PRACTICAL PERIPHERALS, INC.
===========================

   PM2400SA

   Card Type                Fax, Modem (asynchronous)             
   Chip Set                 Rockwell                              
   Maximum Data Rate        2400bps                               
   Data Bus                 External                              
   Data Modulation Protocol Bell 103/212A                         
                                                                  
                            ITU-T V.22, V.22bis                   

                                                            V2036

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED | Color |  Status  |             Condition             |
   |-----+-------+----------+-----------------------------------|
   | MR  |  Red  |    On    |            Power is on            |
   |-----+-------+----------+-----------------------------------|
   | MR  |  Red  |   Off    |           Power is off            |
   |-----+-------+----------+-----------------------------------|
   | TX  |  Red  |    On    |    Modem is transmitting data     |
   |-----+-------+----------+-----------------------------------|
   | TX  |  Red  |   Off    |  Modem is not transmitting data   |
   |-----+-------+----------+-----------------------------------|
   | RX  |  Red  |    On    |      Modem is receiving data      |
   |-----+-------+----------+-----------------------------------|
   | RX  |  Red  |   Off    |    Modem is not receiving data    |
   |-----+-------+----------+-----------------------------------|
   | CD  |  Red  |    On    |      Carrier signal detected      |
   |-----+-------+----------+-----------------------------------|
   | CD  |  Red  |   Off    |    Carrier signal not detected    |
   |-----+-------+----------+-----------------------------------|
   | OH  |  Red  |    On    |         Modem is off-hook         |
   |-----+-------+----------+-----------------------------------|
   | OH  |  Red  |   Off    |         Modem is on-hook          |
   |-----+-------+----------+-----------------------------------|
   | AA  |  Red  |    On    |        Auto-answer enabled        |
   |-----+-------+----------+-----------------------------------|
   | AA  |  Red  |   Off    |       Auto-answer disabled        |
   |-----+-------+----------+-----------------------------------|
   | AA  |  Red  | Blinking |         Phone is ringing          |
   |-----+-------+----------+-----------------------------------|
   | HS  |  Red  |    On    | Modem is operating at 4800bps or  |
   |     |       |          |              faster               |
   |-----+-------+----------+-----------------------------------|
   | HS  |  Red  |   Off    | Modem is operating at slower than |
   |     |       |          |              4800bps              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               MISCELLANEOUS TECHNICAL NOTES                |
   |------------------------------------------------------------|
   |      Note: Diagram not available. This modem is            |
   |      asynchronous only, but if your software supports      |
   |      synchronous operation the modem will run synchronous  |
   |      mode.                                                 |
   +------------------------------------------------------------+

                     Proprietary AT Command Set

          See document V2037 for complete command summary.

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S21                   |
   |------------------------------------------------------------|
   | Format       | AT [cmds] S21=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | Unidentified                                |
   |--------------+---------------------------------------------|
   | Range:       | 0-253                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Selects jack type, CTS*/DCD/DSR* signals,   |
   |              | low DTR action, and the long space          |
   |              | disconnect function.                        |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   |  0   |   i 0 | Selects RJ-11, RJ-41S, or RJ45S jack        |
   |      |       |                                             |
   |      |     1 | Selects RJ-12 or RJ-13 jack                 |
   |------+-------+---------------------------------------------|
   |  1   |   i 0 | Not used                                    |
   |------+-------+---------------------------------------------|
   |  2   |     0 | *Software driven                            |
   |      |       |                                             |
   |      |     1 | *Software driven                            |
   |------+-------+---------------------------------------------|
   | 4, 3 |  i 00 | DTR signal ignored                          |
   |      |       |                                             |
   |      |    01 | Modem goes to command mode on low DTR       |
   |      |       |                                             |
   |      |    10 | Modem disconnects on low DTR; Auto-Answer   |
   |      |       | is disabled                                 |
   |      |    11 |                                             |
   |      |       | Modem is initialized on low DTR             |
   |------+-------+---------------------------------------------|
   |  5   |   i 0 | DCD forced high                             |
   |      |       |                                             |
   |      |     1 | DCD normal                                  |
   |------+-------+---------------------------------------------|
   |  6   |     0 | *Software driven                            |
   |      |       |                                             |
   |      |     1 | *Software driven                            |
   |------+-------+---------------------------------------------|
   |  7   |   i 0 | Long space disconnect function disabled     |
   |      |       |                                             |
   |      |     1 | Long space disconnect function enabled      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S23                   |
   |------------------------------------------------------------|
   | Format       | AT [cmds] S23=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | Unidentified                                |
   |--------------+---------------------------------------------|
   | Range:       | 0-247                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Grants/denies remote digital loopback*,     |
   |              | controls DTE rate and parity, and sets      |
   |              | guard tone                                  |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   |  0   |     0 | *Software driven                            |
   |      |       |                                             |
   |      |     1 | *Software driven                            |
   |------+-------+---------------------------------------------|
   | 2, 1 |    00 | Sets serial port speed to 0-300bps          |
   |      |       |                                             |
   |      |    01 | Not used                                    |
   |      |       |                                             |
   |      |    10 | Sets serial port speed to 1200bps           |
   |      |       |                                             |
   |      |  i 11 | Sets serial port speed to 2400bps           |
   |------+-------+---------------------------------------------|
   |  3   |   i 0 | Not used                                    |
   |------+-------+---------------------------------------------|
   | 5, 4 |  i 00 | Parity even                                 |
   |      |       |                                             |
   |      |    01 | Space parity                                |
   |      |       |                                             |
   |      |    10 | Parity odd                                  |
   |      |       |                                             |
   |      |    11 | Mark or no parity                           |
   |------+-------+---------------------------------------------|
   | 7, 6 |  i 00 | Guard tone disabled                         |
   |      |       |                                             |
   |      |    01 | Guard tone 550Hz enabled                    |
   |      |       |                                             |
   |      |    10 | Guard tone 1800Hz enabled                   |
   |      |       |                                             |
   |      |    11 | Not used                                    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S27                   |
   |------------------------------------------------------------|
   | Format       | AT [cmds] S27=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | Unidentified                                |
   |--------------+---------------------------------------------|
   | Range:       | 0-115                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Selects synchronous*/asynchronous mode,     |
   |              | clock source*, and ITU-T/Bell modes.        |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   | 1, 0 |  i 00 | Asynchronous mode                           |
   |      |       |                                             |
   |      |    01 | *Software driven                            |
   |      |       |                                             |
   |      |    10 | *Software driven                            |
   |      |       |                                             |
   |      |    11 | *Software driven                            |
   |------+-------+---------------------------------------------|
   | 3, 2 |  i 00 | Not used                                    |
   |------+-------+---------------------------------------------|
   | 5, 4 |    00 | *Software driven                            |
   |      |       |                                             |
   |      |    01 | *Software driven                            |
   |      |       |                                             |
   |      |    10 | *Software driven                            |
   |      |       |                                             |
   |      |    11 | *Software driven                            |
   |------+-------+---------------------------------------------|
   |  6   |     0 | ITU/T mode                                  |
   |      |       |                                             |
   |      |   i 1 | Bell mode                                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  SOFTWARE DRIVEN COMMANDS                  |
   |------------------------------------------------------------|
   | Type:     | Configuration                                  |
   |-----------+------------------------------------------------|
   | Note:     | These commands are used by software that       |
   |           | allows the modem to operate in synchronous     |
   |           | mode, this modem doesn't have the hardware to  |
   |           | support synchronous mode.                      |
   |------------------------------------------------------------|
   |     Command     |                 Function                 |
   |-----------------+------------------------------------------|
   |  Unidentified   | Smart/Dumb mode options                  |
   |-----------------+------------------------------------------|
   |       &S        | Ready To Send/Clear To Send options      |
   |-----------------+------------------------------------------|
   |       &R        | Data Set Ready options                   |
   |-----------------+------------------------------------------|
   |       &X        | DTE transmit clock source                |