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       # U.S. ROBOTICS, INC.
       
          SPORTSTER 1200
       
          Modem Type               Data (synchronous/asynchronous)       
          Maximum Data Rate        1200bps                               
          Data Bus                 External                              
          Data Modulation Protocol Bell 103A/212A                        
       
   IMG IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |      Purpose       | Location |     Purpose     | Location |
          |--------------------+----------+-----------------+----------|
          | Line out           |   CN1    | Power           |   CN4    |
          |--------------------+----------+-----------------+----------|
          | Line in            |   CN2    | Volume          |   SW3    |
          |--------------------+----------+-----------------+----------|
          | RS-232/422         |   CN3    | Power           |   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           |
          |--------------------------------+---------------------------|
          | » Verbose result codes enabled |            On             |
          |--------------------------------+---------------------------|
          | Numeric result codes enabled   |            Off            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    RESULT CODES DISPLAY                    |
          |------------------------------------------------------------|
          | Setting                       |           SW1/3            |
          |-------------------------------+----------------------------|
          | » Display enabled             |             On             |
          |-------------------------------+----------------------------|
          | Display disabled              |            Off             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   ECHO COMMANDS DISPLAY                    |
          |------------------------------------------------------------|
          | Setting                       |           SW1/4            |
          |-------------------------------+----------------------------|
          | » Local echo enabled          |            Off             |
          |-------------------------------+----------------------------|
          | Local echo disabled           |             On             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        AUTO ANSWER                         |
          |------------------------------------------------------------|
          | Setting                              |        SW1/5        |
          |--------------------------------------+---------------------|
          | » Modem doe not answer on first ring |         On          |
          |--------------------------------------+---------------------|
          | Modem answers on first ring          |         Off         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       CARRIER DETECT                       |
          |------------------------------------------------------------|
          | Setting                       |           SW1/6            |
          |-------------------------------+----------------------------|
          | » CD normal                   |            Off             |
          |-------------------------------+----------------------------|
          | CD forced high                |             On             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   MULT-LINE 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             |
          +------------------------------------------------------------+
       
                            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.                            |
          +------------------------------------------------------------+