
MULTITECH SYSTEMS, INC.

MT1932ZDX/MT1932ZDXI/MT1932ZDXK

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            19.2Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     External
Fax Class                    Class I & II
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.21, V.22, V.22bis, V.23, V.32,
                             V.32bis

                             AT&T V.32terbo
Fax Modulation Protocol      ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression MNP2-5, V.42, V.42bis

                          Proprietary Command Set

                                ANSWER-BACK

  Type:          Configuration

  Format:        AT [cmds] &An [cmds]

  Example:       AT &A1<CR>

  Description:   Controls the modems ability to respond with its
                 identification.

    Command                              Function

   &A0          Disables answer-back.

      &A1        Enables answer-back.

                  AUTO-RELIABLE TIME BUFFER CONFIGURATION

  Type:          Configuration

  Format:        AT [cmds] $An [cmds]

  Example:       AT $A1 &W<CR>

  Description:   Controls the handling of incoming data during
                 auto-reliable time period.

    Command                              Function

   $A0          Data is discarded.x

      $A1        Data is buffered.

                                 BIT MODE

  Type:          Configuration

  Format:        AT [cmds] $EBn [cmds]

  Example:       AT $EB1 E1<CR>

  Description:   Selects 10- or 11-bit mode.

    Command                              Function

   $EB0         Sets 10-bit mode.

      $EB1       Sets 11-bit mode.

                               CARRIER MODE

  Type:          Configuration

  Format:        AT [cmds] &Cn [cmds]

  Example:       AT &C0 A<CR>

  Description:   Sets the function of the Carrier Detect (CD) signal.

    Command                              Function

      &C0        Forces CD high.

   &C1          CD signal follows carrier.

      &C2        Forces CD low for time in S24 when the modem
                 disconnects.

      &C4        Resets modem when CD goes low.

                            COMMAND ESCAPE TYPE

  Type:          Configuration

  Format:        AT [cmds] %En [cmds]

  Example:       AT %E3 &W<CR>

  Description:   Sets type and response of command escape sequence.

    Command                              Function

      %E0        Command escape disabled.

   %E1          TIES escape (+++AT...)

      %E2        <BREAK>AT method.

      %E3        Both TIES and BREAK methods.

      %E4        OK response to command escape disabled.

      %E5        OK response to command escape enabled.

                                COMMAND SET

  Type:          Configuration

  Format:        AT &Qn

  Example:       AT &Q1<CR>

  Description:   Selects standard Hayes or custom command sets.

    Command                              Function

   &Q0          Multi-Tech custom command set enabled.

      &Q1        Standard Hayes command set enabled.

                                COMPRESSION

  Type:          Configuration

  Format:        AT &En

  Example:       AT &E15 #L0<CR>

  Description:   Selects data compression.

    Command                              Function

      &E14       Data compression disabled.

   &E15         Data compression enabled.

                             COMPRESSION MODE

  Type:          Configuration

  Format:        AT #Ln

  Example:       AT #L2 DT555-1212<CR>

  Description:   Selects active compression protocols.

    Command                              Function

   #L0          V.42 negotiation enabled.

      #L1        MNP negotiation enabled.

      #L2        LAP-M negotiation enabled.

      #L3        LAP-M enabled, no negotiation.

                                CTS SIGNAL

  Type:          Configuration

  Format:        AT [cmds] &RFn [cmds]

  Example:       AT &RF0<CR>

  Description:   Selects the function of the CTS signal.

    Command                              Function

      &RF0       CTS is set to RTS.

   &RF1         CTS is independent of RTS.

                         DIAL STORED PHONE NUMBER

  Type:                 Immediate

  Format:               AT [cmds] Nn1 [Nn2, Nn3...]

  Example:              ATM0 N1N3N5<CR>

  Description:          Dials stored phone number(s). If the first number
                        is busy, the modem will proceed to the next
                        number in the list.

                                DSR SIGNAL

  Type:          Configuration

  Format:        AT [cmds] &SFn [cmds]

  Example:       AT &SF0<CR>

  Description:   Selects the function of the DSR signal.

    Command                              Function

   &SF0         DSR is set to CD.

      &SF1       DSR is independent of CD.

                                DTR DIALING

  Type:          Configuration

  Format:        AT [cmds] $Dn [cmds]

  Example:       AT $D1 DT555-1212<CR>

  Description:   Turns DTR dialing on and off.

    Command                              Function

   $D0          DTR dialing disabled.

      $D1        DTR dialing enabled.

                                 DTR MODE

  Type:          Configuration

  Format:        AT [cmds] &Dn [cmds]

  Example:       AT &D1<CR>

  Description:   Sets the function of the DTR signal.

    Command                              Function

      &D0        DTR is ignored.

      &D1        Modem returns to command mode on high DTR.

   &D2          DTR normal operation.

      &D3        Modem resets on high DTR.

                                DTR TIMEOUT

  Type:          Register

  Format:        AT [cmds] S24=n [cmds]

  Example:       ATS24=40<CR>

  Default:       20

  Range:         0-255

  Unit:          50 ms

  Description:   Sets the time to drop the DTR signal to hangup.

                           ERASE CALLBACK NUMBER

  Type:          Immediate

  Format:        AT [cmds] #RDNn [cmds]

  Example:       AT #RCBN05 #RDN05<CR>

  Description:   Erases the callback phone number at the memory location
                 specified.

                    ERROR CORRECTION DISABLE ON CONNECT

  Type:          Configuration

  Format:        AT [cmds] $Fn [cmds]

  Example:       AT $F1 DT555-1212<CR>

  Description:   Selects whether error correction can be disabled by a
                 <CR> while handshaking.

    Command                              Function

      $F0        Error correction handshake interrupt disabled.

   $F1          Error correction handshake interrupt enabled.

                        ESCAPE SEQUENCE BUFFER SIZE

  Type:          Register

  Format:        AT [cmds] S34=n [cmds]

  Example:       ATS34=30<CR>

  Default:       10

  Range:         0-60

  Unit:          1 byte

  Description:   Sets the size of the buffer used to store commands
                 during an escape sequence.

                       ESCAPE SEQUENCE - OUT OF BAND

  Type:          Immediate

  Format:        <BREAK> AT [cmds]<CR>

  Example:       <BREAK> AT #F1<CR>

  Description:   Puts the modem in Command Mode.

  Notes:         Do not precede this command with AT.

                 <BREAK> refers to the hardware modem break signal.

                          ESCAPE SEQUENCE TIMEOUT

  Type:              Register

  Format:            AT [cmds] S32=n [cmds]

  Example:           ATS32=30<CR>

  Default:           20

  Range:             0-255

  Unit:              1 second

  Description:       Sets the maximum amount of time the modem will wait
                     for a <CR> while executing an escape sequence.

                               FALLBACK MODE

  Type:          Configuration

  Format:        AT [cmds] #Fn [cmds]

  Example:       AT #F1 O<CR>

  Description:   Sets direction of fallback.

    Command                              Function

      #F0        Fallback disabled.

      #F1        Fallback from 19.2Kbps to 4800bps as line quality
                 degrades.

   #F2          Fallback from 4800bps to 19.2Kbps as line quality
                 improves.

                         FLOW CONTROL NORMAL MODE

  Type:          Configuration

  Format:        AT [cmds] &En [cmds]

  Example:       AT &E11 O<CR>

  Description:   Selects normal flow control.

    Command                              Function

   &E10         Normal mode disabled.

      &E11       Normal mode enabled.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] &En [cmds]

  Example:       AT &E4 &W<CR>

  Description:   Sets type of flow control used by modem.

    Command                              Function

      &E3        Flow control disabled.

   &E4          CTS/RTS flow control enabled.

      &E5        XON/XOFF flow control enabled.

                            HANDSHAKE ATTEMPTS

  Type:               Configuration

  Format:             AT [cmds] #An [cmds]

  Example:            AT #A1 #L3<CR>

  Description:        Configures the initial handshake phase.

      Command                              Function

        #A0           Attempts in order: 19.2Kbps, 16.8Kbps, 14.4Kbps,
                      12Kbps, 9600bps, 4800bps, 2400bps, 1200bps, 300bps.

        #A1           Attempts only 14.4Kbps.

        #A2           Attempts in order: 19.2Kbps, 16.8Kbps, 14.4Kbps,
                      12Kbps, 9600bps, 4800bps.

        #A3           Attempts in order: 2400bps, 1200bps, 300bps.

                               HELP SCREENS

  Type:          Immediate

  Format:        AT $Hn

  Example:       AT $H1<CR>

  Description:   Shows modem help screens.

    Command                              Function

      $H1        Shows help screen 1.

      $H2        Shows help screen 2.

      $H3        Shows help screen 3.

                            LIST CONFIGURATION

  Type:          Immediate

  Format:        AT Ln

  Example:       AT L5<CR>

  Description:   Lists modem configuration.

    Command                              Function

       L5        Lists all settings.

       L6        Lists the values of all S-registers.

       L7        Lists extended parameters.

       L8        Lists current diagnostics.

                          LOCAL SERIAL PORT SPEED

  Type:          Configuration

  Format:        AT [cmds] $SBnnn [cmds]

  Example:       AT $MB9600 $SB19200<CR>

  Description:   Sets serial port speed.

    Command                              Function

     $SB300      Sets 300baud speed.

    $SB1200      Sets 1200baud speed.

    $SB2400      Sets 2400baud speed.

    $SB4800      Sets 4800baud speed.

    $SB9600      Sets 9600baud speed.

    $SB19200     Sets 19.2Kbaud speed.

    $SB38400     Sets 38.4Kbaud speed.

    $SB57600     Sets 57.6Kbaud speed.

   $SB115200     Sets 115.2Kbaud speed.

                             LOCK SERIAL PORT

  Type:          Configuration

  Format:        AT [cmds] $BAn [cmds]

  Example:       AT $SB57600 $BA0<CR>

  Description:   Sets operation of serial port speed.

    Command                              Function

   $BA0         Serial speed locked at rate set by $SB.

      $BA1       Serial speed follows connect speed, ignoring $SB.

                                 LOOPBACK

  Type:          Configuration

  Format:        AT [cmds] &Tn [cmds]

  Example:       AT &T5<CR>

  Description:   Enables or disables remote digital loopback response.

    Command                              Function

      &T4        Loopback response enabled.

      &T5        Loopback response disabled.

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:          Configuration

  Format:        AT [cmds] &BSn [cmds]

  Example:       AT &BS1 &MB28800<CR>

  Description:   Sets the maximum transmittable block size.

    Command                              Function

      &BS0       Maximum block size is 64 characters.

   &BS1         Maximum block size is 128 characters for LAP-M, and 256
                 characters for MNP.

                                  PACING

  Type:          Configuration

  Format:        AT [cmds] &En [cmds]

  Example:       AT &E13<CR>

  Description:   Selects ENQ/ACK pacing.

    Command                              Function

      &E12       Disables ENQ/ACK pacing.

   &E13         Enables ENQ/ACK pacing.

                             PACING - ENQ/ACK

  Type:          Configuration

  Format:        AT [cmds] &En [cmds]

  Example:       AT &E9<CR>

  Description:   Selects ENQ/ACK pacing.

    Command                              Function

   &E8          Enables ENQ/ACK pacing.

      &E9        Disables ENQ/ACK pacing.

                                  REDIAL

  Type:          Immediate

  Format:        ATA:

  Example:       ATA:<CR>

  Description:   Redials the last number dialed until it is no longer
                 busy.

                           REMOTE CONNECT SPEED

  Type:          Configuration

  Format:        AT $MBnnn

  Example:       AT $MB9600 $SB19200<CR>

  Description:   Sets maximum remote connect speed.

    Command                              Function

     $MB300      Sets 300bps connect.

    $MB1200      Sets 1200bps connect.

    $MB2400      Sets 2400bps connect.

    $MB4800      Sets 4800bps connect.

    $MB9600      Sets 9600bps connect.

    $MB14400     Sets 14.4Kbps connect.

    $MB19200     Sets 19.2Kbps connect.

                          RETRANSMIT FAIL ACTION

  Type:          Configuration

  Format:        AT [cmds] $Rn [cmds]

  Example:       AT $R1<CR>

  Description:   Sets whether the modem gives up on a bad connection.

    Command                              Function

   $R0          Hang up after 12 failed retransmissions.

      $R1        Do not hang up after 12 failed retransmissions.

                        STORE PHONE NUMBER IN NVRAM

  Type:          Configuration

  Format:        AT [cmds] D<#>Nn [dialstring]

  Example:       ATD555-1212N1<CR>

  Description:   Stores a phone number in the modems memory.

                       TIME UNTIL HANG UP ON LOW DTR

  Type:             Register

  Format:           AT [cmds] S36=n [cmds]

  Example:          ATS36=5<CR>

  Default:          0

  Range:            0-255

  Unit:             1 second

  Description:      Sets the maximum amount of time the modem will wait
                    to hang up after the DTR signal goes low.

                      TIME UNTIL PICK UP ON HIGH DTR

  Type:             Register

  Format:           AT [cmds] S37=n [cmds]

  Example:          ATS37=5<CR>

  Default:          0

  Range:            0-255

  Unit:             1 second

  Description:      Sets the maximum amount of time the modem will wait
                    to pick up after the DTR signal goes high.

                            TRELLIS MODULATION

  Type:          Configuration

  Format:        AT [cmds] #Tn [cmds]

  Example:       AT #T1<CR>

  Description:   Controls Trellis Coded Modulation.

    Command                              Function

      #T0        Disables TCM.

   #T1          Enables TCM.

                                 V.42 MODE

  Type:          Configuration

  Format:        AT [cmds] &En [cmds]

  Example:       AT &E0 <CR>

  Description:   Configures the operation of V.42 mode.

    Command                              Function

      &E0        Error correction disabled.

   &E1          V.42 set to auto-reliable.

      &E2        V.42 set to reliable.

                              V.42 LOW SPEED

  Type:          Configuration

  Format:        AT [cmds] $En [cmds]

  Example:       AT $E1 <CR>

  Description:   Selects whether a V.42 connection will be attempted at
                 300bps.

    Command                              Function

   $E0          V.42 disabled at 300bps.

      $E1        V.42 enabled at 300bps.

                                 XOFF SEND

  Type:          Configuration

  Format:        AT [cmds] #Xn [cmds]

  Example:       AT #X1<CR>

  Description:   Selects how XOFF signal is sent.

    Command                              Function

   #X0          Single XOFF character sent until ready.

      #X1        Multiple XOFF characters sent until ready.

                           XON/XOFF PASS-THROUGH

  Type:          Configuration

  Format:        AT [cmds] &En [cmds]

  Example:       AT &E7 O<CR>

  Description:   Selects whether XON/XOFF signals are sent to remote
                 modem.

    Command                              Function

   &E6          XON/XOFF signals trapped by local modem.

      &E7        XON/XOFF passed through local modem.

