
UNIDENTIFIED

2400U/BU 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
Error Correction/Compression MNP5, V.42

[Image]

                                CONNECTIONS

         Function            Label            Function             Label

  Line in                         CN1       Line out                CN2

            SERIAL PORT ADDRESS

    Setting        SW1/1          SW1/2

  COM1 (3F8h)        On            On

  COM2 (2F8h)       Off            On

  COM3 (3E8h)        On            Off

  COM4 (2E8h)       Off            Off

           INTERRUPT

  Setting    SW2/1      SW2/2

     2        Off        Off

     3         On        Off

     4        Off        On

     5        Off        Off

                         Proprietary AT Command Set

                     AUTO-RELIABLE FALLBACK CHARACTER

  Type:                  Configuration

  Format:                AT [cmds] %An [cmds]

  Default:               0

  Range:                 0-127

  Unit:                  ASCII

  Description:           Sets the character used as the auto-reliable
                         fallback character; %A0 will disable this
                         function.

                  AUTO-RELIABLE TIME BUFFER CONFIGURATION

  Type:                  Configuration

  Format:                AT [cmds] \Cn [cmds]

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

        Command                              Function

          \C0            Data is discarded

          \C1            Data is buffered

          \C2            Data is discarded; modem returns to normal mode
                         on receiving auto-reliable fallback character.

                          BIT-MAPPED REGISTER S14

  Format              AT [cmds] S14=n [cmds]

  Default:            42

  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 jack type, 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 allowed

                   1    Remote digital loopback denied

   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

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Default:       3

  Range:         1-9

  Unit:          .1 second

  Description:   Sends break to modem

                                BREAK TYPE

  Type:                     Configuration

  Format:                   AT [cmds] \Kn [cmds]

  Description:              Configures action of break signal

    Command        Break from DTE      Modem receives     Break from DTE
                                            \B
                   Reliable/Normal                         Direct mode
                        mode

      \K0        Online command       Break sent to     Send break to
                 mode enabled,        remote modem      remote modem
                 send no break to     and buffered      immediately,
                 remote modem         cleared           Online command
                                                        mode enabled

      \K1        Break sent to        Break sent to     Send break to
                 remote modem and     remote modem      remote modem
                 buffered cleared     and buffered      immediately
                                      cleared

      \K2        Online command       Send break to     Send break to
                 mode enabled,        remote modem      remote modem
                 send no break to     immediately       immediately,
                 remote modem                           Online command
                                                        mode enabled

      \K3        Send break to        Send break to     Send break to
                 remote modem         remote modem      remote modem
                 immediately          immediately       immediately

      \K4        Online command       Send break with   Send break to
                 mode enabled,        transmitted       remote modem
                 send no break to     data              immediately,
                 remote modem                           Online command
                                                        mode enabled

      \K5        Send break with      Send break with   Send break to
                 transmitted data     transmitted       remote modem
                                      data              immediately

                             BAUD RATE ADJUST

  Type:          Configuration

  Format:        AT [cmds] \Jn [cmds]

  Description:   Allows baud rate to follow serial port speed

    Command                              Function

      \J0        Baud rate adjust disabled

      \J1        Baud rate adjust enabled

                                COMPRESSION

  Type:          Configuration

  Format:        AT [cmds] %Cn [cmds]

  Description:   Selects data compression

    Command                              Function

      %C0        Data compression disabled

      %C1        Data compression enabled

                          CONFIGURATION PROFILES

  Type:            Immediate

  Format:          AT [cmds] \Sn [cmds]

  Description:     Displays active configuration profiles and stored
                   profile 0 and 1.

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] \Nn [cmds]

  Description:   Controls the type of connection the modem will operate
                 in

    Command                              Function

      \N0        Normal mode enabled

      \N1        Direct mode enabled

      \N2        MNP reliable mode enabled

      \N3        MNP auto-reliable mode enabled

      \N4        LAP-M reliable mode with detection enabled

      \N5        LAP-M auto-reliable mode with detection enabled

      \N6        LAP-M reliable mode without detection enabled

      \N7        LAP-M auto-reliable mode without detection enabled

                          DISPLAY STORED NUMBERS

  Type:          Immediate

  Format:        AT [cmds] \F [cmds]

  Description:   Displays all stored phone numbers

                                 ECHO DATA

  Type:          Configuration

  Format:        AT [cmds] \En [cmds]

  Description:   Enables modem to echo received data

    Command                              Function

      \E0        Data echo disabled

      \E1        Data echo enabled

                           EXTENDED RESULT CODES

  Type:          Configuration

  Format:        AT [cmds] \Vn [cmds]

  Description:   Selects extended result codes

    Command                              Function

      \V0        Extended result codes disabled

      \V1        Extended result codes enabled

                        EXTENDED RESULT CODES - MNP

  Type:                 Configuration

  Format:               AT [cmds] -Mn [cmds]

  Description:          Selects the display of MNP result codes with
                        extended result codes

        Command                             Function

          -M0           Disable display of MNP connection service class

          -M1           Enable display of MNP connection service class
                        while extended result codes are enabled

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] \Qn [cmds]

  Description:   Sets type of flow control used by modem

    Command                              Function

      \Q0        Flow control disabled

      \Q1        XON/XOFF flow control enabled

      \Q2        CTS Unidirectional flow control enabled

      \Q3        Bidirectional CTS/RTS flow control enabled

                             INACTIVITY TIMER

  Type:                  Configuration

  Format:                AT [cmds] \Tn [cmds]

  Default:               0

  Range:                 0-90

  Unit:                  1 minute

  Description:           Sets the length of time that the modem does not
                         receive information before it disconnects.

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:          Configuration

  Format:        AT [cmds] \An [cmds]

  Description:   Sets the maximum transmittable block size

    Command                              Function

      \A0        MNP block size is 64 characters

      \A1        MNP block size is 128 characters

      \A2        MNP block size is 192 characters

      \A3        MNP block size is 256 characters

                              PROTOCOL/SPEED

  Type:          Configuration

  Format:        AT [cmds] %Bn [cmds]

  Description:   Selects the initial DCE speed

    Command                              Function

      %B0        Select 300bps speed

      %B1        Select 1200bps speed

      %B2        Select 2400bps speed

                                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 in progress

                1    Remote digital loopback in progress

    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

                           XON/XOFF PASS-THROUGH

  Type:          Configuration

  Format:        AT [cmds] \Xn [cmds]

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

    Command                              Function

      \X0        XON/XOFF signals trapped by local modem

      \X1        XON/XOFF passed through local modem

