PRACTICAL PERIPHERALS, INC.

PM2400SA

Card Type                Fax, Modem (asynchronous)
Chip Set                 Rockwell
Maximum Data Rate        2400bps
Data Bus                 External
Data Modulation Protocol Bell 103/212A

                         ITU-T V.22, V.22bis

                                                                      V2036

                             DIAGNOSTIC LED(S)

   LED       Color      Status                   Condition

    MR        Red         On                    Power is on

    MR        Red         Off                   Power is off

    TX        Red         On             Modem is transmitting data

    TX        Red         Off          Modem is not transmitting data

    RX        Red         On              Modem is receiving data

    RX        Red         Off           Modem is not receiving data

    CD        Red         On              Carrier signal detected

    CD        Red         Off           Carrier signal not detected

    OH        Red         On                 Modem is off-hook

    OH        Red         Off                 Modem is on-hook

    AA        Red         On                Auto-answer enabled

    AA        Red         Off               Auto-answer disabled

    AA        Red       Blinking              Phone is ringing

    HS        Red         On          Modem is operating at 4800bps or
                                                   faster

    HS        Red         Off         Modem is operating at slower than
                                                  4800bps

                       MISCELLANEOUS TECHNICAL NOTES
           Note: Diagram not available. This modem is asynchronous only,
           but if your software supports synchronous operation the modem
           will run synchronous mode.

                         Proprietary AT Command Set

              See document V2037 for complete command summary.

                          BIT-MAPPED REGISTER S21

  Format                 AT [cmds] S21=n [cmds]

  Default:               Unidentified

  Range:                 0-253

  Unit:                  Bit-mapped

  Description:           Selects jack type, CTS*/DCD/DSR* signals, low
                         DTR action, and the long space disconnect
                         function.

   Bit        Value                          Function

    0                0   Selects RJ-11, RJ-41S, or RJ45S jack

                    1    Selects RJ-12 or RJ-13 jack

    1               0    Not used

    2                0   *Software driven

                    1    *Software driven

   4, 3             00   DTR signal ignored

                    01   Modem goes to command mode on low DTR

                    10   Modem disconnects on low DTR; Auto-Answer is
                         disabled
                   11
                         Modem is initialized on low DTR

    5                0   DCD forced high

                    1    DCD normal

    6                0   *Software driven

                    1    *Software driven

    7                0   Long space disconnect function disabled

                    1    Long space disconnect function enabled

                          BIT-MAPPED REGISTER S23

  Format                AT [cmds] S23=n [cmds]

  Default:              Unidentified

  Range:                0-247

  Unit:                 Bit-mapped

  Description:          Grants/denies remote digital loopback*, controls
                        DTE rate and parity, and sets guard tone

    Bit       Value                         Function

     0              0   *Software driven

                   1    *Software driven

   2, 1            00   Sets serial port speed to 0-300bps

                   01   Not used

                   10   Sets serial port speed to 1200bps

                  11    Sets serial port speed to 2400bps

     3             0    Not used

   5, 4            00   Parity even

                   01   Space parity

                   10   Parity odd

                  11    Mark or no parity

   7, 6            00   Guard tone disabled

                   01   Guard tone 550Hz enabled

                   10   Guard tone 1800Hz enabled

                  11    Not used

                          BIT-MAPPED REGISTER S27

  Format             AT [cmds] S27=n [cmds]

  Default:           Unidentified

  Range:             0-115

  Unit:              Bit-mapped

  Description:       Selects synchronous*/asynchronous mode, clock
                     source*, and ITU-T/Bell modes.

   Bit      Value                          Function

  1, 0          00   Asynchronous mode

                01   *Software driven

                10   *Software driven

               11    *Software driven

  3, 2         00    Not used

  5, 4          00   *Software driven

                01   *Software driven

                10   *Software driven

               11    *Software driven

    6            0   ITU/T mode

                1    Bell mode

                         SOFTWARE DRIVEN COMMANDS

  Type:                 Configuration

  Note:                 These commands are used by software that allows
                        the modem to operate in synchronous mode, this
                        modem doesn’t have the hardware to support
                        synchronous mode.

        Command                              Function

      Unidentified       Smart/Dumb mode options

           &S            Ready To Send/Clear To Send options

           &R            Data Set Ready options

           &X            DTE transmit clock source