
UNIDENTIFIED

2400BS MODEM

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.21, V.22, V.22bis

[Image]

                                CONNECTIONS

         Function            Label            Function             Label

  Line in                         CN1       Volume                   R1

  Line out                        CN2

             SERIAL PORT ADDRESS AND INTERRUPT

    Setting       Setting         SW1/1          SW1/2

  COM1 (3F8h)      IRQ 4            On            On

  COM2 (2F8h)      IRQ 3           Off            On

  COM3 (3E8h)      IRQ 4            On            Off

  COM4 (2E8h)      IRQ 3           Off            Off

                         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:              48

  Range:                0-252

  Unit:                 Bit-mapped

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

    Bit       Value                         Function

   1, 0            0    Not used

     2              0   CTS follows RTS

                   1    CTS forced high

   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   DSR forced high

                   1    DSR normal

     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 make/break ratio.

    Bit      Value                          Function

   1, 0           00   Off volume

                  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, 5, 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 enabled
                111
                       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:              6

  Range:                0-183

  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

                   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 Parity

   7, 6            00   Guard tone disabled

                   01   Guard tone 550Hz enabled

                  10    Guard tone 1800Hz enabled

                          BIT-MAPPED REGISTER S27

  Format           AT [cmds] S27=n [cmds]

  Default:         64

  Range:           0-68

  Unit:            Bit-mapped

  Description:     Selects line type, and ITU-T/Bell modes.

   Bit    Value                           Function

  1, 0        0    Not used

    2          0   Switched line

              1    Leased line

  5 - 3       0    Not used

    6          0   ITU/T mode

              1    Bell mode

                                TEST MODES

  Format             AT [cmds] S16=n [cmds]

  Default:           0

  Range:             0-125

  Unit:              Bit-mapped

  Description:       Controls loopback tests, analog, digital, remote
                     digital, and self tests.

   Bit      Value                          Function

    0            0   Local analog loopback not in progress

                1    Local analog loopback in progress

    1           0    Not used

    2            0   Local digital loopback not in progress

                1    Local digital loopback in progress

    3            0   Modem not in remote digital loopback

                1    Remote digital loopback in progress

    4            0   Remote digital loopback not requested

                1    Remote digital loopback requested

    5            0   Remote digital loopback w/ self-test not in progress

                1    Remote digital loopback w/ self-test in progress

    6            0   Local analog loopback w/ self-test not in progress

                1    Local analog loopback w/ self-test in progress

