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# 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 | í 0 | Selects RJ-11, RJ-41S, or RJ45S jack |
| | | |
| | 1 | Selects RJ-12 or RJ-13 jack |
|------+-------+---------------------------------------------|
| 1 | í 0 | Not used |
|------+-------+---------------------------------------------|
| 2 | 0 | *Software driven |
| | | |
| | 1 | *Software driven |
|------+-------+---------------------------------------------|
| 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 | 0 | *Software driven |
| | | |
| | 1 | *Software driven |
|------+-------+---------------------------------------------|
| 7 | í 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 |
| | | |
| | 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: | Unidentified |
|--------------+---------------------------------------------|
| Range: | 0-115 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Selects synchronous*/asynchronous mode, |
| | clock source*, and ITU-T/Bell modes. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 1, 0 | í 00 | Asynchronous mode |
| | | |
| | 01 | *Software driven |
| | | |
| | 10 | *Software driven |
| | | |
| | 11 | *Software driven |
|------+-------+---------------------------------------------|
| 3, 2 | í 00 | Not used |
|------+-------+---------------------------------------------|
| 5, 4 | 00 | *Software driven |
| | | |
| | 01 | *Software driven |
| | | |
| | 10 | *Software driven |
| | | |
| | 11 | *Software driven |
|------+-------+---------------------------------------------|
| 6 | 0 | ITU/T mode |
| | | |
| | í 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 |