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# 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 | í 0 | Not used |
|------+-------+---------------------------------------------|
| 1 | 0 | Command echo disabled |
| | | |
| | í 1 | Command echo enabled |
|------+-------+---------------------------------------------|
| 2 | í 0 | Result codes enabled |
| | | |
| | 1 | Result codes disabled |
|------+-------+---------------------------------------------|
| 3 | 0 | Display result codes in numeric format |
| | | |
| | í 1 | Display result codes in verbose format |
|------+-------+---------------------------------------------|
| 4 | í 0 | Not used |
|------+-------+---------------------------------------------|
| 5 | 0 | Tone dial enabled |
| | | |
| | í 1 | Pulse dial enabled |
|------+-------+---------------------------------------------|
| 6 | í 0 | Not used |
|------+-------+---------------------------------------------|
| 7 | 0 | Answer mode enabled |
| | | |
| | í 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 | í 0 | Selects RJ-11, RJ-41S, or RJ45S jack |
| | | |
| | 1 | Selects RJ-12 or RJ-13 jack |
|------+-------+---------------------------------------------|
| 2, 1 | í 00 | Not used |
|------+-------+---------------------------------------------|
| 4, 3 | í 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 | í 0 | DCD forced high |
| | | |
| | 1 | DCD normal |
|------+-------+---------------------------------------------|
| 6 | í 0 | Not used |
|------+-------+---------------------------------------------|
| 7 | í 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 |
| | | |
| | í 10 | Medium level volume |
| | | |
| | 11 | High level volume |
|------+-------+---------------------------------------------|
| 3, 2 | 00 | Speaker off |
| | | |
| | í 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 |
| | | |
| | í 111 | All result codes except dialtone detection |
| | | enabled |
| | | |
| | | All result codes enabled |
|------+-------+---------------------------------------------|
| 7 | í 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 |
| | | |
| | í 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 |
| | | |
| | í 11 | Sets serial port speed to 2400bps |
|------+-------+---------------------------------------------|
| 3 | í 0 | Not used |
|------+-------+---------------------------------------------|
| 5, 4 | í 00 | Parity even |
| | | |
| | 01 | Space parity |
| | | |
| | 10 | Parity odd |
| | | |
| | 11 | Mark or no parity |
|------+-------+---------------------------------------------|
| 7, 6 | í 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 | í 000000 | Not used |
|-------+----------+-----------------------------------------|
| 6 | 0 | ITU/T mode |
| | | |
| | í 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 |