
PRACTICAL PERIPHERALS, INC.

PM2400

Card Type                Modem (asynchronous)
Chip Set                 Unidentified
Maximum Data Rate        2400bps
Data Bus                 8-bit ISA
Data Modulation Protocol Bell 103/212A

                         ITU-T V.22

                                                                      V2037

                    SERIAL PORT ADDRESS

    Setting         IRQ           SW1/A          SW1/B

  COM1 (3F8h)        4              On            On

  COM2 (2F8h)        3             Off            Off

  COM3 (3E8h)        4              On            Off

  COM4 (2E8h)        3             Off            On

 MISCELLANEOUS TECHNICAL NOTES
           Diagram not available

                         Proprietary AT Command Set

                          BIT-MAPPED REGISTER S14

  Format:             AT [cmds] S14=n [cmds]

  Default:            170

  Range:              0-174

  Unit:               Bit-mapped

  Description:        Controls echo, result codes and display, dial mode,
                      and answer/originate mode.

   Bit       Value                         Function

    0             0   Not used

    1              0  Command echo disabled

                  1   Command echo enabled

    2              0  Result codes enabled

                  1   Result codes disabled

    3              0  Display result codes in numeric format

                  1   Display result codes in verbose format

    4             0   Not used

    5              0  Tone dial enabled

                  1   Pulse dial enabled

    6             0   Not used

    7              0  Answer mode enabled

                  1   Originate mode enabled

                          BIT-MAPPED REGISTER S21

  Format                 AT [cmds] S21=n [cmds]

  Default:               0

  Range:                 0-185

  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

   2, 1            00    Not used

   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    Not used

     7               0   Long space disconnect function disabled

                    1    Long space disconnect function enabled

                          BIT-MAPPED REGISTER S22

  Format                 AT [cmds] S22=n [cmds]

  Default:               118

  Range:                 0-255

  Unit:                  Bit-mapped

  Description:           Controls speaker volume and controls, limits
                         results codes, and pulse dial make/break ratio.

    Bit       Value                          Function

   1, 0             00   Volume off

                    01   Low level volume

                    10   Medium level volume

                   11    High level volume

   3, 2             00   Speaker off

                    01   Speaker off on carrier

                    10   Speaker always on

                   11    Speaker on during handshake

   6 - 4           000   Basic result codes only enabled

                   100   Basic and connection speed result codes enabled

                   101   Basic and connection speed result codes and
                         dialtone detection enabled
                   110
                         All result codes except dialtone detection
                  111    enabled

                         All result codes enabled

     7               0   39/61ms at 10pps (North America)

                    1    33/67ms at 10pps (Europe)

                          BIT-MAPPED REGISTER S23

  Format                AT [cmds] S23=n [cmds]

  Default:              7

  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   Remote digital loopback denied

                   1    Remote digital loopback allowed

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

                   01   Sets serial port speed to 600bps

                   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:              64

  Range:                0-64

  Unit:                 Bit-mapped

  Description:          Selects ITU-T/Bell modes

   Bit       Value                          Function

  5 - 0       000000   Not used

    6               0  ITU/T mode

                   1   Bell mode

                                   DIAL

  Type:                  Immediate

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

  Description:           Dials telephone number according to any
                         modifiers included in the string

  Note:                  Any combination of modifiers can be used to
                         produce the desired dial functions in sequence.

        Modifier                             Function

           L             Re-dial last number

           P             Pulse dialing enabled

           R             Answer mode enabled, originate mode disabled
                         following handshake initiation

          S=n            Dial stored telephone number n

           T             Tone dialing enabled

           W             Dialing resumed following dial tone detection

           ,             Dialing paused for amount of time specified in
                         S8 register

           !             Modem commanded to go off-hook for specified
                         time before returning on-hook

           @             Wait for quiet answer

           ;             Modem returned to command state after dialing

                            REPORT INFORMATION

  Type:             Immediate

  Format:           AT [cmds] In [cmds]

  Description:      Displays information requested

     Command                              Function

        I0          Reports product code, e.i. 24x, the x represents the
                    revision level

        I1          Reports ROM checksum

        I2          Reports OK

        I3          Reports product number

