detects a ring signal on the
telephone line. S1 is cleared if no rings occur over an eight second
interval.
Range:	0-255 rings
Default:	0
S2 - Escape Character
S2 holds the decimal value of the ASCII character used as the escape
character. The default value corresponds to an ASCII '+'. A value over 127
disables the escape process, i.e., no escape character will be recognized.
Range:	0-255, ASCII decimal
Default:	43 (+)
S3 - Carriage Return Character
Sets the command line and result code terminator character. Pertains to
asynchronous operation only. 
Range:	0-127, ASCII decimal
Default:	13 (Carriage Return)
S4 - Line Feed Character
Sets the character recognized as a line feed. Pertains to asynchronous
operation only. The Line Feed control character is output after the
Carriage Return control character if verbose result codes are used
Range:	0-127, ASCII decimal
Default:	10 (Line Feed)
S5 - Backspace Character
Sets the character recognized as a backspace. Pertains to asynchronous
operation only. The modem will not recognize the Backspace character if it
is set to a value that is greater than 32 ASCII. This character can be
used to edit a command line. When the echo command is enabled, the modem
echoes back to the local DTE the Backspace character, an ASCII space
character and a second Backspace character; this means a total of three
characters are transmitted each time the modem processes the Backspace
character.
Range:	0-32, ASCII decimal
Default:	8 (Backspace)

S6 - Wait Time for Dial Tone Before Blind Dialing, or After ÒWÓ Dial
Modifier (W-Class Models) 
1.	Sets the length of time, in seconds, that the modem will wait before
starting to dial after going off-hook when blind dialing. This operation,
however, may be affected by some ATX options according to country
restrictions. The ÒWait for Dial ToneÓ call progress feature (W dial
modifier in the dial string) will override the value in register S6. 
2.	For W-class models, S6 sets the length of time, in seconds, that the
modem will wait for dial tone when encountering a ÒWÓ dial modifier before
returning NO DIAL TONE result code.
The modem always pauses for a minimum of 2 seconds, even if the value of
S6 is less than 2 seconds. 
Range:	2-255 seconds
Default:	2
S7 - Wait Time For Carrier After Dial, For Silence, or For Dial Tone After
ÒWÓ Dial Modifier (US Models)
1.	Sets the length of time, in seconds, that the modem will wait for
carrier before hanging up. The timer is started when the modem finishes
dialing (originate), or 2 seconds after going off-hook (answer). In
originate mode, the timer is reset upon detection of answer tone if
allowed by country restrictions.
2.	Sets the length of time, in seconds, that modem will wait for silence
when encountering the @ dial modifier before continuing with the next dial
string parameter.
3.	For US models, S7 sets the length of time, in seconds, that the modem
will wait for dial tone when encountering a ÒWÓ dial modifier before
continuing with the next dial string parameter.
Range:	1-255 seconds
Default:	50
S8 - Pause Time For Dial Delay
Sets the time, in seconds, that the modem must pause when the Ò,Ó dial
modifier is encountered in the dial string.
Range:	0-255 seconds
Default:	2
S9 - Carrier Detect Response Time
Sets the time, in tenths of a second, that the carrier must be present
before the modem considers it valid and turns on RLSD. As this time is
increased, there is less chance to detect a false carrier due to noise
from the telephone line.
Range:	1-255 tenths of a second
Default:	6 (0.6 second)
S10 - Lost Carrier To Hang Up Delay
Sets the length of time, in tenths of a second, that the modem waits
before hanging up after a loss of carrier. This allows for a temporary
carrier loss without causing the local modem to disconnect. When register
S10 is set to 255, the modem functions as if a carrier is always present.
The actual interval the modem waits before disconnecting is the value in
register S10 minus the value in register S9. Therefore, the S10 value must
be greater than the S9 value or else the modem disconnects before it
recognizes the carrier.
Range:	1-255 tenths of a second
Default:	14 (1.4 seconds)
S11 - DTMF Tone Duration
Sets the duration of tones in DTMF dialing (US models only). This value
has no effect on pulse dialing.
For W-class models, this parameter is a country parameter loaded by
ConfigurACE.
Range:	50-255 milliseconds
Default:	95 (95 milliseconds)
S12 - Escape Prompt Delay (EPD)
Defines the maximum period, in fiftieths of a second, allowed between
receipt of the last character of the three escape character sequence from
the DTE and sending of the OK result code to the DTE. If any characters
are detected during this time, the OK will not be sent. Note that sending
of the OK result code does not affect entry into command mode. (See
3.1.3.)
Range:	0-255 1/50 of a second
Default:	50 (1 second)
S13 - Reserved
S14 - General Bit Mapped Options Status
Indicates the status of command options. 
Default: 138 (8Ah) (10001010b)
Bit 0 Ñ	This bit is ignored. 
Bit 1 Ñ	Command echo (En)
0 =	Disabled (E0)
1 =	Enabled (E1) (Default.)
Bit 2 Ñ	Quiet mode (Qn)
0 =	Send result codes (Q0) (Default.)
1 =	Do not send result codes (Q1)
Bit 3 Ñ	Result codes (Vn)
0 =	Numeric (V0) 
1 =	Verbose (V1) (Default.)
Bit 4 Ñ	Reserved
Bit 5 Ñ	Tone (T)/Pulse (P)
0 =	Tone (T) (Default.)
1 =	Pulse (P)
Bit 6 Ñ	Reserved
Bit 7 Ñ	Originate/Answer
0 =	Answer
1 =	Originate (Default.)
S15 - Reserved

S16 - General Bit Mapped Test Options Status
Indicates the test in progress status. 
Default:	0
Bit 0 Ñ	Local analog loopback
0 =	Disabled (Default.)
1 =	Enabled (&T1)
Bit 1 Ñ	Not used
Bit 2 Ñ	Local digital loopback
0 =	Disabled (Default.)
1 =	Enabled (&T3)
Bit 3 Ñ	Remote digital loopback (RDL) status 
0 =	Modem not in RDL (Default.)
1 =	RDL in progress
Bit 4 Ñ	RDL requested (AT&T6)
0 =	RDL not requested (Default.)
1 =	RDL requested (&T6)
Bit 5 Ñ	RDL with self test
0 =	Disabled (Default.)
1 =	Enabled (&T7)
Bit 6 Ñ	Local analog loopback (LAL) with self test
0 =	Disabled (Default.)
1 =	Enabled (&T8)
Bit 7 Ñ	Not used
S17 - Reserved
S18 - Test Timer
Sets the length of time, in seconds, that the modem conducts a test
(commanded by &Tn) before returning to the command mode. If this register
value is zero, the test will not automatically terminate; the test must be
terminated from the command mode by issuing an &T0 or H command. When S18
is non-zero, the modem returns the OK message upon test termination.
Range:	0-255 seconds
Default:	0

S19 - AutoSync Bit Mapped Options
Defines the options for AutoSync operation (see &Q4 command). S19 must be
set to the desired value before &Q4 is issued.
Default:	0
Bit 0 Ñ	Reserved
Bit 1 Ñ	BSC/HDLC format select
0 =	BSC selected (Default.)
1 =	HDLC selected
Bit 2 Ñ	Address detection enable/disable
0 =	Disabled (Default.)
1 =	Enabled
Bit 3 Ñ	NRZI/NZI coding select
0 =	NRZI (Default.)
1 =	NZI
Bit 4 Ñ	Idle indicator select
0 =	Mark idle (Default.)
1 =	Flag or sync idle
Bits 5 - 7 Ñ	Reserved
S20 - AutoSync HDLC Address or BSC Sync Character
Defines the HDLC address (S19 bit 1 = 1) or BSC Sync Character (S19 bit 1
= 0) for AutoSync operation (see &Q4 command). S20 must be set to the
desired value before &Q4 is issued.
Range:	0-255 
Default:	0

S21 - V.24/General Bit Mapped Options Status
Indicates the status of command options.
Default:	4 (00000100b)
Bit 0 Ñ	Set by &Jn command but ignored otherwise.
0 =	&J0 (Default.)
1 =	&J1
Bit 1 Ñ	Reserved
Bit 2 Ñ	CTS behavior (&Rn)
0 =	CTS tracks RTS (&R0) 
1 =	CTS always on (&R1) (Default.)
Bits 3-4 Ñ	DTR behavior (&Dn)
0 =	&D0 selected (Default.)
1 =	&D1 selected
2 =	&D2 selected
3 =	&D3 selected
Bit 5 Ñ	RLSD (DCD) behavior (&Cn)
0 =	&C0 selected (Default.)
1 =	&C1 selected
Bit 6 Ñ	DSR behavior (&Sn)
0 =	&S0 selected (Default.)
1 =	&S1 selected
Bit 7 Ñ	Long space disconnect (Yn)
0 =	Y0 (Default.)
1 =	Y1

S22 - Speaker/Results Bit Mapped Options Status
Indicates the status of command options.
Default:	117 (75h) (01110101b)
Bits 0-1 Ñ	Speaker volume (Ln)
0 =	Off (L0)
1 =	Low (L1) (Default.)
2 =	Medium (L2)
3 =	High (L3)
Bits 2-3 Ñ	Speaker control (Mn)
0 =	Disabled (M0)
1 =	Off on carrier (M1) (Default.)
2 =	Always on (M2)
3 =	On during handshake (M3)
Bits 4-6 Ñ	Limit result codes (Xn)
0 =	X0
4 =	X1
5 =	X2
6 =	X3
7 =	X4 (Default.)
Bit 7Ñ	Reserved

S23 - General Bit Mapped Options Status
Indicates the status of command options.
Default:	54 (36h) (00110110b)
Bit 0Ñ	Grant RDL
0 =	RDL not allowed (&T5) (Default.)
1 =	RDL allowed (&T4) 
Bits 1-3 Ñ	DTE Rate
0 =	0 - 300 bps
1 =	600 bps
2 =	1200 bps
3 =	2400 bps (Default.)
4 =	4800 bps
5 =	9600 bps
6 =	19200 bps
7 =	38400 bps or higher
Bits 4-5 Ñ	Assumed DTE parity 
0 =	even
1 =	not used
2 =	odd
3 =	none (Default.)
Bits 6-7 Ñ	Guard tone (&Gn)
0 =	None (&G0) (Default.)
1 =	None (&G1)
2 =	1800 Hz (&G2)
S24 - Sleep Inactivity Timer
Sets the length of time, in seconds, that the modem will operate in normal
mode with no detected telephone line or DTE line activity before entering
low-power sleep mode. The timer is reset upon any DTE line or telephone
line activity. If the S24 value is zero, neither DTE line nor telephone
inactivity will cause the modem to enter the sleep mode. 
Range:	0-255 seconds
Default:	0
S25 - Delay To DTR
Sets the length of time that the modem will ignore DTR for taking the
action specified by &Dn. Its units are seconds for synchronous modes and
one hundredths of a second for other modes.
Range:	0-255 (1 second for synchronous modes 1; 0.01 second otherwise)
Default:	5
S26 - RTS to CTS Delay 
Sets the time delay, in hundredths of a second, before the modem turns CTS
ON after detecting an OFF-to-ON transition on RTS when &R0 is commanded.
Pertains to synchronous operation only. 
Range:	0-255 hundredths of a second
Default:	1

S27 - Bit Mapped Options Status
Indicates the status of command options.
Default:	9 (09h) (00001001b) 
Bits 0,1,3 Ñ	Synchronous/asynchronous selection (&Mn/&Qn)
3	1	0	
0	0	0	 =	&M0 or &Q0
0	0	1	=	&M1 or &Q1
0	1	0	 =	&M2 or &Q2
0	1	1	 =	&M3 or &Q3
1	0	0	=	&Q4
1	0	1	 =	&Q5 (Default.)
1	1	0	 =	&Q6 
Bit 2 Ñ	Leased line control (&Ln)
0 =	Dial up line (&L0) (Default.)
1 =	Leased line (&L1)
Bits 4 - 5 Ñ	Internal clock select (&Xn)
0 =	Internal clock (&X0) (Default.)
1 =	External clock (&X1)
2 =	Slave clock (&X2)
Bit 6 Ñ	CCITT/Bell mode select (Bn)
0 =	CCITT mode (B0) (Default.) 
1 =	Bell mode (B1)
Bit 7 - Reserved

S28 - Bit Mapped Options Status
Default:	0
Bits 0-1 Ñ	Reserved
Bit 2 Ñ	Reserved (always 0).
Bits 3 - 4 Ñ	Pulse dialing (&Pn)
0 =	39%-61% make/break ratio at 10 pulses per second (&P0) (Default.)
1 =	33%-67% make/break ratio at 10 pulses per second (&P1)
2 =	39%-61% make/break ratio at 20 pulses per second (&P2)
3 =	33%-67% make/break ratio at 20 pulses per second (&P3)
Bit 5 Ñ	Reserved
Bits 6-7 Ñ	MNP Link Negotiation Speed (*Hn)
0 =	Link negotiation at highest speed (*H0) (Default.)
1 =	Link negotiation at 1200 bps (*H1)
2=	Link negotiation at 4800 bps (*H2)
S29 - Flash Dial Modifier Time
Sets the length of time, in units of 10 ms, that the modem will go on-hook
when it encounters the flash (!) dial modifier in the dial string. The
time can be limited as it is a country dependent parameter.
Range:	0-255 10 ms intervals
Default:	0 (disabled)
S30 - Disconnect Inactivity Timer
Sets the length of time, in tens of seconds, that the modem will stay
online before disconnecting when no data is sent or received. In
error-correction mode, any data transmitted or received will reset the
timer. In other modes, any data transmitted will reset the timer. The
timer is inoperative in synchronous mode. 
Range:	0-255 tens of seconds (0-2550 seconds)
Default:	0 (disabled)

S31 - Bit Mapped Options Status
Default:	2 (00000010b)
Bit 0 Ñ	Reserved
Bit 1 Ñ	Controls auto line speed detection (Nn) 
0 =	Disabled (N0)
1 =	Enabled (N1) (Default.)
Bits 2-3 Ñ	Controls error correction progress messages (Wn)
0 =	DTE speed only (W0) (Default.)
1 =	Full reporting (W1)
2 =	DCE speed only (W2)
Bit 3 Ñ	Reserved
Bits 4-7 Ñ	Reserved
S32 - XON Character
Sets the value of the XON character.
Range:	0-255, ASCII decimal
Default:	17 (11h)
S33 - XOFF Character
Sets the value of the XOFF character.
Range:	0-255, ASCII decimal
Default:	19 (13h)
S34-S35 - Reserved
S36 - LAPM Failure Control
Default:	7 (00000111b)
Bits 0-2 Ñ	This value indicates what should happen upon a LAPM failure.
These fallback options are initiated immediately upon connection if
S48=128. If an invalid number is entered, the number is accepted into the
register, but S36 will act as if the default value has been entered.
0 =	Modem disconnects.
1 =	Modem stays on-line and a Direct mode connection is established.
2 =	Reserved.
3 =	Modem stays on-line and a Normal mode connection is established.
4 =	An MNP connection is attempted and if it fails, the modem
disconnects.
5 =	An MNP connection is attempted and if it fails, a Direct mode
connection is established.
6 =	Reserved.
7 =	An MNP connection is attempted and if it fails, a Normal mode
connection is established. (Default.)
Bits 3-7 Ñ	Reserved

S37 - Desired Line Connection Speed
This register specifies the desired line connection speed.
Notes: 
1.	When the Nn command is issued or the S37 register value is modified,
the +MS command subparameters are updated to reflect the speed and
modulation specified by the S37 value (see +MS command). For example:
If N0 command is active, S37=10 updates the +MS command subparameters to
reflect +MS=10,1,300,12000
If N1 command is active, S37=10 updates the +MS command subparameters to
reflect +MS=10,0,12000,12000
2.	S37 is not updated by the +MS command.
3.	Use of the +MS command is recommended instead of the Nn and S37=x
commands. Nn and S37=x commands are supported for compatibility with
existing communication software. 
Default:	0
Bits 0-4 Ñ	Desired line connection speed. If an invalid number is
entered, the number is accepted into the register, but S37 will act as if
the default value has been entered.
0 =	Attempt automode connection. If N0 is active, connection is attempted
at the most recently sensed DTE speed (+MS command settings are updated to
the appropriate values). If N1 is active, connection is attempted at the
highest possible speed (+MS settings are updated to 11,1,300,2880 to
reflect V.34, automode, 300 bps minimum speed, and 28800 bps maximum
speed). (Default.)
1-3 =	Attempt to connect at 300 bps.
4 =	Reserved.
5 =	Attempt to connect at V.22 1200 bps.
6 =	Attempt to connect at V.22 bis 2400 bps.
7 =	Attempt to connect at V.23.
8 =	Attempt to connect at V.32 bis/V.32 4800 bps.
9 =	Attempt to connect at V.32 bis/V.32 9600 bps.
10 =	Attempt to connect at V.32 bis 12000 bps.
11 =	Attempt to connect at V.32 bis 14400 bps.
12 =	Attempt to connect at V.32 bis 7200 bps.
Bits 5-7 Ñ	Reserved

S38 - Delay Before Forced Hang Up
This register specifies the delay between the modem's receipt of the H
command to disconnect (or ON-to-OFF transition of DTR if the modem is
programmed to follow the signal), and the disconnect operation. Applicable
to error-correction connection only. This register can be used to ensure
that data in the modem buffer is sent before the modem disconnects.
1.	If S38 is set to a value between 0 and 254, the modem will wait that
number of seconds for the remote modem to acknowledge all data in the
modem buffer before disconnecting. If time expires before all data is
sent, the NO CARRIER result code will be issued to indicate that data has
been lost. If all data is transmitted prior to time-out, the response to
the H0 command will be OK.
2.	If S38 is set to 255, the modem does not time-out and continues to
attempt to deliver data in the buffer until the connection is lost or the
data is delivered.
Range:	0-255 seconds
Default:	20
S39 - Flow Control Bit Mapped Options Status
Default:	3 (00000011b)
Bits 0-2 Ñ	Status of command options
0 =	No flow control 
3 =	RTS/CTS (&K3) (Default.)
4 =	XON/XOFF (&K4)
5 =	Transparent XON (&K5)
6 =	Both methods (&K6)
Bits 3-7 Ñ	Reserved

S40 - General Bit Mapped Options Status
Indicates the status of command options.
Default:	105 (69h) (01101001b) 
Bit 0 - 1Ñ	 MNP Extended Services (-Kn)
0 =	Disable extended services (-K0) (Default for non-MNP 10 models.)
1 =	Enable extended services (-K1) (Default for MNP 10 models.)
2 =	Enable extended services (-K2)
Bit 2Ñ	Power Level Adjustment for Cellular Use ()Mn) (see S201 bit 6)
0 =	Disable power level adjustment ()M0) (Default.)
1 =	Enable power level adjustment ()M1 or )M2)
Bits 3-5 Ñ	Break Handling (\Kn)
0 =	\K0
1 =	\K1
2 =	\K2
3 =	\K3
4 =	\K4
5 =	\K5 (Default.)
Bits 6-7 Ñ	MNP block size (\An)
0 =	64 chars (\A0)
1 =	128 chars (\A1) (Default.)
2 =	192 chars (\A2)
3 =	256 chars (\A3)

S41 - General Bit Mapped Options Status
Indicates the status of command options.
Default:	131 (10000011b)
Bits 0 -1 Ñ	Compression selection (%Cn)
0 =	Disabled (%C0)
1 =	MNP 5 (%C1)
2 =	V.42 bis (%C2)
3 =	MNP 5 and V.42 bis (%C3) (Default.)
Bit 2, 6Ñ	Auto retrain and fallback/fall forward (%En)
	Bit 6	Bit 2
	0 	0	=	Retrain and fallback/fall forward disabled (%E0)
(Default.)
	0	1	=	Retrain enabled (%E1)
	1	0	=	Fallback/fall forward enabled (%E2) 
Bit 3 Ñ	Reserved
Bits 4-5 Ñ	Reserved
Bit 7 Ñ	Enable fallback to V.22 bis/V.22 (-Qn)
0 =	Disabled (-Q0)
1 =	Enabled (-Q1) (Default.)
S46 - Data Compression Control
Controls selection of compression. The following actions are executed for
the given values:
Range:	136 or 138
Default:	138
S46=136	Execute error correction protocol with no compression.
S46=138	Execute error correction protocol with compression. (Default.)
S48 - V.42 Negotiation Action
The V.42 negotiation process determines the capabilities of the remote
modem. However, when the capabilities of the remote modem are known and
negotiation is unnecessary, this process can be bypassed if so desired.
Range:	0, 7, or 128 If an invalid number is entered, it is accepted into
the S-Register, but S48 will act as if 128 has been entered.
Default:	7
S48=0	Disable negotiation; bypass the detection and negotiation phases;
and proceed with LAPM.
S48=7	Enable negotiation. (Default.)
S48=128 	Disable negotiation; bypass the detection and negotiation
phases; and proceed at once with the fallback action specified in S36. Can
be used to force MNP.

S82 - Break Handling Options
S82 is for compatibility purposes only, changing this register will not
have any affect.
S86 - Call Failure Reason Code
When the modem issues a NO CARRIER result code, a value is written to this
S-Register to help determine the reason for the failed connection. S86
records the first event that contributes to a NO CARRIER message. The
cause codes are:
Range:	0, 4, 5, 9, 12, 13, or 14
Default:	
S86=0	Normal disconnect, no error occurred.
S86=4	Loss of carrier.
S86=5 	V.42 negotiation failed to detect an error-correction modem at the
other end.
S86=9 	The modems could not find a common protocol.
S86=12	Normal disconnect initiated by the remote modem.
S86=13 	Remote modem does not respond after 10 re-transmissions of the
same message.
S86=14 	Protocol violation.
S91 - PSTN Transmit Attenuation Level
Sets the transmit attenuation level from 0 to 15 dBm for the PSTN mode,
resulting in a transmit level from 0 to -15ÊdBm, In some countries, the
transmit level may not be changed and there are checks to prevent transmit
attenuation level change using ConfigurACE.
Range:	0 to 15 dBm (Corresponding to 0 to -15 dBm transmit level.)
Default:	10 (-10 dBm transmit level.)
S92 - Fax Transmit Attenuation Level
Sets the transmit attenuation level from 0 to 15 dBm for the fax mode,
resulting in a transmit level from 0 to -15ÊdBm. In some countries, the
transmit level may not be changed and there are checks to prevent transmit
attenuation level change using ConfigurACE. 
Range:	0 to 15 dBm (Corresponding to 0 to -15 dBm transmit level.)
Default:	10 (-10 dBm transmit level.)

S95 - Extended Result Codes
The bits in this register can be set to override some of the Wn command
options. A bit set to a 1 in this register will enable the corresponding
result code regardless of the Wn setting. Also, refer to Table 3-1. 
Default:	0
Bit 0 Ñ	CONNECT result code indicates DCE speed instead of DTE speed.
Bit 1 Ñ	Append/ARQ to CONNECT XXXX result code in error-correction mode
(XXXX = rate; see TableÊ3Ð1).
Bit 2 Ñ	Enable CARRIER XXXX result code (XXXX = rate; see Table 3-1).
If a V.FC connection is established, /VFC is appended to the CARRIER XXXX
message, e.g., CARRIER 28800/VFC (note that there is no short form for
this message).
Bit 3 Ñ	Enable PROTOCOL XXXX result code (XXXX = protocol identifier; see
Table 3-1).
Bit 4 Ñ	Reserved.
Bit 5 Ñ	Enable COMPRESSION result code (XXXX = compression type; see
Table 3-1).
Bit 6 Ñ	Reserved.
Bit 7 Ñ	Reserved.
S201 - Cellular Transmit Level
The bits in this register are set by the @Mn and :En commands to support
cellular connections.
Default:	20h
Bits 0 - 4 Ñ	Initial Cellular Power Level Setting (@Mn; default = @M0)
Bit 5 Ñ	Compromise Equalizer Enable Command (:En; default = E1)
Bit 6 Ñ	Lock Power Level Adjustment for Cellular Use ()Mn) (see S40 bit
2)
0 =	Auto power level adjustment ()M0 or )M1) (Default.)
1 =	Lock power level adjustment ()M2)
Bit 7 Ñ	Reserved.


5.	FAX CLASS 1 COMMANDS
5.1.	FAX I/O PROCESSING
The fax I/O interface supports asynchronous serial and parallel
interfaces. The interface rate is 19200 bps. The character format is 8
bits data, no parity, and 1 stop bit. Start and stop elements are removed
from the transmit data and added to the receive data. Both transmit and
receive data are buffered. Flow control using XON/XOFF (DC1/DC3) or
RTS/CTS is provided.
Unique control character strings are identified, filtered, or reinserted
into the I/O data stream. These control characters and their resultant
action are described below.
5.1.1.	DTE-to-Modem Transmit Data Stream
	Characters Detected	Action Taken
	<DLE><data>	Delete <DLE><data> characters.
	<DLE><ETX>	Recognize as a string terminator and take appropriate
action.
	<DLE><DLE>	Replace with single <DLE> character.

5.1.2.	Modem-to-DTE Receive Data Stream

	Characters Detected	Action Taken
	<DLE>	Insert extra <DLE> ahead of <DLE>.
The modem also identifies the end of a frame by inserting <DLE><ETX> into
the data stream after the FCS bytes. 
5.1.3.	Fax Mode Selection
Fax class 1 commands are identified in Table 5-1. Fax modes and rates are
determined by the AT+F commands as described in Section 5.2.
Table 5-1.	Fax Class 1 Commands
Command	Function
Service Class ID	
+FCLASS=	Service Class
Fax Class 1 Commands	
+FAE=n	Data/Fax Auto Answer
+FTS=n	Stop Transmission and Wait
+FRS=n	Receive Silence
+FTM=n	Transmit Data
+FRM=n	Receive Data
+FTH=n	Transmit Data with HDLC Framing
+FRH=n	Receive Data with HDLC Framing 

5.1.4.	Fax Origination
Origination of fax calls is made using the ATD command. Upon completion of
the dial function, a calling tone at 1100 Hz is transmitted, with a
cadence of 0.5 seconds on and 3 seconds off. The modem automatically
enters mode +FRH=3 and sends the CONNECT message to the DTE when FSK flags
are detected from the remote.

5.1.5.	Fax Answering
Answering of fax calls is identical to answering of data calls with the
exception that the modem enters the fax handshaking mode instead of the
data handshaking mode after going off-hook. If +FAE=0, the modem, after
sending answer tone, automatically enters fax mode (+FTH=3), sends the
CONNECT message to the DTE, and starts sending FSK flags. If +FAE=1, the
modem determines whether the caller is a data modem or fax modem and sends
the DATA or FAX result code, respectively, to the DTE. 
5.1.6.	Fax Control Transmission
Fax control transmission is initiated by the +FTH=n command. After this
command is issued, the modem generates the CONNECT message and transmits
carrier in the modulation scheme specified by the parameter n. The modem
then transmits HDLC flags for a minimum of 1 second. The modem continues
to transmit the HDLC flags until it receives a character from the DTE.
When characters are received from the DTE, the modem adds start and end
flags, performs zero-bit insertion, generates FCS, and deletes <DLE><chr>
character pairs before transmitting the characters to the remote fax
machine. Each <DLE><DLE> sequence is transmitted as a single <DLE>.
<DLE><ETX> is considered as the end of frame marker and is not
transmitted. All data received from the DTE after <DLE><ETX> is ignored by
the modem until the modem generates either the CONNECT, OK, or ERROR
result code.
If no more data is in the transmit buffer and the final bit was a 1 (bit 4
of the second byte received from the DTE), the modem generates the OK
result code and returns to the command mode. If the final bit was a 0, the
modem generates the CONNECT message and waits for further data from the
DTE while transmitting HDLC flags. If no more data is received before 5
seconds elapse, the modem drops carrier, goes on-hook, and generates the
ERROR result code.
5.1.7.	Fax Control Reception
Fax control reception is initiated using the AT+FRH=n command. After this
command is issued, the modem looks for carrier in the modulation scheme
specified by the parameter n. If no carrier is detected before the period
of time specified by register S7 expires, the modem generates the NO
CARRIER message and returns to command mode. If a carrier is detected that
is not the one specified by the parameter n, the modem generates the
+FCERROR message and returns to the command mode. If the specified carrier
is detected, the modem generates the CONNECT message and enters the HDLC
receive mode.
In HDLC receive mode, the modem receives HDLC frames from the remote fax
machine, strips the flags, performs zero-bit deletion, performs error
checking, and handles <DLE><chr> character pairs before passing the data
to the DTE. The modem prefixes each <DLE> character with another <DLE>
character before sending it to the DTE. After the last byte in the frame,
the modem sends <DLE><ETX> to the DTE marking the end of the frame. The
modem then generates either the OK message if no errors were detected or
the ERROR message if errors were detected (FCS is incorrect), and returns
to command mode.
While in command mode, the modem continues to receive data in the selected
modulation scheme, and sends the data after sending the CONNECT message to
the DTE when the DTE reissues the +FRH command with the same parameter. If
the DTE issues the +FRH command with a different parameter, the modem
clears all buffers and proceeds as described previously.
If carrier is lost while in command mode and the DTE reissues the +FRH
command with the same parameter, and there is no data in the buffer, the
modem sends the ERROR result code to the DTE and returns to the command
mode. If there is data in the buffer, the modem sends the next frame of
buffered data to the DTE, followed by <DLE><ETX>, and either the ERROR
result code if errors were detected or the OK result code if no errors
were detected. The modem then returns to command mode.
The modem concludes an error is detected if carrier is lost for any period
of time during or before the reception of a frame. If carrier is lost for
a time period longer than the time specified by the register S10, the
modem finishes delivering the data in the receive buffer (if any) to the
DTE, sends <DLE><ETX>, generates the ERROR message, and returns to command
mode. All subsequent data received from the remote is discarded.
If the modem detects a frame abort sequence (seven consecutive ones with
no zero insertion) while it is waiting for a frame beginning flag (it was
receiving HDLC flags), it will wait for the HDLC flags again until either
carrier is lost, or the DTE aborts the process by sending an abort
character or by dropping DTR with &D2 in effect. If the frame abort
sequence is detected while the modem is receiving a frame it finishes
delivering the data in the receive buffer (if any) to the DTE, sends
<DLE><ETX>, generates the ERROR message, and returns to command mode. The
modem keeps looking for HDLC flags followed by more data from the remote,
with the selected modulation scheme.
If the modem detects a receive buffer overflow condition, it concludes
that there was an FCS error in that frame. The modem will receive more
frames only if a starting flag is detected and there is room in the
receive buffer. If a starting flag is detected and there is no room in the
buffer, the modem discards all data in that frame.
If the modem receives any character from the DTE after the +FRH command
(except flow control characters if software flow control is in effect), or
if the modem detects a high-to-low transition of the DTR signal while &D1
is in effect, it sends <DLE><ETX> to the DTE, generates OK result code,
and returns to command mode. The receive buffer is cleared and all data
received from the remote is discarded. If the modem detects a DTR drop
while &D2 is in effect, it goes on-hook, sends <DLE><ETX> to the DTE,
generates OK result code, and returns to command mode. If the modem
detects a DTR drop while &D3 is in effect, the modem performs a warm
reset.
5.1.8.	Fax Data Transmission
Fax data transmission is initiated by the AT+FTM=n command. After this
command is issued, the modem generates the CONNECT message and transmits
carrier in the modulation scheme specified by the parameter n. The modem
then transmits constant 1 bits for a minimum of one second and continues
to transmit constant 1 bits until it receives a character from the DTE.
When data is received from the DTE, the modem deletes start and stop bits
and deletes all <DLE><chr> character pairs before transmitting the data to
the remote. Each <DLE><DLE> sequence is transmitted as a single <DLE>.
<DLE><ETX> is considered as the end of stream marker, and is not
transmitted. All data received from the DTE after the <DLE><ETX> is
ignored by the modem until the modem generates either the CONNECT, OK, or
ERROR result code.
If no more data is in the transmit buffer, and the last transmitted
character was not an ASCII NULL, the modem generates the OK result code
and returns to the command mode. If the last character transmitted was an
ASCII NULL, the modem generates the CONNECT message to the DTE and waits
for further data from the DTE while transmitting NULLs to the remote. If
more data is received before five seconds elapse, the modem continues to
transmit the data as described in the previous paragraph. If five seconds
elapse and no data is received from the DTE, the modem drops carrier, goes
on-hook, and generates the ERROR result code.
5.1.9.	Fax Data Reception
Fax data reception is initiated using the AT+FRM=n command. After this
command is issued, the modem looks for carrier in the modulation scheme
specified by the parameter n. If no carrier is detected before the period
of time specified by register S7 expires, the modem generates the NO
CARRIER message and returns to command mode. If a V.21 carrier is detected
when a high speed carrier is expected, the modem generates the +FCERROR
message and returns to the command mode. If the specified carrier is
detected, the modem generates the CONNECT message and enters the data
receive mode.
While in data receive mode, the modem receives data from the remote, adds
start and stop bits, and handles <DLE><chr> character pairs before passing
the data to the DTE. The modem prefixes each <DLE> character with another
<DLE> character before sending it to the DTE.
If carrier is lost for a time period longer than the time specified by the
register S10, the modem finishes delivering the data in the receive buffer
(if any) to the DTE, sends <DLE><ETX>, generates the NO CARRIER result
code, and returns to the command mode. All subsequent data received from
the remote is discarded.
If the modem detects a receive buffer overflow condition, it stops
receiving from the remote until there is room in the receive buffer. The
modem informs the DTE of the buffer overflow after it sends to the DTE the
last character that was stored in the buffer before the overflow occurred.
If the modem receives any character from the DTE after the +FRM command
(except flow control characters if software flow control is in effect), or
if the modem detects a high-to-low transition of the DTR signal while &D1
is in effect, it sends <DLE><ETX> to the DTE, generates the OK result
code, and returns to command mode. The receive buffer is cleared and all
data received from the remote is discarded. If loss of DTR is detected
while &D2 is in effect, the modem goes on-hook, sends <DLE><ETX> followed
by OK result code to the DTE, and returns to command mode. If the modem
detects a DTR drop while &D3 is in effect, the modem performs a warm
reset.

5.2.	COMMANDS
+FCLASS=n - Select Service Class
+FCLASS=n command sets the active service class.
Parameters: 0-2 
Command options:
+FCLASS=0	Select Data Mode (Default.)
+FCLASS=1	Select Facsimile Class 1
+FCLASS=2	Select Facsimile Class 2
+F<command>? - Report Active Configuration
+F<command>? interrogates the modem to determine the active configuration.
Typical responses are:
+FAE?	0 if auto answer is disabled; 1 if auto answer is enabled
+FCLASS?	0 if in data mode; 1 if in fax class 1; 2 if in fax class 2
+F<command>=? - Report Operating Capabilities
+F<command>=? can be used to determine the operating capabilities of the
modem.
Typical responses are:
+FAE=?	0 or 1
+FCLASS=?	0, 1, or 2
+FTM=?	24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146 
+FRM=?	24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146 
+FAE=n - Data/Fax Auto Answer
+FAE=n allows the DTE to either restrict answering to class 1, or to
automatically detect whether the calling station is a fax class 1 modem or
data modem, and answer accordingly. 
Parameters: n = 0 or 1
Command options:
n = 0	Disable data/fax auto answer mode. The modem answers as a fax modem
only. (Default.)
n = 1	Enable data/fax auto answer mode. The modem answers as a fax or
data modem.
After a data (not fax) connection is achieved (indicated by the DATA
result code), the DTE must issue an ATO command to cause the modem to go
on-line.
+FTS=n - Stop Transmission and Wait
+FTS=n causes the modem to terminate a transmission and wait for n 10-ms
intervals before responding with the OK result code. An ERROR response
code results if this command is issued while the modem is on-hook.
+FRS=n - Receive Silence
+FRS=n causes the modem to report back to the DTE with an OK result code
after n 10 ms-intervals of silence have been detected on the line. This
command is aborted if any character is received from the DTE. The modem
discards the aborting character and issues an OK result code. An ERROR
response code results if this command is issued while the modem is
on-hook.

+FTM=n - Transmit Data
+FTM=n causes the modem to transmit data using the modulation defined
below. An ERROR response code results if this command is issued while the
modem is on-hook.
Parameters: See Command options
Command options:
	+FTM=24	V.27 ter 2400 bps
	+FTM=48	V.27 ter 4800 bps
	+FTM=72	V.29 7200 bps
	+FTM=73	V.17 7200 bps long
	+FTM=74	V.17 7200 bps short 
	+FTM=96	V.29 9600 bps
	+FTM=97	V.17 9600 bps long
	+FTM=98	V.17 9600 bps short
	+FTM=121	V.17 12000 bps long
	+FTM=122	V.17 12000 bps short
	+FTM=145	V.17 14400 bps long
	+FTM=146	V.17 14400 bps short
+FRM=n - Receive Data
+FRM=n causes the modem to enter the receiver mode using the modulation
defined below. An ERROR response code results if this command is issued
while the modem is on-hook.
Parameters: See Command options
Command options:
	+FRM=24	V.27 ter 2400 bps
	+FRM=48	V.27 ter 4800 bps
	+FRM=72	V.29 7200 bps 
	+FRM=73	V.17 7200 bps long 
	+FRM=74	V.17 7200 bps short 
	+FRM=96	V.29 9600 bps 
	+FRM=97	V.17 9600 bps long
	+FRM=98	V.17 9600 bps short
	+FRM=121	V.17 12000 bps long
	+FRM=122	V.17 12000 bps short
	+FRM=145	V.17 14400 bps long
	+FRM=146	V.17 14400 bps short

+FTH=n - Transmit Data with HDLC Framing
+FTH=n causes the modem to transmit data using HDLC protocol and the
modulation defined below. An ERROR response code results if this command
is issued while the modem is on-hook.
Parameters: See Command options.
Command options:
	+FTH=3	V.21 channel 2 300 bps
	+FTH=24	V.27 ter 2400 bps
	+FTH=48	V.27 ter 4800 bps
	+FTH=72	V.29 7200 bps
	+FTH=73	V.17 7200 bps long 
	+FTH=74	V.17 7200 bps short 
	+FTH=96	V.29 9600 bps
	+FTH=97	V.17 9600 bps long
	+FTH=98	V.17 9600 bps short
	+FTH=121	V.17 12000 bps long
	+FTH=122	V.17 12000 bps short
	+FTH=145	V.17 14400 bps long
	+FTH=146	V.17 14400 bps short
+FRH=n - Receive Data with HDLC Framing
+FRH=n causes the modem to receive frames using HDLC protocol and the
modulation defined below. An ERROR response code results if this command
is issued while the modem is on-hook.
Parameters: See Command options.
Command options:
	+FTH=3	V.21 channel 2 300 bps
	+FRH=24	V.27 ter 2400 bps
	+FRH=48	V.27 ter 4800 bps
	+FRH=72	V.29 7200 bps
	+FRH=73	V.17 7200 bps long 
	+FRH=74	V.17 7200 bps short 
	+FRH=96	V.29 9600 bps
	+FRH=97	V.17 9600 bps long
	+FRH=98	V.17 9600 bps short
	+FRH=121	V.17 12000 bps long
	+FRH=122	V.17 12000 bps short
	+FRH=145	V.17 14400 bps long
	+FRH=146	V.17 14400 bps short
5.3.	EXAMPLES
Examples of calling (transmitting) and answering (receiving) one page
using fax class 1 commands are shown in Tables 5-2 and 5-3, respectively. 


Table 5-2.	Fax Class 1 Calling Sequence (One Page)
	DTE Commands	DCE Responses	
	(Host)	(Modem)	Remote Fax	Notes
	(1)	AT+FCLASS=1	(2)	OK			Set to Class 1
	PHASE A
	(3)	ATDT6163	(4)	Dials	(5)	Answers	+FRH=3 implied by
Dialing
			(6)	CONNECT	(7)	Send HDLC flags
	PHASE B
						(8)	Send NSF frame
			(9)	<NSF>,OK
	(10)	AT+FRH=3	(11)	CONNECT
					(12)	Send CSI frame
			(13)	<CSI>,OK
	(14)	AT+FRH=3	(15)	CONNECT
					(16)	Send DIS frame	Last frame bit = 1
			(17)	<DIS>,OK	(18)	Drop carrier
	(19)	AT+FTH=3	(20)	Send HDLC flags	(21)	Receive flags
			(21)	CONNECT
	(22)	<TSI>	(23)	Send TSI frame	(24)	Receive TSI	Last
frame bit = 0
			(25)	CONNECT
	(26)	<DCS>	(27)	Send DCS frame	(28)	Receive DCS	Last
frame bit = 1
			(29)	Detect last frame bit
			(39)	OK, drop carrier
	(31)	AT+FTS=8	(32)	OK, wait 80 ms
	(33)	AT+FTM=96	(34)	Send V.29
			(35)	CONNECT
	(36)	<TCF>	(37)	Send TCF data	(38)	Receive & check
			(39)	OK
	(40)	AT+FRH=3	(41)	CONNECT
			(42)	Send CFR frame		Last frame bit = 1
	(43)	<CFR>,OK	(44)	Drop carrier
			(45)	OK
	PHASE C
	(46)	AT+FTM=96	(47)	Send V.29
			(48)	CONNECT
	(49)	age data	(50)	Send page data	(51)	Receive data
			(52)	OK
	(53)	AT+FTH=3	(54)	Send HDLC flags	(55)	Receive flags
			(56)	CONNECT
	PHASE D
	(57)	<EOP>	(58)	Send EOP frame	(59)	Receive EOP	Last
frame bit = 1
			(60)	OK, drop carrier
	(61)	AT+FRH=3	(62)	CONNECT
					(63)	Send MCF frame	Last frame bit = 1
			(64)	<MCF>, OK
	(65)	AT+FTH=3	(66)	Send HDLC flags	(67)	Receive flags
			(68)	CONNECT
	(69)	<DCN>	(70)	Send DCN frame	(71)	Receive DCN	Last
frame bit = 1
			(72)	OK, drop carrier
	PHASE E
	(73)	ATH0	(74)	OK, hang up	(75)	Hang up

Table 5-3.	Fax Class 1 Answering Sequence (One Page)
	DTE Commands	DCE Responses		
	(Host)	(Modem)	Remote Fax	Notes
	(1)	AT+FCLASS=1	(2)	OK			Set to Class 1
	PHASE A
					(3)	FAX machine dials
			(4)	RING
	(5)	ATA	(6)	Modem answers
			(7)	Send HDLC flags	(8)	Receive flags	+FTH=3
implied by
							answering
			(9)	CONNECT
	PHASE B
	(10)	<NSF>	(11)	Send NSF frame	(12)	Receive NSF	Last
frame bit = 0
			(13)	CONNECT
	(14)	<CSI>	(15)	Send CSI frame	(16)	Receive CSI	Last
frame bit = 0
			(17)	CONNECT
	(18)	<DIS>	(19)	Send DIS frame 	(20)	Receive DIS	Last frame bit =
1
			(21)	OK, drop carrier
	(22)	AT+FRH=3	(23)	CONNECT
					(24)	Send TSI frame	Last frame bit = 0
			(25)	<TSI>, OK
	(26)	AT+FRH=3	(27)	CONNECT
					(28)	Send DCS frame	Last frame bit = 1
			(29)	<DCS>, OK	(30)	Drop Carrier
	(31)	AT+FRM=96
					(32)	Send V.29
			(33)	CONNECT	(34)	Send TCF frame
			(35)	<TCF>	(36)	Drop carrier
			(37)	NO CARRIER
	(38)	AT+FTH=3	(39)	CONNECT
	(40)	<CFR>	(41)	Send CFR frame	(42)	Receive CFR	Last
frame bit = 1
			(43)	OK, drop carrier
	PHASE C
	(44)	AT+FRM=96
					(45)	Send page data
			(46)	<page data>	(47)	Drop carrier
			(48)	NO CARRIER
	PHASE D
	(49)	AT+FRH=3	(50)	CONNECT
					(51)	Send EOP frame	Last frame bit = 1
			(52)	<EOP>, OK
	(53)	AT+FTH=3	(54)	CONNECT
	(55)	<MCF>	(56)	Send MCF frame	(57)	Receive MCF	Last
frame bit = 1
			(58)	OK, drop carrier
	(59)	AT+FRH=3	(60)	CONNECT
					(61)	Send DCN frame 	Last frame bit = 1
			(62)	<DCN>, OK
	PHASE E
	(73)	ATH0	(74)	OK, hang up	(75)	Hang up	
   

6.	FAX CLASS 2 COMMANDS
The fax class 2 commands are summarized in Table 6-1.
6.1.	COMMAND SYNTAX AND GUIDELINES
6.1.1.	DTE Commands
The ISO 646 character set (CCITT T.50 International Alphabet 5, American
Standard Code for Information Interchange) is used for the issuance of
commands and responses. Only the low-order 7 bits of each character are
used for commands or parameters; the high order bit is ignored. Upper case
characters are equivalent to lower case characters.
For Phase C data transmission or reception, all 8 bits are needed.
DTE Command Lines
A command line is a string of characters sent from a DTE to the modem
(DCE) while the modem is in a command state. A command line has a prefix,
a body, and a terminator. Each command line (with the exception of the A/
command) must begin with the character sequence AT and must be terminated
by a carriage return. Commands entered in upper case or lower case are
accepted, but both the A and T must be of the same case, i.e., "AT" =
ASCII 065, 084 or ÒatÓ = ASCII 097, 116. The body is a string of commands
restricted to printable ASCII characters (032 - 126). Space characters
(ASCII 032) and control characters other than CR (ASCII 013) and BS (ASCII
010) in the command string are ignored. The default terminator is the
ASCII <CR> character. Characters that precede the AT prefix are ignored.
The command line interpretation begins upon receipt of the carriage return
character.
Facsimile Command Syntax
After the "AT" or "at" prefix, facsimile commands use extended syntax.
Each command is preceded by the Ò+FÓ character and consists of single
characters and a decimal parameter (if applicable) terminated by the
semicolon Ò:Ó character (ASCII 059) or by the <CR> that terminated the
command line. A missing decimal parameter is evaluated as 0. 
For example, the command to instruct the modem to automatically answer a
data or fax call and also enable reception is:
AT+FAE=0; +FCR 1 <CR>
Basic data mode and fax service class mode select commands are:
AT+FCLASS=0 <CR>	for Data Mode
AT+FCLASS=1 <CR>	for Service Class 1 Fax
AT+FCLASS=2 <CR>	for Service Class 2 Fax
In Class 2, the DCE makes and terminates calls, manages the communication
session and negotiates (T.30 protocol) and transports the image date to
DTE. The T.4 protocol management of image data, etc., is done by DTE.
The response to 
AT+FCLASS= 0<CR>	in Data Mode
or
AT+FCLASS=2<CR>	in Service Class 2 Fax
is
OK
The service class may be set by the DTE from the choices available using
the Ò+FCLASS=<VALUE>Ó command.
General Rules
1.	+Fnnn commands must be entered completely, otherwise an ERROR response
is sent.
2.	All response messages are preceded and followed by <CR><LF>. Multiple
response commands (e.g., +FDIS: +FCSI: and +FDCS:) will, therefore, appear
to a have a blank line between them.
3.	Fax Class 2 commands can be separated by the Ò:Ó character. The Ò;Ó
character can be omitted if desired. Note that non-data commands cannot be
separated by the Ò;Ó which is allowed as a dial modifier. 

Table 6-1.	Fax Class 2 Commands
Command	Function
Service Class ID	
+FCLASS=	Service Class
Class 2 Action Commands	
D	Originate a Call
A	Answer a Call
+FDT	Data Transmission
+FET=N	Transmit Page Punctuation
+FDR	Begin or Continue Phase C Receive Data
+FK	Session Termination
Class 2 DCE Responses	
+FCON	Facsimile Connection Response
+FDCS:	Report Current Session
+FDIS:	Report Remote Identification
+FCFR	Indicate Confirmation to Receive
+FTSI:	Report the Transmit Station ID
+FCSI:	Report the Called Station ID
+FPTS:	Page Transfer Status
+FET:	Post Page Message Response
+FHNG	Call Termination with Status
Class 2 Session Parameters	
+FMFR?	Identify Manufacturer
+FMDL?	Identify Model
+FREV?	Identify Revision
+FDCC=	DCE Capabilities Parameters
+FDIS=	Current Sessions Parameters
+FDCS=	Current Session Results
+FLID=	Local ID String
+FCR	Capability to Receive
+FPTS=	Page Transfer Status
+FCR=	Capability to Receive
+FAE	Adaptive Answer
+FBUF?	Buffer Size (Read Only)
+FPHCTO	Phase C Time Out
+FAXERR	Fax Error Value
+FBOR	Phase C Data Bit Order




4.	All Class 2 commands are assumed to be the final command on a command
line. Additional characters will be ignored.
5.	An ERROR message will be generated if any of the following conditions
occur:
a.	A Class 1 command is received while in Class 2.
b.	A Class 2 command is received while in Class 1.
c.	A Class 1 or Class 2 action command is received while in data modem
mode.
d.	A Class 2 read-only parameter is given the Ò=Ó form of a +F command
(e.g., AT+FAXERR=5).
e.	A Class 2 action command is given the inappropriate Ò=Ó or Ò=?Ó form
(e.g., AT+FDR=?).
6.1.2.	Serial Port Speed and Flow Control
During fax mode, the DTE-DCE port speed is 19200 bps.
The DCE provides a speed buffer of 1024 bytes and provides the DC1/DC3
(XON/XOFF) or RTS/CTS method of controlling the data into the buffer. This
flow control is controlled by the &K3 or &K4 command.
This method of data flow control is available only for DTE to DCE
direction of data. There is no provision for data flow control from DCE to
DTE.
Data Stream Termination
The DCE exchanges streams of data with the DTE while executing data
transfer commands. These data streams use the termination described in
Section 3.2/ISO 2111.
The ASCII <DLE> character (016) is used as a special character to shield
special characters. The <DLE><ETX> character pair (<106><003>) is used to
mark the end of a stream. The following patterns are used:
any data...<DLE><ETX>	end of stream
any data...<DLE><DLE>	single <DLE> in data
any data...<DLE><any byte>	delete <DLE><any byte>
DTE to DCE Streams
The DCE filters the data stream from the DTE, and removes all character
pairs beginning with <DLE>. The DCE recognizes <DLE><ETX> as the stream
terminator. The DCE recognizes <DLE><DLE> and reinserts a single <DLE> in
its place.
The DTE must filter stream data to the DCE, and insert extra <DLE>
characters ahead of data.
DCE to DTE Streams
The DTE must filter the data stream from the DCE, and remove all character
pairs beginning with <DLE>. The DTE must recognize <DLE><ETX> as the
stream terminator. The DTE must recognize <DLE><DLE> and reinsert a single
<DLE> in its place.
The DCE filters stream data to the DTE, and inserts extra <DLE> characters
ahead of data.
6.1.3.	Auto Answer
The DCE can answer as a data DCE or as a fax DCE. It can answer the call
adaptively, i.e., it can determine whether the call is 'data' or 'fax'.
The +FAA parameter controls this feature.
AT+FAA=1	; Auto answer as a facsimile or a data modem depending on the
call
CONNECT XXXX	; DCE status response if data call
+FCON	; DCE status response if fax call
6.1.4.	Identification of T.30 Options
Group 3 devices negotiate session parameters in DIS, DCS, and DTC frames.
These parameters are defined in Table 6-2.

6.1.5.	Session Status Reporting
The DCE provides reports to the DTE on the status of a session. The DCE
provides the following status reports:
1.	Connection and hang up status:
+FCON
+FHNG:<0-255>
2.	Requested DIS session parameters +FDIS: <string> reports remote
facsimile capabilities.
Syntax: +FDIS: VR, BR, WD, LN, DF, EC, BF, ST
3.	+FDCS: <string> reports the negotiated parameters
4.	Phase C prompts:
XON, XOFF, DC2
5.	Phase C base status reports: depending upon copy quality and related
end-of page status:
+FPTS: <1-5>
6.1.6.	Procedure Interrupt Negotiation
CCITT allows a station to request a procedure interruption at the end of a
page. This request is passed between stations by the PIP, PIN, and PRI-Q
messages.
6.2.	SERVICE CLASS 2 IDENTIFICATION AND SELECTION
Three commands report identification and selection information. Each of
these three commands cause the DCE to send a message to the DTE. The
messages are programmable using ConfigurACE.
6.2.1.	+FMFR?, Request Manufacturer Identification 
The +FMFR? command causes the DCE to send a message identifying the DCE
product manufacturer. The default message is:
ROCKWELL
OK
6.2.2.	+FMDL?, Identify Product Model 
The +FMDL? command causes the DCE to send a message identifying the DCE
product model. The default message is similar to:
RC96XXXAC
OK
6.2.3.	+FREV?, Identify Product Revision 
The +FREV? command causes the DCE to send a message identifying the DCE
product model revision number. The message format is the same as the ATI3
message, e.g.:
VX.XXX-model number
OK
6.3.	SERVICE CLASS 2 ACTION COMMANDS
These commands transfer data, and punctuate sessions. They also release
specific T.30 messages. All action commands must be the last command on a
command line as indicated by the terminating <CR>.
All action commands initiate processes. The modem will not accept other
commands from the DTE until the modem issues a final result code (e.g.,
OK, CONNECT). The modem will abort the process if it receives any
character before the final result code is issued.

6.3.1.	ATD, Originate a Call
Syntax:	ATD....<CR>
The DCE can support a DTE command to originate a call using the ATD
command (see Section 3.2).
If this command is unsuccessful, the DCE reports an appropriate failure or
error type result code such as NO CARRIER, NO DIALTONE, or BUSY (see
Section 3.3).
If this call is successful, the typical DCE response is:
ATDnn..nn	(go off-hook, dial, get CED)
+FCON	(DCE detects flags)
[+FCSI:<remote ID string>]
+FDCS:<T.30 subparameter string>
OK
The DCE dials, detects call progress, and generates the CNG tone. It then
waits for a DIS frame. On detection of the first Phase B preamble (V.21
ch. 2 modulated by 300 bps HDLC flags), it reports the Ò+FCONÓ message to
the DTE. The DCE then switches to 19200 bps.
The DCE generates a DCS frame based on the received DIS frame and on the
previously set +FDIS parameter. A +FDT command from the DTE releases the
DCE to transmit that DCS frame.
The DCE reports the initial received T.30 negotiation messages, including
the DIS frame and the optional CSI ID string. The +FDIS: report is
followed by the OK final result code.
6.3.2.	ATA, Answer a Call
The DCE can support a DTE command to answer an incoming call using the ATA
command (see Section 3.2). 
The DTE may issue an Answer command in response to an incoming ring.
If the Answer command is unsuccessful, the DCE will report an appropriate
failure or error type result code, such as NO CARRIER (see Section 3.3).
Manual Call Answer
If this call is successful, the typical DCE response (answer and receive)
is:
+FCON
[+FTSI:<remote ID string>]
+FDCS:<T.30 subparameter string>
OK
(DTE should issue +FDR command here)
Upon receipt of an Answer command from the DTE, the DCE answers and
generates the CED tone. The DCE then generates a DIS frame (derived from
the +FDIS parameter) and hunts for the first T.30 negotiation frames. Upon
detection of the first Phase B preamble (V.21 ch 2 modulated by 300 bps
HDLC flags), it reports the Ò+FCONÓ message to the DTE.
The DTE should report the initial received T.30 negotiation messages,
including the DCS frame. The +FDCS: report will be followed by the OK
final result code.
Automatic Answer
The modem provides for automatic answering of incoming calls. If
configured for automatic answer, the modem answers an incoming call in
compliance with T.30, and reports the same messages as described for
manual answer.
Connection as a Data Modem
If configured to do so by the +FAA parameter, the DCE will adaptively
answer as a facsimile DCE or as a data DCE. If the DCE answers as a data
DCE, it resets the +FCLASS parameter to 0 and issues the appropriate final
result code (e.g., CONNECT, or NO CARRIER) to the DTE.

6.3.3.	+FDT, Data Transmission
Syntax: 	+FDT <CR>
The +FDT command prefixes Phase C data transmission. When the DCE is ready
to accept Phase C data, it issues the negotiation responses and the
CONNECT result code to the DTE.
In Phase B, the +FDT command releases the DCE to proceed with negotiation,
and releases the DCS message to the remote station. In Phase C, the +FDT
command resumes transmission after the end of a prior transmit data
stream.
Initiate Page Transmission
Phase B DCE polled response:
[+FCSI:<remote ID string>]	- if new CSI received
[+FDIS:<subparameters from remote station>]
	- if new DIS received
+FDCS:<T.30 subparameter string>
CONNECT
<XON>	- when ready for data
After placing a call, or after finishing a document exchange, the DTE may
command the DCE to re-enter T.30 Phase B to attempt to negotiate a
document transmission.
Continue a Page
CONNECT
<XON>
The DTE may issue more than one +FDT command for a given page, so that
different files may be concatenated together. These files must have the
same format.
Phase C Data Framing
Phase C data must be presented to the DCE in stream mode. The DCE expects
Phase C data to follow until it detects <DLE><ETX> termination characters.
The DCE will filter the stream as described in Section 6.1.2. 
The DCE will acknowledge the end of the data by returning the OK result
code to the DTE.
If there is data underrun before the next +FDT or +FET= command, the DCE
will zero-fill the pad as per T.4 until the Phase C timeout (+FPHCTO) is
reached, or until more data is received. The DCE appends an RTC pattern to
the transmit data after an +FET= command is received from the DTE.
Phase C Data Format
The Phase C data will be of the format specified by the negotiated T.30
DCS frame. The +FDCS:<string> response is defined in Section 6.4.2. The
subparameter values are described in Table 6-2.
The DCE will use the negotiated minimum Scan Time parameter from the DCS
frame, and insert sufficient fill bits to pad each line to the minimum
scan time. This is reported in the +FDCS:ST subparameter.
If the DCE finds more than one consecutive EOL in Phase C data (e.g.,
RTC), it will send only one EOL.
1.	Phase C data must conform to T.4 specifications.
2.	The DTE need not include a final RTC, since the DCE will append an RTC
in response to an FET= command.
3.	Some facsimile machines may treat two EOLs as an RTC.
<CAN>, Escape from Transmission
The DCE may request the DTE to halt Phase C transmission, by sending a
cancel <CAN> character (024) to the DTE. In this case, the DTE should
terminate Phase C transmission, issue <CAN>, and wait for the OK response
code from the DCE.

Table 6-2.	T.30 Session Subparameter Codes
Label	Function	Value	Description	
VR	Vertical Resolution	0	Normal, 98 lpi	
		1	Fine, 196 lpi	
BR	Bit Rate (See Note 1)		+FDCS (originate)	+FDIS (answer)
		0	2400 bps/V.27 ter	V.27 ter (2400 only)
		1	4800 bps/V.27 ter	V.27 ter 
		2	7200 bps/V.29 	V.29, V.27 ter
		3	9600 bps /V.29 or V.17	V.29, V.27 ter
		4	12000 bps/V.33 or V.17	V.17, V.33, V.29, V.27 ter
		5	14400 bps/V.33 or V.17	V.17, V.33, V.29, V.27 ter
WD	Page Width	0	1728 pixels in 215 mm	
		1	2048 pixels in 255 mm	
		2	2432 pixels in 303 mm	
		3*	1216 pixels in 151 mm	
		4*	864 pixels in 107 mm	
LN	Page Length	0	A4, 297 mm	
		1	B4, 364 mm	
		2	unlimited length	
DF	Data Compression Format	0	1-D modified Huffman	
		1*	2-D modified Read	
		2*	2-D uncompressed mode	
		3*	2-D modified modified Read	
EC	Error Correction 	0	Disable ECM	
	(Annex A/T.30)	1*	Enable ECM, 64 bytes/frame	
		2*	Enable ECM, 256 bytes/frame	
BF	Binary File Transfer	0	Disable BFT	
		1*	Enable BFT	
ST	Scan Time/Line		VR = normal	VR = fine
		0	0 ms	0 ms
		1	5 ms	5 ms
		2	10 ms	5 ms
		3	10 ms	10 ms
		4	20 ms	10 ms
		5	20 ms	20 ms
		6	40 ms	20 ms
		7	40 ms	40 ms
Notes: 	1.	CCITT T.30 does not provide for the answering station to
specify all speeds exactly using the DIS frame. Implementation of some BR
codes (e.g., code 2) by an answering DCE is manufacturer specific.
* Not supported.				


6.3.4.	+FET, Transmit Page Punctuation
Syntax:	+FET=<ppm>[,<pc>,<bc>,<fc>]
DCE response:
+FPTS:<ppr> 	- when receive from remote OK
This command is used to punctuate page and document transmission after one
or more +FDT commands. This command generates T.30 Post Page Messages
selected by the <ppm> code (Table 6-3).
The +FET=<ppm> command indicates that the current page is complete; no
more data will be appended to it. The value indicates whether there are
any additional pages are to be sent and, if so, whether there is a change
in any of the document parameters.
The DTE can command the DCE to generate PRI-Q messages with the +FET=<ppm>
command using ppm codes 4-6 (see Table 6-3).
This command must be sent within the time out specified by +FPHCTO after
sending Phase C data, or else the DCE will end the page and document
transmission. If the Phase C timeout is reached, the DCE sends an EOP post
page message and terminates the session.
The remote facsimile station should respond to the post page message with
a post page response. The DCE will report this using the +FPTS:<ppr>
response (Table 6-4).
End a Page
The +FET= command causes the DCE to append an RTC (6 EOL) pattern as
needed and enter Phase D by sending the selected T.30 Post Page message.
The +FET=1 (EOM) command signals the remote station that the next document
will have a new DCS negotiated; this causes the session to re-enter Phase
B.

Table 6-3.	T.30 Post Page Message Codes
ppm Code	Mnemonic	Description
0	[PPS-]MPS	Another page next, same document
1	[PPS-]EOM	Another document next
2	[PPS-]EOP	No more pages or documents
3	PPS-NULL	Another partial page next
4	[PPS-]PRI-MPS	Another page, procedure interrupt
5	[PPS-]PRI-EOM	Another doc., procedure interrupt
6	[PPS-]PRI-EOP	All done, procedure interrupt
=8+ppm		Post Page Message (ppm code)


Table 6-4.	T.30 Post Page Response Messages
ppr Code	Mnemonic	Description
1	MCF	Page good
2	RTN	Page bad; retrain requested
3	RTP	Page good; retrain requested
4	PIN	Page bad; interrupt requested
5	PIP	Page good; interrupt requested



6.3.5.	+FDR, Begin or Continue Phase C Receive Data 
Syntax:	+FDR <CR>
Default value:	3 seconds in some places
The +FDR command initiates transition to Phase C data reception. This can
occur after answering, dialing, a document is received, or a page is
received.
The DCE reports the negotiated T.30 parameters, with the remote ID
information if available. When the DCE is ready to commence data transfer,
it issues a CONNECT response code. If the DCE cannot resume data transfer
because there is no more data, it responds OK. When the DTE is ready to
accept data, it issues an <DC2> character (018) to the DCE.
If the DTE issues an <XOFF> character to the DCE for flow control, the DCE
signals the DTE when its buffers are empty by sending a <DLE><DC2>
(<016><018>) character pair. 
When the DCE delivers the last byte of a page, the DCE reports the Page
Transfer Status via the +FPTS:<ppr> response (Table 6-4).
After a Page Transfer Status Report, the DCE reports the post page message
from the remote facsimile station via the +FET:<ppm> response (Table 6-3)
which signals the intentions of the remote station. 
The DCE holds the post page response message to the remote facsimile
station (MCF, etc.), represented in the +FPTS parameter until the next
+FDR command. The DTE may modify the +FPTS parameter before issuing the
+FDR command which releases that message. The DTE must issue a +FDR
command to release Post Page Messages.
Initiate Document Reception 
The +FDR command may be issued in Phase B after an answer command, or in
Phase B after a previous document.
The DCE response in stream mode is:
+FCFR 	 when CFR sent
[+FTSI:<remote ID string>]	 if new TSI received
+FDCS:<T.30 subparameter string>]	 if new DCS
CONNECT
(<DC2> needed from DTE here)
<Phase C data stream>
<DLE><ETX>
+FPTS:<ppr>, <lc> [,<blc>, <cblc>]
+FET:<ppm>
OK
(DTE must issue +FDR command to release post page response)

Continue Document Reception
The DTE may issue a +FDR command in Phase D, which releases the post page
message, and indicates readiness to receive another page after receipt of
a Multipage (+FET:0) or PPS-NULL (+FET:3) message. The DCE response will
be:
CONNECT
(<DC2> needed from DTE here)
<Phase C data stream)
<DLE><ETX>
+FPTS:<ppr>, <lc> [,<blc>, <cblc>]
+FET:<ppm>
OK
(DTE must issue +FDR command to release post page response)
If done receiving:
+FHNG: <hangup cause code>
OK

Continue page reception
Phase C Data Framing
Phase C data may be presented to the DTE in stream mode. The DCE will
transfer a stream of data to the DTE, followed by the <DLE><ETX> stream
termination characters. The DCE will filter the stream as described in
Section 6.1.2.
Phase C Data Format
The received data format is negotiated under T.30 reported by the
+FDCS:VR,BR,WD,LN,DF,EC,BF,ST response.
The DCE will delete the terminating RTC (6 EOLs) patterns. 
<CAN>, Escape from Reception
From the +FDR command until the end of Phase D Date, the DCE is in a data
transfer state, and will not respond to DTE command characters. The DCE
will respond to three ASCII control characters: <DC1> (017) and <DC3>
(019) flow control characters, and cancel <CAN> (024).
Upon receipt of the <CAN> character, the DCE will terminate the reporting
of received data by sending trailing <DLE><ETX> characters to the DTE, and
will then execute an implied +FK command in order to conduct an orderly
disconnection.
6.3.6.	+FK, Session Termination
Syntax:	+FK
The +FK command causes the DCE to terminate the session in an orderly
manner. In particular, the DCE will send a DCN message at the next
opportunity and hang up. At the end of the termination process, the DCE
will report the +FHNG response with result code (Table 6-5).
This operation can be invoked by using the cancel <CAN> character during
Phase C data reception (see prior section)
The DCE will wait until the current page completes, unless the reception
is of unlimited length; in that case, the DCE may halt reception and
terminate the session at any time.

6.3.7.	+FCIG, Set Polling ID
This command allows setting the Local Polling ID string used in a CIG
frame. The syntax of this command is identical to +FLID.
Write syntax:	+FCIG="<local ID string>"
Valid value:	20-character ASCII string
Default value:	Empty
6.3.8.	+FLPL, Indicate a Document for Polling
This command allows setting up an answering modem to know that it has a
document available for polling. This allows a calling modem to receive
this fax from the answerer. The syntax is:
AT+FLPL=?
0,1

OK
AT+FLPL=1

OK
AT+FLPL?
1
6.3.9.	+FSPL, Enable Polling
This command allows setting up an originating modem to be able to request
to receive a document from a polled station. The syntax is:
AT+FSPL=?
0,1

OK
AT+FSPL=1

OK
AT+FSPL?
1

Table 6-5.	Hang Up Status Codes
Code	Cause Description
0-9	Call Placement and Termination
0	Normal and proper end of connection
1	Ring Detect without successful handshake
2	Call aborted, from +FK or AN
3	No Loop Current
10-19	Transmit Phase A & Miscellaneous Errors
10	Unspecified Phase A error
11	No Answer (T.30 T1 timeout)
20-39	Transmit Phase B Hangup Codes
20	Unspecified Transmit Phase B error
21	Remote cannot receive or send
22	COMREC error in transmit Phase B
23	COMREC invalid command received
24	RSPEC error
25	DCS sent three times without response
26	DIS/DTC received 3 times; DCS not recognized
27	Failure to train at 2400 bps or +FMINSP value
28	RSPREC invalid response received
40-49	Transmit Phase C Hangup Codes
40	Unspecified Transmit Phase C error
43	DTE to DCE data underflow
50-69	Transmit Phase D Hangup Codes
50	Unspecified Transmit Phase D error
51	RSPREC error
52	No response to MPS repeated 3 times
53	Invalid response to MPS
54	No response to EOP repeated 3 times
55	Invalid response to EOP
56	No response to EOM repeated 3 times
57	Invalid response to EOM
58	Unable to continue after PIN or PIP
70-89	Receive Phase B Hangup Codes
70	Unspecified Receive Phase B error
71	RSPREC error
72	COMREC error
73	T.30 T2 timeout, expected page not received
74	T.30 T1 timeout after EOM received
90-99	Receive Phase C Hangup Codes
90	Unspecified Receive Phase C error
91	Missing EOL after 5 seconds
92	Unused code
93	DCE to DTE buffer overflow
94	Bad CRC or frame (ECM or BFT modes)
100-119	Receive Phase D Hangup Codes
100	Unspecified Receive Phase D errors
101	RSPREC invalid response received
102	COMREC invalid response received
103	Unable to continue after PIN or PIP
120-255	Reserved Codes
Note: Some codes are not implemented.	
6.4.	SERVICE CLASS 2 DCE RESPONSES
The DCE sends information responses to the DTE as a facsimile session
proceeds. They indicate the state of the facsimile session and convey
needed information. These messages are solicited messages generated in
execution of DTE action commands described in Section 6.3.
The DCE precedes and follows the information responses with <CR><LF>.
The DCE provides the on-line status of several session parameters when
they are available during T.30 handshaking. These include the remote ID
string and the DIS/DCS parameters. These responses report the T.30 session
parameter frames. The subparameters are described in Table 6-2.
6.4.1.	+FCON, Facsimile Connection Response 
+FCON indicates connection with a fax machine. It is released by detection
of HDLC flags in the first received frame. +FCON is generated in response
to an Originate or Answer command.
6.4.2.	+FDCS:, Report Current Session Capabilities
Syntax:	+FDCS:VR,BR,WD,LN,DF,EC,BF,ST
+FDCS:<string> reports the negotiated parameters. Phase C data will be
formatted as described by the subparameters. This message may be generated
in execution of +FDT or +FDR commands before the CONNECT result code if
new DCS frames are generated or received. (See Table 6-2.)
6.4.3.	+FDIS:, Report Remote Station Capabilities 
Syntax:	+FDIS:VR,BR,WD,LN,DF,EC,BF,ST 
+FDIS:<string> reports remote facsimile station capabilities and
intentions. The parameters are provided in ASCII notation. (See Table
6-2.)
This message is generated in execution of Originate, Answer, +FDT, or +FDR
commands.
6.4.4.	+FCFR, Indicate Confirmation to Receive 
Syntax:	+FCFR
The DCE sends a +FCFR response to the DTE upon reception of an acceptable
TCF training burst and a valid DCS signal from the remote machine. This
indicates that the DCE will receive Phase C data after the remote station
receives the local DCE's CFR message. The +FCFR message is generated in
execution of a +FDR command.
6.4.5.	+FTSI:, Report the Transmit Station ID
Syntax:	+FTSI: Ò<TSI ID string>Ó Transmit Station ID
This response reports the received transmit station ID string, if any.
This message is generated in execution of Originate, Answer, +FDT, or +FDR
commands.
6.4.6.	+FCSI:, Report the Called Station ID
Syntax:	+FCSI: Ò<CSI ID string>Ó Called Station ID
This response reports the received called station ID string, if any. This
message is generated in execution of Originate, Answer, +FDT, or +FDR
commands.

6.4.7.	+FPTS:, Receive Page Transfer Status
Syntax:	+FPTS:<ppr>, <lc> [,<blc>, <cblc>]
The +FPTS:<ppr> is generated by the DCE at the end of Phase C data
reception in execution of a +FDR command.
The <ppr> is generated by the DCE; it depends on the DCE capabilities at
T.4 error checking. See Table 6-4 for <ppr> values.
The receiving DCE will count the lines. These values are;
<lc> = line count
<blc = bad line count
<cblc> = <consecutive bad line count
A receiving DTE may inspect <ppr> and write a modified value into the
+FPTS parameter. The DCE will hold the corresponding Post Page Response
message until released by a +FDR command from the DTE.
6.4.8.	+FET:, Post Page Message Response
Syntax:	+FET:<ppm>
The +FET:<post page message> response is generated by a receiving DCE
after the end of Phase C reception on receipt of the post-page message
from the transmitting station. The +FET:<ppm> response is generated in
execution of a +FDR command. The <ppm> codes respond to the T.30 post page
messages (Table 6-3).
6.4.9.	+FPTS:, Transmit Page Transfer Status
Syntax:	+FPTS:<ppr>
The +FPTS: response reports a <ppr> number representing the copy quality
and related post-page message responses received from the remote DCE. The
valid <ppr> values are defined in Table 6-4.
The +FPTS:<ppr> response is generated in execution of a +FET=<ppm>
command.
6.4.10.	+FHNG:, Call Termination with Status
Syntax:	+FHNG:<hangup status code>
+FHNG indicates that the call has been terminated. The hangup cause is
reported and stored in the +FAXERR parameter for later inspection. The
<hangup status code> values are described in Table 6-5.
+FHNG:<hsc> is a possible intermediate result code to any DTE action
command described in Section 6.3. It is always followed by the OK final
result code.
Upon termination of a call, the DCE determines the cause of termination
and reports it as part of the FHNG:<hsc> response. It also stores this
<hsc> code in the +FAXERR parameter for later inspection.
The hangup values are organized according to the phases of the facsimile
transaction as defined by T.30. In the Figure A/T.30 flow charts, there
are decision boxes labelled ÒCommand Received?"; this is referred to as
COMREC in the table. Similarly, decision boxes labelled `Response
Received?' are referred to as RSPREC in the table. A COMREC error or
RSPREC error indicates that one of two events occurred: 1) a DCN
(disconnect) signal was received, or 2) an FCS error was detected and the
incoming signal was still present after 3 seconds. (See Figure A/T.30).
The table values are in decimal notation. Leading zero characters are
optional.

6.4.11.	+FCIG:, Report the Polled Station ID
Syntax:	+FCIG: Ò<        ID string>Ó Polled Station ID
This response reports the received transmit station ID string, if any.
This message is generated in execution of Originate, Answer, +FDT, or +FDR
commands.
6.4.12.	+FDTC:, Report the Polled Station Capabilities
Syntax:	+FDTC: Ò<     string>Ó Polled Station Capabilities
If the answerer has a document to poll, it would be communicated to the
originator in bit 9 of the DIS frame. The originating station may elect to
transmit a fax, and later, send SIG and DTC frames to pick up the polled
document. The answering station would report the incoming DTC frame via
the +FDTC: response message after command mode is cancelled with the
AT+FDR command.
6.4.13.	+FPOLL, Indicate Polling Request
Syntax:	+FPOLL: 
This message is sent to the DTE if the received DIS message indicates that
the remote station has a document to poll (by bit 9 in the DIS) and
polling has been enabled with the AT+FSPL command. The DTE may then decide
to receive rather than transmit. 

6.5.	SERVICE CLASS 2 PARAMETERS
All Service Class 2 parameters can be read, written, and tested for range
of legal values by the DCE. The general syntax is described in Section
6.1.
Group 3 FAX devices negotiate session parameters in DIS, DCS, and DTC
frames. The following parameters are provided to condition the facsimile
DCE for the capabilities it will offer and to report the session settings
negotiated.
The three primary T.30 session parameters are +FDCC, +FDIS and +FDCS. They
are compound parameters, using values listed in Table 6-2. Figure 7-1
illustrates their relationships.


Figure 6-1.	T.30 Session Parameter Relationships

6.5.1.	+FDCC, DCE Capabilities Parameters 
Write syntax:	+FDCC=VR,BR,WD,LN,DF,ED,BF,ST
Valid values:	See Table 6-2
Default values:	0,5,0,2,0,0,0,0 
+FDCC allows the DTE to sense and constrain the capabilities of the
facsimile DCE from the choices defined in CCITT T.30 Table 2. When +FDCC
is modified by the DTE, the DCE copies +FDCC into +FDIS.
6.5.2.	+FDIS, Current Sessions Capabilities Parameters
Write syntax:	+FDIS=VR,BR,WD,LN,DF,EC,BF,ST
Valid values:	See Table 6-2
Default values:	0,5,0,2,0,0,0,0 
The +FDIS parameter allows the DTE to sense and constrain the capabilities
used for the current session. The DCE uses +FDIS to generate DIS or DTC
messages directly, and uses +FDIS and received DIS messages to generate
DCS messages.
The DCE initializes the +FDIS parameter from the +FDCC parameter on
initialization, when +FDCC is written, and at the end of a session.

6.5.3.	+FDCS, Current Session Results Parameters
Read syntax:	+FDCS?
DCE response:	+FDCS=VR,BR,WD,LN,DF,EC,BF,ST
	or 	+FDCS=
Valid values:	See Table 6-2.
Default values:	0,0,0,0,0,0,0,0
The +FDCS parameter is loaded with the negotiated T.30 parameters for the
current session. A transmitting DCE generates DCS; a receiving DCE gets
DCS from the remote station. The DTE may read this parameter.
The +FDCS parameter is initialized 0,0,0,0,0,0,0,0 upon initialization and
at the beginning of a session. If the DTE issues a +FDCS? command in the
initial state, the DCE reports:
<CR><LF>0,0,0,0,0,0,0,0<CR><LF>
The contents of +FDCS are spontaneously reported during execution of +FDR
or +FDT commands by the +FDCS:VR,BR,WD,LN,BF,EC,BF,ST response using the
same compound parameter format. 
Several commands and responses reference T.30 session negotiated
parameters. These are described by a set of common subparameters. These
subparameters are described in Table 6-2 with notes. Optional parameter
values are marked with an *. Unspecified parameter values are reserved for
future use.
The +FDCC, +FDIS, and +FDCS compound parameters use these session
parameters (On writes, unspecified subparameters are unchanged.)
The +FDIS:, +FDCS:, and +FDTC: session report responses use these
subparameters.
For test response, ranges of values are reported for each subparameter
enclosed in parentheses characters. For example, a DCE response to +FDCC=?
could report:
<CRLF> (0,1), (0-5), (0-3), (0-2), (0-2), (0-2), (0), (0-7) <CRLF> 
Example:
+FDIS=0,5,0,2,0,0,0,1 =
VR = 0	98 dpi vertical resolution, 
BR = 5	14400 bit/s 
WD = 0	1728 pixels, 
LN = 2	unlimited length
DF = 0	1-D modified Huffman coding, 
EC = 0	no ECM, 
BF = 0	no BFT,
ST = 1	5 ms scan time.

6.5.4.	+FLID=, Local ID String
Write syntax:	+FLID="<local ID string>"
Valid value:	20-character ASCII string
Default value:	Empty
If FLID is not a null string, it generates a TSI or CSI frame. Table
3/T.30 includes digits 0-9, Ò+Ó and space.
If the DCE supports use of Table 3/T.30 only, the response to a +FLID=?
command is Ò(20) (32, 43, 48-57).Ó If the DCE supports printable ASCII <,
the response is: Ò(20) (32-127)<CRLF>.Ó The first Ò(20)Ó represents string
length: the second (character values) field reports supported string
values.
1.	The string is saved in RAM. 
2.	Non-numeric characters are not filtered out.
3.	The string is right justified.
6.5.5.	+FCR, Capability to Receive 
Write syntax:	+FCR=<value>
Valid values:	0 or 1
Default value:	0
+FCR=0 indicates that the DCE will not receive message data. This can be
used when the DTE has insufficient storage. The DCE can send and can be
polled for a file.
+FCR is sampled in CCITT T.30 Phase A and Phase D.
6.5.6.	+FPTS=, Page Transfer Status 
Write Syntax:	+FPTS=<ppr>
Valid values:	1, 2, 3, 4, 5
Default value:	0
The +FPTS parameter contains a value representing the post page response,
including copy quality and related end-of-page status. These values
correspond to post page response messages defined in T.30. The receiving
DCE sets this parameter after it receives a page of Phase C data. The
transmitting DCE sets this parameter with the status reported by the
receiving station. The DTE may inspect or modify this parameter.
The set of <ppr> values is defined in Table 6-4. These values are also
reported in the +FPTS response to the +FDR command.
6.5.7.	+FCQ, Copy Quality Checking
Write syntax:	+FCQ=<value>
Valid values:	0
Default value:	0
This parameter controls Copy Quality checking by a receiving facsimile
DCE.
The DCE returns +FCQ=0 which indicates the DCE does no quality checking.
The DCE will generate Copy Quality OK (MCF) responses to complete pages,
and set +FPTS=1.
6.5.8.	+FPHCTO, DTE Phase C Response Time-out
Write syntax:	+FPHCTO=<value>
Valid values:	0 - 255, 100 millisecond units.
Default value:	30
The +FPHCTO command determines how long the DCE will wait for a command
after reaching the end of data when transmitting in Phase C. When this
time-out is reached, the DCE assumes there are no more pages and no
documents to send. It then sends the T.30 EOP response to the remote
device.
6.5.9.	+FAXERR, T.30 Session Error Report
Read syntax:	+FAXERR= <table value>, read only 
Valid values:	0 - 255, see Table 6-5 for meaning 
This read-only parameter indicates the cause of the hangup. Table 6-5
shows the valid values for this parameter as well as the meaning of the
each value. +FAXERR is set by the DCE at the conclusion of a fax session.
The DCE resets +FAXERR to 0 at the beginning of Phase A off-hook time.
6.5.10.	+FBOR, Data Bit Order 
Write syntax:	+FBOR=<value>
Valid values:	0, 1, 2, or 3
Default value:	0
This parameter controls the mapping between PSTN facsimile data and the
DTE-DCE link. There are two choices:
Direct: The first bit transferred to each byte on the DTE-DCE link is the
first bit transferred on the PSTN data carrier.
Reversed: The last bit transferred of each byte on the DTE-DCE link is the
first bit transferred on the PSTN data carrier.
There are two data types to control:
This command controls Phase C data (T.4 encoded data) transferred during
execution of +FDT or +FDR commands.
The following two codes are supported:
+FBOR=0 or 2	Selects direct bit order for Phase C data.
+FBOR=1 or 3	Selects reversed bit order for Phase C data.
Note that this parameter does not affect the bit order of control
characters generated by the DCE.
6.5.11.	+FAA, Answer Parameter 
Write syntax:	+FAA=<value>
Valid values:	0 or 1
Default value:	0
+FAA=0	Constrains the DCE to answer as set by +FCLASS.
+FAA=1	Indicates that the DCE can answer and automatically determine
whether to answer as a Class 2 facsimile DCE or as a data modem. If the
DCE automatically switches, it modifies FCLASS appropriately.
Class 2 adaptive answer is implemented as follows:
First, a data mode handshake is attempted. If the DCE has been configured
for automode detection (using the +MS command), the DCE may try several
protocols before terminating attempts to make a data mode connection. This
can take as long as 6-8 seconds.
If the data mode connection attempt fails, a facsimile Class 2 connection
is assumed. When a connection is made as a result of the adaptive answer,
the DCE issues the DATA or FAX result code before the CONNECT or +FCON
message to inform the DTE of the connection type. After making a Class 2
connection, the DCE stays on-line rather than going into the command mode
as with a Class 1 connection.

6.5.12.	+FBUF?, Buffer Size
Read syntax:	+FBUF?
DCE response syntax:	<bs>, <xoft>, <xont>, <bc>
where:
<bs> = total buffer size
<xoft> = XOFF threshold
<xcont> = XON threshold
<bc> = current buffer byte count
Example:
+FBUF?
512, 506, 500, 0
The +FBUF parameter allows the DTE to determine the characteristics of the
DCE's data buffer. Data buffers are used for flow control. Use of the
reported values allow the DTE to transfer data without provoking XOFF.
6.6.	EXAMPLE SESSIONS
Tables 6-6 and 6-7 show the typical command and responses for sending and
receiving two pages, respectively.


Table 6-6.	Send Two Pages, 1-D, No Errors
DTE Command	DCE Response	Local DTE Action	Remote Station Action
AT+CLASS=2	OK	Set Class 2	x
AT+FLID="<local ID>"	OK	Set local ID	
AT<dial string>	

+FCON
[+FCSI:"<csi>"]
+FDIS: <dis codes>
OK	Off hook, dial
Send CNG
Detect flags
[Get CSI]
Get DIS	Answer,
Send [CED]
V.21 flags
[CSI]
DIS

AT+FDT





<1st page data>

<DLE><ETX>	

+FDCS:<DCS codes>
CONNECT
<XON>



OK	[Send TSI]
Send DCS
Send TCF
Get CFR
Send carrier

Send page data	[Get TSI]
Get DCS
Get TCF
Send CFR
Receive carrier

Receive page data
AT+FET=0	

+FPTS:1
OK	Send RTC
Get MPS
Get MCF	Get RTC
Get MPS
Send MCF
AT+FDT

<2nd page data>
<DLE><ETX>	CONNECT
<XON>

OK	Send carrier

Send page data	Receive carrier

Receive page data
AT+FET=2	

+FPTS:1
+FHNG:0
OK	Send RTC
Send EOP
Get MCF
Send DCN
Hang up	Get RTC
Get EOP
Send MCF
Get DCN
Hang up



Table 6-7.	Receive Two Pages, 1-D Data, No Errors
DTE Command	DCE Response	Local DTE Action	Remote Station Action
AT+FCR=1	OK	Enable reception	
AT+FLID="<local ID>"	OK	Set local ID	
	 RING	Detect ring	Dials[, Send CNG]
ATA	



+FCON
[+FTSI:"<tsi>"]
+FDCS:<dcs codes>
OK	Off hook
Send CED
Send CSI
Send DIS
Detect flags
[Get TSI]
Get DCS
Begin TCF receive	
Get CED
Get CSI
Get DIS
Send V.21 flags
[Send TSI]
Send DCS
Start TCF
AT+FDR



<DC2>	
+FCFR
[+FDCS:"<dcs codes>]
CONNECT

<page data stream>
<DLE><ETX>
+FPTS:1, <lc>
+FET:0
OK	Accept TCF
Send CFR

Get page carrier
Get page data

Detect RTC

Get MPS	Finish TCF
Get CFR

Send pager carrier
Send page data

Send RTC
Drop carrier
Send MPS
AT+FDR

<DC2>	
CONNECT

<page data stream>
<DLE><ETX>
+FPTS:1, <lc>
+FET:2
OK	Send MCF
Get page carrier
Get page data

Detect RTC

Get EOP	Get MCF
Send page carrier
Send page data

Send RTC
Drop carrier
Send EOP
AT+FDR	
+FHNG:0
OK	Send MCF
Get DCN	Get MCF
Send DCN



7.	VOICE/AUDIO COMMANDS
The modem is configured into Voice Mode (modem models not supporting
business audio) or Voice/Audio Mode (modem models supporting business
audio) in response to the AT #CLS=8 command, and this mode is composed of
the Voice and Audio sub-configurations as described in this section.
Additional voice/audio AT commands are available to support selection of
operational parameters from both inside and outside the Voice/Audio Mode.
a)	Voice Sub-Configuration. Enhanced Adaptive Differential Pulse Code
Modulation (ADPCM) coding and decoding of analog voice is accomplished
with a 7.2 kHz sampling rate and 2 or 4 bits/sample quantization, and
supports efficient compression and decompression of digitized voice.
Optional coder silence deletion and decoder silence interpolation
significantly increase compression rates. Additionally, the Voice
Configuration supports concurrent tone generation/detection capabilities.
b)	Audio Sub-Configuration (Available Only for Modem Models Supporting
Business Audio). Linear PCM coding and decoding of analog audio is
accomplished with 7.2 kHz or 11.025 kHz sampling rates and 8 or 16
bits/sample quantization, and supports superior sound quality as compared
to ADPCM. With a sampling rate of 7.2 kHz, the Audio Sub-configuration
supports concurrent tone generation/detection capabilities. With a
sampling rate of 7.2 kHz or 11.025 kHz, this sub-configuration can be used
to record and playback monophonic data in 8-bit unsigned linear PCM or
16-bit signed linear PCM format. 
Note:	The term "voice" is used to refer to both voice and audio
functions, except where otherwise noted.
The Voice/Audio Mode (i.e., either sub-configuration) supports three
submodes once a voice connection has been established (refer to the
descriptions of the #CLS command): Online Voice Command Mode, Voice
Receive Mode, and Voice Transmit Mode. Determination of whether operation
takes place in the Voice sub-configuration or the Audio sub-configuration
is made by use of the #VBS and #VSR commands (refer to the descriptions of
these commands).
7.1.	VOICE/AUDIO SUBMODES
7.1.1.	Online Voice Command Mode 
Online Voice Command Mode is the default Voice submode entered when the
#CLS=8 command is issued, and may also be entered from Voice Receive Mode
or Voice Transmit Mode. Entry into Online Voice Command Mode is indicated
to the DTE via the VCON message, after which AT commands can be entered
without aborting the telephone line connection.
If the modem is the answerer, it enters Online Voice Command Mode
immediately after going off-hook, and can report instances of DTMF tones
and calling tones to the DTE. If the modem is the originator, it enters
Online Voice Command Mode based on detection of the ringback cadence going
away, upon expiration of the ringback never came timer, or upon detection
of answer tone, and the modem can report DTMF tones, answer tones, busy
tone, and dial tone to the DTE. (Note that DTMF tone reporting is
supported in this mode if DTMF reporting is enabled via the #VTD command.)
When this mode is entered as a result of going off-hook with the D or A
command, VCON is always sent to the DTE, after which the modem accepts
commands. If this mode is entered from Voice Transmit Mode, the DTE has
issued the <DLE><ETX>, and the modem responds with VCON. If this mode is
entered from the Voice Receive Mode because of a key abort, the modem
issues the <DLE><ETX> followed by VCON.
If the #VLS command has switched in a handset or other device in place of
the telephone line, Online Voice Command Mode is immediately entered,
whereas if the telephone line is selected, a physical connection with
another station must occur before entering this mode.
7.1.2.	Voice Receive Mode
Voice Receive Mode is entered when the DTE issues the #VRX command in
order to receive voice data. This typically occurs when either recording a
greeting message, or when recording voice messages from a remote station.
In Voice Receive Mode, voice samples from the modem analog-to-digital
converter (ADC) are sent either to the ADPCM codec for compression, or to
the PCM coder for linear PCM coding, and can then be read by the host. AT
commands control the voice sampling rate as well as codec bits-per-sample
rates, and can also be used to select (optional) silence deletion
including adjustment of the silence detection period and sensitivity level
when ADPCM compression is selected.

In this mode, and when the sampling rate is 7.2 kHz, the modem detects and
reports DTMF, dial tone, and busy tone cadence as enabled by the #VTD
command. Additionally, the modem detects and reports inactivity (periods
of silence) as enabled by the #VSS command. The modem can exit the Voice
Receive Mode only via a DTE Key Abort, or via Disconnect Inactivity timer
(S30) expiration.
7.1.3.	Voice Transmit Mode
Voice Transmit Mode is entered when the DTE issues the #VTX command in
order to transmit voice data. In this mode, when the sampling rate is 7.2
kHz, the modem continues to detect and report DTMF and calling tones if
enabled by the #VTD command. This mode is typically used when playing back
greeting messages or previously received/recorded messages.
In this mode:
a)	If the Voice Sub-configuration is in operation, voice decompression
is provided by the ADPCM codec, and the decompressed ADPCM voice data is
then reconstituted into analog voice by the DAC at the original
compression quantization sample-per-bits rate. Optional silence
interpolation is enabled if silence deletion was selected for voice
compression.
b)	If the Audio Sub-configuration is in operation, PCM decoding is
provided by the linear PCM decoder, and the decoded audio data is then
reconstituted into analog voice by the DAC at the original 1 sample/8 bits
or 1 sample/16 bits rate.
7.2.	VOICE/AUDIO CAPABILITIES
7.2.1.	Call Establishment - Originate
Directed Originate (Dial as a specific modem type)
For most call originations, it is known ahead of time what type of call is
being attempted, and it is acceptable to disconnect if the remote side of
the connection does not cooperate. In this case, the modem can be
configured ahead of time with the existing +FCLASS (and +FAE=0 or +FAA=0)
or the #CLS command to be a data, fax, or voice/audio modem. For Data and
Fax Modes, the modem subsequently either succeeds with the desired type of
connection, or eventually hangs up. For the Voice/Audio Mode, the DTE has
the option of hanging up if there are indications that the remote station
has not answered in voice, thus implementing a directed originate for
voice. The following are the three connection type choices:
Voice/Audio
The modem dials and reports call progress to the DTE, which reduces to
reporting ÒNO DIALTONE", "BUSYÓ, or "NO ANSWER".
The modem allows the DTE to program a time period, which if elapsed after
any ringback is detected, forces the modem to assume the remote has gone
off-hook. A secondary time period (safety valve) can define a maximum
elapsed time after dialing for receiving no ringback before the modem
assumes that the remote has gone off-hook. This safety valve is devised in
case the remote picks up the telephone before any ringback is generated,
and no other tones are detected. In this mode, the modem is attempting to
make a voice connection only and therefore, while waiting for ringback to
disappear, it is also feasible to disconnect upon detection something
which is definitely not voice from the remote, such as any answer tone.
The modem provides detection of Òringback went away or never cameÓ.
Fax
The modem dials and reports call progress to the DTE as in all modes. A
Fax Class 1 or Fax Class 2 handshake is pursued according to the current
configuration.
Data
The modem dials and reports call progress to the DTE as in all modes. A
data handshake is pursued according to the current configuration.
Adaptive Originate (Dial with Voice/Data/Fax Discrimination)
The DTE may wish to originate a call which adapts to the remote answerer.
For instance, the user may wish to send a voice message if a human picks
up the telephone, but a facsimile if a fax machine answers. The modem can
facilitate this type of adaptive originate by extending what it does for
the directed originate modes. After determining that the remote station
has picked up the line, the modem goes back to Online Voice Command Mode,
thus terminating the Òconnecting state.Ó Once in this mode, the modem
reports what it receives from the answerer via specific result codes to
the DTE. The DTE can then have the option of pursuing a data, fax, or
voice/audio connection.

7.2.2.	Call Establishment - Answer
Directed Answer (Answer as a specific modem type)
If the DTE wants to be only one kind of answerer (i.e., voice/audio, fax,
or data), it can configure the modem to answer exclusively in the chosen
mode.
Voice/Audio
The modem is configured to answer in Voice/Audio Mode only and assumes the
caller will cooperate. After going off-hook, the voice VCON is issued, no
answer tone is generated, and the modem is immediately placed in Online
Voice Command Mode. The DTE typically responds by sending a greeting
message of some type, and DTMF tone recognition/reporting can be enabled.
Eventually, an incoming voice message can be recorded by the host.
(Unpredictable results occur if the caller is not prepared for a voice
call.)
Fax
The modem is configured to answer in Fax Class 1 or Fax Class 2 Mode only,
and it assumes the caller is going to cooperate. This configuration has
the effect of disabling Voice/Audio Mode, forcing +FCLASS to either 1 or
2, and forcing both +FAA and +FAE to 0. 
Data
The modem is configured to answer in Data Mode only and assumes the caller
is going to cooperate. This configuration has the effect of disabling
Voice/Audio Mode, forcing +FCLASS = 0, and forcing both +FAA and +FAE to
0.
Adaptive Answer (Answer with Voice/Data/Fax Discrimination)
In normal operation, it is desirable for a modem supporting fax and voice
to provide the ability to discriminate between the two when answering
unsolicited or unattended calls. (It is most often the case that a fax is
received or a voice message recorded when nobody is present.) 
Data/Fax Discrimination
If the DTE wishes to allow for a data or fax call, the +FCLASS and +FAA or
+FAE commands can be configured for adaptive answer between data and Class
1 or Class 2 fax.
Voice/Fax Discrimination
This is the most important discrimination capability needed from the
user's standpoint. The modem must be configured for Voice/Audio (#CLS=8),
causing the modem to enter Online Voice Command Mode immediately upon
going off-hook. In Voice/Audio Mode, the DTE automatically receives
indications of DTMF tones and Calling Tones. The DTE can now switch to
Voice Transmit Mode in order to play a greeting message, perhaps one which
instructs the caller how to enter specific DTMF sequences to switch modes.
The DTE can then react to the response, or the lack thereof, to such a
message. The modem supports switching to Class 1 or Class 2 answer mode by
virtue of the #CLS=1 or #CLS=2 command, and if such a switch is made and
fails, the modem reports the failure but does not hang up, allowing the
DTE further experimentation time. If the user wishes to switch to Class 1
or Class 2, but also wants the DTE to indeed hang up the line if the fax
fails, the +FCLASS command should be used instead of the #CLS command. The
only difference between these commands is that issuing +FCLASS cancels the
modem's memory of voice, whereas #CLS causes the modem to remain off-hook,
even if a fax or data handshake fails, until it receives an H command.
Voice/Data/Fax Discrimination
The DTE can try data modem operation after an answer by changing the #CLS
setting to 0. A data handshake attempt can be added based upon DTMF
responses or lack thereof.

7.2.3.	Voice/Audio Data Transfer
A significant area of concern when handling the transfer of voice/audio
data is the data transfer rate on the modem/DTE interface. Data transfer
rates can be expressed as the number of interrupts which must be serviced
per time period to keep up. This is a function of the sampling rate and
compression method (if any) used by the modem, and the DTE interface speed
required to handle the data flow on the telephone line side.
Tables 7-1a and 7-1b demonstrate the relationship between the sampling
rate, interrupt rate, and DTE speed necessary for the modem to support
various compression ratios. The built-in 16C550A UART-compatible interface
in the MCU hardware operating with MCU firmware incorporating the
Proprietary Rockwell High Speed Interface (RHSI) and an RHSI compatible
communication software driver (RHSICOMM.DRV) in the host computer is
required to support Voice/Audio Mode operation in the Microsoft Windows
environment.
Table 7-1a.	7.2 kHz Sample Rate DTE Speeds
Modem Samples per 8-bit Byte	Required Asynchronous DTE Speed (8N1
Format)	Implied DTE Speed Supported
0.5 (16-bits)	144,000 bps	230.4 kbps 
1 (8-bits)	72,000 bps	115.2 kbps 
2 (4-bits)	36,000 bps	38.4 kbps 
4 (2-bits)	18,000 bps	19.2 kbps

Table 7-1b.	11.025 kHz Sample Rate DTE Speed
Modem Samples per 8-bit Byte	Required Asynchronous DTE Speed (8N1
Format)	Implied DTE Speed Supported
0.5 (16-bits)	220,500 bps	230.4 kbps 
1 (8-bits)	110,250 bps	115.2 kbps 

7.2.4.	Tone and Status Monitoring Ñ Shielded <DLE> Statuses
The modem can detect specific tones and other status information, and
report these to the DTE while in any of the three voice submodes. The
modem simultaneously looks for 1300 and 1100 Hz calling tones when
answering, and for CCITT and Bell answer tones when originating. The modem
can also detect dial or busy tones in any of the three voice submodes. All
detected tones, as well as certain other statuses addressed in Table 7-2
such as silence and Òtelset off-hookÓ (i.e., handset off-hook) are
reported as shielded codes.
When in Online Voice Command Mode or Voice Transmit Mode, the codes in
Table 7-2 are sent to the DTE immediately upon verification by the modem
of the associated tone, status, or cadence. In this mode, the 2-character
code is not buffered, nor does the DTE have the ability to stop the code
with flow control. If the DTE has started (but not completed) sending any
AT command, the Tone Monitoring function is disabled until the command has
been received and processed.
The modem can discriminate between single and multiple DTMF tones
received. If calling tone, dial tone, busy tone, or answer tone is
detected, this detection is reported repeatedly (at reasonable intervals)
if the DTE takes no action, and the tone continues to be detected.

Table 7-2.	Shielded Codes Sent to the DTE
Code Sent to DTE	Meaning
<DLE>0 Ð <DLE>9, <DLE>*, <DLE>#, <DLE>A Ð<DLE>D	DTMF. Digits 0 through
9, *, #, or A through D detected by the modem, i.e., user has pressed a
key on a local or remote telephone. The modem sends only one <DLE> code
per DTMF button pushed.
<DLE>a	Answer Tone (CCITT). Send to the DTE when the V.25/T.30 2100 Hz
Answer Tone (Data or Fax) is detected. If the DTE fails to react to the
code, and the modem continues to detect Answer tone, the code is repeated
as often as once every half second.
<DLE>b	Busy. Sent in Voice Receive Mode when the busy cadence is
detected, after any remaining data in the voice receive buffer. The modem
sends the busy <DLE>b code every 4 seconds if busy continues to be
detected and the DTE does not react. This allows the DTE the flexibility
of ignoring what could be a false busy detection.
<DLE>c	Calling Tone. Sent when the T.30 1100 Hz Calling Tone (Fax Modem)
is detected in any of the voice operating modes. The modem assumes that
the calling tone is valid and sends this code only after 4 seconds of
proper cadence has been detected. If the DTE does not react to the <DLE>c,
and calling tone continues, the code is sent again as often as once every
4 seconds.
<DLE>d	Dialtone. Sent in Voice Receive Mode when dial tone is detected
after any remaining data in the voice receive buffer. The modem sends the
<DLE>d code every 3 seconds if dial tone continues to be detected and the
DTE does not react. This allows the DTE the flexibility of ignoring what
could be a false dial tone detection.
<DLE>e	European Data Modem Calling Tone. Sent when the V.25 1300 Hz
Calling Tone (Data Modem) is detected in a voice submode. The modem
assumes that the calling tone is valid, and sends this code only after 4
seconds of proper cadence has been detected. If the DTE does not react to
the <DLE>e and calling tone continues, the code is sent again as often as
once every 4 seconds. 
<DLE>f	Bell Answer Tone. Sent when Bell 2225 Hz Answer Tone (Data) is
detected. If the DTE fails to react to the code and the modem continues to
detect Answer tone, the code is repeated as often as every 1/2 second.
<DLE>h	Hung Up Handset. Sent immediately when the modem detects that the
local handset has hung-up (i.e., has transitioned from off-hook to
on-hook) while in any of the three voice submodes. 
<DLE>o	Overrun. Sent in Voice Receive Mode if the voice receive data
buffer overflows, in which case, the latest data is lost in favor of
retaining the oldest data in the buffer. (The DTE may not have been
reading data from the modem lately.) The modem inserts the <DLE>o at the
end of the buffer, thus marking the location where data was lost by the
DTE. The modem does not append <DLE>o codes to the buffer contiguously. If
more than one data byte is lost before the DTE begins reading again, there
is only on <DLE>o code in the data stream. However, if the DTE resumes
reading, and then once again allows the buffer to overflow, a new <DLE>o
is appended to the data by the modem. Thus, the <DLE>o does not indicate
how many bytes of contiguous data has been lost, but may report multiple
gaps of lost data in the data stream.
<DLE>q	Quiet. Sent in Voice Receive Mode following any remaining data
in the receive voice buffer when the silence detection timer (#VSP)
expires and there has been voice data passed to the DTE. Note that with
#VSS=0, the Quiet message never occurs. But with silence deletion turned
on, #VSS may not in itself be sufficient since Òcracks and popsÓ for a
short duration directly after a connection should not be considered voice.
In general, <DLE>q is sent if first there was sound, and now there is no
sound, and means that somebody has stopped talking, and according to the
criteria selected in the #VSP and #VSS settings, is probably not going to
start again. If the DTE ignores the <DLE>q code, the modem automatically
resets its timer and sends the code again if the #VSP time period again
expires. This allows the DTE time to react to what may be a false silence
detection.

Table 7-2.	Shielded Codes Sent to the DTE (ContÕd)
Code Sent to DTE	Meaning
<DLE>s	Silence. Sent in Voice Receive Mode after the silence detection
timer (#VSP) expires and if valid voice has not been detected (#VSS). In
general, <DLE>s is sent if no sound was detected at all. This differs
slightly from Quiet (<DLE>q) in that it can be used by the DTE in its
discrimination algorithms as a means of determining if anything at all is
coming from the remote station. If the DTE ignores the <DLE>s code, the
modem automatically resets its timer and sends the code again if the #VSP
time period again expires. This allows the DTE time to react to what may
be a false detection of silence.
<DLE>t	Handset Off-Hook. Sent one time when the local handset transition
from on-hook to off-hook is detected in any of the three voice submodes.
<DLE>u	Underrun. Sent in Voice Transmit Mode when the voice transmit
buffer becomes empty without receiving a <DLE><ETX> or <DLE><CAN> command
first. The modem remains in transmit mode, but issues the <DLE>u to
indicate that silence is being generated. When the DTE resumes sending
bytes, the modem allows a small number of bytes to build up in the buffer
before re-enabling the transmitter to avoid repeated underruns. However,
with the underrun condition, the modem does not wait for the XOFF
threshold (or timer) to be met before resuming, as it does on an initial
transmit or resume operation because the remote listener may be unaware of
the underrun, and keeping the silence short may serve to mask the underrun
altogether.
<DLE>T	Timing Mark. Sent in Voice Receive Mode, and placed in the data
stream at 1 second intervals, when enabled by #VTM = 10.
<DLE><ETX>	End of Stream. <DLE><ETX> is sent to denote the end of a voice
data stream, similar to fax Class 1 and 2. This occurs in Voice Receive
Mode only after the DTE issues the key abort.

7.2.5.	Shielded <DLE> Commands from the DTE
Most commands issued for voice are implemented as extensions to the AT
command set, and are accepted only if the modem is in a valid command
mode, such as Online Voice Command Mode. However, there are some
operations which are available to the DTE without necessitating a switch
to Online Voice Command Mode. The most obvious of these is the <DLE><ETX>
which the DTE issues during Voice Transmit Mode to terminate an output
message. Table 7-3 lists shielded <DLE> commands recognized by the modem.

Table 7-3.	Shielded DTE Codes
Code Sent to Modem	Meaning
<DLE>p	Pause. Sent during Voice Transmit Mode to force the modem to
suspend sending voice data to the selected output device(s). Any data
currently in the voice transmit buffer is saved until either a resume
(<DLE>r), or cancel <DLE><CAN>, is received, in which case the data is
lost. If a <DLE><ETX> is received during the paused state, the modem
processes it normally, and also automatically resumes transmission of the
data left in the buffer (appended with <DLE><ETX>). Any other data
received from the DTE while in this paused state is placed in the transmit
buffer according to available space, with flow control active. (This
command is ignored in other voice submodes.)
<DLE>r	Resume. Sent during Voice Transmit Mode to force the modem to
resume sending voice data to the selected output device(s). Any data
currently in the voice transmit buffer is now played. (This command is
ignored in other voice modes.) The pause and resume commands are different
than a simple suspension of data; data in the buffer is ÒfrozenÓ and not
played when the DTE pauses.
<DLE>E	Purge DCE Buffer. Sent during the transmission or reception of
voice/audio data, by embedding the command in the voice data stream, to
purge the corresponding DCE buffer. (See the <DLE><EOT> code.)
<DLE>u	Increment Playback Volume. Sent during audio mode to increment the
playback volume. The <DLE>u action command allows the application to
increase the playback volume of the headphone and speaker outputs during
playback while in the data state. Each <DLE>u will increment the transmit
level by 1 unit. Adjustment by a value greater than 1 may be achieved by
transmitting a string of <DLE>u codes. For example, a string consisting of
"<DLE>u <DLE>u <DLE>u <DLE>u <DLE>u" increases the playback volume by a
value of 5 units. The <DLE>u code can be used to adjust the volume within
the range of 128-228. (See <DLE><u> and <DLE><d> in Section 7.3.2.)
<DLE>d	Decrement Playback Volume. Sent during audio mode to decrement the
playback volume. The <DLE>d action command allows the application to
decrease the playback volume of the headphone and speaker outputs during
playback while in the data state. Each <DLE>d will decrement the transmit
level by 1 unit. Adjustment by a value greater than 1 may be achieved by
transmitting a string of <DLE>d codes. For example, a string consisting of
"<DLE>d <DLE>d <DLE>d <DLE>d <DLE>d" decreases the playback volume by a
value of 5 units. The <DLE>d code can be used to adjust the volume within
the range of 128-228. (See <DLE><u> and <DLE><d> in Section 7.3.2.)
<DLE><CAN>	Cancel. Sent during Voice Transmit Mode to indicate that the
DTE has finished transmitting a voice message and wants the modem to
discard any remaining data in the voice transmit buffer. The modem
immediately purges its buffer, and then responds with the VCON message
entering Online Voice Command Mode. (This command is ignored by the modem
when not in Voice Transmit Mode.)
<DLE><EOT>	Voice Bytes Buffered Query. Sent during the transmission or
reception of voice/audio data, by embedding the command in the voice data
stream, to learn the number of corresponding bytes buffered by the DCE at
the moment the <DLE><EOT> command is received by the DCE.
<DLE>XZBBC=n<DLE> is returned by the DCE, in which "n" represents the
number of bytes buffered as a two byte hexadecimal value.
<DLE><ETX>	Terminate. Sent during Voice Transmit Mode to indicate that
the DTE has finished transmitting a voice message. The modem completes
transmission of any remaining data in the voice transmit buffer before
responding with the VCON message and entering Online Voice Command Mode.
(This command is ignored by the modem when not in Voice Transmit Mode.)


7.2.6.	Voice Record
To effect recording of a message received via a handset or microphone, the
DTE must configure the modem for Voice Mode (#CLS=8), and select the
proper relay setup (#VLS) to instruct the modem whether to use the
auxiliary device. The modem responds to the #VLS command by issuing a
relay activate command to select the input device. When a device other
than the telephone line is selected, the modem immediately enters Online
Voice Command Mode (indicated by VCON). DTMF detection is therefore
enabled as soon as the DTE selects the device, such as a handset, although
the user still needs to physically pick up the telephone and Òpress
buttons.Ó Even if the DTE has not entered Voice Receive or Transmit Modes
(#VTX or #VRX), these DTMF tones are delivered via shielded codes
identically to when a physical telephone connection exists but the DTE has
not yet commanded receive or transmit.
When the DTE decides to record the message, it issues the #VRX command and
upon command receipt, the modem immediately switches to Voice Receive
Mode. Since the microphone or handset is switched in, the modem
immediately issues the CONNECT message indicating that the modem has
switched to Voice Receive Mode and is beginning the transfer of ADPCM
voice or PCM audio data as well as shielded DTMF tones, and other tones
and statuses.
In this recording state, the modem (if so configured) monitors for line
silence. If the #VSP period expires, the modem sends the <DLE>q or <DLE>s
code to the DTE.
Recording can be canceled only via two events:
1.	The DTE sends any character to the modem. This is the key abort, and
is the normal method of terminating the receive mode.
2.	The S30 Disconnect Inactivity timer expires, which is generally an
undesired event.
7.2.7.	Voice Playback
To effect playback of a message recorded via a handset or microphone, or
of a message recorded during a voice call, the DTE must configure the
modem for Voice Mode (#CLS=8) and select the proper relay setup (#VLS) to
instruct the modem whether to use the handset or speaker. The modem
responds to the #VLS command by issuing a relay activate command to select
the input device. The hardware must provide a means of selecting a handset
and/or microphone instead of the telephone line, as this input device.
When a device other that the telephone line is selected, the modem
immediately enters Online Voice Command Mode (indicated by VCON). DTMF
detection is thus enabled as soon as the DTE selects the device, such as a
handset, although the user still needs to physically pick up the telephone
before he can issue DTMF tones. Once selected, however, the user can
indeed pick up the telephone and Òpress buttons.Ó Even if the DTE has not
entered Voice Receive or Transmit Modes (#VTX or #VRX), these DTMF tones
are delivered via shielded codes, identically to when a physical telephone
connection exists but the DTE has not yet commanded receive nor transmit.
When the DTE decides to play the message, it issues the #VTX command, and
the modem immediately switches to Voice Transmit Mode. Since the speaker
or handset is already switched in, the modem immediately issues the
CONNECT message indicating that the modem is in Voice Transmit Mode and is
expecting voice data from the DTE.
A subsequent <DLE><ETX> has to be issued to switch back to Online Voice
Command Mode.
Volume Adjustment During Record
The record volume is adjusted automatically by an automatic gain control
(AGC) circuit.
Volume Adjustment During Playback
The playback volume of the headphone and speaker outputs can be adjusted
during when a digital potentiometer is connected to the modem device set.
The volume can be adjusted during the command state using the #VGT command
and during the data state using the <DLE>u and <DLE>d commands (see the
#VGT and the DLE>u and <DLE>d descriptions in Section 7.3.2). The handset
playback level can be adjusted by the #TL command in Section 7.3.2). 

7.2.8.	Voice Call Termination
Local Disconnect
The DTE can disconnect from a telephone call by commanding a mode change
to Online Voice Command Mode (if not already in it), and by issuing the H
command.
Remote Disconnect Detection
When in Voice Receive Mode, the modem sends the proper shielded <DLE> code
when dial tone or busy tone is detected. The modem stays in Voice Receive
Mode, however, until the DTE issues a key abort to force Online Voice
Command Mode. The DTE must issue the H command if it wishes to hang up.
7.2.9.	Mode Switching
Voice to Fax
If the modem is in Online Voice Command Mode (i.e., it has gone off-hook
with #CLS=8 in effect), the DTE can attempt a fax handshake by setting
#CLS=1, followed by the A or D command corresponding to fax receive or
send. This has the effect of beginning a fax Class 1 handshake (see #CLS
command).
Unsuccessful Fax Connection Attempt to Voice
A fax handshake which does not succeed, attempted as the result of the DTE
modifying the #CLS setting from voice (8) to fax (1), does not result in
the modem hanging up, allowing the DTE the flexibility of commanding a
switch back to Voice Mode with #CLS=8.
Voice to Data
If the modem is in the Online Voice Command Mode, the DTE can attempt a
data handshake by setting #CLS=0 followed by the A or D command. This has
the effect of beginning a Data Mode handshake according to the current
Data Mode S-register and command settings.
Unsuccessful Data Connection Attempt to Voice
A data handshake which does not succeed, attempted as the result of the
DTE modifying the #CLS setting from voice (8) to data (0), does not result
in the modem hanging up, allowing the DTE the flexibility of commanding a
switch back to Voice Mode with #CLS=8.
7.2.10.	Caller ID
The modem supports Caller ID by passing the information received in Bell
202 FSK modulation to the DTE after the first RING detect. The modem
supports both formatted and unformatted reporting of Caller ID information
received in ICLID (Incoming Call Line ID) format as supported in certain
areas of the U.S. and Canada. The DTE enables this feature via the #CID
command.

7.3.	AT VOICE COMMAND SUMMARY
Table 7-4 provides a complete summary of the AT voice commands described
in detail in Sections 7.3.1 and 7.3.2.

Table 7-4.	AT Voice Commands
Command	Function
A	Answering in Voice/Audio Mode.
D	Dial command in Voice/Audio Mode.
H	Hang up in Voice/Audio Mode.
Z	Reset from Voice/Audio Mode.
#BDR	Select baud rate (turn off autobaud).
#CID	Enable Caller ID detection and select reporting format.
#CLS	Select data, fax, or voice/audio.
#MDL?	Identify model.
#MFR?	Identify manufacturer.
#REV?	Identify revision level.
#TL	Audio output transmit level.
#VBQ?	Query buffer size.
#VBS	Bits per sample (ADPCM or PCM).
#VBT	Beep tone timer.
#VCI?	Identify compression method (ADPCM).
#VLS	Voice line select (ADPCM or PCM).
#VRA	Ringback goes away timer (originate).
#VRN	Ringback never came timer (originate).
#VRX	Voice Receive Mode (ADPCM or PCM).
#VSD	Silence deletion tuner (voice receive, ADPCM).
#VSK	Buffer skid setting.
#VSP	Silence detection period (voice receive, ADPCM).
#VSR	Sampling rate selection (ADPCM or PCM).
#VSS	Silence deletion tuner (voice receive, ADPCM).
#VTD	DTMF tone reporting capability.
#VTM	Enable timing mark placement.
#VTS	Generate tone signals.
#VTX	Voice transmit mode (ADPCM or PCM).

7.3.1.	Global AT Command Set Extensions 
The AT commands in the following section are global, meaning that they can
be issued in any appropriate mode (i.e., any #CLS setting).
For consistency, the command set is divided into action commands and
parameters (non-action commands). Those commands which are action commands
(i.e., those which cause some change in the current operating behavior of
the modem) are identified as such, and the remaining commands are
parameters.

ATA - Answering in Voice/Audio
The answer action command works analogously to the way it works in Data
and Fax Modes except for the following: 
1.	When configured for Voice/Audio Mode (#CLS=8), the modem enters Online
Voice Command Mode immediately after going off-hook. When the #CLS=8
command is issued, the modem can be programmed to look for 1100 and 1300
Hz calling tones (see #VTD), thus eliminating the need to do so as part of
A command processing. After the VCON message is issued, the modem
re-enters Online Voice Command Mode while sending any incoming DTMF or
Calling Tone indications to the DTE as described in Section 7.2.5.
2.	After answering in Voice/Audio Mode (#CLS=8), the DTE, as part of its
call discrimination processing, can decide to change the #CLS setting to
attempt receiving a fax in Class 1, or to make a data connection. In such
a case, the DTE commands the modem to proceed with the data or fax
handshake via the A command even though the modem is already off-hook.
Result Code:
VCON	Issued in Voice Mode (#CLS=8) immediately after going off-hook.

ATD - Dial Command in Voice/Audio
The dial action command works analogously to the way it works in Data or
Fax modes. When in Voice/Audio Mode (#CLS=8):
1.	The modem attempts to determine when the remote has picked up the
telephone line and once this determination has been made, the VCON message
is sent to the DTE. This determination is initially made based upon
ringback detection and disappearance. (See #VRA and #VRN commands.)
2.	Once connected in Voice/Audio Mode, the modem immediately enters the
command state and switches to Online Voice Command Mode which enables
unsolicited reporting of DTMF and answer tones to the DTE. 
Parameters:	Same as Data and Fax modes.
Result Codes:
VCON	Issued in Voice/Audio Mode (#CLS=8) when the modem determines that
the remote modem or handset has gone off-hook, or when returning to the
Online Voice Command Mode. (See #VRA and #VRN.)
NO ANSWER	Issued in Voice/Audio Mode (#CLS=8) when the modem determines
that the remote has not picked up the line before the S7 timer expires.
Though the modem reports "NO ANSWER", the DTE has the responsibility of
issuing an ATH (or ATZ) to disconnect the telephone line while #CLS=8.
ATH - Hang Up in Voice/Audio
This command works the same as in Data and Fax modes by hanging up
(disconnecting) the telephone line. There are, however, some specific
considerations when in Voice/Audio Mode:
1.	The H command forces #CLS=0, but does not destroy any of the voice
parameter settings such as #VBS, #VSP, etc. Therefore, if the DTE wishes
to issue an H command and then pursue another voice call, it must issue a
subsequent #CLS=8 command, but it need not re-establish the voice
parameter settings again unless a change in the settings is desired.
2.	The #BDR setting is forced back to 0, re-enabling autobaud.
3.	If the #VLS setting is set to select a device which is not, or does
not include the telephone line (such as a local handset or microphone),
the H command deselects this device and reselects the normal default
setting (#VLS =0). Normally, the DTE should not issue the H command while
connected to a local device such as a handset, because merely selecting
this device results in VCON. The normal sequence of terminating a session
with such a device is to use the #VLS command to select the telephone
line, which by definition makes sure it is on-hook. 
Parameters:	Same as Data and Fax modes.
Result Codes:	Same as Data and Fax modes.

ATZ - Reset from Voice Mode
This command works the same as in Data and Fax modes. In addition, the Z
command resets all voice related parameters to default states, forces the
#BDR=0 condition (autobaud enabled), and forces the telephone line to be
selected with the handset on-hook. No voice parameters are stored in NVRAM
so the profile loaded does not affect the voice aspects of this command.
(Note that when #CLS=8, ATZ causes a hang up if the telephone line is
connected.)
Parameters:	Same as Data and Fax modes.
Result Codes:	Same as Data and Fax modes.
#BDR - Select Baud Rate (Turn off Autobaud)
This command forces the modem to select a specific DTE/modem baud rate
without further speed sensing on the interface. When a valid #BDR=n
command is entered, the OK result code is sent at the current assumed
speed. After the OK has been sent, the modem switches to the speed
indicated by the #BDR=n command it has just received.
When in Online Voice Command Mode and the #BDR setting is nonzero (no
autobaud selected), the modem supports a full duplex DTE interface. This
means that the DTE can enter commands at any time, even if the modem is in
the process of sending a shielded code indicating DTMF detection to the
DTE. [Note that when #BDR has been set nonzero, the modem employs the S30
Disconnect Inactivity timer, and this timer starts at the point where #BDR
is set nonzero. If this period expires (nominally 60 seconds) with no
activity on the DTE interface, the modem reverts to #BDR=0, #CLS=0, and
#VLS=0.] 
Parameters:	n = 0 Ð 48 (New baud rate is n*2400 bps)
Default:	0
Result Codes:
OK	For the supported speeds.
ERROR 	Otherwise.
Command options:
#BDR?	Returns the current setting of the #BDR command as an ASCII decimal
value in result code format.
#BDR=?	Returns a message indicating the speeds that are supported.
#BDR=0	Enables autobaud detection on the DTE interface. 
#BDR=n	Where 1<n<48. Sends OK message at current speed, then switches
to the new speed defined by n*2400 bps unless and until another #BDR=n
command is received. Autobaud is disabled, and the character format is
maintained at the format most recently detected.
#CID - Enable Caller ID Detection and Select Reporting Format
This command selects or disables Caller ID recognition and reporting in
any mode.
Parameters:	n = 0, 1, or 2
Default:	0
Result Codes:
OK	n = 0, 1, or 2.
ERROR 	Otherwise.
Command options:
#CID?	Returns the current setting (0,1 or 2) of the #CID command as an
ASCII decimal value in result code format.
#CID=?	Returns the message, Ò0, 1, 2Ó. 
#CID=0	Disables Caller ID.
#CID=1	Enables formatted Caller ID reporting of ICLID SDM (Single Data
Message) and 
MDM (Multiple Data Message) packets. 
#CID=2	Enables unformatted Caller ID reporting of any ICLID packet
received after the first RING cycle including SDM, MDM, or call waiting
packets.

#CLS - Select Data, Fax, or Voice/Audio
This command selects Data, Fax, or Voice/Audio Mode from operation in any
mode.
Parameters:	n = 0, 1, 2, or 8
Default:	0
Result Codes:
OK	If n = 0, 1, 2, or 8.
ERROR 	Otherwise.
Command options:
#CLS?	Returns the current setting (0, 1, 2, or 8) of the #CLS command
as an ASCII decimal value in result code format. 
#CLS=?	Returns the message, Ò0, 1, 2, or 8Ó.
#CLS=0	Data. This is similar to setting +FCLASS=0, and instructs the
modem to act like a data modem on subsequent answer or originate
operations.
	When a disconnect or inactivity time out in the non-autobaud mode is
detected, the modem automatically sets the #CLS setting to 0 and hangs up.
This ensures that the modem is always in a known state despite disorderly
DTE behavior.
#CLS=1	Class 1 fax. This is similar to setting +FCLASS=1, and instructs
the modem to be a Class 1 fax modem. Once this is set, either the +FAA or
the +FAE command can be used to force subsequent answers to be Class 1
adaptive answers.
#CLS=2	Class 2 fax. This is similar to setting +FCLASS=2, and instructs
the modem to be a Class 2 fax modem. Once this is set, the +FAA command
can be used to force subsequent answers to be Class 2 adaptive answers.
#CLS=8	Voice/Audio Mode. This is the main setting the DTE uses to effect
directed or adaptive answer or originate sequences involving voice modes.
All telephone calls initialized by #CLS=8 result (after answer or
successful call progress) in the modem in Online Voice Command Mode. 
#MDL? - Identify Model
This command requests the model number or name of the modem.
Command option:
#MDL? -  RCV144ACi
#MFR? - Identify Manufacturer
This command requests the modem manufacturer.
Command option:
#MFR? -  ROCKWELL
#REV? - Identify Revision Level
This command requests the revision level of the modem. 
Command option:
#REV? - XXXX-XXXX-XXX YYY	(Those places occupied by ÒX"'s represent the
part number, while those places occupied by `Y"'s represent the revision
number. The values are determined at time of production.)

7.3.2.	AT#V Commands Enabled Only in Voice Mode (#CLS=8) 
The commands described in the following subsection are extensions to the
command set which the modem recognizes only when configured for
Voice/Audio Mode with the #CLS=8 command.
#TL- Audio Output Transmit Level
This command provides adjustment of the transmit level of the data pump
audio output, affecting both the playback level of the handset and
speaker. An ERROR result code is returned if the #TL command is issued
when the phone line is selected, however.
Parameters:	n=0000 to 7FFF if the handset or speaker is selected
Default:	7FFF, 	if local handset or speaker is selected
	3F44, 	if the phone line is selected
Result Codes:
OK	If n=0000 to 7FFF when the local handset or speaker is selected
ERROR	If the phone line is selected
#VBQ? - Query Buffer Size
This query-only command returns the size of the modem's voice transmit and
voice receive buffers in ASCII decimal, followed by the OK result code.
Parameters:	None
Command option:
#VBQ?	Returns the size of the modem voice transmit and voice receive
buffers.
#VBS - Bits Per Sample
This command selects the degree of ADPCM voice compression or format of
linear PCM to be used.
Parameters:	n = 2 or 4 (ADPCM Voice compression) bits/sample, or 8 or
16 (PCM) bits/sample
Default:	4 
Result Codes:
OK	If n=2, 4, 8, or 16
ERROR	Otherwise.
Command options:
#VBS?	Returns the current setting of the #VBS command as an ASCII decimal
value in result code format.
#VBS=?	Returns "2" or "4", which are the ADPCM compression bits/sample
rates available, or "8" or "16", which is the PCM bits/sample rate. The 2
and 4 bits/sample rates are correlated with the #VCI query command
response which provides the single compression method available. The "8"
or "16" represents 8-bit or 16-bit unsigned linear PCM format,
respectively.
#VBS=2	Selects 2 bits per sample ADPCM (valid for #VSR = 7200). 
#VBS=4	Selects 4 bits per sample ADPCM (valid for #VSR = 7200).
#VBS=8	Selects 8 bits per sample PCM (valid for #VSR = 7200 or #VSR =
11025).
#VBS=16	Selects 16 bits per sample PCM (valid for #VSR = 7200 or #VSR =
11025).

#VBT - Beep Tone Timer
This command defines the time period, in 10ths of a second up to 4 seconds
(40) which is used by the modem as the DTMF or fixed tone duration for
generating tones via the D command while in Online Voice Command Mode. 
Parameters:	n = 0 Ð 40 (0 Ð 4 seconds)
Default:	10
Result Codes:
OK	If n = 0 Ð 40.
ERROR	Otherwise.
Command options:
#VBT?	Returns the current setting of the #VBT command as an ASCII decimal
value in result code format.
#VBT=?	Returns the message, Ò0-40Ó.
#VBT=0	Disables the tone generation capability. 
#VBT=1 to 40	Sets tone duration time.
#VCI? - Identify Compression Method
This command provides a unique character string which may be used for
identifying the proprietary compression method of Rockwell ADPCM.
Parameters: 	No parameters supported
Default:	No parameters supported
Result Codes:
OK	Returned after the Compression Identifier string.
ERROR	Returned if attempting to assign a parameter value.
Command Options:
#VCI?	Returns the Compression Identifier string which may used to
identify the proprietary voice data encoding of Rockwell ADPCM.

#VLS - Voice Line Select
This action command can be used to select which devices are routed through
the modem. 
Parameters:	n = 0-4 or 6-9 as supported by the model model. [This is the
device position number (not device number) as reflected in response to
#VLS=?]
Default:	0
Result Codes:
OK	If n = 0-4 or 6-9 as supported by the model model.
VCON	If device selected does not connect to the telephone line. (A
speaker is such a device, but a telephone line with speaker ON is not such
a device, and generates OK.)
ERROR	If n does not equal 0-4, 6-9 (if the modem does not support
speakerphone), or if telephone line or local handset is already off-hook.
Command options:
#VLS?	This query returns the current setting of the #VLS command as an
ASCII decimal value in result code format.
#VLS=?	This query requests a report of the device types available for
selection. The response is a number from 0 to 4 corresponding the device
position number (see Table 7-5).
#VLS=0	The default option on the modem. This command instructs the modem
that when entering any of the three voice operating submodes (Online
Command, Transmit, or Receive), that the telephone line interface should
be routed through the modem. The OK response is sent to the DTE, and any
previous connection is lost (i.e., the modem ends up on-hook as a result
of issuing this command to connect to the telephone line).
#VLS=1	This command instructs the modem to route only the handset through
the modem. This setting can be chosen before recording a greeting message.
#VLS=2	This command instructs the modem to route only the speaker through
the modem. This setting can be chosen before playing back any message. The
modem immediately switches to Online Voice Command Mode, and the VCON
response is generated for completeness. However, since this is an output
only device, nothing of consequence can happen until the DTE sends the
#VTX command.
#VLS=3	This command instructs the modem that only the auxiliary input
device (microphone) should be routed through the modem. This setting can
be chosen before recording a greeting message.
#VLS=4	This command is the same as #VLS =0, except that the modem enables
the internal speaker as well as the telephone line/handset circuit. 
#VLS=6	This command selects speakerphone mode while in #CLS=8 mode.
Speakerphone operation is entered during Voice On-line (VCON) mode after
completing dialing (ATD) or answering (ATA). 
#VLS=7 	(Valid after Voice On-line mode.) This command mutes the local
handset by switching the handset or speakerphone out of the telephone line
path if in #VLS=0 or #VLS=6 mode. To unmute, the host software should
issue AT#VLS=0 or AT#VLS=6 to return to phone line or speakerphone mode,
respectively. 
	On hardware designs which incorporate the audio codec, #VLS=7 can be
used to route the codec's output through the phone line to provide
music-on-hold feature.
#VLS=8	(Valid after Voice On-line mode.) This command engages the Caller
ID relay to allow recording of conversation when using a handset by
routing the signal to the audio codec (if populated). To deactivate the
Caller ID relay, the host should issue an AT#VLS=0 or AT#VLS=6 to return
to phone line or speakerphone mode, respectively.
#VLS=9	This command routes the handset to the sound codec to allow
recording/playback of audio (e.g. greeting messages) through the local
handset. 

Table 7-5.	Device Types Supported by #VLS
ASCII Digit	Device Type and Considerations
0	Telephone Line with Telephone handset. This is the default device
selected. In this configuration, the user can pick up a handset which is
connected to the same telephone line as the modem, and * record both sides
of a conversation with a remote station. The modem currently supports one
telephone line/handset, which is in the first position of the #VLS =?
response. (Note that the modem can interface to multiple telephone lines
by having Ò0Ó's in multiple positions in the #VLS ? response.) If a
telephone line is selected, the modem must be on-hook or it hangs up. The
OK message is generated.
1	Transmit/Receive Device (other than telephone line). This is a handset,
headset, or speaker-phone powered directly by the modem. When such a
device is selected, the modem immediately enters Online Voice Command
Mode, DTMF monitoring is enabled if applicable, and the VCON response is
sent. The modem supports one such device as the second device listed in
the #VLS =? response.
2	Transmit Only Device. Normally, this is the onboard speaker. When this
device is selected, the modem immediately enters Online Voice Command
Mode, and the VCON response is sent. The modem supports selection of the
internal speaker as the third device listed in #VLS =? response.
3	Receive Only Device. Normally, this is a microphone. When such a device
is selected, the modem immediately enters Online Voice Command Mode, DTMF
monitoring is enabled if applicable, and the VCON response is sent. The
modem supports one microphone as the fourth element returned in the #VLS
=? response.
4	Telephone line with Speaker ON and handset. This device type can be
used to allow the DTE to select the telephone line/handset (if picked up)
with the modem speaker also turned ON. This can be used by the DTE to
allow the user to monitor an incoming message as it is recorded.
6	Speakerphone. This is a handset, headset, or speaker-phone powered
directly by the modem. When such a device is selected, the modem
immediately enters Online Voice Command Mode, DTMF monitoring is enabled
if applicable, and the VCON response is sent. The modem supports one such
device as the second device listed in the #VLS =? response.
7	Muting the Local Handset During Phone Conversation - Music on Hold.
This command mutes the local handset by switching the handset or
speakerphone out of the telephone line path if in #VLS=0 or #VLS=6 mode.
To unmute, the host software should issue AT#VLS=0 or AT#VLS=6 to return
to phone line or speakerphone mode, respectively. 
On hardware designs which incorporate the audio codec, #VLS=7 can be used
to route the codec's output through the phone line to provide
music-on-hold feature.
8	Recording a Handset Conversation on Phone Line. This command engages
the Caller ID relay to allow recording of conversation when using a
handset by routing the signal to the audio codec (if populated). To
deactivate the Caller ID relay, the host should issue AT#VLS=0 or AT#VLS=6
to return to phone line or speakerphone mode, respectively. 
9	Recording/Playback from Handset through Sound Chip.This command (valid
after Voice On-line mode) routes the handset to the sound codec to allow
recording/playback of audio (e.g. greeting messages) through the local
handset. 

#VRA - Ringback Goes Away Timer (Originate)
This command can be used, when originating a voice/audio call (#CLS=8) to
set the ÒRingback Goes AwayÓ timer value, i.e., an amount of time (in
units of 100 ms) measured from when the ringback cadence stops once
detected. If ringback is not detected within this period, the modem
assumes that the remote has picked up the line and switches to Online
Voice Command Mode. Every time a ringback cycle is detected, this timer is
reset. 
Parameters:	n = 0 Ð 255 (0 Ð 2.55 seconds)
Default:	70
Result Code:	OK
Result Code:
OK	If n = 0 Ð 255.
ERROR	Otherwise.
Command options:
#VRA?	Returns the current setting of the #VRA command as an ASCII decimal
value in result code format.
#VRA=?	Returns the message, Ò0-255Ó.
#VRA=0	Turns off the Òringback goes away timer.Ó After one ringback, the
dialing modem sends VCON and enters Online Voice Command Mode immediately.
#VRA=n	Where n defines the period without ringback (after at least one
ringback has been detected) in 100 ms units.
#VRN - Ringback Never Came Timer (Originate)
This command can be used when originating a voice/audio call (#CLS=8) to
set the ÒRingback Never CameÓ timer value, i.e., an amount of time (in
units of 100 ms) measured from completion of dialing. If ringback is not
detected within this period, the modem assumes the remote has picked up
the line and switches to Online Voice Command Mode. 
Parameters:	n = 0 Ð 255 (0 Ð 2.55 seconds)
Default:	100
Result Code:
OK	If n = 0 Ð 255.
ERROR	Otherwise.
Command options:
#VRN?	Returns the current setting of the #VRN command as an ASCII decimal
value in result code format.
#VRN=?	Returns the message, Ò0-255Ó.
#VRN=0	Turns off the Òringback never came timer.Ó After dialing, the
modem sends VCON and immediately enters Online Voice Command Mode.
#VRN=n	Where n defines the period without ringback after dialing in 100
ms units.
#VRX - Voice Receive
This action command is only valid if the modem is in the Online Voice
Command Mode (indicated previously with the VCON message), and is the
switch to the Voice Receive Mode. This command is used when a voice file
is to be received from the line, microphone, or handset. The #VLS command
should have been previously issued to select the input source.
Parameters:	None
Result Codes:
CONNECT	When voice/audio transfer from modem to DTE can begin.
ERROR	If #VLS=0 and not connected to any input device.

#VSD - Enable Silence Deletion (Voice Receive) [ADPCM]
This command is used to enable or disable Voice Receive Mode silence
deletion (ADPCM).
Parameters:	n = 0 or 1
Default:	0
Result Code:
OK	If n = 0 or 1.
ERROR	Otherwise.
Command options:
#VSD?	Returns the current setting of the #VSD command as an ASCII decimal
value in result code format.
#VSD=?	Returns the message, Ò0,1Ó.
#VSD=0	Turns off the silence deletion. 
#VSD=1	Turns on the silence deletion if the silence sensitivity setting
#VSS is nonzero. The aggressiveness of the silence deletion is controlled
by #VSS.
#VSK - Buffer Skid Setting
This command queries and sets the number of bytes of spare space, after
the XOFF threshold is reached, in the modem's buffer during Voice Transmit
Mode. This equates to the ÒskidÓ spare buffer space, or the amount of data
the DTE can continue to send after being told to stop sending data by the
modem, before the modem voice transmit buffer overflows.
Parameter:	n = 255 (Number of bytes of Òskid spare buffer space)
Default:	255
Result Code:
OK	If n = 255.
ERROR	Otherwise.
Command options:
#VSK?	Returns the current setting of the #VSK command as an ASCII decimal
value in result code format.
#VSK=?	Returns the message, Ò255Ó.

#VSP - Silence Detection Period (Voice Receive) [ADPCM]
This command sets the Voice Receive Mode silence detection period
(inactivity timer) value. The parameter, in units of 100 ms, can be used
when receiving voice data. This is an amount of time, which if elapsed
without receiving any ADPCM data, causes the modem to send the <DLE>s or
<DLE>q codes after insuring that the buffer is empty. There are two cases:
1.	With the modem's silence deletion feature enabled, the #VSP setting
is in effect an inactivity timer. The modem must reset this timer on every
byte of voice data received. 
2.	With the modem's silence deletion feature disabled, the modem
determines what constitutes silence. This involves monitoring and
debouncing the modem value for average energy. If this debounced value is
less than an arbitrary threshold constituting the modem's definition of
silence for a period greater than that defined by the #VSP setting, the
modem sends the <DLE>q or <DLE>s shielded code to the DTE.
Parameters:	n = 0 Ð 255 (0 Ð 25.5 seconds)
Default:	55
Result Code:
OK	If n = 0 Ð 255.
ERROR	Otherwise.
Command options:
#VSP?	Returns the current setting of the #VSP command as an ASCII decimal
value in result code format.
#VSP=?	Returns the message, Ò0-255Ó.
#VSP=0	Turns off the silence period detection timer.
#VSP=n	Where n defines the period without received voice data in 100 ms
units.
#VSR - Sampling Rate Selection 
This parameter, along with the bits per sample (#VBS) command, determines
the necessary DTE interface speed to transmit and receive in Voice/Audio
Mode.
Parameters:	n=7200 (7200 Hz sampling rate for ADPCM or PCM), or 
n=11025 (11.025 kHz sampling rate for PCM only)
Default:	7200
Result Codes:	
OK	If n=7200, or if n=11025 and #VBS=8, or #VBS = 16
ERROR 	Otherwise
Command options:
#VSR?	Returns the current setting of the #VSR command as an ASCII decimal
value in result code format.
#VSR=?	Returns the message "7200, 11025"
#VSR=7200	Selects 7200 Hz sampling rate
#VSR=11025	Selects 11.025 kHz sampling rate

#VSS - Silence Detection Tuner (Voice Receive) [ADPCM]
This command enables or disables the Voice Receive mode silence detection,
and controls the sensitivity employed by the modem in ADPCM compressing
periods of silence. 
Parameters:	n = 0 Ð 3
Default:	0
Result Codes:
OK	If n = 0 Ð 3.
ERROR	Otherwise.
Command options:
#VSS?	Returns the current setting of the #VSS command as an ASCII decimal
value in result code format.
#VSS=?	Returns the message Ò0,1,2,3". 
#VSS =0	Disables silence detection by the modem when in Voice Receive
Mode. 
#VSS =1	Least sensitive setting. When this command is received by the
modem, the system is configured to a state which is least likely to detect
and compress periods of silence, but still able to do so if the line is
really quiet. 
#VSS =2	Midrange setting (default). When this command is received by the
modem, the system is configured to a state which is likely to be the best
overall compromise on normal telephone lines.
#VSS =3	Most sensitive setting. When this command is received by the
modem, the system is configured to a state which is most likely to detect
and compress periods of silence.

#VTD - DTMF Tone Reporting
This command queries and controls which types of tones can be detected and
reported to the DTE via shielded codes in Voice Transmit, Voice Receive,
and Online Voice Command Modes.
Parameters:	i, j, k (three ASCII hexadecimal bit maps)
Default:	3F, 3F, 3F
Result Codes:
OK	If bits supported with #VTD=? are selected.
ERROR	Otherwise.
Command options:
#VTD?	Returns the current setting of the #VTD command as an ASCII decimal
value in result code format.
#VTD=?	Returns the tone reporting capabilities of the modem.
#VTD=i,j,k	Where i,j,k corresponds (in ASCII hexadecimal) to the desired
capabilities, as shown in Table 7-6, for Voice Transmit, Voice Receive,
and Online Voice Command Modes, respectively.

Table 7-6.	#VTD Tone Detection/Reporting Bit Settings
Bit	Description
0	0 = Disable DTMF tone capability;
1 = Enable DTMF tone capability 1.
1	0 = Disable V.25 1300 Hz Calling tone capability;
1 = Enable V.25 1300 Hz Calling tone capability 1.
2	0 = Disable T.30 1100 Hz Facsimile Calling tone capability;
1 = Enable T.30 1100 Hz Facsimile Calling tone capability 1.
3	0 = Disable V.25/T.30 2100 Hz Answer tone capability;
1 = Enable V.25/T.30 2100 Hz Answer tone capability 1.
4	0 = Disable Bell 2225 Hz Answer tone capability;
1 = Enable Bell 2225 Hz Answer tone capability 1.
5	0 = Disable call progress tone and cadence (e.g., busy and dial tone)
capability;
1 = Enable call progress tone and cadence (e.g., busy and dial tone)
capability 1.
6-7	Reserved.
Notes:	1.	The modem detects this tone/cadence, and reports it via a
shielded code to the DTE. 
	2.	Tone detection is only performed when the sampling rate is 7.2
kHz (see the #VSR command).	
	

#VTM - Enable Timing Mark Placement
This command controls the placement of <DLE><T> timing marks by the DCE in
the data stream during ADPCM recording.
Parameters: 	n=0 (disabled) or 10 (1 second interval)
Default:	n=0 (disabled)
Result Codes:
OK	If n=0 or 10
ERROR	Otherwise
Command Options:
#VTM?	Returns the current setting of the #VTM command as an ASCII decimal
value in result code format.
#VTM=?	Returns "0, 10"
#VTS - Generate Tone Signals (Online Voice Command)
This action command can be issued to play one of more DTMF or other tones
(such as a Òbeep") if and only if the modem is in the Online Voice Command
Mode and the sampling rate (see the #VSR command) is set to 7.2 kHz. The
modem parses and plays the tones defined in the parameter in the order
listed, and no key abort is accepted. The parameter can have three types
of elements separated by commas, and following "#VTS=":
Dual or Single Tones with Variable Duration: These are represented by the
substring [x,y,z] (enclosed in square brackets, "[ ]", as shown) in the
parameter field. Each such substring consists of three sub-elements
corresponding to the two frequencies (i.e., x and y), and the duration
(i.e., z).

[x,y,z] 	x represents the first frequency (0 or 200-3000 Hz)
		y represents second frequency (0 or 200-3000 Hz)
		z represents the duration (which is ASCII decimal in units of 100
ms)

DTMF Digits with Variable Duration. This is represented by a substring
{x,z} (enclosed in curly braces, "{}", as shown) in the parameter field.
Each such substring consists of two sub-elements corresponding to a DTMF
digit (i.e., x) and the duration (i.e., z).

{x,z} 	x represents the DTMF digit (0-9,A-D,*,#)
		z represents the duration (which is ASCII decimal in units of 100
ms)

DTMF Digits, with duration defined by #VBT. This is represented by a value
x (non-bracketed) corresponding to a DTMF digit (i.e., x) in the parameter
field.

x		x represents the DTMF digit (0-9,A-D,*,#), with the duration defined
by #VBT
Command options:
#VTS=[x,y,z], {x,z}, and/or x, as described above.
Parameters:	The tone generation consists of elements in a list with each
element separated by commas.
Result Codes:
OK	Command to play tones on currently selected device is accepted.
ERROR	Command was not issued during Online Voice Command Mode or string
is grammatically incorrect.

#VTX - Voice Transmit
This action command can be issued if and only if the modem is in the
Online Voice Command Mode (indicated previously with the VCON message),
and is the switch to Voice Transmit Mode. #VTX is used when a voice file
is to be transmitted to the line, speaker, or handset. The #VLS command
should have been previously issued to select the output source.
Parameters:	None
Result Codes:	
CONNECT	When voice transmission by DTE can begin.
ERROR	If #VLS =0 and output device not connected.
#VGT - Set Playback Volume in the Command State
The #VGT command allows the DTE to set the playback volume of the
headphone and speaker outputs via the on-board digital potentiometer while
in the command state. The application can use #VGT=? command to determine
the range of valid values. The lowest value in the range means the lowest
transmit level while the highest in the range means the highest transmit
level. 
Parameters:	n=128 to 228
Default:	153
Result Codes:
OK	if n=128 to 228
ERROR	Otherwise
Command Options:
#VGT=?	Returns "128-228" if the external volume control is present,
otherwise "128".
VGT?	153 (default).
<DLE><u> and <DLE><d> - Set Playback Volume in the Data State
The <DLE>u and <DLE>d action commands allow the DTE to adjust the playback
volume of the headphone and speaker outputs via the on-board digital
potentiometer while in the data state. The application may embed the
<DLE>u and <DLE>d codes into the playback data to adjust the volume during
playback. Each <DLE>u or <DLE>d will increment or decrement the transmit
level by 1 unit, respectively. Adjustment by a value greater than 1 may be
achieved by transmitting a string of the appropriate <DLE> codes. A string
consisting of "<DLE>u<DLE>u<DLE>u<DLE>u<DLE>u", for example, would
increase the playback volume by a value of 5 units. The <DLE>u and <DLE>d
codes can be used to adjust the volume within the range of 128-228.
Command Options:
<DLE><u> 	Increment volume (transmit level) by 1 unit in data state.
<DLE><d> 	Decrement volume (transmit level) by 1 unit in data state.
7.3.3.	Speakerphone Commands
Modem speakerphone models support full-duplex speakerphone operation.
Hardware designs typically include an audio codec which support functions
such as music on hold, telephone/speakerphone conversation recording, and
handset recording through the audio codec. 
This section describes the AT commands used by host software to enable
speakerphone operation and route the audio codec to and from the telephone
line/handset. Also described is a procedure to operate speakerphone,
headset, and handset modes with VoiceView.
The #VLS=6 setting selects speakerphone mode while in #CLS=8 or +FCLASS=80
mode. Speakerphone operation is entered during Voice On-line (VCON) mode
after completing dialing (ATD) or answering (ATA).  

Originating a Call in Speakerphone Mode
To initiate a call with the speakerphone, issue:
AT#CLS=8
AT#VRN=0
AT#VLS=6	(Selects the speakerphone)
It is recommended to set the VRN command to 0 which disables ringback
detection before reporting the VCON message.
ATDT<number>
The modem then responds with:
VCON	(based on the AT#VRA and #VRN setting)
Additional DTMF (for example in a voice mail application) can be entered
by issuing:
AT#VTS=<digit>
When DTMF digits are sent, it is recommended that the default value of the
tone length be changed to 100 ms using the command #VBT:
AT#VBT=1
The call can be transferred (PBX function) by entering the flash dial
modifier (AT#VTS=!).
Terminate the call with:
ATH
Answering a Call in Speakerphone Mode
To answer a call in speakerphone mode, issue:
AT#CLS=8
AT#VLS=6	(Selects the speakerphone)
When the modem detects the ring, the modems reports:
RING
The DTE can answer with:
ATA
The modem sets the speakerphone and sends:
VCON
Terminate the call with:
ATH
Muting the Local Handset During Phone Conversation - Music on Hold
To mute the local handset during a phone conversation, issue the the
following command:
AT#VLS=7 (valid after Voice On-line mode)
This command mutes the local handset by switching the handset or
speakerphone out of the telephone line path if in #VLS=0 or #VLS=6 mode. 
To unmute, the host should issue an AT#VLS=0 or AT#VLS=6 to return to
phone line or speakerphone mode, respectively.
On hardware designs which incorporate the audio codec, #VLS=7 can be used
to route the codec's output through the phone line to provide
music-on-hold feature.

Recording a Handset Conversation on the Phone Line 
To recording a handset conversation on the phone line, issue:
AT#VLS=8 (valid after Voice On-line mode)
This command engages the Caller ID relay to allow recording of
conversation when using a handset by routing the signal to the audio codec
(if populated). 
To deactivate the Caller ID relay, the host should issue an AT#VLS=0 or
AT#VLS=6 to return to phone line or speakerphone mode, respectively.
Recording/Playback from Handset through Sound Chip
To recording/playback from the handset through a sound chip (valid after
voice on-line mode), issue:
AT#VLS=9
This command routes the handset to the sound codec to allow
recording/playback of audio (e.g. greeting messages) through the local
handset.  
#SPK Parameter
The setting of the speakerphone can be changed with the AT#SPK command:
AT#SPK=<mute>,<spkr>,<mic>
The #SPK command can be used to control the microphone state (mute or on),
adjust the speaker volume, and microphone gain. The #SPK parameters are
are valid only after the modem has entered the Voice Online (VCON) mode
while in the #VLS=6 setting (after a VCON during originate or answer). The
modem will respond "ERROR"  otherwise. 
Parameters:
<mute> 	Mute Parameter Number
	0 	microphone mute
	1	microphone on (default)
	2	Room Monitor mode (mic on max AGC, speaker off)
<spkr> 	Speaker Output Attentuation (
	Range: 0 to15 (speaker attenuation in 2 dB steps)
	0	0 dB attneuation
	.
	5	10 dB attenuation (default)
	.
	15	30 dB attentuation
	16	Speaker mute
<mic>	Microphone Gain Parameter 
	Range: 0 to 3\
	0	0 dB
	1	6 dB gain (default)
	2	9.5 dB gain
	3	12 dB gain
It is not necessary to enter all <mute>, <skpr>, <mic> options while
issuing AT#SPK. For example:
1.	To mute the microphone without changing speaker volume, issue
AT#SPK=0,,,.  
2.	To change speaker volume to 6 without affecting microphone setting,
issue AT#SPK=,6,,.
3.	To change speaker volume to 2 and microphone gain to 9.5 dB, issue
AT#SPK=,6,2.
Room Monitor
The modem can be configured to a listen only mode where the microphone
automatic gain control is set to maximum (50 dB).  The feature is called
Room Monitor and the allow an application where a remote caller calls the
computer to monitor what is happening the room.  The following setting
will enable Room Monitor mode.
AT#SPK=2,,,
Switching Between #VLS Settings:
Switching between different #VLS settings during Voice On-line mod is
permitted although only certain combinations may be useful. The #VLS
settings are grouped into local and remote.  Switching between #VLS
settings should be within either local or remote groups.
Local #VLS settings are defined as the modem being on-hook and isolated
from the telco line
during Voice On-line (VCON) mode.  The local settings are #VLS=1, #VLS=2,
#VLS=3, and #VLS=9.  Remote #VLS settings are defined as the modem being
off-hook and connected to the telco line during Voice On-line mode.  The
remote settings are #VLS=0, #VLS=4, #VLS=5, #VLS=6. #VLS=7, and #VLS=8.
Example 1:
An example of how host software will switch #VLS settings in local mode is
an application which records a greeting message through the handset and
review the message through the speaker.  To accomplish this functionality,
the modem is set to #VLS=1 (local handset recording/playback) during the
recording process and is switched to #VLS=2 (playback through speaker) to
monitor the playback.
Example 2:  
An example of how host software will switch #VLS settings in remote mode
is a telephone answering application which has a call screening mode.  The
application plays a greeting message with the speaker off (#VLS=0) and
switches the speaker on when recording the incoming message (#VLS=4).  If
the user decides to answer the call he picks up the handset (a <DLE>t is
reported to the software), the recording process will stop and the modem
releases the line (ATH).  
Reporting of Local Handset Status
The modem reports the off-hook to on-hook and on-hook to off-hook
transition of the local handset by the <DLE>h and <DLE>t characters,
respectively.  The handset status is reported after the issuing of the
AT#CLS=8 command and updated whenever transitions of the handset status
are detected.  This handset status reporting does not depend if the modem
is in Voice On-line (VCON) mode.
This is useful for auto dialer applications which need to know the handset
transitions during and after the dialing process.

7.3.4.	Using VoiceView with Speakerphone, Headset, and Handset modes
Handset (#VLS=0), speakerphone (#VLS=6), or headset mode (#VLS=5) can be
selected during VoiceView mode (+FCLASS=80), when dialing is done on the
handset. The ATA command is not accepted while in VoiceView mode in
accordance with the VoiceView Protocol specification. While in VoiceView
mode, the modem can alternate between handset mode (#VLS=0) or
speakerphone mode (#VLS=6) settings for voice conversation.
To terminate a call using a handset in VoiceView mode, hang up the
handset. 
To terminate a speakerphone call in VoiceView mode, issue the ATH command.
 
Example 3
Originate a VoiceView call with handset dialing and switch to speakerphone
and handset modes:
DTE commands	DCE Response	Function
		Pick up handset, dial number, and establish voice conversation.
AT+FCLASS=80		Enable VoiceView mode.
	OK	
AT#VLS=6		Switch to speakerphone mode.
	OK	
		(Establish VoiceView Data Mode using normal VoiceView procedures.)
		Continue with speakerphone conversation.
AT#VLS=0		Switch to handset for privacy.
	OK	
		Hang up handset to terminate call.

Example 4
Originate a VoiceView call with handset dialing and switch to speakerphone
mode:
DTE commands	DCE Response	Function
		Pick up handset, dial number, and establish voice conversation.
AT+FCLASS=80		Enable VoiceView mode.
	OK	
AT#VLS=6		Switch to speakerphone mode.
	OK	
		(Establish VoiceView Data Mode using normal VoiceView procedures.)
		Continue with speakerphone conversation.
ATH		Terminate speakerphone call.

Using Modem as Dialer Prior to VoiceView Mode
To use the modem to dial a call,  the modem must be in Voice On-line mode
(via #CLS=8) to dial before enabling VoiceView mode.  VoiceView mode can
enabled by the AT+FCLASS=80 parameter after Voice On-line (VCON) mode in
handset, speakerphone or handset emulation modes. The modem can be
switched between handset (#VLS=0) and speakerphone (#VLS=6) modes during
+FCLASS=80, as described in the previous section.
Example 5
Originate VoiceView call in Speakerphone mode:
DTE commands	DCE Response	Function
AT#CLS=8#VRN=0#VLS=6		Set modem to Speakerphone mode.
	OK	
ATDTnnnnnnn		Dial remote caller.
	VCON	Call established.
AT+FCLASS=80		Enable VoiceView mode.
	OK 	
		(Establish VoiceView Data Mode using normal VoiceView procedures.)
		Continue with speakerphone conversation.
ATH		Terminate speakerphone call.

7.4.	S-REGISTERS 
The following S-Register is global, meaning that it can be set in any
appropriate mode (i.e., any #CLS setting).
S30 - Disconnect Inactivity Timer
Range:	n = 0 Ð 255
Default:	0 (OFF, which means DTE should usually set it to some value for
Voice)
Command options:
S30=0	Disconnect Inactivity timer off. No matter how long it might
continue, the modem never spontaneously hangs up the telephone line or
switches to autobaud mode as a result of inactivity.
S30=1 to 255	This is the period of time (in seconds), which if expired
causes the modem to hang up the telephone line if it is off-hook and no
data has passed during the period. The timer is also active whenever the
#BDR setting is non-zero. In order to avoid a state where speed sense is
disabled (even though the PC can crash, come back up, and try to issue
commands at what should be a supported speed), the inactivity time-out
occurs if there is no data passed on the DTE interface within the S30
period, even if the modem is on-hook. DTE software must not select a
nonzero setting for #BDR until it is ready to establish a telephone call
or virtual connection to a speaker or microphone. When there is an
inactivity time out with #CLS=8, the modem always forces #CLS=0 and
#BDR=0.
7.5.	RESULT CODES FOR VOICE OPERATION
VCON	VCON is sent when the modem is configured for voice/audio (#CLS=8),
or when after answering or originating a call, the modem enters the Online
Voice Command Mode for the first time. Typically, this is immediately
after an off-hook in answer mode, and after ringback ceases in originate
mode. VCON is also sent when the DTE requests a switch from Voice Transmit
Mode to Online Voice Command Mode by issuing a <DLE><ETX> to the modem, or
when the DTE requests a switch from Voice Receive Mode to Online Voice
Command Mode via the key abort.
CONNECT	CONNECT is sent when switching from the Online Voice Command Mode
to either Voice Receive Mode via the #VRX command, or to Voice Transmit
Mode via the #VTX command. This message is sent to the DTE to inform it
that it may begin receiving or sending ADPCM or PCM data.
7.6.	EXAMPLES OF VOICE OPERATION
See Tables 7-7 through 7-13.

Table 7-7.	Record a Greeting Message
DTE to Modem	Modem to DTE	Description and Interpretation
#CLS=8		Configure the modem for Voice Mode. 
	OK	The modem confirms command implemented, and is now set up for
voice.
#VBS=4		The DTE asks for 4-bit compression (ADPCM). The DTE needs to
work at 38,400 bps since after start and stop bits are added, the speed
increases to 36,000 bps.
	OK	The modem is configured for 4-bit compression.
S30=60		DTE wants to insure that the modem can recover even if DTE
dies with the baud rate set to a speed which cannot be speed sensed.
	OK	Modem now has Disconnect Inactivity timer set to 1 minute. If no
activity takes place after a connection, or no DTE activity takes place
after #BDR is changed, the modem reverts to #CLS=0, #BDR=0.
#BDR=16		The DTE knows that compression requires a 38,400 bps speed,
so it forces this as the new speed. (For this example, lets say that the
DTE was sending all commands, including this one, at 2400 bps.)
	OK	This OK message is sent at 2400 bps, but the modem then switches
to 38,400 bps. All subsequent commands are assumed to be sent at 38,400
bps. If the DTE does not switch to 38,400 bps after the OK<CR><LF>, it
will not recognize the data stream coming from the modem. The S30 timer is
now active.
#VSP=20		The DTE changes its own speed to 38,400 bps and sends this
command to set up the silence detection period for 2 seconds.
	OK	The modem agrees. When receiving voice data, 2 seconds of silence
terminates the Receive Mode. For handset operation, this amounts to a hang
up.
#VSD=1		This enables silence deletion. 
	OK	The modem confirms command reception.
#VSS =1		The DTE has decided to use level Ò1Ó silence detection
sensitivity, meaning it is making it somewhat more difficult to delete and
compress silence for the modem, but expects that when the user has hung up
the handset, the silence is indeed detected. The DTE has tried to improve
the quality of the message because it knows this is a handset operation.
Also, since silence deletion has been enabled, the #VSP setting for
silence detection now becomes basically an inactivity timer. If silence
deletion is turned off here instead of enabled, the #VSP timer is based
upon average energy readings from the modem.
	OK	The modem confirms command reception. 
#VLS=?		Find out what type of devices are supported by the product.
	0,1,2,3,4

OK	The modem tells the DTE that is has a telephone line with handset
(#VLS=0), an input/output device such as a handset or speaker-phone
(#VLS=1), and an output only device such as a speaker.
#VLS=1		Select the handset as the input device to be used by the modem.

	VCON	The modem agrees, switches out the telephone line, switches in
the handset, and the modem enters Online Voice Command Mode. Since this is
a handset, and since the baud rate has been preselected with #BDR, this
also means that DTMF detection and reporting is now enabled. The user can
pick up the telephone and send tones at this point, which are delivered as
shielded codes to the DTE, although the voice data is not yet being
passed.

Table 7-7.	Record a Greeting Message [ContÕd]
DTE to Modem	Modem to DTE	Description and Interpretation
#VRX		This tells the modem that the DTE is ready to receive a voice
message at the current compression/sampling settings.
	CONNECT	The modem tells the DTE that it can now expect data. The
modem enters Voice Receive Mode. DTMF monitoring is still enabled as well
as ADPCM data flow. 
	<Data>	User says: ÒHello, this is me, press * to skip this message.
I'm happy that you have called, so press 5 to send your fax, or you can
leave your message at the beep.Ó User then hangs up, the message is
buffered to the DTE, and the DTE waits for the message to end. The DTE
should have some kind of maximum timer running to ensure that the user
won't speak longer than some predetermined limit. Alternatively, the DTE
can require the user to enter a DTMF tone to terminate transmission of the
message to the DTE.
	<DLE>q	The modem has noticed (#VSP time out) that the user has finished.
The modem reports this while staying in Voice Receive Mode. DTMF detection
and reporting is still active. The DTE now has the entire greeting message
on disk.
	<DLE>*	The user has inadvertently pressed the Ò*Ó button, but the DTE is
not interested in this presently.
!		The DTE issues a key abort to switch to Online Voice Command
Mode.
	<DLE><ETX>
VCON	The modem exits Voice Receive Mode and switches to Online Voice
Command Mode.
#VLS=0		The DTE did not really have to do this, but wants to make
sure that it gets no more DTMF codes from the handset. Selection of the
telephone line here forces the modem out of Online Voice Command Mode,
which is equivalent to hanging up.
	OK	


Table 7-8.	Playback a Greeting Message
DTE to Modem	Modem to DTE	Description and Interpretation
#CLS=8		Configure the modem for Voice Mode. 
	OK	The modem confirms command reception, and is now set up for
voice.
#VBS=4		The DTE asks for 4-bit compression. The data from the DTE
needs to travel at 38,400 bps since after start and stop bits are added,
the speed increases to 36,000 bps.
	OK	The modem is configured for 4-bit compression (ADPCM).
#BDR=16		The DTE knows that compression requires a 38,400 bps speed,
so it forces this as the new speed. (For this example, lets say that the
DTE was sending all commands, including this one, at 4800 bps.)
	OK	This OK message is sent at 4800 bps, but the modem switches to 38,400
bps. All subsequent commands are assumed to be sent at 38,400 bps. The DTE
should switch after the <CR><LF> following the OK. The S30 timer is now
active.
#VSD=1		This enables silence insertion.
	OK	The modem confirms command reception.(#VSS is unnecessary for
playback.)
#VLS=2		Select the speaker as the output device to be used by the
modem.
	VCON	The modem confirms command reception, and enters Online Voice
Command Mode. Since this is an output only device, nothing more can happen
yet.
#VTX		This tells the modem that the DTE is ready to send voice per
the current compression/sampling settings.
	CONNECT	The modem tells the DTE that it can now send data. The
modem enters Voice Transmit Mode and ADPCM data flow begins.
<Data>		The DTE sends data. The modem waits 1 second before starting
to transmit to the speaker to ensure uninterrupted data flow. If the voice
transmit buffer runs empty, the transmitter is disabled.
<DLE><ETX>		The DTE has finished its transmission and now instructs
the modem to enter Online Voice Command Mode after emptying the voice
transmit buffer.
	VCON	The modem tells the DTE it is done. If the DTE sends the <DLE><ETX>
before the modem has finished transmitting all the data in its buffer, the
DTE must wait for this response. (VCON indicates that the DTE can send
more data at any time with #VTX.)


Table 7-9.	Answer Call/Play Greeting/Record Message
DTE to Modem	Modem to DTE	Description and Interpretation
#CLS=8		Configure the modem for Voice Mode. Note that the #BDR setting is
assumed to be zero here, meaning that no time-out occurs forcing #CLS=0.
	OK	The modem agrees, and is now set up for voice.
#VBS=4		The DTE asks for 4-bit compression for greeting message playback
(ADPCM). The DTE needs to work at 38,400 bps since after start and stop
bits are added, the speed increases to 36,000 bps.
	OK	The modem is configured for 4-bit compression.
#VSD=1		This enables silence deletion.
	OK	The modem confirms command reception. 
#VSS =2		Set silence detection sensitivity.
	OK	The modem confirms command reception. 
#VLS=0		Select the telephone line as the source, ensuring that the
modem is now on-hook. DTMF detection is now off regardless of the previous
setting of #VLS.
	OK	The modem confirms command reception, and it switches in the
telephone line.
	RING	Some time later, we receive the first call. (Note that the
modem also processes Caller ID information at this time.)
#CLS=8		Configure the modem for Voice Mode again. Although the modem
has already been so configured, it is a good idea to select #CLS=8
directly following a RING because in normal use, any S30 time-out or hang
up during Voice Mode forces #CLS=0.
	OK	The modem agrees, and is now definitely set up for voice.
#BDR=16		The DTE knows that compression requires a 38,400 bps speed,
so it forces this as the new speed. (For this example, lets say that the
DTE was sending all commands, including this one, at 9600 bps.)
	OK	This OK message is sent at 9600 bps, but the modem then switches
to 38,400 bps. All subsequent commands are assumed to be sent at 38,400
bps until either another #BDR command is received or until the S30 timer
expires. The S30 timer is now activated, and the default is 60 seconds.
A		The DTE tells the modem to answer.
	VCON	The modem is now in Online Voice Command Mode. DTMF and calling
tone detection is enabled.


Table 7-9.	Answer Call/Play Greeting/Record Message [ContÕd]
DTE to Modem	Modem to DTE	Description and Interpretation
#VTX		The DTE does not wait for any tones, and tells the modem that
it is ready to send a voice greeting at the current compression and
sampling settings (4-bit/7200). 
	CONNECT	The modem tells the DTE that it can now send data. The
modem enters Voice Transmit Mode and DTMF monitoring is still enabled as
well as the ADPCM data flow.
<Data>		The DTE sends greeting message data. The modem waits up to 1
second or until XOFF threshold is reached before starting to transmit to
ensure uninterrupted data flow. If the voice transmit buffer runs empty,
the transmission is disabled.
<DLE><ETX>		The DTE has finished with its transmission, and now instructs
the modem to enter Online Voice Command Mode since this is the telephone
line. 
	VCON	The modem tells the DTE it is done. If the DTE sends the <DLE><ETX>
before the modem has finished transmitting all the data in its voice
transmit buffer, the DTE must wait for this response. 
#VBT=12		The DTE requests that DTMF digits be sent as ÒbeepsÓ with
the #VTS command while in Online Voice Command Mode, with each ÒbeepÓ
having a duration of 1.2 seconds.
	OK	The modem confirms command reception
#VTS=#		The DTE sends a ÒBEEPÓ to annotate its greeting message.
This beep is a 1.2 second long DTMF #. During this period, the no abort is
possible from the DTE, and should not be necessary.
	OK	After the modem sends the ÒBEEPÓ, it sends OK to inform the DTE
that it is ready to move on. DTMF pass through is re-enabled.
#VBS=4		The DTE asks for 4-bit compression to recorded message. The
DTE needs to work at 38,400 bps since after start and stop bits are added
the speed increases to 36,000 bps.
	OK	The modem is configured for 4-bit compression.
#VRX		The DTE instructs the modem to turn the line around and begin
recording a message from the remote.
	CONNECT	The modem sets things up and enables ADPCM data transfer to
the DTE with the current silence deletion setting.
	<Data>	ADPCM data is shipped to the DTE with shielded DTMF tones folded
in. The modem is looking for silence, busy, dial tone, and loop break. The
DTE records everything in its storage media. 
	<DLE>b	The caller has finished, hung up, and in this case, a busy
cadence was detected before anything else such as expiration of the #VSP
silence detection period. 
X		The DTE uses a key abort to respond to a busy detection.
	<DLE><ETX>
VCON	The modem is now in Online Voice Command Mode.
H		DTE sends modem to #CLS=0 with #BDR=0.


Table 7-10.	Answer Call/Record Message/Receive Fax
DTE to Modem	Modem to DTE	Description and Interpretation
#CLS=8		Configure the modem for Voice Mode. 
	OK	The modem agrees, and is now set up for voice.
#VBS=4		The DTE asks for 4-bit compression (ADPCM). The DTE needs to
work at 38,400 bps since after start and stop bits are added the speed
increases to 36,000 bps.
	OK	The modem is configured for 4-bit compression.
#VSS=2		Set silence sensitivity. (We assume #VSD=1.)
	OK	The modem confirms command reception. 
#VLS=0		This selects the telephone line, and ensures that it is
on-hook.
	OK	The modem confirms command reception, and switches in the telephone
line.
#CLS=8		This ensure things are set up for voice.
	OK	The modem confirms command reception, and is now set up for
voice.
	RING	Sometime later, the next call is received. The modem answers.
#BDR=16		The DTE knows that compression requires a 38,400 bps speed,
so it forces this as the new speed. (For this example, lets say that the
DTE was sending all commands, including this one, at 9600 bps.)
	OK	This OK message is sent at 9600 bps, but the modem then switches
to 38,400 bps. All subsequent commands are assumed to be sent at 38,400
bps. The S30 timer is now active.
A		The DTE answers.
	VCON	The modem is now in Online Voice Command Mode. DTMF and calling
tone detection is enabled.
#VTX		The DTE does not wait for any tones, and tells the modem that
it is ready to send a voice greeting at the current compression and
sampling settings. 
	CONNECT	The modem tells the DTE that it can now send data. The
modem enters Voice Transmit Mode and DTMF monitoring is still enabled as
well as ADPCM data flow.
<Data>		The DTE sends greeting message data. The modem waits 1 second
before starting to transmit to ensure uninterrupted data flow. If the
voice transmit buffer runs empty, the transmission is disabled.
<DLE><ETX>		The DTE has finished its transmission and now instructs
the modem to enter Online Voice Command Mode.
	VCON	The modem tells the DTE it is done. If the DTE sends the <DLE><ETX>
before the modem has finished transmitting all the data in its voice
transmit buffer, this response is delayed until the buffer is empty. 
#VBT=13		The DTE requests that DTMF digits be dialed as ÒbeepsÓ while in
Online Voice Command Mode, with each ÒbeepÓ having a duration of 1.3
seconds.
	OK	The modem agrees.
#VTS=
[1000,0,20],9,		The DTE sends a ÒBEEPÓ to annotate its greeting message.
This beep is a 2 second long 1000 Hz tone, followed by a 1.3 second long
DTMF 9. During this period, the DTE is locked out.
	OK	After the modem sends the ÒBEEPÓ, it sends OK to inform the DTE
that it is ready to move on. DTMF pass through is re-enabled.

Table 7-10.	Answer Call/Record Message/Receive Fax (ContÕd)
DTE to Modem	Modem to DTE	Description and Interpretation
#VRX		The DTE instructs the modem to turn the line around and begin
recording a message from the remote.
	CONNECT	The modem sets things up and enables ADPCM data transfer to
the DTE with the current silence deletion setting.
	<Data>	ADPCM data is shipped to the DTE with shielded DTMF tones folded
in. The modem is looking for silence, busy, dial tone, and loop break. The
DTE records everything in its storage media. 
	<DLE>5	The caller has finished his voice message, but is now insisting
that he be able to send us a facsimile. 
X		DTE sends `X' as key abort. If the user tried to keep talking after he
hit the DTMF 5, anything said was lost. Whatever he said before the 5 is
on disk.
	<DLE><ETX>
VCON	The modem obeys key abort. Receive Mode is canceled, and the modem
is now in Online Voice Command Mode. DTMF is still passed through.
#CLS=1		The DTE instructs the modem to pretend no voice activity has
taken place, although the modem does not hang up if the fax fails.
	OK	The modem now thinks its a Class 1 Fax modem. The DTE can now tailor
the +F settings which were not accessible until +FCLASS became 1.
A		Answer tone is generated and prompts the user on the telephone to
press the button on his fax machine to send his fax. After the successful
fax is received, the modem hangs up.

Table 7-11.	Answer Call, Determine It's a Fax
DTE to Modem	Modem to DTE	Description and Interpretation
	RING	Sometime later, the next beta-site calls. 
#CLS=8		Configure the modem for Voice Mode. 
	OK	The modem agrees, and is now set up for voice.
#VBS=4		The DTE asks for 4-bit compression (ADPCM). The DTE needs to
work at 38,400 bps since after start and stop bits are added the speed
increases to 36,000 bps.
	OK	The modem is configured for 4-bit compression.
#BDR=16		The DTE knows that compression requires a 38,400 bps speed,
so it forces this as the new speed. 
	OK	This OK message is sent at 9600 bps, but the modem then switches
to 38,400 bps. All subsequent commands are assumed to be sent at 38,400
bps. The S30 timer is now active.
#VSS =2		Set sensitivity to normal setting.
	OK	The modem confirms command reception. 
#VSD=1		This enables silence deletion. 
	OK	The modem confirms command reception.
A		Finally, the modem answers.
	VCON	The modem is now in Online Voice Command Mode. DTMF and calling
tone detection is enabled. (Note that alternatively, the DTE can go into
the Transmit or Receive mode and look for either calling tone or silence
as a means of discrimination.) The DTE waits a few seconds to give a
possible fax machine or remote data/fax modem a chance to send calling
tone without being disturbed by a voice greeting. (In this example only
calling tone is considered, which excludes a person sending a fax when he
hears answer tone.)
	<DLE>c	The modem has detected T.30 Calling tone and presents this
information to the DTE.
#CLS=1		The DTE decides to receive the fax, and tells the modem to
pretend that it just went off-hook as a Class 1 Facsimile modem. The DTE
must be able to handle Class 1 commands from here on. Note
	OK	The modem is now a Class 1 fax modem.
A		The modem pretends that it just got the incoming RING, and modem
handles the fact that it is already off-hook.

Table 7-12.	Adaptive Fax/Data/Voice; Determine Data
DTE to Modem	Modem to DTE	Description and Interpretation
	RING	Sometime later, we receive a call.
#CLS=8		Configure the modem for Voice Mode (still ADPCM). 
	OK	The modem agrees, and is now set up for voice, but the DTE can change
things during the discrimination phase.
#BDR=16		The DTE knows that the compression requires a 38,400 bps speed,
so it forces this as the new speed.
	OK	This OK message is sent at 9600 bps, but the modem then switches
to 38,400 bps. The S30 timer is now active.
#VSS=2		This enables default silence deletion. 
	OK	The modem confirms command reception.
A		The DTE answers. (Note that this is where the DTE can let another
RING go by to process Caller ID.)
	VCON	The modem is now in Online Voice Command Mode. DTMF and calling
tone detection is enabled. If fax or data calling tones are detected, the
DTE can change to Fax or Data Mode.
#VTX		The DTE immediately switches to Voice Transmit Mode to send
out a short greeting.
	CONNECT	The modem says, ÒSend me the ADPCM data.Ó
<Data>		The DTE sends a previously recorded message from a very fast
talking person: ÒHello, this is Dave. Press * to send a fax, # for help,
or leave your message at the beep.Ó Note that the caller can enter DTMF
tones at any time, which the DTE can take into account, or calling tone
can still be detected.
<DLE><ETX>		This ends the greeting message.
	VCON	The modem switches back to Online Voice Command Mode.
#VTS=#		The DTE sends # as the beep.
	VCON	The modem is still able to receive DTMF or Calling tone here.
#VRX		Enter Receive Mode. Now the modem is clocking silence, as well
as DTMF, and recording whatever the caller says.
	<DLE>s	#VSP must have been set to 35, since 3.5 seconds later the
modem sends this indication of silence period expiration. No ADPCM data
was sent to the DTE, because the data pump deleted all 3.5 seconds of
silence. This tells the DTE that nobody is talking.
!		The DTE issues a key abort to switch to Online Voice Command
Mode.
	<DLE><ETX>
VCON	The modem exits Voice Receive Mode and switches to Online Voice
Command Mode.
#CLS=0		The DTE received no voice data, just the silence indicator
after a 3.5 second wait. Since there was no calling tone and the user
never entered any DTMF tones, the DTE assumes it must be a calling data
modem. If the data handshake fails, the modem does not hang up the line
thus giving the DTE another chance to try the fax again (in this case).
	OK	The modem is now a data modem.
A		The modem pretends that it just got RING, try V.22 bis/V.42 bis,
etc. 

Table 7-13.	Originate a Call, Send Answerer a Message
DTE to Modem	Modem to DTE	Description and Interpretation
#CLS=8		Configure the modem for Voice Mode (still ADPCM). 
	OK	The modem agrees, and is now set up for voice.
#BDR=16		The DTE knows that compression requires a 38,400 bps speed,
so it forces this as the new speed.
	OK	This OK message is sent at 2400 bps, but the modem then switches
to 38,400 bps. 
#VLS=0		This ensures that the telephone line is selected.
	OK	The modem agrees. 
#VRA=45		The DTE allows 4.5 seconds for ringback to stop before assuming
that the modem thinks that the remote has answered.
	OK	The modem agrees with the DTE's assumption.
DT6807		The DTE makes a telephone call, and the modem dials and goes
through call progress. BUSY or NO DIALTONE can be detected, but in this
example, the modem gets ringback. 
	VCON	This message is sent 4.5 seconds after the third ringback cadence
is detected by the modem. The modem is in effect assuming that the remote
telephone was answered on the third ring because no fourth ringback was
detected before the #VRA time-out. The modem enters Online Voice Command
Mode, and DTMF and answer tone detection is enabled. (Note that during
this period, the modem might have detected answer tone from a data modem.
In this case, the appropriate <DLE> shielded code has to be sent prompting
the DTE to pursue a data handshake.)
#VTX		The DTE has a message to send.
	CONNECT	The modem says: Òsend it.Ó
<Data>		The DTE sends the message: ÒHi Dave. Your mother called.Ó 
<DLE><ETX>		Procedure complete.
	VCON	DTMF still active.
H		The DTE has completed its forwarding task.


A.	AT COMMAND SET SUMMARY
A.1.	BASIC AT COMMANDS

	Command	Function
A/	Re-execute command.
A	Go off-hook and attempt to answer a call.
B0	Select V.22 connection at 1200 bps.
B1	Select Bell 212A connection at 1200 bps.
C1	Return OK message.
Dn	Dial modifier.
E0	Turn off command echo.
E1	Turn on command echo.
H0	Initiate a hang-up sequence.
H1	If on-hook, go off-hook and enter command mode.
I0	Report product code.
I1	Report pre-computed checksum.
I2	Report OK.
I3	Report firmware revision, model, and interface type.
I4	Report response programmed by an OEM.
I5	Report the country code parameter.
I6	Report modem data pump model and code revision.
I7	Reports the DAA code (W-class models only).
L0	Set low speaker volume.
L1	Set low speaker volume.
L2	Set medium speaker volume.
L3	Set high speaker volume.
M0	Turn speaker off.
M1	Turn speaker on during handshaking and turn speaker off while
receiving carrier.
M2	Turn speaker on during handshaking and while receiving carrier.
M3	Turn speaker off during dialing and receiving carrier and turn speaker
on during answering.
N0	Turn off automode detection.
N1	Turn on automode detection.
O0	Go on-line.
O1	Go on-line and initiate a retrain sequence.
P	Force pulse dialing.
Q0	Allow result codes to DTE.
Q1	Inhibit result codes to DTE.
Sn	Select S-Register as default.
Sn?	Return the value of S-Register n.
=v	Set default S-Register to value v.
?	Return the value of default S-Register.
T	Force DTMF dialing.

V0	Report short form (terse) result codes.
V1	Report long form (verbose) result codes.
W0	Report DTE speed in EC mode.
W1	Report line speed, EC protocol and DTE speed.
W2	Report DCE speed in EC mode.
X0	Report basic call progress result codes, i.e., OK, CONNECT, RING, NO
CARRIER (also, for busy, if enabled, and dial tone not detected), NO
ANSWER and ERROR.
X1	Report basic call progress result codes and connections speeds (OK,
CONNECT, RING, NO CARRIER (also, for busy, if enabled, and dial tone not
detected), NO ANSWER, CONNECT XXXX, and ERROR.
X2	Report basic call progress result codes and connections speeds, i.e.,
OK, CONNECT, RING, NO CARRIER (also, for busy, if enabled, and dial tone
not detected), NO ANSWER, CONNECT XXXX, and ERROR.
X3	Report basic call progress result codes and connection rate, i.e., OK,
CONNECT, RING, NO CARRIER, NO ANSWER, CONNECT XXXX, BUSY, and ERROR.
X4	Report all call progress result codes and connection rate, i.e., OK,
CONNECT, RING, NO CARRIER, NO ANSWER, CONNECT XXXX, BUSY, NO DIAL TONE and
ERROR.
Y0	Disable long space disconnect before on-hook.
Y1	Enable long space disconnect before on-hook.
Z0	Restore stored profile 0 after warm reset.
Z1	Restore stored profile 1 after warm reset.
&C0	Force RLSD active regardless of the carrier state.
&C1	Allow RLSD to follow the carrier state.
&D0	Interpret DTR ON-to-OFF transition per &Qn:
	&Q0, &Q5, &Q6	The modem ignores DTR.
	&Q1, &Q4	The modem hangs up.
	&Q2, &Q3	The modem hangs up.
&D1	Interpret DTR ON-to-OFF transition per &Qn:
	&Q0, &Q1, &Q4,.
	&Q5, &Q6	Asynchronous escape.
	&Q2, &Q3	The modem hangs up.
&D2 	Interpret DTR ON-to-OFF transition per &Qn:
	&Q0 through &Q6	The modem hangs up.
&D3	Interpret DTR ON-to-OFF transition per &Qn:.
	&Q0, &Q1, &Q4,.
	&Q5, &Q6	The modem performs soft reset.
	&Q2, &Q3	The modem hangs up.
&F0	Restore factory configuration 0.
&F1	Restore factory configuration 1.
&G0	Disable guard tone.
&G1	Disable guard tone.
&G2	Enable 1800 Hz guard tone.
&J0	Set S-Register response only for compatibility.
&J1	Set S-Register response only for compatibility.
&K0	Disable DTE/DCE flow control.
&K3	Enable RTS/CTS DTE/DCE flow control.
&K4	Enable XON/XOFF DTE/DCE flow control.
&K5	Enable transparent XON/XOFF flow control.
&K6	Enable both RTS/CTS and XON/XOFF flow control.
&L0	Select dial up line operation.
&L1	Select leased line operation.


*  Serial interface operation only.

&M0	Select direct asynchronous mode.
&M1	Select sync connect with async off-line command mode. *
&M2	Select sync connect with async off-line command mode and enable DTR
dialing of directory zero. *
&M3	Select sync connect with async off-line command mode and enable DTR
to act as Talk/Data switch. *
&P0	Set 10 pps pulse dial with 39%/61% make/break.
&P1	Set 10 pps pulse dial with 33%/67% make/break.
&P2	Set 20 pps pulse dial with 39%/61% make/break.
&P3	Set 20 pps pulse dial with 33%/67% make/break.
&Q0	Select direct asynchronous mode.
&Q1	Select sync connect with async off-line command mode. *
&Q2	Select sync connect with async off-line command mode and enable DTR
dialing of directory zero. *
&Q3	Select sync connect with async off-line command mode and enable DTR
to act as Talk/Data switch. *
&Q4	Select Hayes AutoSync mode.
&Q5	Modem negotiates an error corrected link.
&Q6	Select asynchronous operation in normal mode.
&R0	CTS tracks RTS (async) or acts per V.25 (sync).
&R1	CTS is always active.
&S0	DSR is always active.
&S1	DSR acts per V.25.
&T0	Terminate any test in progress.
&T1	Initiate local analog loopback.
&T2	Returns ERROR result code.
&T3	Initiate local digital loopback.
&T4	Allow remote digital loopback.
&T5	Disallow remote digital loopback request.
&T6	Request an RDL without self-test.
&T7	Request an RDL with self-test.
&T8	Initiate local analog loop with self-test.
&V	Display current configurations.
&W0	Store the active profile in NVRAM profile 0.
&W1	Store the active profile in NVRAM profile 1.
&X0	Select internal timing for the transmit clock.
&X1	Select external timing for the transmit clock.
&X2	Select slave receive timing for the transmit clock.
&Y0	Recall stored profile 0 upon power up.
&Y1	Recall stored profile 1 upon power up.
&Zn=x	Store dial string x (to 35) to location n (0 to 3).
%E0	Disable line quality monitor and auto retrain.
%E1	Enable line quality monitor and auto retrain.
%E2	Enable line quality monitor and fallback/fall forward.
%L	Return received line signal level.
%Q	Report the line signal quality.



*  Serial interface operation only.

\Kn	Controls break handling during three states:
When modem receives a break from the DTE:
\K0,2,4	Enter on-line command mode, no break sent to the remote modem.
\K1	Clear buffers and send break to remote modem.
\K3	Send break to remote modem immediately.
\K5	Send break to remote modem in sequence with transmitted data.
When modem receives \B in on-line command state:
\K0,1	Clear buffers and send break to remote modem.
\K2,3	Send break to remote modem immediately.
\K4,5	Send break to remote modem in sequence with transmitted data.
When modem receives break from the remote modem:
\K0,1	Clear data buffers and send break to DTE.
\K2,3	Send a break immediately to DTE.
\K4,5	Send a break with received data to the DTE.
\N0	Select normal speed buffered mode.
\N1	Select direct mode.
\N2	Select reliable link mode.
\N3	Select auto reliable mode.
\N4	Force LAPM mode.
\N5	Force MNP mode.

+MS	Select modulation.
+H0	Disable RPI.
+H1	Enable RPI and set DTE speed to 19200 bps.
+H2	Enable RPI and set DTE speed to 38400 bps.
+H3	Enable RPI and set DTE speed to 57600 bps.

-SDR=0	Disable Distinctive Ring.
-SDR=1	Enable Distinctive Ring Type 1.
-SDR=2	Enable Distinctive Ring Type 2.
-SDR=3	Enable Distinctive Ring Type 1 and 2.
-SDR=4	Enable Distinctive Ring Type 3.
-SDR=5	Enable Distinctive Ring Type 1 and 3.
-SDR=6	Enable Distinctive Ring Type 2 and 3.
-SDR=7	Enable Distinctive Ring Type 1, 2, and 3.

-SSE=0	Disable DSVD.
-SSE=1	Enable DSVD.

A.2.	ECC COMMANDS
%C0	Disable data compression.
%C1	Enable MNP 5 data compression.
%C2	Enable V.42 bis data compression.
%C3	Enable both V.42 bis and MNP 5 compression.

\A0	Set maximum block size in MNP to 64.
\A1	Set maximum block size in MNP to 128.
\A2	Set maximum block size in MNP to 192.
\A3	Set maximum block size in MNP to 256.
\Bn	Send break of n x 100 ms.

A.3.	MNP 10 COMMANDS
)M0	Disable MNP 10 link negotiation power adjustment.
)M1	Enable MNP 10 link negotiation power adjustment.
)M2	Enable cellular mode without power level adjustment during MNP 10
link negotiation. 

*H0	Select MNP 10 link negotiation at highest rate.
*H1	Select MNP 10 link negotiation at 1200 bps.
*H2	Select MNP 10 link negotiation at 4800 bps.

-K0	Disable MNP 10 extended services.
-K1	Enable MNP 10 extended services.
-K2	Enable MNP 10 extended services detection only.
-Q0	Disable MNP 10 fallback to 2400 bps (V.22 bis)/1200 bps (V.22).
-Q1	Enable MNP 10 fallback to 2400 bps (V.22 bis)/1200 bps (V.22).
-SEC=0	Disable MNP10-EC.
-SEC=1,[<tx level>]	Enable MNP10-EC and set transmit level <tx level> 0
to 30 (0 dBm to -30 dBm).

@M0	Select initial transmit level of -26 dBm.
@M1	Select initial transmit level of -30 dBm.
@M2	Select initial transmit level of -10 dBm.
@M3 - @M10 	Select initial transmit level of -10 dBm.
@M11 	Select initial transmit level of -11 dBm.
@M12	Select initial transmit level of -12 dBm.
.
.
.
@M30 	Select initial transmit level of -30 dBm.

:E0	Disable the compromise equalizer.
:E1	Enable the compromise equalizer.
A.4.	W-CLASS COMMANDS
*B	Display list of permanently blacklisted numbers.
*D	Display list of delayed numbers.
A.5.	CALLER ID COMMANDS
#CID=0	Disable Caller ID.
#CID=1	Enable Caller ID with formatted presentation.
#CID=2	Enable Caller ID with unformatted presentation.

A.6.	FAX CLASS 1
+FCLASS=n	Service class.
+FAE=n	Data/fax auto answer
+FRH=n	Receive data with HDLC framing.
+FRM=n	Receive data.
+FRS=n	Receive silence.
+FTH=n	Transmit data with HDLC framing.
+FTM=n	Transmit data.
+FTS=n	Stop transmission and wait.
A.7.	FAX CLASS 2
+FCLASS=n	Service class.
+FAA=n	Adaptive answer.
+FAXERR	Fax error value.
+FBOR	Phase C data bit order.
+FBUF?	Buffer size (read only).
+FCFR	Indicate confirmation to receive.
+FCLASS=	Service class.
+FCON	Facsimile connection response.
+FCIG	Set the polled station identification.
+FCIG:	Report the polled station identification.
+FCR	Capability to receive.
+FCR=	Capability to receive.
+FCSI:	Report the called station ID.
+FDCC=	DCE capabilities parameters.
+FDCS:	Report current session.
+FDCS=	Current session results.
+FDIS:	Report remote capabilities.
+FDIS=	Current sessions parameters.
+FDR	Begin or continue phase C receive data.
+FDT=	Data transmission.
+FDTC:	Report the polled station capabilities.
+FET:	Post page message response.
+FET=N	Transmit page punctuation.
+FHNG	Call termination with status.
+FK	Session termination.
+FLID=	Local ID string.
+FLPL	Document for polling.
+FMDL?	Identify model.
+FMFR?	Identify manufacturer.
+FPHCTO	Phase C time out.
+FPOLL	Indicates polling request.
+FPTS:	Page transfer status.
+FPTS=	Page transfer status.
+FREV?	Identify revision.
+FSPL	Enable polling
+FTSI:	Report the transmit station ID.

A.8.	VOICE/AUDIO COMMANDS
#BDR	Select baud rate (turn off autobaud).
#CLS	Select data, fax, or voice.
#MDL?	Identify model.
#MFR?	Identify manufacturer.
#REV?	Identify revision level.
#SPK=	Speakerphone setting.
#TL	Audio output transmit level.
#VBQ?	Query buffer size.
#VBS	Bits per sample.
#VBT	Beep tone timer.
#VCI?	Identify compression method.
#VGT 	Set playback volume in the command state.
#VLS	Voice line select.
#VRA	Ringback goes away timer (originate).
#VRN	Ringback never came timer (originate).
#VRX	Voice receive mode.
#VSD	Enable silence deletion.
#VSK	Buffer skid setting.
#VSP	Silence detection period (voice receive).
#VSR	Sampling rate selection.
#VSS	Silence deletion tuner (voice receive).
#VTD	DTMF/tone reporting.
#VTM	Enable timing mark placement.
#VTS	Generate tone signals.
#VTX	Voice transmit mode.

A.9.	CELLULAR COMMANDS
^C2	Download cellular phone driver.
^I	Identify cellular phone driver.
^T6	Indicate status of cellular phone.


This page is intentionally blank.


B.	COMMON CONFIGURATION SETUP STRINGS
This appendix describes setup strings to establish commonly used
configurations.
1.	Force V.42 bis data compression with LAP-M error correction.
AT\N4%C2-K0
2.	Force V.42 bis data compression with MNP error correction.
AT\N5%C2
3.	Force MNP 5 data compression with MNP error correction.
AT\N5%C1
Note: With the setup strings in examples 1-3, if the remote is unable to
negotiate the desire rate mode, the modem will disconnect and respond with
NO CARRIER.
4.	Auto negotiate data compression and error correction.
AT&F (factory defaults) or
AT\N3%C3
In this mode, the modem prefers LAP-M over MNP 10, MNP 10 over MNP 4, and
V.42 bis over MNP 5. If error correction is not negotiated, the modem will
connect in normal mode.



This page is intentionally blank.





DIGITAL COMMUNICATIONS DIVISION
REGIONAL SALES OFFICES

Headquarters
Digital Communications Division
Rockwell International
4311 Jamboree Road
Newport Beach, CA 92660-3095

(Mailing Address)
P. O. Box C
Newport Beach, CA 92658-8902
Tel: (714) 833-4600
Fax: (714) 833-4078
Fax: (714) 833-4391



USA - Southwest
Digital Communications Division
Rockwell International
5000 Birch Street
Suite 400
Newport Beach, CA 92660-3095
Tel: (714) 833-4655
Fax: (714) 833-6898



USA - Southeast
Digital Communications Division
Rockwell International
One Copley Parkway
Suite 210
Morrisville, NC 27560
Tel: (919) 467-7703
Fax: (919) 467-6096




USA - North Central
Digital Communications Division
Rockwell International
3158 South River Road
Suite 204
Des Plaines, IL 60018
Tel: (708) 297-8875
Fax: (708) 297-3230

USA - South Central
Digital Communications Division
Rockwell International
2001 N. Collins Blvd.
Suite 103
Richardson, TX 75080
Tel: (214) 479-9310
Fax: (214) 479-9317



USA - Northeast and 
Canada East
Digital Communications Division
Rockwell International
239 Littleton Road
Suite 4B
Westford, MA 01886
Tel: (508) 692-7660
Fax: (508) 692-8185
TLX (MCI) 6502512464




USA - Northwest and 
Canada West
Digital Communications Division
Rockwell International
3600 Pruneridge Avenue
Suite 100
Santa Clara, CA 95051
Tel: (408) 249-9696
Fax: (408) 249-6518




Japan
Digital Communications Division
Rockwell International Japan Co. Ltd.
Shimomoto Building
1-46-3 Hatsudai
Shibuya-ku, Tokyo 151 Japan
Tel: (81-3) 5371-1510
Fax: (81-3)-5371-1501

Australia
Digital Communications
c/o Rockwell Systems Australia Pty. Ltd.
3 Thomas Holt Drive
P.O. Box 165
North Ryde, NSW 2113
Australia
Tel: (61-2) 805-5555
Fax: (61-2) 805-5599
TLX: AA30450

Hong Kong
Digital Communications
c/o Rockwell International (Asia Pacific) Ltd.
13th Floor, Suites 6-10
Harbour Centre
25 Harbour Road
Wanchai
Hong Kong 
Tel: (852) 827-0181
Fax: (852) 827-6488

Korea
Digital Communications Division
c/o Rockwell-Collins International Inc.
Room 1508 Textile Center Bldg.
944-31 Daechi3-Dong
(Kangnam P. O. Box 2037)
Kangnam-Ku,135-283
Seoul, Korea
Tel: (82-2) 565-2880
Fax: (82-2) 565-1440

Taiwan
Digital Communications Division
c/o Rockwell International Taiwan Company Ltd.
Room 2808
International Trade Building
333 Keelung Road, Section 1
Taipei
Taiwan 10548, R.O.C.
Tel: (886-2) 720-0282
Fax: (886-2) 757-6760
TLX: 26049 ENTTPE

Germany
Digital Communications Division
Rockwell Telecommunications GmbH
Paul-Gerhardt-Allee 50 a
81245 MŸnchen
Germany
Tel: (49-89) 829-1320
Fax: (49-89) 834-2734
TLX: 521-2650 rimd d



United Kingdom
Digital Communications
c/o Rockwell International Ltd.
Berkshire Court
Western Road
Bracknell, Berkshire
RG12 1RE
England
Tel: (44-01344) 486-444
Fax: (44-01344) 486-555



France
Digital Communications
c/o Rockwell International S.A.
Tour GAN, 16 Place de I'Iris
Cedex 13
92082 Paris La Defense 2
France
Tel: (33-1) 49-06-39-80
Fax: (33-1) 49-06-39-90



Italy
Digital Communications Division
Rockwell International
c/o Allen Bradley Italia S.r.l.
Viale De Gasperi, 126
20017 Mazzo di Rho (MI)
Italy
Tel: (39-2) 93972-360
Fax: (39-2) 93972-366


