CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	Line in	CN2

BASE I/O ADDRESS SELECTION
Port	JP1/A	JP1/B	JP1/C	JP1/D
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 SELECTION
IRQ	JP1/E	JP1/F	JP1/G	JP1/H
3	Closed	Open	Open	Open
4	Open	Closed	Open	Open
» 5	Open	Open	Closed	Open
7	Open	Open	Open	Closed

BIT-MAPPED REGISTERS
Registers	Default
S14	138
S21	4
S22	117
S23	55
S27	73
S28	0

PROTOCOL/SPEED
Type:	Register
Format	AT [cmds] S19=n [cmds]
Example:	ATS19=0<CR>
Default:	0
Range:	Unidentified
Unit:	Unidentified
Description:	Selects the current protocol and speed.

SLEEP TIMER
Type:	Register
Format	AT [cmds] S24=n [cmds]
Example:	ATS24=0<CR>
Default:	0
Range:	Unidentified
Unit:	Unidentified
Description:	Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode.

TEST MODES
Type:		Register
Format		AT [cmds] S16=n [cmds]
Example:		ATS16=0<CR>
Default:		0
Range:		0-125
Unit:		Bit-mapped
Description:		Controls loopback tests, analog, digital, remote digital, and self tests.
Bit	Value		Function
0	0 1		Local analog loopback not in progress. Local analog loopback in progress.
1	0		Not used.
2	0 1		Local digital loopback not in progress. Local digital loopback in progress.
3	0 1		Modem not in remote digital loopback. Remote digital loopback in progress.
4	0 1		Remote digital loopback not requested. Remote digital loopback requested.
5	0 1		Remote digital loopback w/ self-test not in progress. Remote digital loopback w/ self-test in progress.
6	0 1		Local analog loopback w/ self-test not in progress. Local analog loopback w/ self-test in progress.