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, V.22bis

CONNECTIONS
Function	Label		Function		Label
Line in		CN1		Line out		CN2

USER CONFIGURABLE SETTINGS
Setting	Label	Position
í DCD normal	SW1/4	Off
DCD forced high	SW1/4	On
í RJ11, RJ14, RJ41S, or RJ45 jack type	SW1/5	Off
RJ12 or RJ13	SW1/5	On

SERIAL PORT ADDRESS
Setting	SW1/1	SW1/2
í COM1 (3F8h)	Off	Off
COM2 (2F8h)	On	Off
COM3 (3E8h)	Off	On
COM4 (2E8h)	On	On

INTERRUPT SELECTION
SETTING	SW1/3
IRQ2 (IBM PC/XT) or IRQ9 (IBM AT)	On
í IRQ3 or IRQ4	Off

SUPPORTED COMMAND SET

Basic AT Commands

AT, ‘+++’, ‘Comma’, A/

A, B, D, E, F, H, L, M, O, Q, S, V, X, Y, Z

&D, &G, &L, &P, &T

S Registers

S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S14, S16, S18, S20, S22, S23, S27

Note: See MHI Help file for full command documentation.

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Default:		0
Range:		0-184
Unit:		Bit-mapped
Description:		Selects jack type, CTS/DCD/DSR signals, low DTR action, and the long space disconnect function.
Bit	Value	Function
2 - 0	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:		118
Range:		0-255
Unit:		Bit-mapped
Description:		Controls speaker volume and controls, dial mode, call progress, connect message, and pulse dial make/break ratio.
Bit	Value	Function
1, 0	00 01 í 10 11	Low 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
4	0 í 1	Blind dial Wait for dial tone then proceed with the call
5	0 í 1	Call progress disabled Call progress enabled
6	0 í 1	‘CONNECT’ message only ‘CONNECT XXXX’ message
7	í 0 1	39/61ms at 10pps (North America) 33/67ms at 10pps (Europe)

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Default:		64
Range:		0-66
Unit:		Bit-mapped
Description:		Selects line type, and ITU-T/Bell modes.
Bit	Value	Function
1, 0	00	Not used
2	í 0 1	Switched line Leased line
5 - 3	000	Not used
6	0 í 1	ITU/T mode Bell mode

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports product code
I1	Reports ROM checksum
I2	Reports current speed, data bits, and parity