
MICROCOM, INC.

QX/4232BIS+

Card Type                    Modem (synchronous/asynchronous)
Processor                    Z80
Processor Speed              10MHz
Maximum Onboard Memory       64KB DRAM
Maximum Data Rate            14.4Kbps
Data Bus                     Serial
Data Modulation              Bell 103A/212A

                             ITU-T V.21, V.22, V.23, V.22bis, V.32,
                             V.32bis
Error Correction/Compression MNP5, MNP10, V.42, V.42bis

[Image]

                                CONNECTIONS

         Function            Label            Function              Label

  Line out                   CN1     Volume control                  R1

  Line in                    CN2     Talk/Data switch               SW4

  AC power in                CN3     Originate/Answer switch        SW5

  RS232/422 port             CN4     Reset switch                   SW6

                        USER CONFIGURABLE SETTINGS

                  Setting                      Label         Position

  Minimum receive signal level set to -43       JP4         Pins 1 & 2
  dBm                                                         closed

  Minimum receive signal level set to -33       JP4         Pins 2 & 3
  dBm                                                         closed

  Factory configured - do not alter            JP8/A          Closed

  Factory configured - do not alter            JP8/B           Open

  Factory configured - do not alter            JP8/C           Open

  Factory configured - do not alter            JP9/A          Closed

  Factory configured - do not alter            JP9/B           Open

  Factory configured - do not alter            JP9/C           Open

                    USER CONFIGURABLE SETTINGS (CONT)

                  Setting                      Label         Position

  Pin 1 of serial port connected to signal     JP10         Pins 2 & 3
  ground                                                      closed

  Pin 1 of serial port connected to            JP10         Pins 1 & 2
  chassis ground                                              closed

  Pin 18 has no function                      JP11/A           Open

  Modem performs local analog loopback        JP11/A          Closed
  test when pin 18 goes high

  Factory configured - do not alter (for       SW3/7            On
  North America)

  Factory configured - do not alter (for       SW3/8            On
  North America)

            Note: If pin 18 is enabled, busy out must be disabled.

                            LINE TYPE SELECTION

        Setting              JP1/A            JP1/B            JP1/C

  Leased line (0 dBm)         Open             Open            Closed

  Permissive (-10 dBm)       Closed            Open             Open

    Programmable (-12         Open            Closed            Open
          dBm)

                         BUSY OUT SELECTION

        Setting                JP11/B                JP11/C

    Busy out enabled           Closed                 Open

   Busy out disabled            Open                 Closed

            Note: If busy out is enabled, pin 18 must be disabled.

  LEASED LINE TRANSMISSION LEVEL SELECTION

  Setting     SW3/1      SW3/2       SW3/3

  -2 dBm        On         On         On

  -4 dBm       Off         On         On

  -6 dBm        On        Off         On

  -8 dBm       Off        Off         On

  -10 dBm       On         On         Off

  -12 dBm      Off         On         Off

  -14 dBm       On        Off         Off

  -16 dBm      Off        Off         Off

  SWITCHED LINE TRANSMISSION LEVEL SELECTION

  Setting      SW3/4       SW3/5      SW3/6

   -2 dBm       On          On          On

   -4 dBm       Off         On          On

   -6 dBm       On          Off         On

   -8 dBm       Off         Off         On

  -10 dBm       On          On         Off

  -12 dBm       Off         On         Off

  -14 dBm       On          Off        Off

  -16 dBm       Off         Off        Off

                        CONFIGURATION MODE FUNCTION

    Mode                               Function

      0          Normal operation of modem - sets power-up defaults for
                                   various commands

      1            Sets user profile that will be loaded at power-up

      2                        Performs diagnostic tests

      3         Modifies factory default settings loaded by &F command

      4         Sets power-up defaults for V.25bis synchronous and dumb
                                   synchronous modes

            Note: The QX/4232bis+ modem can be configured by switches in
            five modes, although command configuration is preferable when
            possible. Configuration modes 1, 3, and 4 can be stored in
            NVRAM by pressing the reset switch. Mode 0 is read on reset
            or power-up. Before operating, the modems switches should be
            returned to mode 0 and the appropriate settings made.

                       CONFIGURATION MODE SELECTION

  Mode     Command    Async/Sync     SW1/1     SW1/2    SW1/3     SW1/9
            Set

   0         AT          Async         See      Off       On        On
                                     mode 0

   0      V.25bis        Async         See      On        On        On
                                     mode 0

   1        N/A           N/A         Off       Off      Off        On

   2        N/A          Async         See      On       Off        On
                                     mode 2

   2        N/A          Sync          See      On       Off       Off
                                     mode 2

   3        N/A           N/A          On       Off      Off        On

   4      V.25bis        Sync          See      On        On       Off
                                     mode 4

   4        None         Sync          See      Off       On       Off
                                     mode 4

                  Configuration Mode 0 - Normal Operation

                        USER CONFIGURABLE SETTINGS

                    Setting                       Label       Position

  Modem goes to command mode and disconnects on   SW1/1          On
  low DTR

  Modem ignores DTR                               SW1/1         Off

  Command echo enabled                            SW1/4          On

  Command echo disabled                           SW1/4         Off

  Auto-answer on one ring                         SW1/5          On

  Auto-answer disabled                            SW1/5         Off

  Command sets enabled                            SW1/8         Off

  Command sets disabled                           SW1/8          On

  Originate/Answer button determines mode         SW1/10         On

  Force answer mode                               SW1/10        Off

  Error correction result codes enabled           SW2/5         Off

  Extended result codes disabled                  SW2/5          On

  User profile loaded on reset and power up       SW2/6          On

  Factory profile loaded on reset and power up    SW2/6         Off

  Switch configuration enabled                    SW2/7         Off

  Switch configuration disabled                   SW2/7          On

  Serial port speed locked                        SW2/8         Off

  Serial port speed follows connect speed         SW2/8          On

            Note: SW2/8 has no function in V.25bis mode.

                   CD, CTS, AND DSR SIGNAL CONFIGURATION

               Setting                     SW1/6              SW1/7

    CD, CTS, and DSR forced high             On                 On

    CD normal, CTS follows CD, DSR           On                Off
             follows OH

     CD, CTS, and DSR forced high           Off                 On
        except at disconnect

    CD normal, CTS and DSR forced           Off                Off
                high

                          FLOW CONTROL SELECTION

               Setting                      SW2/1             SW2/2

        Flow control disabled                On                 On

     Bidirectional XON/XOFF flow             On                Off
           control enabled

  Bidirectional RTS/CTS flow control         Off                On
               enabled

   CTS flow control by DCE enabled           Off               Off

                  CONNECT MODE SELECTION

           Setting                SW2/3         SW2/4

     Normal mode enabled           On             On

  MNP reliable mode enabled        On            Off

  Auto-reliable mode enabled       Off            On

  LAPM or MNP reliable mode        Off           Off

                    Configuration Mode 1 - User Profile

                        USER CONFIGURABLE SETTINGS

                    Setting                       Label       Position

  Factory configured - do not alter               SW1/6         N/A

  Factory configured - do not alter               SW1/7         N/A

  Factory configured - do not alter               SW1/8         N/A

  Originate/Answer button determines mode         SW1/10         On

  Force answer mode                               SW1/10        Off

  Factory configured - do not alter               SW2/1         N/A

  Factory configured - do not alter               SW2/2         N/A

  Factory configured - do not alter               SW2/3         N/A

  Factory configured - do not alter               SW2/4         N/A

  Factory configured - do not alter               SW2/5         N/A

  Factory configured - do not alter               SW2/6         N/A

  Factory configured - do not alter               SW2/7         N/A

  Factory configured - do not alter               SW2/8         N/A

       USER PROFILE SELECTION

     Setting        SW1/4    SW1/5

  User profile 0      On      On

  User profile 1      On      Off

  User profile 2     Off      On

  User profile 3     Off      Off

                 Configuration Mode 2 - Diagnostic Testing

                              TOGGLE SWITCHES

        Function           Label             Function              Label

  Start or stop test in        SW1/1     Start or stop test in      SW4
  progress                               progress

                        USER CONFIGURABLE SETTINGS

                 Setting                      Label          Position

  Modem will perform local digital            SW1/4            Off
  loopback test

  Modem will not perform local digital        SW1/4             On
  loopback test

  Modem will perform local analog             SW1/5            Off
  loopback test

  Modem will not perform local analog         SW1/5             On
  loopback test

  SW1/5 performs local analog loopback        SW1/6            Off
  with self-test

  SW1/5 performs local analog loopback        SW1/6             On
  test

  Factory configured - do not alter           SW1/7            N/A

  Factory configured - do not alter           SW1/8            N/A

  Factory configured - do not alter           SW1/10           N/A

  Factory configured - do not alter           SW2/1            N/A

  Factory configured - do not alter           SW2/2            N/A

  Factory configured - do not alter           SW2/3            N/A

  Factory configured - do not alter           SW2/4            N/A

  Factory configured - do not alter           SW2/5            N/A

  Factory configured - do not alter           SW2/6            N/A

  Factory configured - do not alter           SW2/7            N/A

  Factory configured - do not alter           SW2/8            N/A

            Note: The modem will conduct tests in synchronous or
            asynchronous mode according to where SW1/9 was set the last
            time it was reset.

            Configuration Mode 3 - Factory Default Modification

                        USER CONFIGURABLE SETTINGS

                  Setting                      Label         Position

  Verbose result codes enabled                 SW1/6            On

  Numeric result codes enabled                 SW1/6            Off

  Pins 18 and 21 have no function              SW1/7            On

  Perform local analog loopback test when      SW1/7            Off
  pin 18 is high, remote digital loopback
  test when pin 21 is high

  \K set to 0                                  SW1/8            Off

  \K set to 5                                  SW1/8            On

  Originate/Answer button determines mode      SW1/10           On

  Force answer mode                            SW1/10           Off

  Inactivity timer disabled                    SW2/1            On

  Inactivity timer set to 15 minutes           SW2/1            Off

  Modem-to-modem flow control disabled         SW2/2            On

  Modem-to-modem flow control enabled          SW2/2            Off

  Parity checking of flow control and          SW2/3            On
  escape characters disabled

  Flow control and escape characters will      SW2/3            Off
  be processed only if their parity matches
  serial port

                         RESULT CODE CONFIGURATION

              Setting                     SW1/4               SW1/5

        Result codes enabled                On                 On

       Result codes disabled                On                 Off

  Result codes enabled on originate        Off                 N/A
                only

                             PARITY SELECTION

            Setting                SW2/4         SW2/5          SW2/6

   Modem will use eight data         On            On             On
        bits, no parity

   Modem will use seven data         On            On            Off
       bits, odd parity

   Modem will use seven data         On           Off             On
       bits, even parity

   Modem will use seven data         On           Off            Off
       bits, MARK parity

   Modem will use seven data        Off            On             On
      bits, SPACE parity

   Modem will use eight data        Off            On            Off
       bits, odd parity

   Modem will use eight data        Off           Off             On
       bits, even parity

   Modem will use eight data        Off           Off            Off
       bits, MARK parity

                              SPEED SELECTION

              Setting                      SW2/7              SW2/8

      Serial port speed set to              On                 On
     38.4Kbps; line speed set to
              14.4Kbps

      Serial port speed set to              On                 Off
     19.2Kbps; line speed set to
              14.4Kbps

   Serial port and line speeds set          Off                On
             to 9600bps

      Serial port speed set to              Off                Off
     57.6Kbps; line speed set to
              14.4Kbps

                  Configuration Mode 4 - Synchronous Mode

                        USER CONFIGURABLE SETTINGS

                  Setting                      Label         Position

       Modem goes to command mode and          SW1/1            On
       disconnects on low-to-high DTR
       transition

  Modem ignores DTR                            SW1/1            Off

  Originate/Answer button determines mode      SW1/10           On

  Force answer mode                            SW1/10           Off

  Pins 18 and 21 have no function              SW2/3            On

       Perform local analog loopback test      SW2/3            Off
       when pin 18 is high, remote digital
       loopback test when pin 21 is high

  Auto-answer on one ring                      SW2/7            Off

  Auto-answer disabled                         SW2/7            On

  Modem will match connect speeds.             SW2/8            On

  Modem will connect only at current speed.    SW2/8            Off

                          STORED NUMBER SELECTION

              Setting                      SW1/4              SW1/5

          Manual dial only                  On                 On

    Dial first stored number when           On                 Off
    Talk/Data switch is pressed

   Dial second stored number when           Off                On
    Talk/Data switch is pressed

    Dial third stored number when           Off                Off
    Talk/Data switch is pressed

                            LINE TYPE SELECTION

            Setting                 SW1/6         SW1/7          SW1/8

      Modem is connected to           On            On            On
         switched line

  Modem is connected to 2-wire       Off            On            On
          leased line

  Modem is connected to 4-wire       Off           Off            On
          leased line

  Modem is connected to 2-wire        On           Off            On
  leased line. After 6 seconds
   of receiving no input, the
     modem goes off-hook and
      attempts to connect.

  Modem is connected to 4-wire        On            On            Off
  leased line. After 6 seconds
   of receiving no input, the
     modem goes off-hook and
      attempts to connect.

                     CONNECT SPEED SELECTION

             Setting                   SW2/1           SW2/2

  Modem will connect at 14.4Kbps        On               On

  Modem will connect at 9600bps         On              Off

  Modem will connect at 4800bps         Off              On

  Modem will connect at 2400bps         Off             Off

                CD, CTS, DSR, AND RTS SIGNAL CONFIGURATION

             Setting                 SW2/4         SW2/5         SW2/6

  CD, CTS, and DSR forced high         On           On            On

     CD, CTS, and DSR normal           On           On            Off

   CD, CTS, and DSR forced high        On           Off           On
      except at disconnect

  CD normal, CTS and DSR forced        On           Off           Off
              high

     CD, CTS, and DSR normal          Off           On            On

   CD normal, CTS follows RTS,        Off           On            Off
         DSR forced high

   CD and CTS use ITU-T V.13 to       Off           Off           On
   simulate half-duplex modes,
           DSR normal

   CD and CTS use ITU-T V.13 to       Off           Off           Off
   simulate half-duplex modes,
         DSR forced high

                 DIAGNOSTIC LED(S) (POWER-UP)

    TST        OH         HS               Condition

    On        Off        Off      Firmware checksum incorrect

    On        Off        Red            RAM test failed

    On        Off       Green            Modem failed

    On         On        N/A             Modem failed

    Off       Off        Off           All tests passed

                   DIAGNOSTIC LED(S) (NORMAL OPERATION)

   LED           Color            Status               Condition

   PWR        Unidentified          On                Power is on

   PWR        Unidentified          Off               Power is off

   TST        Unidentified          On          System error has occurred
                                                 or modem is retraining

   TST        Unidentified       Blinking       Serial port is waiting to
                                                     be configured

   TST        Unidentified       One blink      Data error has occurred

   TST        Unidentified          Off             Normal operation

    OH        Unidentified          On             Modem is off-hook

    OH        Unidentified          Off             Modem is on-hook

    HS            Red               On          Modem is connected at, or
                                                serial port speed is set
                                                       to, 300bps

    HS            Red             1 blink       Modem is connected at, or
                                                serial port speed is set
                                                       to, 600bps

    HS            Red            2 blinks       Modem is connected at, or
                                                serial port speed is set
                                                      to, 1200bps

    HS            Red            3 blinks       Modem is connected at, or
                                                serial port speed is set
                                                      to, 2400bps

    HS           Green              On          Modem is connected at, or
                                                serial port speed is set
                                                      to, 4800bps

    HS           Green            1 blink       Modem is connected at, or
                                                serial port speed is set
                                                      to, 7200bps

    HS           Green           2 blinks       Modem is connected at, or
                                                serial port speed is set
                                                      to, 9600bps

    HS           Green           3 blinks       Modem is connected at, or
                                                serial port speed is set
                                                       to, 12Kbps

    HS           Green           4 blinks       Modem is connected at, or
                                                serial port speed is set
                                                      to, 14.4Kbps

    HS            N/A               Off         Modem is connected at, or
                                                serial port speed is set
                                                       to, 75bps

   DTR        Unidentified          On             DTR signal is high

   DTR        Unidentified          Off            DTR signal is low

   TXD        Unidentified       Blinking      Modem is transmitting data

   TXD        Unidentified          Off         Modem is not transmitting
                                                          data

   RXD        Unidentified       Blinking       Modem is receiving data

   RXD        Unidentified          Off          Modem is not receiving
                                                          data

                        SUPPORTED STANDARD COMMANDS

                             Basic AT Commands

  +++, comma, A/

  A, B, E, H, I, L, M, O, P, Q, T, V, W, X, Y, Z

  &D, &F, &G, &M, &P, &T, &W, &X, &Y, &Z

                           Extended AT Commands

  \A, \B, \C, \E, \J, \N, \Q, \T

  %A, %C, %E, %F, %G

                            Special AT Commands

  -J, *H, )M, @M, :E

                                S-Registers

  S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S12, S14, S16, S18, S22,
  S23, S25, S26, S27

            Note: See MHI documentation for complete information.

                         Proprietary AT Command Set

                           COMMAND SET - V.25bis

  Type:          Immediate

  Format:        [cmds] \M

  Description:   Enables the V.25bis command set.

                          DISPLAY SWITCH SETTINGS

  Type:          Immediate

  Format:        AT [cmds] %Sn [cmds]

  Description:   Displays the modems switch settings.

    Command                              Function

      %S0         Display settings of SW1/1-SW1/10.

      %S1         Display settings of SW2/1-SW2/8.

      %S2         Display settings of SW3/1-SW3/8.

                         LEASED LINE CALL RESTORAL

  Type:                  Configuration

  Format:                AT [cmds] )Pn [cmds]

  Description:           Selects whether the modem will attempt to
                         reconnect with a dial backup call to a leased
                         line MNP reliable mode connection that has
                         terminated abnormally. If the dial backup
                         reconnects successfully, the call will proceed
                         as if it had not disconnected.

        Command                              Function

          )P0            Leased line call restoral disabled.

          )P1            Leased line call restoral enabled.

                     LEASED LINE COMPROMISE EQUALIZER

  Type:                  Configuration

  Format:                AT [cmds] )En [cmds]

  Description:           Selects whether the compromise equalizer will be
                         used for leased line V.32 and V.32bis
                         connections.

        Command                              Function

          )E0             Compromise equalizer disabled.

          )E1             Compromise equalizer enabled.

                          LEASED LINE DIAL BACKUP

  Type:                  Configuration

  Format:                AT [cmds] :Nn [cmds]

  Description:           Selects whether the modem will attempt to
                         connect to the first stored number with a
                         switched line connection if the leased line
                         connection fails.

        Command                              Function

          :N0             Dial backup disabled.

          :N1             Dial backup enabled.

                  LEASED LINE DIAL BACKUP IN ANSWER MODE

  Type:                 Configuration

  Format:               AT [cmds] )Cn [cmds]

  Description:          Selects whether the modem is allowed to execute a
                        dial backup if it is in answer mode.

        Command                              Function

          )C0            Dial backup disabled in answer mode.

          )C1            Dial backup enabled in answer mode.

                    LEASED LINE MAXIMUM RETRAIN COUNTER

  Type:                  Configuration

  Format:                AT [cmds] :Gn [cmds]

  Description:           Sets the number of times the modem is allowed to
                         retrain in the time specified by the :H command
                         before it attempts a dial backup connection.

                     LEASED LINE MAXIMUM RETRAIN TIME

  Type:                  Configuration

  Format:                AT [cmds] :Hn [cmds]

  Default:               0

  Range:                 0 - 255

  Unit:                  1 minute

  Description:           Sets the amount of time in which the modem is
                         allowed to retrain the number of times specified
                         by the :G command before it attempts a dial
                         backup connection.

                     LEASED LINE ORIGINATE MODE TIMER

  Type:                  Configuration

  Format:                AT [cmds] &Vn [cmds]

  Default:               5

  Range:                 0 - 90

  Unit:                  1 minute

  Description:           Sets the amount of time that the originating
                         modem waits for an answer before attempting a
                         dial backup.

                            LEASED LINE QUALITY

  Type:                  Immediate

  Format:                AT [cmds] )F [cmds]

  Default:               N/A

  Range:                 0 - 65535

  Unit:                  N/A

  Description:           Displays the poorest quality of the phone line
                         this connection. Higher numbers indicate a
                         poorer connection.

                         LEASED LINE QUALITY CLEAR

  Type:                  Configuration

  Format:                AT [cmds] :Y [cmds]

  Description:           Clears the line quality value reported by )F so
                         that the current line quality may be monitored.

                           LEASED LINE RESTORAL

  Type:                  Configuration

  Format:                AT [cmds] )Ln [cmds]

  Description:           Selects whether the modem will attempt to
                         restore a leased line connection while connected
                         with a dial backup connection.

        Command                              Function

          )L0             Modem will not attempt to restore leased line
                          connection.

          )L1             Modem will attempt to restore leased line
                          connection.

                    LEASED LINE RESTORAL CARRIER TIMER

  Type:                  Configuration

  Format:                AT [cmds] )Wn [cmds]

  Default:               20

  Range:                 0 - 255

  Unit:                  1 second

  Description:           Sets the amount of time that the modem waits for
                         a carrier after attempting to restore a leased
                         line connection. If this time expires the modem
                         will begin a dial backup again.

                        LEASED LINE RESTORAL DELAY

  Type:                  Configuration

  Format:                AT [cmds] )Xn [cmds]

  Default:               60

  Range:                 0 - 60

  Unit:                  1 minute

  Description:           Sets the amount of time that the modem waits
                         after a successful dial backup to check the
                         leased line to see if service has been
                         re-established.

                     LEASED LINE RESTORAL RETRY DELAY

  Type:                  Configuration

  Format:                AT [cmds] )Yn [cmds]

  Default:               40

  Range:                 0 - 255

  Unit:                  1 second

  Description:           Sets the amount of time after a failed attempt
                         to re-connect to the leased line, and while it
                         is performing a dial backup, that the modem
                         watches for a carrier on the leased line. If no
                         carrier is detected within this time the modem
                         proceeds with the dial backup.

                            LEASED LINE RESTORE

  Type:          Immediate

  Format:        AT [cmds] )B [cmds]

  Description:   Initiates a leased line restoral.

                                 LINE TYPE

  Type:                  Configuration

  Format:                AT [cmds] &Ln [cmds]

  Description:           Selects what type of line the modem is connected
                         to and whether it will attempt to automatically
                         re-connect.

        Command                              Function

          &L0            Modem is connected to switched line.

          &L1            Modem is connected to 2-wire leased line.

          &L2            Modem is connected to 4-wire leased line.

          &L3            Modem is connected to 2-wire leased line. After
                         6 seconds of receiving no input, the modem goes
                         off-hook and attempts to connect.

          &L4            Modem is connected to 4-wire leased line. After
                         6 seconds of receiving no input, the modem goes
                         off-hook and attempts to connect.

                              OPERATING MODE

  Type:               Configuration

  Format:             AT [cmds] $Sn [cmds]

  Description:        Selects whether the modem will operate in
                      asynchronous or synchronous mode.

      Command                              Function

        $S0           Determined by SW1/9.

        $S1           Force asynchronous mode.

        $S2           Force synchronous mode.

                      Proprietary V.25bis Command Set

                             COMMAND SET - AT

  Type:          Immediate

  Format:        ATZ

  Description:   Enables the AT command set.

       CONNECTION SECURITY - PASSWORD SELECTION (ASYNCHRONOUS MODE)

  Type:                  Configuration

  Format:                PSW

  Description:           Changes the connection password. The user will
                         be prompted to enter the old and new passwords.
                         Passwords must be exactly five characters, case
                         insensitive.

        CONNECTION SECURITY - PASSWORD SELECTION (SYNCHRONOUS MODE)

  Type:                  Configuration

  Format:                PSWxxxxx;yyyyy

  Description:           Changes the connection password. The xxxxx
                         represents old connection password, and the
                         yyyyy is the new connection password. Passwords
                         must be exactly five characters, case
                         insensitive.

       See MICROCOM, INC. DESKPORTE FAST for a full command summary.

