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

CONNECTIONS
Function	Label		Function		Label
Line out		CN1		Line in		CN2

SERIAL PORT ADDRESS
Setting	JP1/A	JP1/B	JP1/C	JP1/D
í COM1 (3F8h)	Closed	Open	Open	Open
COM2 (2F8h)	Open	Closed	Open	Open
COM3 (3E8h)	Open	Open	Closed	Open
COM4 (2E8h)	Open	Open	Open	Closed

INTERRUPT
Setting	JP1/E	JP1/F	JP1/G	JP1/H
3	Closed	Open	Open	Open
í 4	Open	Closed	Open	Open
5	Open	Open	Closed	Open
7	Open	Open	Open	Closed

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 í 1	Command echo disabled Command echo enabled
2	í 0 1	Result codes enabled Result codes disabled
3	0 í 1	Display result codes in numeric format Display result codes in verbose format
4	í 0	Not used
5	0 í 1	Tone dial enabled Pulse dial enabled
6	í 0	Not used
7	0 í 1	Answer mode enabled Originate mode enabled

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Default:		0
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	í 0 1	CTS follows RTS CTS forced high
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	í 0 1	DSR forced high DSR normal
7	í 0 1	Long space disconnect function disabled Long space disconnect function enabled

BIT-MAPPED REGISTER S22
Format		AT [cmds] S22=n [cmds]
Default:		118
Range:		0-127
Unit:		Bit-mapped
Description:		Controls speaker volume and controls, and limits results codes.
Bit	Value	Function
1, 0	00 í 01 10 11	Off volume Low level volume Medium level volume High level volume
3, 2	00 í 01 10 11	Speaker off Speaker off on carrier Speaker always on Speaker on during handshake
6, 5, 4	000 100 101 110 í 111	Basic result codes only enabled Basic and connection speed result codes enabled Basic and connection speed result codes and dialtone detection enabled All result codes except dialtone detection enabled All result codes enabled

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Default:		7
Range:		0-189
Unit:		Bit-mapped
Description:		Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone.
Bit	Value	Function
0	0 í 1	Remote digital loopback denied Remote digital loopback allowed
3, 2, 1	000 001 010 í 011 100 101 110	Sets serial port speed to 0-300bps Sets serial port speed to 600bps Sets serial port speed to 1200bps Sets serial port speed to 2400bps Sets serial port speed to 4800bps Sets serial port speed to 9600bps Sets serial port speed to 19200bps
5,4	í 00 01 10 11	Parity even Not used Parity odd No Parity
7, 6	í 00 01 10	Guard tone disabled Guard tone disabled Guard tone 1800Hz enabled

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Default:		9
Range:		0-109
Unit:		Bit-mapped
Description:		Selects line type, clock source, and ITU-T/Bell modes.
Bit	Value	Function
3, 1, 0	í 101	Not used
2	í 0 1	Switched line Leased line
5, 4	í 00 01 10	Local modem generates transmit clock source Local DTE generates transmit clock source Remote DCE/DTE generates transmit clock source
6	í 0 1	ITU/T mode Bell mode

BIT-MAPPED REGISTER S28
Format		AT [cmds] S28=n [cmds]
Default:		0
Range:		0-31
Unit:		Bit-mapped
Description:		Controls V.23 split speed, transmit/receive speed, half duplex; and pulse dialing.
Bit	Value	Function
0	í 0 1	V.23 split speed operation disabled V.23 split speed operation enabled
1	í 0 1	75bps transmit, 1200bps receive disabled 1200bps transmit, 75bps receive enabled
2	í 0 1	V.23 half-duplex disabled 1200bps transmit, 1200bps receive enabled
4, 3	í 00 01 10 11	39ms make/61ms break at 10pps 33ms make/67ms break at 10pps 39ms make/61ms break at 20pps 33ms make/67ms break at 20pps

BIT-MAPPED REGISTER S31
Format:			AT [cmds] S31=n [cmds]
Default:			2
Range:			0-10
Unit:			Bit-mapped
Description:			Controls auto-baud function and result codes
Bit	Value			Function
0	í 0			Not used
1		0 í 1			Auto-baud disabled Auto-baud enabled
3, 2		í 00 01 10			DTE speed displayed in result codes Extended result codes enabled; DCE speed displayed in result codes. DCE speed displayed in result codes

BIT-MAPPED REGISTER S39
Format		AT [cmds] S39=n [cmds]
Default:		3
Range:		0-6
Unit:		Bit-mapped
Description:		Controls flow control
Bit	Value	Function
2, 1, 0	000 í 011 100 101 110	Flow control disabled Hardware flow control enabled Normal software flow control enabled Transparent software flow control enabled Both hardware and software flow control enabled

BIT-MAPPED REGISTER S40
Format		AT [cmds] S40=n [cmds]
Default:		105
Range:		0-239
Unit:		Bit-mapped
Description:		Controls power level and break handling; selects MNP extended services, link negotiation, and block size.
Bit	Value	Function
0	0 í 1	MNP extended services disabled MNP extended services enabled
1	í 0 1	Power level adjustment enabled Power level adjustment disabled
2	í 0 1	Link will be negotiated at highest possible speed Link will be negotiated at 1200bps
5, 4, 3	000 001 010 011 100 í 101	\K0 \K1 \K2 \K3 \K4 \K5
7, 6	00 í 01 10 11	MNP block size is 64 characters MNP block size is 128 characters MNP block size is 192 characters MNP block size is 256 characters

BIT-MAPPED REGISTER S41
Format		AT [cmds] S41=n [cmds]
Default:		3
Range:		0-31
Unit:		Bit-mapped
Description:		Selects compression, auto-retrain, flow control, and MNP mode.
Bit	Value	Function
1 - 0	00 01 10 í 11	Data compression disabled MNP5 enabled V.42bis enabled MNP5 and V.42bis enabled
2	í 0 1	Auto-retrain disabled Auto-retrain enabled
3	í 0 1	Flow control disabled Flow control enabled
4	í 0 1	Stream mode for MNP Block mode for MNP

FLOW CONTROL CHARACTER - XOFF
Type:	Register
Format:	AT [cmds] S33=n [cmds]
Default:	19
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XOFF

FLOW CONTROL CHARACTER - XON
Type:	Register
Format:	AT [cmds] S32=n [cmds]
Default:	17
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XON

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Display product identification code
I1	Display ROM checksum
I2	Display OK or ERROR for ROM checksum
I3	Display firmware revision
I4	Display OEM string
I5	Display country code
I6	Display data pump model

SLEEP TIMER
Type:	Register
Format	AT [cmds] S24=n [cmds]
Default:	0
Range:	0-255
Unit:	1 second
Description:	Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode.

S-REGISTER - CONTENTS
Type:	Immediate
Format:	AT [cmds] ? [cmds]
Description:	Displays contents of last S-register access

TEST MODES
Type:		Register
Format		AT [cmds] S16=n [cmds]
Default:		128
Range:		0-128
Unit:		Bit-mapped
Description:		Controls loopback tests, analog, digital, remote digital, and self tests.
Bit	Value	Function
0	í 0 1	Local analog loopback not in progress Local analog loopback in progress
1	í 0	Not used
2	í 0 1	Local digital loopback not in progress Local digital loopback in progress
3	í 0 1	Modem not in remote digital loopback Remote digital loopback in progress
4	í 0 1	Remote digital loopback not requested Remote digital loopback requested
5	í 0 1	Remote digital loopback w/ error count not in progress Remote digital loopback w/ error count in progress
6	í 0 1	Local analog loopback w/ self-test not in progress Local analog loopback w/ self-test in progress
7	í 1	Not used

TRANSMISSION LEVEL - PSTN
Type	Register
Format	AT [cmds] S91=n [cmds]
Default	10
Range	0-15
Unit	-1 dBm
Description	Sets the signal level for transmission over switched phone lines

TRANSMISSION LEVEL - FAX
Type:	Register
Format:	AT [cmds] S92=n [cmds]
Default:	10
Range:	0-15
Unit:	-1 dBm
Description:	Sets the signal level for transmission while in fax mode