PM2400SA modem/telephone/ISDN Settings and Configuration

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

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.

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 1	Selects RJ-11, RJ-41S, or RJ45S jack Selects RJ-12 or RJ-13 jack
1	í 0	Not used
2	0 1	*Software driven *Software driven
4, 3	í 00 01 10 11	DTR signal ignored Modem goes to command mode on low DTR Modem disconnects on low DTR; Auto-Answer is disabled Modem is initialized on low DTR
5	í 0 1	DCD forced high DCD normal
6	0 1	*Software driven *Software driven
7	í 0 1	Long space disconnect function disabled 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 1	*Software driven *Software driven
2, 1	00 01 10 í 11	Sets serial port speed to 0-300bps Not used Sets serial port speed to 1200bps Sets serial port speed to 2400bps
3	í 0	Not used
5, 4	í 00 01 10 11	Parity even Space parity Parity odd Mark or no parity
7, 6	í 00 01 10 11	Guard tone disabled Guard tone 550Hz enabled Guard tone 1800Hz enabled 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 01 10 11	Asynchronous mode *Software driven *Software driven *Software driven
3, 2	í 00	Not used
5, 4	00 01 10 11	*Software driven *Software driven *Software driven *Software driven
6	0 í 1	ITU/T mode 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