
ACER, INC.

28.8 EXTERNAL MODEM

Card Type                    Modem(synchronous/asynchronous), Fax
Chip Set                     Unidentified
Maximum Data Rate            28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     External
Fax Class                    Class I & II
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.22, V.22bis, V.32, V.32bis,
                             V.32terbo, V.34
Fax Modulation Protocol      ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression MNP2-5, V.42, V.42bis

[Image]

                                CONNECTIONS

        Function           Label             Function              Label

  Line in                       CN1      RS-232/422                 CN3

  Line out                      CN2      DC power                   CN4

                             DIAGNOSTIC LED(S)

   LED      Status                        Condition

    MR       On                          Power is on

    MR       Off                         Power is off

    TR       On                       DTR signal is high

    TR       Off                      DTR signal is low

    SD       On                    Modem transmitting data

    SD       Off                 Modem not transmitting data

    RD       On                      Modem receiving data

    RD       Off                   Modem not receiving data

    OH       On                       Modem is off-hook

    OH       Off                       Modem is on-hook

    CD       On                    Carrier signal detected

    CD       Off                 Carrier signal not detected

    AA       On                      Auto-answer enabled

    AA       Off                     Auto-answer disabled

    EC       On                  Error correction in progress

    EC       Off                  Error correction inactive

                         Proprietary AT Command Set

                          AUTO ANSWER RING COUNT

  Type:                    Register

  Format:                  AT [cmds] S0=n [cmds]

  Unit:                    1 ring

  Description:             Sets the number of rings allowed before the
                           modem automatically goes off-hook

  Note:                    If S0=0, automatic-answering is disabled. The
                           A command must be used to go off-hook.

         Country                  Default                   Range

         Standard                    0                      0-255

          France                     0                      0,2-3

         Germany                     0                       0-5

       Switzerland                   0                      0,2-9

          Italy                      0                       0,2

                     Auto-reliable fallback character

  Type:          Register

  Format         AT [cmds] S29=n [cmds]

  Default:       0

  Range:         Unidentified

  Unit:          Unidentified

  Description:   The character used for fallback in auto-reliable mode

                          Baud rate set selection

  Type:          Configuration

  Format:        AT [cmds] %Nn [cmds]

  Description:   Sets the type of baud rates the modem uses

  Note:          This command only functions in the external version

    Command                              Function

      %N0         Sets modem to IBM PC DTE baud rates

      %N1         Sets modem to NEC PC98 DTE baud rate set 1

      %N2         Sets modem to NEC PC98 DTE baud rate set 2

  BIT MAPPED REGISTERS

  Register     Default

    S14          137

    S15          83

    S17          75

    S19           3

    S20           0

    S21          48

    S22          246

    S23          12

    S24          72

    S27           0

    S28          16

                            BLIND DIALING DELAY

  Type:                     Register

  Format                    AT [cmds] S6=n [cmds]

  Unit:                     1 second

  Description:              Duration of delay after modem goes off-hook
                            and before dialing blindly during modes set
                            by X0, X1 or X3 commands.

          Country                   Default                 Range

         Standard                      2                    2-255

      United Kingdom                   4                     4-7

        Switzerland                    2                     5-15

                        CARRIER LOSS RESPONSE TIME

  Type:                     Register

  Format                    AT [cmds] S10=n [cmds]

  Unit:                     .1 second

  Description:              Maximum time allowed by the modem after
                            losing the carrier signal and prior to
                            initiating hang-up process.

          Country                   Default                 Range

         Standard                     14                    1-255

          Germany                     14                    2-204

                            COMMUNICATIONS MODE

  Type:                  Configuration

  Format:                AT [cmds] &Qn [cmds]

  Description:           Selects communications mode options

        Command                                Mode

          &Q0            Asynchronous mode, serial port speed follows
                         connect speed.

          &Q1            Asynchronous off-line command mode and
                         synchronous connect mode.

          &Q2            If an off to on DTR transition occurs, modem
                         automatically dials first number in directory,
                         then activates synchronous connect mode.

          &Q3            Synchronous connect mode on high DTR.

                          COMMUNICATION PROTOCOLS

  Type:                  Configuration

  Format:                AT [cmds] Bn [cmds]

  Description:           Selects the communication protocol for data
                         calls

  Note:                  The B command allows the simultaneous selection
                         of more than one suffix, enabling multiple
                         protocols.

        Command                              Protocol

          B0             ITU-T V.22 at 1200bps or V.21 at 300

          B1             Bell 212A at 1200bps or Bell 103 at 300

          B2             In V.23 originate mode receive at 1200bps
                         transmit at 75bps; in answer mode receive at
                         75bps transmit at 1200bps

                                   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.

        Command                              Function

          DP             Pulse dialing enabled

          DR             Answer mode enabled; originate mode disabled
                         following handshake initiation.

         DS=n            Dial stored telephone number n (n= 0 to 3)

          DT             Tone dialing enabled/Pulse dialing disabled

          DW             Dialing resumed following dial tone detection

          D,             Dialing paused for amount of time specified in
                         S8 register

        D"WXY"           Optional method of denoting telephone numbers.
                         Letters enclosed in quotes are interpreted as
                         numbers according to the system found on a
                         telephone keypad.

          D!             Flash function initiated. Modem commanded to go
                         off-hook for specified time before returning
                         on-hook.

          D@             Wait for Quiet Answer function enabled. Modem
                         waits until a "quiet answer," a ring-back signal
                         followed by silence up to the time specified in
                         S7, is received prior to executing the rest of
                         the dial string.

          D;             Modem returned to idle state after dialing. The
                         semicolon can only be placed at the end of the
                         dial command.

          D^             Enables calling tone for data modem

                                 dumb mode

  Type:                  Configuration

  Format:                AT [cmds] %Dn [cmds]

  Description:           Puts the modem into dumb mode

  Note:                  Used in situations where the modems
                         microprocessor is not required, such as
                         connection to a mainframe, leased line, or in
                         synchronous mode

        Command                              Function

          %D0            Dumb mode disabled

          %D1            Dumb mode 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.

                             INACTIVITY TIMER

  Type:                  Register

  Format                 AT [cmds] S30=n [cmds]

  Default:               0

  Range:                 0-90

  Unit:                  1 second

  Description:           Maximum duration of DTE and DCE inactivity
                         allowed prior to initiating hang-up process.

  Note:                            S30=0 disables the timer and allows
                                   indefinite inactivity.

                          Modem connection speed

  Type:          Configuration

  Format:        AT [cmds] %Bn [cmds]

  Description:   Sets the maximum connection speed

    Command                              Function

     %B300        300bps

     %B1200       1200bps

     %B2400       2400bps

     %B4800       4800bps

     %B7200       7200bps

     %B9600       9600bps

    %B12000       12.0Kbps

    %B14400       14.4Kbps

    %B16800       16.8Kbps

    %B19200       19.2Kbps

    %B21600       21.6Kbps

    %B24000       24.0Kbps

    %B26400       26.4Kbps

    %B28800       28.8Kbps

                            NO CARRIER TIME-OUT

  Type:                     Register

  Format                    AT [cmds] S7=n [cmds]

  Unit:                     1 second

  Description:              Maximum time the modem waits after dialing to
                            detect a carrier signal from the remote modem
                            for both originating and answering calls.

  Note:                     W dial modifier also uses S7 to set the
                            maximum time to wait.

          Country                   Default                 Range

         Standard                     45                    1-255

          France                      45                    30-85

          Germany                     45                     5-80

        Switzerland                   45                     5-55

           Italy                      50                    45-50

                            PULSE DIALING RATIO

  Type:          Configuration

  Format:        AT [cmds] &Pn [cmds]

  Description:   Selects pulse dial make/break ratio

    Command                              Function

      &P0        33/67ms at 10pps (Europe)

      &P1        39/61ms at 10pps

      &P2        33/67ms at 20pps

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Description:   Displays information requested

    Command                              Function

       I0        Reports modem product code

       I1        Reports ROM checksum

       I2        Tests and reports ROM checksum

       I3        Reports model and firmware identification

       I5        Reports country code

                             RTS TO CTS DELAY

  Type:            Register

  Format           AT [cmds] S26=n [cmds]

  Default:         1

  Range:           0 - 255

  Unit:            .01 second

  Description:     Sets the duration of delay for CTS to respond to RTS
                   status change

  Note:            This is only used when &R0 is set.

                            TONE PULSE DURATION

  Type:                     Register

  Format                    AT [cmds] S11=n [cmds]

  Default:                  95

  Range:                    50-255

  Unit:                     1 ms

  Description:              DTMF tone pulse duration and time between
                            tone pulses for tone dialing operations.

          Country                  Default                  Range

         Standard                    95                    50-255

          France                     85                     70-90

          Germany                    85                     85-95

        Switzerland                  85                     70-90

           Italy                     85                    65-150

           Spain                     135                   135-255

                         TRANSMISSION LEVEL - PSTN

  Type                      Register or Configuration

  Format                    AT [cmds] S91=n [cmds]

  Unit                      -1 dBm

  Description               Sets the signal level for transmission over
                            switched phone lines

         Country                   Default                  Range

         Standard                    12                     0-15

          Sweden                     14                     0-15

