
3COM CORPORATION

DIRECT 2400

Card Type                Modem (asynchronous)
Chip Set                 U.S.Robotics
Maximum Data Rate        2400bps
Data Bus                 External
Data Modulation Protocol Unidentified

[Image]

                                CONNECTIONS

        Function           Label             Function              Label

  Line out/in -                CN1      DC power - Unidentified     CN4
  Unidentified

  Line in/out -                CN2      Power switch -              SW1
  Unidentified                          Unidentified

  RS-232/422 - Unidentified    CN3

                        USER CONFIGURABLE SETTINGS

                      Setting                         Label      Position

  DTR normal                                          SW1/1        On

  DTR Forced high                                     SW1/1        Off

  Verbose result codes                                SW1/2        Off

  Numeric result codes                                SW1/2        On

  Result codes enabled                                SW1/3        On

  Result codes disabled                               SW1/3        Off

  Commands displayed                                  SW1/4        Off

  Commands not displayed                              SW1/4        On

  Auto-answer mode enabled                            SW1/5        Off

  Auto-answer mode disabled                           SW1/5        On

  CD signal forced high                               SW1/6        On

  CD signal normal                                    SW1/6        Off

  RJ-11 jack                                          SW1/7        Off

  RJ-12, RJ-13 jack                                   SW1/7        On

  Smart mode                                          SW1/8        On

  Dumb mode                                           SW1/8        Off

                             DIAGNOSTIC LED(S)

    LED       Color      Status                   Condition

   Left       Green        On               Modem is in data mode

   Left       Green        Off             Modem is not data mode

   Left        Red         On       Modem is in analog loopback test mode

   Left        Red       Blinking      Power on/self-test in progress

   Right      Green        On       Carrier signal detected/ready to send
                                                    data

   Right      Green        Off      Carrier signal not detected/not ready
                                                to send data

   Right       Red         Off         Modem is not receiving data/not
                                           displaying result codes

   Right       Red       Blinking      Modem is receiving data/display
                                                result codes

                         Proprietary AT Command Set

                                   ABORT

  Type:          Immediate

  Format:        Any key

  Description:   Aborts answering/originating a call; modem hangs up.

                                  ANSWER

  Type:                Immediate

  Format:              AT [cmds] A

  Description:         Enables manual answer mode, the modem goes
                       off-hook; pressing any key will abort.

                              ANSWER SEQUENCE

  Type:          Configuration

  Format:        AT [cmds] Bn [cmds]

  Description:   Selects the answer sequence the modem will use

    Command                              Function

       B0        ITU-T answer sequence enabled

       B1        Bell answer sequence enabled

                                 ATTENTION

  Type:              Immediate

  Format:            AT [cmds]

  Description:       Tells the modem that a command follows or use alone
                     to test OK result code

                                   CLOCK

  Type:               Configuration

  Format:             AT [cmds] Kn [cmds]

  Description:        Displays connection duration or real time

       Command                              Function

         K0            Connection duration displayed in ATI3

         K1            Real time displayed in ATI3. To set clock
                       (military time) use ATI3=HH:MM:SSK1.

                                   DIAL

  Type:                 Immediate

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

  Example:              ATDT 443-3388,,,1111;

  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

           P            Pulse dialing enabled

           T            Tone dialing enabled

           ,            Dialing paused for 2 seconds

           ;            Modem returned to command state after dialing.
                        Can only be placed at the end of the dial
                        command.

           "            Dials letters as if they were numbers;
                        ATDT"GOMICRO"

           !            Flash function initiated

           @            Dial, wait for quiet answer, then continue to
                        execute the rest of the dial string

           W            Dial, wait for second dial tone, then continue to
                        execute the rest of the dial string

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

                                   ECHO

  Type:            Configuration

  Format:          AT [cmds] En [cmds]

  Description:     Controls echo function; display keyboard commands when
                   enabled.

     Command                             Function

       E0          Echo function disabled

       E1          Echo function enabled

                              ECHO - ON-LINE

  Type:          Configuration

  Format:        AT [cmds] Fn [cmds]

  Description:   Selects whether data sent while in data mode are echoed

    Command                              Function

       F0        Local echo enabled

       F1        Local echo disabled

                              ESCAPE SEQUENCE

  Type:                   Immediate

  Format:                 +++AT [cmds] <CR>

  Description:            Initiates the escape sequence and returns the
                          modem to the on-line command state if it
                          receives three escape characters set in S2
                          within the time allotted by S12.

            Note: Do not precede this command with AT.

                                GUARD TONE

  Type:          Configuration

  Format:        AT [cmds] &Gn [cmds]

  Description:   Commands the modem to transmit a guard tone

            Note: Used primarily for international data transmission

    Command                              Function

      &G0        Guard tone disabled

      &G1        550Hz guard tone enabled

      &G2        1800Hz guard tone enabled

                          HELP SCREEN - CONTROLS

  Type:          Immediate

  Format:        <Ctrl> C, K or S

  Description:   Cancel; or stop/restart scrolling of help screens

    Command                              Function

    <Ctrl> C      Cancel display of help screen

    <Ctrl> K      Cancel display of help screen

    <Ctrl> S      Stop/restart scrolling of help screens

                               HOOK CONTROL

  Type:          Immediate

  Format:        AT [cmds] Hn [cmds]

  Description:   Selects whether the modem is on-hook or off-hook

    Command                              Function

       H0        Modem commanded to go on-hook (hang-up)

       H1        Modem commanded to go off-hook (pick-up)

                            LIST DIAL COMMANDS

  Type:          Immediate

  Format:        AT [cmds] D$ [cmds]

  Description:   Displays dial commands

                             LIST S-REGISTERS

  Type:          Immediate

  Format:        AT [cmds] S$ [cmds]

  Description:   Displays the S-registers

                                  ON-LINE

  Type:           Immediate

  Format:         AT [cmds] O [cmds]

  Description:    Returns to on-line command (data transmission) mode.

            Note: The O command must be placed at the end of the command
            string.

                               ON-LINE HELP

  Type:          Immediate

  Format:        AT [cmds] $ [cmds]

  Description:   On-line help; displays basic command list.

                               PRODUCT CODE

  Type:          Register

  Format:        AT [cmds] S14 [cmds]

  Description:   Stores product code, displayed in ATI0.

                               PULSE DIALING

  Type:              Configuration

  Format:            AT [cmds] P [cmds]

  Description:       Enables pulse dialing

            Note: This command can be duplicated with the P modifier in
            the D (Dial) command.

                            PULSE DIALING RATIO

  Type:          Configuration

  Format:        AT [cmds] &Pn [cmds]

  Description:   Selects pulse dial make/break ratio

    Command                              Function

      &P0        39/61ms at 10pps (North America)

      &P1        33/67ms at 10pps (Europe)

                               RECEIVE-ONLY

  Type:                Configuration

  Format:              AT [cmds] Cn [cmds]

  Description:         Sets receive-only; used if modem is attached to
                       additional monitoring-only systems

       Command                              Function

          C0            Disables transmitter

          C1            Enables transmitter

                           REPEAT COMMAND STRING

  Type:                  Configuration

  Format:                AT [cmds] > [cmds]

  Example:               AT>DT5551212 or ATDT5551212>

  Description:           Causes modem to repeat command string until a
                         keyboard key is pressed

            Note: If used before or after the ATD command, the modem will
            redial the number until a connection is established or a
            maximum of ten attempts is reached.

                          REPEAT PREVIOUS COMMAND

  Type:           Immediate

  Format:         A/

  Description:    Repeats previous command; mainly used for redial.

            Note: Do not precede this command with AT, or follow it with
            <CR>.

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Description:   Displays information requested

    Command                              Function

       I0        Reports product code

       I1        Reports ROM checksum

       I2        Reports RAM test (OK or ERROR, followed by OK)

       I3        Reports connection duration and real time

       I4        Reports current command settings

                               RESULT CODES

  Type:          Configuration

  Format:        AT [cmds] Qn [cmds]

  Description:   Enables modem to send result codes to the DTE

    Command                              Function

       Q0        Result code sending enabled

       Q1        Result code sending disabled

                            RESULT CODE FORMAT

  Type:             Configuration

  Format:           AT [cmds] Vn [cmds]

  Description:      Selects word or numeric format for information-text
                    and result codes

     Command                              Function

        V0          Numeric format enabled

        V1          Verbose (word) format enabled

                     SELECT CALL PROGRESS RESULT CODES

  Type:                  Configuration

  Format:                AT [cmds] Xn [cmds]

  Description:           Enables selection of tone detection and
                         associated result code format options

        Command                              Function

           X0            Busy and dial tone detection disabled; result
                         codes 0-5 and 10 enabled.

           X1            Busy and dial tone detection disabled; result
                         codes 0-5 and 10 enabled

           X2            Busy tone detection disabled, dial tone
                         detection enabled; result codes 0-6 and 10
                         enabled; also adaptive dialing, and fast dialing
                         enabled.

           X3            Busy tone detection enabled, dial tone detection
                         disabled; result codes 0-5, 7-10 enabled; also
                         adaptive dialing, wait for second dial tone, and
                         wait for answer enabled.

           X4            Busy and dial tone detection enabled; result
                         codes 0-10 enabled; also adaptive dialing, wait
                         for second dial tone, wait for answer, and fast
                         dialing enabled.

           X5            Busy tone detection enabled, dial tone detection
                         disabled; result codes 0-5, 7-12 enabled; also
                         adaptive dialing, wait for second dial tone, and
                         wait for answer enabled.

           X6            Busy and dial tone detection enabled; result
                         codes 0-12 enabled; also adaptive dialing, wait
                         for second dial tone, wait for answer, and fast
                         dialing enabled.

  Note: Valid numeric result codes; 0-8, and 10-12.

                                SOFT RESET

  Type:          Immediate

  Format:        AT [cmds] Zn [cmds]

  Description:   Restores modem software default profile

                               SPEAKER MODE

  Type:                Configuration

  Format:              AT [cmds] Mn [cmds]

  Description:         Selects various speaker options

       Command                             Function

         M0            Speaker disabled

         M1            Speaker enabled until carrier signal detected

         M2            Speaker enabled

         M3            Speaker enabled following dialing, then disabled
                       after carrier signal detected.

                              STATUS-REGISTER

  Type:          Configuration

  Format:        Read: AT [cmds] Sn? [cmds]

                 Write: AT [cmds] Sn=x [cmds]

  Description:   Writes to or reads from a specified register

                                TEST MODES

  Type:                Configuration

  Format:              AT [cmds] S16=n [cmds]

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

       Command                              Function

        S16=0          Testing disabled

        S16=1          Local analog loopback enabled

        S16=2          Dial test (Factory testing only)

        S16=4          Test pattern enabled (transmitted on CONNECT,
                       either on answering or originate)

        S16=5          Local analog loopback and test pattern enabled

                               TONE DIALING

  Type:              Configuration

  Format:            AT [cmds] T [cmds]

  Description:       Enables tone dialing mode

            Note: This command can be duplicated with the T modifier in
            the D (Dial) command.

