3COM CORPORATION

US ROBOTICS 2400PC

Modem Type             Data (synchronous/asynchronous)
Maximum Data Rate      2400bps
Data Bus               8-bit ISA
Fax Class              Class I & II
Data Modulation        Bell 103A/212A
Protocol
                       ITU-T V.21, V.22

[Image]

                                CONNECTIONS

         Purpose           Location            Purpose           Location

  Line out                    CN1       Volume                     SW2

  Line in                     CN2

                DTR SIGNAL

  Setting                   SW1/1

  » DTR forced high           On

  DTR normal                 Off

                           RESULT CODES

  Setting                                     SW1/2

  » Verbal result codes enabled                Off

  Numeric result codes enabled                  On

            RESULT CODES DISPLAY

  Setting                     SW1/3

  » Display disabled           On

  Display enabled              Off

                  ECHO DISPLAY

  Setting                        SW1/4

  » Local echo enabled            Off

  Local echo disabled             On

                                AUTO ANSWER

  Setting                                             SW1/5

  » Modem does not answer on first                     On
  ring

  Modem answers on first ring                          Off

           CARRIER DETECT

  Setting               SW1/6

  » CD normal            Off

  CD forced high         On

               MULTIPLE PHONE INSTALLATION

  Setting                               SW1/7

  » Single phone connected               Off

  Multiple phones connected               On

                        AT COMMAND SET

  Setting                                  SW1/8

  » AT command set recognized                On

  AT command set disabled                   Off

                                ESCAPE CODE

  Setting                                           SW1/9

  » On                                 Go to command mode and display OK
                                     result code when escape character is
                                                   received

  Off                                 Disconnect, go to command mode and
                                        display NO CARRIER when escape
                                            character is received

  FACTORY CONFIGURED SETTINGS

     Switch         Setting

     SW1/10         Not used

                    COM PORT CONFIGURATION

        Port                  J1                  J2

    COM1: (3F8h)       Pins 1 & 2 closed   Pins 1 & 2 closed

    COM2: (3E8h)       Pins 3 & 4 closed   Pins 1 & 2 closed

    COM3: (2F8h)       Pins 1 & 2 closed   Pins 3 & 4 closed

    COM4: (2E8h)       Pins 3 & 4 closed   Pins 3 & 4 closed

           INTERRUPT SELECTION

         IRQ                  J3

          3           Pins 3 & 5 closed

          4           Pins 1 & 3 closed

          5           Pins 2 & 4 closed

          7           Pins 4 & 6 closed

      Disabled               Open

                         Proprietary AT Command Set

                         ANALOG LOOPBACK SELF TEST

  Type:          Register

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

  Example:       ATS16=139<CR>

  Description:   Selects the tone dialing test.

  Command                                Function

       0         Data mode.

       1         Analog loopback.

       2         Dial testing.

       4         Test pattern.

       5         Analog loopback and test pattern.

                               CLOCK DISPLAY

  Type:          Configuration

  Format:        AT [cmds] Kn [cmds]

  Example:       AT K1 *L2 #E1<CR>

  Description:   Automatically establishes switched line connection if
                 leased line fails

    Command                              Function

       K0        Display length of last call.

       K1        Display actual time.

                               HELP SCREENS

  Type:                Immediate

  Format:              AT <prefix>$

  Example:             AT &$<CR>

  Description:         Shows command help screens for all commands
                       beginning with the given prefix, or no prefix if
                       none is given.

       Command                              Function

          $            Shows ATx help screen.

         D$            Shows ATDx help screen.

         S$            Shows S-register help screen.

                           REPEAT COMMAND STRING

  Type:          Configuration

  Format:        AT [cmds] > [cmds]

  Example:       AT *D1 > #E1<CR>

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