Card Type	Modem(asynchronous)
Chip Set	Unidentified
Maximum Data Rate	2400bps
Data Bus	8 bit ISA
Data Modulation Protocol	Bell 103A/212A ITU-T V.21, V.22, V.22bis

CONNECTIONS
Function	Label		Function		Label
Line in		CN1		Line out		CN2

SERIAL PORT ADDRESS
Setting	J2	J3
í COM1 (3F8h)	Pins 2 & 3 closed	Pins 2 & 3 closed
COM2 (2F8h)	Pins 2 & 3 closed	Pins 1 & 2 closed
COM3 (3E8h)	Pins 1 & 2 closed	Pins 2 & 3 closed
COM4 (2E8h)	Pins 1 & 2 closed	Pins 1 & 2 closed

INTERRUPT
Setting	J1
2	Pins 1 & 2 closed
3	Pins 1 & 3 closed
í 4	Pins 1 & 4 closed
5	Pins 1 & 5 closed

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14=n [cmds]
Default:		170
Range:		0-174
Unit:		Bit-mapped.
Description:		Controls echo, result codes, result code display, dial mode, and answer/originate mode
Bit	Value	Function
0	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	0	Not used
5	0 í 1	Tone dial enabled Pulse dial enabled
6	0	Not used
7	0 í 1	Answer mode enabled Originate mode enabled

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Default:		16
Range:		0 - 184
Unit:		Bit-mapped.
Description:		Selects low DTR action, DCD signal, and the Long Space Disconnect function.
Bit	Value	Function
0	0	Not used.
1	0	Not used.
2	0	Not used.
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	0 í 1	DCD forced high. DCD normal.
6	0	Not used.
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:		117
Range:		0-127
Unit:		Bit-mapped
Description:		Controls speaker volume and controls, and limits results codes
Bit	Value	Function
1, 0	01 í 10 11	On volume Medium level volume High level volume
3, 2	00 í 01 10 11	Speaker off Speaker off until carrier detect 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 dial tone detection enabled All result codes except dial tone detection enabled All result codes enabled
7	í 00 01	Make/break ratio 39%/61% Make/break ratio 33%/67%

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 í 1	Remote digital loopback disabled Remote digital loopback enabled
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	0	Not used
5,4	í 00 01 10 11	Parity even Space Parity odd No Parity
7, 6	í 00 01 10	Guard tone disabled Guard tone 550Hz enabled Guard tone 1800Hz enabled

PROTOCOL
Format		AT [cmds] S27=n [cmds]
Default:		32
Range:		0 - 32
Unit:		Bit-mapped
Description:		Selects operating protocol
Bit	Value	Function
0	0	Not used
1	0	Not used
2	0	Not used
3	0	Not used
4	0	Not used
5	0	Not used
6	0 í 1	CCITT V.22bis/V.22 enabled Bell 212 enabled

TEST MODES
Format		AT [cmds] S16=n [cmds]
Default:		0
Range:		0-125
Unit:		Bit-mapped
Description:		Controls loopback tests, analog, digital, remote digital, and self tests.
Bit	Value	Function
0	í 0 1	Local analog loopback disabled Local analog loopback enabled
1	0	Not used.
2	í 0 1	Local digital loopback disabled Local digital loopback enabled
3	í 0 1	Modem not in remote digital loopback. Remote digital loopback in progress.
4	í 0 1	Remote digital loopback disabled Remote digital loopback enabled
5	í 0 1	Remote digital loopback w/ self-test disabled Remote digital loopback w/ self-test enabled
6	í 0 1	Local analog loopback w/ self-test disabled Local analog loopback w/ self-test enabled