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       # 3COM CORPORATION
       
          US ROBOTICS 2400
       
          Modem Type               Data (synchronous/asynchronous)       
          Maximum Data Rate        2400bps                               
          Data Bus                 External                              
          Fax Class                Class I & II                          
          Data Modulation Protocol Bell 103A/212A                        
                                                                         
                                   ITU-T V.22bis                         
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |     Purpose      | Location |      Purpose      | Location |
          |------------------+----------+-------------------+----------|
          | Line out         |   CN1    | Power in          |   CN4    |
          |------------------+----------+-------------------+----------|
          | Line in          |   CN2    | Volume            |    R1    |
          |------------------+----------+-------------------+----------|
          | RS-232/422       |   CN3    | Power switch      |   SW2    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          | LED  | Color |  Status  |            Condition             |
          |------+-------+----------+----------------------------------|
          | LED1 |  Red  |    On    |  Analog loopback self test mode  |
          |------+-------+----------+----------------------------------|
          | LED1 | Green |    On    |            Data mode             |
          |------+-------+----------+----------------------------------|
          | LED2 |  Red  | Blinking | Modem is transmitting/receiving  |
          |      |       |          |               data               |
          |------+-------+----------+----------------------------------|
          | LED2 | Green |    On    |     Carrier signal detected      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         DTR SIGNAL                         |
          |------------------------------------------------------------|
          | Setting                    |             SW1/1             |
          |----------------------------+-------------------------------|
          | » On                       |        DTR forced high        |
          |----------------------------+-------------------------------|
          | Off                        |          DTR normal           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        RESULT CODES                        |
          |------------------------------------------------------------|
          | Setting                   |             SW1/2              |
          |---------------------------+--------------------------------|
          | » Off                     | Extended result codes enabled  |
          |---------------------------+--------------------------------|
          | On                        | Extended result codes disabled |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    RESULT CODES DISPLAY                    |
          |------------------------------------------------------------|
          | Setting                    |             SW1/3             |
          |----------------------------+-------------------------------|
          | » On                       |       Display disabled        |
          |----------------------------+-------------------------------|
          | Off                        |        Display enabled        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        ECHO DISPLAY                        |
          |------------------------------------------------------------|
          | Setting                    |             SW1/4             |
          |----------------------------+-------------------------------|
          | » Off                      |      Local echo enabled       |
          |----------------------------+-------------------------------|
          | On                         |      Local echo disabled      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        AUTO ANSWER                         |
          |------------------------------------------------------------|
          | Setting               |               SW1/5                |
          |-----------------------+------------------------------------|
          | » On                  | Modem doe not answer on first ring |
          |-----------------------+------------------------------------|
          | Off                   |    Modem answers on first ring     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       CARRIER DETECT                       |
          |------------------------------------------------------------|
          | Setting                    |             SW1/6             |
          |----------------------------+-------------------------------|
          | » Off                      |           CD normal           |
          |----------------------------+-------------------------------|
          | On                         |        CD forced high         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                MULTIPLE PHONE INSTALLATION                 |
          |------------------------------------------------------------|
          | Setting                    |             SW1/7             |
          |----------------------------+-------------------------------|
          | » Off                      |    Single phone connected     |
          |----------------------------+-------------------------------|
          | On                         |   Multiple phones connected   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       AT COMMAND SET                       |
          |------------------------------------------------------------|
          | Setting                    |             SW1/8             |
          |----------------------------+-------------------------------|
          | » On                       |   AT command set recognized   |
          |----------------------------+-------------------------------|
          | Off                        |    AT command set disabled    |
          +------------------------------------------------------------+
       
                            Proprietary AT Command Set
       
          +------------------------------------------------------------+
          |                        TIME DISPLAY                        |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Kn [cmds]                         |
          |--------------+---------------------------------------------|
          | Example:     | AT K1 *L2 #E1<CR>                           |
          |--------------+---------------------------------------------|
          | Description: | Displays the current call time or clock     |
          |              | time.                                       |
          |--------------+---------------------------------------------|
          |   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] >                                 |
          |--------------+---------------------------------------------|
          | Example:     | AT DT1(303) 443-3388 > <CR>                 |
          |--------------+---------------------------------------------|
          | Description: | Causes modem to repeat command string until |
          |              | a keyboard key is pressed.                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 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.           |
          +------------------------------------------------------------+