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

   PM2400

   Card Type                Modem (asynchronous)                  
   Chip Set                 Unidentified                          
   Maximum Data Rate        2400bps                               
   Data Bus                 8-bit ISA                             
   Data Modulation Protocol Bell 103/212A                         
                                                                  
                            ITU-T V.22                            

                                                            V2037

   +------------------------------------------------------------+
   |                    SERIAL PORT ADDRESS                     |
   |------------------------------------------------------------|
   |    Setting    |     IRQ     |     SW1/A     |    SW1/B     |
   |---------------+-------------+---------------+--------------|
   |  COM1 (3F8h)  |      4      |      On       |      On      |
   |---------------+-------------+---------------+--------------|
   |  COM2 (2F8h)  |      3      |      Off      |     Off      |
   |---------------+-------------+---------------+--------------|
   |  COM3 (3E8h)  |      4      |      On       |     Off      |
   |---------------+-------------+---------------+--------------|
   |  COM4 (2E8h)  |      3      |      Off      |      On      |
   +------------------------------------------------------------+

   +-------------------------------+
   | MISCELLANEOUS TECHNICAL NOTES |
   |-------------------------------|
   |      Diagram not available    |
   +-------------------------------+

                     Proprietary AT Command Set

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S14                   |
   |------------------------------------------------------------|
   | Format:      | AT [cmds] S14=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 170                                         |
   |--------------+---------------------------------------------|
   | Range:       | 0-174                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Controls echo, result codes and display,    |
   |              | dial mode, and answer/originate mode.       |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   |  0   |   i 0 | Not used                                    |
   |------+-------+---------------------------------------------|
   |  1   |     0 | Command echo disabled                       |
   |      |       |                                             |
   |      |   i 1 | Command echo enabled                        |
   |------+-------+---------------------------------------------|
   |  2   |   i 0 | Result codes enabled                        |
   |      |       |                                             |
   |      |     1 | Result codes disabled                       |
   |------+-------+---------------------------------------------|
   |  3   |     0 | Display result codes in numeric format      |
   |      |       |                                             |
   |      |   i 1 | Display result codes in verbose format      |
   |------+-------+---------------------------------------------|
   |  4   |   i 0 | Not used                                    |
   |------+-------+---------------------------------------------|
   |  5   |     0 | Tone dial enabled                           |
   |      |       |                                             |
   |      |   i 1 | Pulse dial enabled                          |
   |------+-------+---------------------------------------------|
   |  6   |   i 0 | Not used                                    |
   |------+-------+---------------------------------------------|
   |  7   |     0 | Answer mode enabled                         |
   |      |       |                                             |
   |      |   i 1 | Originate mode enabled                      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S21                   |
   |------------------------------------------------------------|
   | Format       | AT [cmds] S21=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 0                                           |
   |--------------+---------------------------------------------|
   | Range:       | 0-185                                       |
   |--------------+---------------------------------------------|
   | 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                 |
   |------+-------+---------------------------------------------|
   | 2, 1 |  i 00 | Not used                                    |
   |------+-------+---------------------------------------------|
   | 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   |   i 0 | Not used                                    |
   |------+-------+---------------------------------------------|
   |  7   |   i 0 | Long space disconnect function disabled     |
   |      |       |                                             |
   |      |     1 | Long space disconnect function enabled      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S22                   |
   |------------------------------------------------------------|
   | Format       | AT [cmds] S22=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 118                                         |
   |--------------+---------------------------------------------|
   | Range:       | 0-255                                       |
   |--------------+---------------------------------------------|
   | Unit:        | Bit-mapped                                  |
   |--------------+---------------------------------------------|
   | Description: | Controls speaker volume and controls,       |
   |              | limits results codes, and pulse dial        |
   |              | make/break ratio.                           |
   |--------------+---------------------------------------------|
   | Bit  | Value |                  Function                   |
   |------+-------+---------------------------------------------|
   | 1, 0 |    00 | Volume off                                  |
   |      |       |                                             |
   |      |    01 | Low level volume                            |
   |      |       |                                             |
   |      |  i 10 | Medium level volume                         |
   |      |       |                                             |
   |      |    11 | High level volume                           |
   |------+-------+---------------------------------------------|
   | 3, 2 |    00 | Speaker off                                 |
   |      |       |                                             |
   |      |  i 01 | Speaker off on carrier                      |
   |      |       |                                             |
   |      |    10 | Speaker always on                           |
   |      |       |                                             |
   |      |    11 | Speaker on during handshake                 |
   |------+-------+---------------------------------------------|
   | 6 -  |   000 | Basic result codes only enabled             |
   |  4   |       |                                             |
   |      |   100 | Basic and connection speed result codes     |
   |      |       | enabled                                     |
   |      |   101 |                                             |
   |      |       | Basic and connection speed result codes and |
   |      |   110 | dialtone detection enabled                  |
   |      |       |                                             |
   |      | i 111 | All result codes except dialtone detection  |
   |      |       | enabled                                     |
   |      |       |                                             |
   |      |       | All result codes enabled                    |
   |------+-------+---------------------------------------------|
   |  7   |   i 0 | 39/61ms at 10pps (North America)            |
   |      |       |                                             |
   |      |     1 | 33/67ms at 10pps (Europe)                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BIT-MAPPED REGISTER S23                   |
   |------------------------------------------------------------|
   | Format       | AT [cmds] S23=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Default:     | 7                                           |
   |--------------+---------------------------------------------|
   | 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 | Remote digital loopback denied              |
   |      |       |                                             |
   |      |   i 1 | Remote digital loopback allowed             |
   |------+-------+---------------------------------------------|
   | 2, 1 |    00 | Sets serial port speed to 0-300bps          |
   |      |       |                                             |
   |      |    01 | Sets serial port speed to 600bps            |
   |      |       |                                             |
   |      |    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:          | 64                                     |
   |-------------------+----------------------------------------|
   | Range:            | 0-64                                   |
   |-------------------+----------------------------------------|
   | Unit:             | Bit-mapped                             |
   |-------------------+----------------------------------------|
   | Description:      | Selects ITU-T/Bell modes               |
   |------------------------------------------------------------|
   |  Bit  |  Value   |                Function                 |
   |-------+----------+-----------------------------------------|
   | 5 - 0 | i 000000 | Not used                                |
   |-------+----------+-----------------------------------------|
   |   6   |        0 | ITU/T mode                              |
   |       |          |                                         |
   |       |      i 1 | Bell mode                               |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            DIAL                            |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] D<#> [cmds]                       |
   |--------------+---------------------------------------------|
   | 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.                                   |
   |--------------+---------------------------------------------|
   |   Modifier   |                  Function                   |
   |--------------+---------------------------------------------|
   |      L       | Re-dial last number                         |
   |--------------+---------------------------------------------|
   |      P       | Pulse dialing enabled                       |
   |--------------+---------------------------------------------|
   |      R       | Answer mode enabled, originate mode         |
   |              | disabled following handshake initiation     |
   |--------------+---------------------------------------------|
   |     S=n      | Dial stored telephone number n              |
   |--------------+---------------------------------------------|
   |      T       | Tone dialing enabled                        |
   |--------------+---------------------------------------------|
   |      W       | Dialing resumed following dial tone         |
   |              | detection                                   |
   |--------------+---------------------------------------------|
   |      ,       | Dialing paused for amount of time specified |
   |              | in S8 register                              |
   |--------------+---------------------------------------------|
   |      !       | Modem commanded to go off-hook for          |
   |              | specified time before returning on-hook     |
   |--------------+---------------------------------------------|
   |      @       | Wait for quiet answer                       |
   |--------------+---------------------------------------------|
   |      ;       | Modem returned to command state after       |
   |              | dialing                                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     REPORT INFORMATION                     |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] In [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Displays information requested              |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      I0      | Reports product code, e.i. 24x, the x       |
   |              | represents the revision level               |
   |--------------+---------------------------------------------|
   |      I1      | Reports ROM checksum                        |
   |--------------+---------------------------------------------|
   |      I2      | Reports 'OK'                                |
   |--------------+---------------------------------------------|
   |      I3      | Reports product number                      |