             

 ABOUT THIS REFERENCE CARD:

 The operational features of your modem can be accessed through direct 
 commands as well as through the menus of full-featured communications 
 software like Hayes Smartcom II and Smartcom III. For those users whose 
 applications require instructions be given to the modem directly, the 
 various sections of this card list the AT Commands that can be issued to 
 control the modem, the S-Registers that can be used to further configure 
 it, and the Result Codes the modem returns in response to commands and 
 call progress monitoring.

 This card also includes a chart outlining the modem-to-DTE cabling 
 requirements for optimum use of the modem in all its operating modes.

 The V-series System Product User's Reference provides general suggestions 
 for using command and register options to configure a V-series system 
 product to be used with a particular computer and software. This card is 
 the primary reference for the AT Commands, Result Codes, and S-Registers 
 supported by your modem.  For information on using the modem in V.25bis 
 command mode, see the CCITT V.25bis Reference Card.

 WHEN TO USE AT COMMANDS:

 Aside from selected AT Commands in a setup or initialization string within 
 your software, most communications software does not require modem 
 control with commands. Note that the use of AT Commands is not a 
 substitute for the features provided by commercial software. On-line 
 activities must be performed by software; no AT Commands are available, 
 for example, for file transfers between connected systems.

 IMPORTANT: To use the modem, even with AT Commands, communications 
 software or some program that performs "terminal emulation" is required.
 Commands cannot be issued from your computer's operating system prompt.

 COMMAND FORMAT:

 AT commands are issued from the modem's command state in the following 
 format.

 Command Prefix - AT
 
 The AT prefixes the command line to get the modem's attention, detect the 
 speed at which the computer is sending information to the serial port, 
 and recognize the character format (way the information is structured).

 Commands and Parameters:

 The command tells the modem what action to take. AT Commands are either a 
 single letter or a letter preceded by an ampersand(&). For example, the Q 
 command determines whether the modem returns result codes in response to 
 commands, and the &D command controls the modem's use of the DTR signal.

 The parameter (0,1,2,etc.) follows a command to tell the modem which 
 option to use. If a parameter is not specified, the modem assumes the 0 
 (zero) option. For example, E is the same as E0. Several commands can be 
 issued on a single line as long as it does not exceed 255 characters. 
 Although Q1 is one command, it counts as two characters in the command 
 line.

 End of Line Character:

 The <--- terminates the command line and sends the instructions from the 
 computer to the modem. The particular character used to perform this 
 function on your keyboard might be the Return key or the Enter key.

 Escape Sequence - +++

 The escape sequence returns the modem to the command state from the 
 on-line state. The escape sequence is issued on a line by itself and is 
 sent without the AT prefix and the <--- command line terminator. The escape 
 sequence includes a guard time bracketing the three characters. Both the 
 character used and the duration of the guard time can be changed, if 
 desired, by writing to S-Registers 2 and 12, respectively.

 ISSUING AT COMMANDS:

 When the modem powers up, it enters the "command state," ready to accept 
 instructions (unless command recognition has been disabled by "dumb mode" 
 configuration). The modem also enters the command state when a connection 
 is broken. When you use the D or A commands to make a connection, the 
 modem enters the "on-line state". Anything you type is sent to the modem 
 and computer on the other end of the line when the modem is in the on-line 
 state.

 To enter commands while still connected to another modem, issue the escape 
 sequence (+++). The modem will enter the command state, ready to accept 
 commands. When you are ready to go on-line again, simply issue the OO 
 command.

 AT COMMAND SUMMARY:

 V-series ULTRA Smartmodem 9600 supports the AT Commands listed on this 
 card. If you issue an AT Command not included in this listing, the modem 
 will return an ERROR result code. Always precede the command option with 
 the AT prefix and end the line with <--- (except when issuing A/ and +++).
 
 The most frequently used command is the D command and its dial modifiers 
 (see below). The D command causes the modem to originate a telephone call 
 and the dial modifiers initiate the desired features. For example, AT DT9 
 W 555-2369 <--- instructs the modem to dial in the following way. The 
 modem dials the access code 9 using the tone method (T), waits for a 
 second dial tone (W), then dials the specified number (555-2368). The 
 modem waits for a carrier tone from the modem at the other end of the 
 line. If no carrier is detected within a given time (see S-Register 7; 
 factory setting is 50 seconds), the modem automatically releases the line 
 and sends the result code NO CARRIER. If a carrier signal is detected, the 
 modem sends the result code CONNECT and goes on-line, thereby permitting 
 communication with the remote modem.

 Command options listed in bold type are those preselected in memory as 
 part of the modem's factory configuration. These options are referred to 
 as factory settings.

 COMMAND     DESCRIPTION
 -------     ------------
  A         Enter answer mode; go off hook, attempt to answer incoming
            call, and go on-line with another modem
            
  A/        Re-execute previous command line; not preceded by AT nor 
            followed by <---
            
  BO        Initiate calls using V.22 at 1200 bps
  
  B1        Initiate calls using 212A at 1200 bps
  
  B2        If originating a call using V.23, transmit at 75 bps and 
            receive at 1200 bps. If answering and NO selected, transmit 
            at 1200 bps and receive at 75 bps.

  B3        If originating a call using V.23, transmit at 1200 bps and 
            receive at 75 bps. If answering and NO selected, transmit at 
            75 bps and receive at 1200 bps.

  B15       Initiate calls using V.21 at 300 bps
  
  B16       Initiate calls using 103 at 300 bps
  
  B41       Initiate a call using V.32 at 4800 bps
  
  B42       Initiate a call using ping pong (half duplex) at 4800 bps
  
  B60       Initiate a call using V.32 at 9600 bps
  
  B61       Initiate a call using ping pong (half duplex) at 9600 bps
  
  D         Enter originate mode; go off hook and attempt to go on-line 
            with another modem


        MODIFIER                DESCRIPTION             
        --------                -----------

        0-9*#ABCD               Specifies letters, numbers, and symbols 
                                the modem will use when dialing
                        
        T                       Dials using Tone method

        P                       Dials using Pulse method

        '                       Pauses before continuing

        W                       Waits for second dial tone

        @                       Waits for quiet answer

        !                       Issues timed break recall (flash)

        R                       Places call in reverse mode (to call an 
                                originate-only modem)
                  
        ;                       Returns to command state after dialing and 
                                maintains the connection
                  
        S=n                     Dials phone number n (0-3) stored with
                                &Zn=x


 COMMAND    DESCRIPTION                    
 -------    -----------

  E0        Do not echo characters from the keyboard to the screen in 
            command state                                                

  E1        Echo characters from the keyboard to the screen in command 
            state

  H0        Hang up and place modem in command state

  H1        Go off hook and operate auxiliary relay

  I0        Display product code (3-digit number)

  I1        Calculate ROM checksum (3-digit number)

  I2        Verify ROM checksum of modem (OK or ERROR)

  L0-L1     Set low speaker volume

  L2        Set medium speaker volume

  L3        Set high speaker volume

  M0        Turn speaker off

  M1        Turn speaker on until carrier detected

  M2        Turn speaker on

  M3        Turn speaker on until carrier detected, except during dialing

  N0        When originating or answering, handshake only at speed 
            specified by S37
           
  N1        When originating, permit negotiation of a common communication 
            standard at highest associated line speed supported by both 
            modems. Begin negotiations from the DCE line speed specified 
            in S37, falling back to a lower speed if necessary. When 
            answering, fall back from V.32 or V.32 ping pong (half 
            duplex) to V.22/212A/V.22bis, then V.21/103

  N2        When originating, permit negotiation of a common communication 
            standard at highest associated line speed supported by both
            modems. Begin negotiations from the DCE line speed specified in 
            S37, falling back to a lower speed if necessary. When answering,
            fall back from V.32 or V.32 ping pong (half duplex) to 
            V.22/212A/V.22bis, then V.23/V.21/103

  COMMAND   DESCRIPTION
  -------   -----------
  
  N3        When originating, handshake only at speed specified by S37.
            When answering, fall back from V.32 or V.32 ping pong (half
            duplex) to V.22/212A/V.22bis, then V.21/103
            
  N4        When originating, handshake only at speed specified by S37.
            When answering, fall back from V.32 or V.32 ping pong (half
            duplex) to V.22/212A/V.22bis, then V.23/V.21/103

  N5        When originating, permit negotiation of a common communication
            standard at highest associated line speed supported by both
            modems. Begin negotiations from DCE line speed specified in 
            S37, falling back to a lower speed if necessary. When answer-
            ing, handshake only at speed specified by S37
            
  O0        Go to on-line state
 
  O1        Go to on-line state, initiate retrain
 
  Q0        Return result codes
 
  Q1        Do not return result codes
 
  Q2        Return result codes in originate mode, do not return result
            codes in answer mode
            
  Sr?       Read and respond with current value of register r (r=number
            of register; ? requests value)
            
  Sr=n      Set the value of register r to n (n=value within range of 
            register r)

  V0        Display result codes as numbers
 
  V1        Display result codes as words
 
  W0        Do not return negotiation progress messages
 
  W1        Return negotiation progress messages
 
  W2        Do not return negotiation progress messages; return CONNECT
            messages using modem-to-modem (DCE) speeds instead of modem-
            to-DTE speeds
            
  X0        Provide basic call progress features to enable connection, no 
            carrier, and ring detection
            
  X1        Provide basic call progress features and connection speed with
            appropriate result codes
            
  X2        Provide basic call progress features, connection speed, and 
            dial tone detection
            
  X3        Provide basic call progress features, connection speed, and
            busy signal detection
            
  X4        Provide basic call progress features, connection speed, busy
            signal and dial tone detection
            
  Y0        Do not respond to longspace disconnect
 
  Y1        Respond to longspace disconnect
 
  Z0        Reset and recall stored user profile 0 

  Z1        Reset and recall stored user profile 1
 
  &C0       Presume presence of carrier detect signal
 
  &C1       Track the status of carrier detect signal
 
  &C2       Presume presence of carrier detect signal until on-line, then 
            track status of signal
            
  &D0       Ignore the status of DTR signal
 
  &D1       Monitor DTR signal. When an on-to-off transition of DTR signal
            occurs, the modem enters command state. Return to the on-line
            state (if the connection has not been broken) when the 00 
            command is issued.
            
  &D2       Monitor DTR signal. When an on-to-off transition of DTR signal
            occurs, hang up and enter the command state 
            
  &D3       Monitor DTR signal. When an on-to-off transition of DTR signal
            occurs, hang up and perform a reset
            
  &F        Recall factory configuration as active configuration
 
  &G0       Use no guard tones
 
  &G2       Use 1800 Hz guard tones
 
  &J0       Configure for RJ-11, RJ-41S, RJ-45S telco jacks
 
  &J1       Configure for RJ-12, RJ-13 telco jacks

            FOR JACK SETTING WHEN CONFIGURED FOR MI/MIC OPERATION,
            SEE REGISTER S-92
             
  &K0       Disable local flow control
 
  &K1       Enable RTS/CTS local flow control
 
  &K2       Enable XON/XOFF local flow control
 
  &K3       Enable RTS/CTS local flow control
 
  &K4       Enable XON/XOFF local flow control
 
  &K5       Enable transparent XON/XOFF local flow control
 
  &L0       Configure for dial-up operation
 
  L1        Configure for private speechband circuit
            (conditioned leased line) operation
            
  &On       Enter X.25 PAD command state of channel n (0-3)
            from AT command state; if a parameter is not specified,
            the modem will return to the command state of the
            channel last selected
        
  &Q0       Communicate in asynchronous mode
 
  &Q1       Communicate in synchronous mode 1 - Async-to-Sync
 
  &Q2       Communicate in synchronous mode 2 - Stored Number Dial
 
  &Q3       Communicate in synchronous mode 3 - Voice/Data Switch
 
  &Q4       Communicate in synchronous mode 4 - Hayes AutoSync
 
  &Q5       Communicate in error-control mode
 
  &Q6       Communicate in asynchronous mode with automatic speed
            buffering - for interfaces requiring constant speed 
            between the DTE (computer/terminal) and the DCE (modem)
            
  &R0       Track CTS according to RTS
 
  &R1       Ignore RTS; assume presence of CTS
 
  &S0       Assert DSR signal always
 
  &S1       Assert DSR signal prior to handshake operation
 
  &S2       Assert DSR signal after handshake negotiation, but
            before CONNECT XXXXX result code sent to DTE
            
  &T0       Terminate test in progress
 
  &T1       Initiate local analog loopback
 
  &T3       Initiate local digital loopback
  
  &T4       Grant request from remote modem for remote digital loopback
 
  &T5       Deny request from remote modem for remote digital loopback
  
  &T6       Initiate remote digital loopback
 
  &T7       Initiate remote digital loopback with self test
 
  &T8       Initiate local analog loopback with self test
 
            The &T commands must be entered when the modem is 
            configured for &Q0.
            
  &U0       Enable trellis coding (V.32 9600 bps only)
 
  &U1       Disable trellis coding
 
  &V        View active configuration, user profiles, and stored
            telephone numbers
            
  &W0       Write storable parameters of current configuration in
            memory as profile 0
            
  &W1       Write storable parameters of current configuration in
            memory as profile 1
            
  &X0       Derive transmit clock signal from modem's internal 
            oscillator (internal clock signal on pin 15)
            
  &X1       Derive transmit clock signal from attached computer
            (external clock signal on pin 24)
            
  &X2       Derive transmit clock signal from receive carrier
            (slave receive clock signal on pin 15)
            
  &Y0       Specify stored user profile 0 as power-up configuration
 
  &Y1       Specify stored user profile 1 as power-up configuration
 
  &Zn=x     Store phone number x in location n (0-3)
 
 RESULT CODE SUMMARY:
 
 When you issue a command, the modem responds with a result code to
 indicate whether it understands and can act on the instructions
 (either OK or ERROR). In addition, result codes report the progress
 of a connection. With the V command options, you can choose whether
 result codes are reported as words or numbers (see the chart below);
 the factory setting is as words (V1). You can also select the set of 
 result codes you want reported during call progress with the X and W 
 command options. If you prefer not to have the modem return result codes, 
 or if the software you are using does not handle responses from the 
 modem, you can turn off result codes with the Q1 command option.
 
 COMMAND RESPONSE AND CALL PROGRESS MONITORING:
 
 The factory setting enables the extended set of result codes for call 
 progress monitoring (X4). When set up in this way, the modem performs and 
 reports full call progress monitoring (RING, NO CARRIER, NO DIALTONE, and 
 BUSY). It also indicates the speed of the connection (CONNECT 1200 as 
 opposed to simply CONNECT).
 
 NUMBER     WORD               EXPLANATION
 ------     ----               -----------
 
   0        OK                 Command executed
   
   1        CONNECT            Connection at 0 to 300, 1200,
                               1200/75, 75/1200, 2400, 4800
                               9600, 19200, or 38400 bps is X0
                               selected; otherwise, at 0-300 bps
                               
   2        RING               Ring signal indicated
   
   3        NO CARRIER         Carrier signal not detected, or lost
   
   4        ERROR              Invalid command, checksum, error in
                               command line or command line exceeds
                               255 characters
                               
   5        CONNECT 1200       Connection at 1200 or 1200/75, 75/1200,
                               bps (disabled by X0)
                               
   6        NO DIALTONE        No dial tone detected. Enabled by X2 or
                               X4, or W dial modifier
                               
   7        BUSY               Engaged (busy) signal detected. Enabled
                               by X3 or X4
                               
   8        NO ANSWER          No silence detected when dialing a system
                               not providing a dial tone. Enabled by @
                               dial modifier
                               
  10       CONNECT 2400        Connection at 2400 bps (disabled by X0)
  
  11       CONNECT 4800        Connection at 4800 bps (disabled by X0)
  
  12       CONNECT 9600        Connection at 9600 bps (disabled by X0)
  
  14       CONNECT 19200       Connection at 19200 bps (disabled by X0)
  
  22       CONNECT 1200/75     Connection at 1200 bps when transmitting
                               and 75 bps when receiving
                               
  23       CONNECT 75/1200     Connection at 75 bps when transmitting and
                               1200 bps when receiving
            
  28       CONNECT 38400       Connection at 38400 bps (disabled by X0)
  
 NEGOTIATION PROGRESS MESSAGES:
 
 V-series system products report special result codes during error-control
 negotiation. Whether or not these messages are displayed is selected with 
 the W command. The factory setting is messages disabled (W0) to avoid 
 conflict with software programs that do not support this additional level 
 of call progress monitoring.
 
 NUMBER     WORD               EXPLANATION
 ------     ----               -----------
 
  40        CARRIER 300        Carrier detected at 300 bps
  
  44        CARRIER 1200/75    Carrier detected, at 1200 bps when sending
                               and at 75 bps when receiving
  
  45        CARRIER 75/1200    Carrier detected, at 75 bps when sending
                               and at 1200 bps when receiving

  46        CARRIER 1200       Carrier detected at 1200 bps
  
  47        CARRIER 2400       Carrier detected at 2400 bps
  
  48        CARRIER 4800       Carrier detected at 4800 bps
  
  50        CARRIER 9600       Carrier detected at 9600 bps
  
  66        COMPRESSION:       MNP5 compression negotiated
            CLASS 5
            
  67        COMPRESSION:       V.42bis compression negotiated 
            V.42BIS

  68        COMPRESSION:       Hayes Adaptive Data
            ADC                Compression negotiated
            
  69        COMPRESSION:       No compression negotiated
            NONE

  70        PROTOCOL:          Asynchronous mode
            NONE
            
  71        PROTOCOL:ERROR-    Error-control mode with LAPB protocol
            CONTROL/LAP-B

  72        PROTOCOL:          Error-control mode with extended
            CONTROL/LAP-B/HDX  protocol in half-duplex

  73        PROTOCOL: ERROR-   Error-control mode with AFT
            CONTROL/AFT
            
  74        PROTOCOL:          Synchronous X.25 connection established
            X.25/LAP-B         with a carrier speed of 1200, 2400, 4800,
                               or 9600 bps

  75        PROTOCOL:          Synchronous X.25 half-duplex connection
            X.25/LAP-B/HDX     established with a carrier speed of 4800
                               or 9600 bps
                               
  76        PROTOCOL:X.25/     Asynchronous X.25 connection
            X.25/LAP-B/AFT     Established; AFT used

  77        PROTOCOL:          V.42 LAP-M
            LAP-M
            
  78        PROTOCOL:          V.42 LAP-M with half-duplex
            LAP-M/HDX
            
  79        PROTOCOL:          V.42 LAP-M with AFT
            LAP-M/AFT
            
  80        PROTOCOL:          Alternative protocol (MNP compatible)
            ALT
            
  91        AUTOSTREAM:        Multiplexing of muliple virtual channels
            LEVEL 1
            
  92        AUTOSTREAM:        Transparent control of one PAD
            LEVEL 2            (non-simultaneous)
            
  93        AUTOSTREAM:        Transparent control of all PADs
            LEVEL 3            (simultaneous)
            
 S-REGISTER SUMMARY:

 S-Registers are special memory locations that hold values used by the 
 modem for configuration and operating parameters. All V-series system 
 products incorporate the group of S-Registers associated with Smartmodem 
 product functions. These registers serve as counters, timers, and 
 frequently used ASCII characters. A second group, associated with 
 V-series functions, are used to configure the modem's feature 
 negotiation options. A third group adjusts various modem PAD options.
 
 Changes to S-Register values can be made with the Sr=n command and read 
 with the Sr? command. For a complete description of each S-Register, see 
 the V-series System Product User's Reference. Factory-set values are 
 indicated by bold type.
 
 SMARTMODEM REGISTERS:

 These registers can be adjusted to suit the desired configuration of the 
 modem within the range of values indicated in the Range/Units column 
 below. A + in the Factory Setting column indicates the value of this 
 register cannot be stored as part of a user-defined profile. When the 
 modem is reset, the factory setting for this register will be recalled 
 from memory.

                                                         FACTORY
 REGISTER   DESCRIPTION                   RANGE/UNITS    SETTING
 --------   -----------                   -----------    -------
   S0       Select ring to answer on      0-255 rings       0                                                                                                                          
               
   S1       Ring count (incremented       0-255 rings       0+
            with each ring)

   S2       Escape sequence character     0-127 ASCII       43
   
   S3       Carriage return character     0-127 ASCII       13+

   S4       Line feed character           0-127 ASCII       10+
   
   S5       Back space character          0-32, 127 ASCII    8+

   S6       Wait before blind dialing     2-255 sec          2
   
   S7       Wait time for carrier         1-255 sec         50
   
   S8       Duration of delay for         0-255              2
            comma
            
   S9       Carrier detect response time  1-255 1/10 sec     6
   
  S10       Delay carrier loss to hang    1-255 1/10 sec    14
            up 

  S11       Duration/spacing of tones     50-255 msec       95
  
  S12       Escape sequence guard time    0-255 1/50 sec    50
  
  S18       Select test timer             0-255 sec          0
  
  S25       DTR change detect time        0-255 1/100 secY   5
  
  S26       RTS/CTS delay                 0-255 1/100 sec    1
  
  S30       Automatic timeout. This       0-255 10 sec       0
            register monitors the 
            activity on the line. The
            factory setting is 0, timer
            disabled

            Y When the modem is configured for synchronous operation,
            and until on-line, units are measured in seconds rather 
            than in 1/100 seconds.

 V-SERIES REGISTERS:
 
 The values held in the S-Registers described below select between 
 several operating conditions. The values written to these registers 
 (except the status response registers S85 and S86) can be stored in 
 memory as part of a user-defined profile with the &W command options.
 
 REGISTER S36:
 
 Negotiation fallback - When the initial attempt to connect in 
 error-control mode fails, this register specifies the subsequent action 
 that should be taken.
 
 VALUE          EXPLANATION
 -----          -----------
 
   0            Hang up
 
   1            Attempt a standard asynchronous connection (&Q0)
 
   3            Attempt an asynchronous connection using automatic
                speed buffering (&Q6)
                
   4            Attempt a V.42 Alternative Protocol connection
                (MNP compatible); if negotiation fails, hang up
                
   5            Attempt a V.42 Atlernative Protocol connection 
                (MNP compatible); if negotiation fails, attempt
                a standard asynchronous connection
                
   7            Attempt a V.42 Alternative Protocol connection
                (MNP compatible); if negotiation fails, attempt
                an asynchronous connection using automatic
                speed buffering
                
 NOTE: The selected fallback option can be initiated immediately with 
       Register S48. For example, a connection attempt using the
       Alternative Protocol can be forced by setting S48=128 and
       S36=5 or 7.
       
 REGISTER S37:
 
 Maximum DCE line speed - selects the speed (for all modes except V.25bis) 
 at which the modem attempts to connect with a remote modem; speed will be
 the highest DCE speed supported by both modems not exceeding the speed 
 specified by this register. (See S93 for V.25bis modes).
 
 VALUE          EXPLANATION                
 -----          -----------
 
   0            Speed of last AT Command issued
   
   1            75 bps
   
   2            110 bps
   
   3            300 bps
   
   5            1200 bps
   
   6            2400 bps
   
   7            4800 bps
   
   9            9600 bps
   
 REGISTER S38:
 
 Delay before forced hang up - specifies the number of seconds the modem 
 waits when in error-control mode (&Q5) before performing the disconnect 
 operation after receiving the command to hang up or an on-to-off 
 transition of DTR. The range of this register is 0-255 seconds; the 
 factory setting is 20 seconds. If the register is set to a value between 0 
 and 254, the modem will wait that number of seconds, or until all data 
 has been transferred, before hanging up. If the register is set to 255, 
 the modem does not hang up until all data is transferred.

 REGISTER S46:
 
 Error-control protocol selection - specifies the error-control method 
 used for subsequent connections
 
 VALUE          EXPLANATION
 -----          -----------
 
   0            Either LAPM or fallback to LAPB
   
   1            LAPB only
   
   2            LAPM or fallback to LAPB; use data compression+
   
   3            LAPB with data compression+
   
   6            X.25 or fallback to LAPB; use data compression+
   
  136           LAPM only
  
  138           LAPM with data compression+
  
  134           X.25
  
 + The technique negotiated is determined by capabilities and 
 configuration of both modems. V.42bis is attempted first, then Hayes 
 Adaptive Data Compression. If neither method is supported by both modems, 
 or if either modem has compression disabled, no compression will be used.
 
 REGISTER S48:
 
 Feature negotiation action - selects how feature negotiation is used when 
 making connections with the remote system. The negotiation process can be 
 tailored to suit a connection or bypassed altogether. For example, when 
 the capabilities of the remote modem are known, negotiation is 
 unnecessary. The factory setting is 7, negotiation enabled.
 
 VALUE          EXPLANATION
 -----          -----------
 
   0            Negotiation disabled; presume the remote modem is 
                configured for and has the capabilities necessary for 
                the connection selected with S46

   3            Negotiation enabled, but originating modem remains silent
                during detection phase for connections with MNP modems;
                defeats connection sequence with other V.42 modems
                
   7            Negotiation enabled
   
  128           Negotiation disabled; forces fallback options specified
                in S36 to be taken immediately
                
 REGISTER S49:
 
 Buffer lower limit - specifies the minimum size of the buffer used in 
 error-control or automatic speed buffering mode. The range is 1-249 
 bytes; the factory setting is 8.
 
 REGISTER S50 :

 Buffer upper limit - specifies the maximum size of the buffer used in 
 error-control or automatic speed buffering mode. The range is 2-250 
 bytes; the factory setting is 16.
 
 REGISTER S63:
 
 Leased line carrier level - selects the carrier power level in dBm for 
 leased line operation. This register specifies a carrier level value that 
 is not to be exceeded. The range for this register is 0-15 (0 dBm to
 -15 dBm). The factory setting is 0.
 
 REGISTER S69:

 Link layer window size - sets the number of frames (packets) sent between 
 acknowledgements from the remote system. The range is 1-15 with a factory 
 setting of 15. LAPM connections use a window size of 1-15; LAPB 
 connections and X.25 connections use a window size of 1-8. If a LAPB or 
 X.25 connection is made, any value greater than 8 is treated as 8.
 
 REGISTER S70:
 
 Maximum number of retransmissions - determines how many times the modem 
 will retransmit a frame. The range is 0-255 retries with a factory 
 setting of 10.
 
 REGISTER S71:
 
 Link layer timeout - sets the delay between retransmissions to the remote 
 system. The range is 1-255 1/10 seconds, with a factory setting of 2 (200 
 milliseconds).
 
 REGISTER S72:
 
 Loss of "flag idle" timeout - specifies the interval between idle flags. 
 The range is 1-255 seconds with a factory setting of 30.
 
 REGISTER S73:
 
 No activity timeout - specifies the period of inactivity (no data, only 
 good carrier and flag idle received) before the modem sends a query (an 
 "RR") to the remote modem to verify that it is operating properly. The 
 range is 1-255 seconds with a factory setting of 5.
 
 REGISTER S82:
 
 Break signaling technique - selects a method of break signal handling for 
 V.42 communications: in sequence, expedited, and destructive. Break 
 signals provide a way for you to get the attention of the remote host. 
 The break type used depends on your application.
 
 VALUE          EXPLANATION
 -----          -----------

   3            "Expedited" signaling regardless of its sequence in data
                sent and received; data integrity maintained
                
   7            "Destructive" signaling regardless of its sequence in 
                data sent and received; data in process at time is 
                destroyed
                
  128           "In sequence" signaling as data is sent and received; data 
                integrity maintained ahead of and after break.
                
 REGISTER S84:
 
 Adaptive start up negotiation (ASU) - selects the adaptive start up 
 method to be negotiated for subsequent connections.
 
 VALUE          EXPLANATION
 -----          -----------
 
   0            Do not negotiate ASU connection
   
  128           Negotiate ASU with fixed start up
  
  129           Negotiate ASU with fast start up on both sides
  
  130           Negotiate ASU with smooth start up on both sides
  
  131           Negotiate ASU with configuring modem using fast
                start up and the other modem using smooth start up
                
  132           Negotiate ASU with configuring modem using smooth
                start up and the other modem using fast start up
                
 REGISTER S85:
 
 ASU negotiation report - indicates which adaptive start up method has
 negotiated for the current connection. To read this register, issue the 
 escape sequence to place the modem in the command state, then issue 
 ATS85?<---. The modem will report one of the values below.
 
 CODE           EXPLANATION
 ----           -----------
 
  0             ASU not negotiated; fixed start up in use

 128            ASU negotiated with fixed start up
  
 129            ASU negotiated with fast start up on both sides
                                
 130            ASU negotiated with smooth start up on both sides
              

 131            ASU negotiated with reporting modem using fast start up
                and the other modem using smooth start

 132            ASU negotiated with reporting modem using smooth start up
                and the other modem using fast start up
  
 REGISTER S86:
 
 Connection failure cause code - helps determine the cause of a connection
 failure. When the modem issues a NO CARRIER result code, a value is
 written to this S-Register. To read this register following the connection 
 failure, issue ATS86 <---. The modem will report one of the values below.
 
 CODE           EXPLANATION
 ----           -----------
 
  0             Normal hang up; no error occurred
  
  4             Physical carrier loss
  
  5             Feature negotiation failed to detect presence of another 
                error-control modem at the other end      

  6             Other error-control modem did not respond to feature 
                negotiation message sent by this modem
                
  7             Other modem is synchronous-only; this modem is 
                asynchronous-only
                
  8             Modems could not find a common framing technique
  
  9             Modems could not find a protocol in common
  
 10             Incorrect Feature negotiation message sent by other modem
 
 11             Synchronous information (data or flags) not received from 
                other modem. Modem waited 30 seconds before hanging up
                
 12             Normal disconnect initiated by other modem
 
 13             Other modem did not respond after many transmissions of the 
                same message. Modem made 10 attempts then hung up
 
 14             Protocol violation occurred
 
 15             Compression failure
 

 REGISTER S92:
 
 MI/MIC operation - enables (chooses method) or disables the mode
 indicate/mode indicate common interface. The settings available for this 
 register support various combinations of edge and level detection in 
 either originate or answer mode with ring indicator (RI) pulse enabled or 
 disabled. Note that setting this register to a value other than the 
 factory setting (0) automatically redefines the jack setting specified 
 with the &J command.
 
 VALUE          EXPLANATION
 -----          -----------
 
  0             MI/MIC disabled
  
  1             level triggered, originate mode, RI pulse enabled
  
  3             edge triggered, originate mode, RI pulse enabled
  
  5             level triggered, answer mode, RI pulse enabled
  
  7             edge triggered, answer mode, RI pulse enabled
  
  9             level triggered, orginate mode, RI pulse disabled
  
 11             edge triggered, originate mode, RI pulse disabled
 
 13             level triggered, answer mode, RI pulse disabled
 
 15             edge triggered, answer mode, RI pulse disabled
 
 REGISTER S93:
 
 V.25bis DTE interface speed - selects the speed used when the modem is 
 configured for V.25bis mode. When autobauding in any mode other than 
 V.25bis, the modem uses the value held in S37.

 VALUE          EXPLANATION
 -----          -----------
 
   3            300 bps
   
   5            1200 bps
   
   6            2400 bps
   
   7            4800 bps
   
   9            9600 bps
   
 REGISTER S94:
 
 Command mode selector - provides an alternative to setting internal DIP 
 switches when choosing between the AT command mode (factory setting) and 
 the various CCITT V.25bis command modes supported by the modem. To use 
 this register, DIP switches 3 and 4 must both be in the UP position 
 (factory setting).
 
 VALUE          EXPLANATION
 -----          -----------
 
   0            Standard AT command operation (factory setting)
   
   1            Asynchronous V.25bis using addressed access
   
   2            Synchronous V.25bis (HDLC framing) using addressed access
   
   3            Synchronous V.25bis (Character framing) using addressed 
                access

   5            Asynchronous V.25bis using direct access
   
   6            Synchronous V.25bis (HDLC framing) using direct access
   
   7            Synchronous V.25bis (Character framing) using direct 
                access
   
   9            Asynchronous V.25bis using addressed access with EBCDIC 
                character set option

  10            Synchronous V.25bis (DHLC framing) using addressed access 
                with EBCDIC character set option

  11            Synchronous V.25bis (Character framing) using addressed 
                access with EBCDIC character set option

  13            Asynchronous V.25bis using direct access with EBCDIC 
                character set option

  14            Synchronous V.25bis (HDLC framing) using direct access 
                with EBCDIC character set option

  15            Synchronous V.25bis (Character framing) using direct 
                access with EBCDIC character set option

 REGISTER S95:
 
 Negotiation message options - enables various result codes that indicate 
 the sequence of events in the establishment of an error-control 
 connection (these are listed under "Result Codes"). This register does 
 not affect the way in which the modem negotiates the connection; it 
 merely enables message options. The factory setting for this register is 
 value 0, not bits selected. To enable any combinatin of the bits, add the 
 values(s) to the right of the bit number and set the register to this 
 sum. Note that changing the W command setting does not affect the value 
 set for this register.
 
 BIT     VALUE        EXPLANATION
 ---     -----        -----------
 
  0        1          Use speed of DTE-to-modem connection when reporting
                      DCE line speed (CARRIER message).
                      
  1        2          Append "/ARQ" to CONNECT result code when an 
                      error-control connection is made

  2        4          Enable CARRIER messages
  
  3        8          Enable PROTOCOL messages
  
  4       16          Enable AUTOSTREAM messages
  
  5       32          Enable COMPRESSION messages
  
 X.25 PAD REGISTERS:
 
 The following registers are used only for X.25 packet switched calls.  
 Their values do not affect other connections.
 
 REGISTER S53:
 
 Global PAD configuration - defines a set of behavior switches that 
 control the X.25 PAD and all four virtual channels.
 
 VALUE          EXPLANATION
 -----          -----------
 
   0            CCITT compatibility
   
   1            CCITT compatibility; PAD prompt is an asterisk and is 
                preceded by the channel number (e.g.,1*)
   
   2            Fixed user interface; PAD prompt is a hyphen
   
   3            Fixed user interface; PAD prompt is a hyphen preceded by 
                the channel number (e.g.,1-)
   
   4            Fixed control interface; PAD prompt is a hyphen
   
   5            Fixed control interface; PAD prompt is a hyphen preceded 
                by the channel number

   6            Fixed user and fixed control interface; PAD prompt is a 
                hyphen

   7            Fixed user and fixed control interface; PAD prompt is a 
                hyphen preceded by the channel number

 REGISTERS S74, S75:
 
 Minimum incoming logical channel number - S74 (upper two decimal digits) 
 and S75 (lower two decimal digits) combine to specify the lowest incoming 
 logical channel number the packet layer will accept and report. The range 
 for S74 is 0-40 (in units of 100) with a factory setting of 0. The range 
 for S75 is 0-99 with a factory setting of 1. For example, setting S74=10 
 and S75=60 specifies 1060 as the lowest incoming logical channel number 
 the packet layer will accept and report.
 
 REGISTERS S76, S77:
 
 Maximum incoming logical channel number - S76 (upper two decimal digits) 
 and S77 (lower two decimal digits) combine to specify the highest 
 incoming logical channel number the packet layer will accept and report. 
 The range for S76 is 0-40 (in units of 100) with a factory setting of 40. 
 The range for S77 is 0-99 with a factory setting of 95. For example, 
 setting S76=40 abd /S77=90 specifies 4090 as the highest incoming logical 
 channel number the packet layer will accept and report.
 
 REGISTERS S78,S79:
 
 Outgoing logical channel number - S78 (upper two decimal digits) and S79 
 (lower two decimal digits) combine to specify the outgoing logical 
 channel number the packet layer will use to place a call. The range for 
 S78 is 0-40 (in units of 100) with a factory setting of 0. The range for 
 S79 is 0-99 with a factory setting of 16. For example, setting S78=30 and 
 S79=75 specifies 3075 as the outgoing logical channel number the packet 
 layer will use.
 
 REGISTER S80:
 
 Packet layer N20 parameter - sets the maximum number of times a restart 
 request can be retransmitted. The range is 0-255 with a factory setting 
 of 1.
 
 REGISTER S81:
 
 Packet layer T20 parameter - sets the maximum duration (in 10 second 
 increments) the transmitter waits for acknowledgement of a restart 
 request frame before initiating a recovery procedure. The range is 0-255 
 with a factory setting of 18 (180 seconds).
 
 PAD COMMANDS FOR X.25 CONNECTIONS:
 
 Although calls to an X.25 Packet Switched Network are placed using the D 
 command, once connected, calls are made from one of the modem's four 
 channels using a set of command instructions specific to CCITT triple-X 
 PADs. For descriptions of the commands used with X.25 connections, refer 
 to the V-series System Product User's Reference.
 
 DTE INTERFACE CONNECTION:

 Proper connections between the modem and the computer or other device on 
 which it is installed are mandatory for establishing connections and 
 maintaining data integrity during communications.
 
 The chart below details the Data Terminal Equipment (DTE) interface 
 connector pin assignments and circuit descriptions of each signal for the 
 modem's DTE interface connection. Both the EIA (Electronic Industry of 
 American) and the CCITT V.24 standard nomenclature are provided. This 
 information should be used to determine the cabling requirements for your 
 application. If you are unable to purchase a cable meeting your needs, 
 contact Hayes Customer Service.
 
 PIN     EIA     V.24     SIGNAL DIRECTION    DESCRIPTION
 ---     ---     ----     ----------------    -----------
 
  1      AA      101      N/A                 Protective Ground

  2      BA      103      To modem            Transmit Data

  3      BB      104      From modem          Receive Data

  4      CA      105      To modem            Request To Send

  5      CB      106      From modem          Clear To Send

  6      CC      107      From modem          Data Set Ready

  7      AB      102      N/A                 Signal Ground

  8      CF      109      From modem          Data Carrier Detect

 12      CI      112      From modem          Data Signal Rate

 15      DB      114      From modem          Transmitter Clock

 17      DD      115      From modem          Receiver Clock

 20      CD      108.2    To modem            Data Terminal Ready

 22      CE      125      From modem          Ring Indicator

 23      CI      112      From modem          Data Signal Rate

 24      DA      113      To modem            Transmitter Clock

 NOTE: In a synchronous mode, pins 15,17, and 24 carry signal element 
 timing. In AutoSync mode, pin 22 carries an end-of-frame signal. Some 
 hardware and software monitor this circuit and pin 20 for modem control;
 Hayes Smartcom products do not. When using RTS and CTS local flow 
 control, pin 4 and pin 5 must be supported.
 
 EXPERIENCING DIFFICULTIES?
 
 The following suggestions may answer your questions before you go to more 
 technically detailed sources such as the V-series System Product User's 
 Reference, or to your hardware manuals. Your first reference should 
 always be your software's manual as the software controls the operation 
 of the modem.
 
 Check for proper use of communication signals:
 
 Refer to your computer and software manuals to determine whether the 
 modem's response to signals needs to be adjusted with AT commands. For 
 example, the requirements for Data Terminal Ready and Carrier Detect 
 signaling (controlled by the &D2 and &C1 commands, respectively) vary 
 between communication environments. The way in which the computer and the 
 software use signals will determine how the modem should respond to or 
 control them.
 
 Verify the appropriate communication standard:
 
 The modem uses the B command options to select between various 
 communication standards (see the B command listing on this card and the 
 Installation Guide for communication standards supported by your modem). 
 Some remote systems require that a particular communication standard and 
 associated speed be selected.
 
 Adjust modem's command response:
 
 Some computer and software combinations do not react as expected when the 
 modem responds to commands and/or provides call progress monitoring with 
 result codes. Use the X,V,W, and Q commands to configure the modem's 
 responses to meet these needs.
 
 Verify adequate use of local flow-control:
 
 When using the modem in error-control mode (&Q5) or in asynchronous mode 
 with speed buffering (&Q6), some method of flow-control is necessary. 
 The method should be selected based on the capabilities of the software 
 and the requirements of the attached device (see the &K command 
 options). 