CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	Line in	CN2

BASE I/O ADDRESS SELECTION
Port	JP1	JP2	JP3	JP4	JP5	JP6
COM1: (3F8h)	Open	Open	Open	Open	Open	Closed
COM2: (2F8h)	Closed	Open	Open	Open	Closed	Open
COM3: (3E8h)	Open	Closed	Open	Open	Open	Closed
COM4: (2E8h)	Closed	Closed	Open	Open	Closed	Open
COM5: (3F0h)	Open	Open	Closed	Open	Open	Open
COM6: (2F0h)	Closed	Open	Closed	Open	Open	Open
COM7: (3E0h)	Open	Closed	Closed	Open	Open	Open
COM8: (2E0h)	Closed	Closed	Closed	Open	Open	Open

INTERRUPT SELECTION
IRQ	JP4	JP5	JP6	JP7	JP8
2	Closed	Open	Open	Open	Open
3	Open	Closed	Open	Open	Open
4	Open	Open	Closed	Open	Open
5	Open	Open	Open	Closed	Open
7	Open	Open	Open	Open	Closed

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14=n [cmds]
Example:		ATS14=138<CR>
Default:		138
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 » 1		Command echo disabled. Command echo enabled.
2	» 0 1		Result codes enabled. Result codes disabled.
3	0 » 1		Display result codes in numeric format. Display result codes in verbose format.
4	0		Not used.
5	» 0 1		Tone dial enabled. Pulse dial enabled.
6	0		Not used.
7	0 » 1		Answer mode enabled. Originate mode enabled.

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Example:		ATS21=48<CR>
Default:		48
Range:		0 - 189
Unit:		Bit-mapped.
Description:		Selects jack type, CTS signal, low DTR action, DCD signal, and the Long Space Disconnect function.
Bit	Value		Function
0	» 0 1		Selects RJ-11, RJ-41S, or RJ45S jack. Selects RJ-12 or RJ-13 jack.
1	0		Not used.
2	» 0 1		CTS follows RTS. CTS forced high.
4, 3	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 » 1		DCD forced high. DCD normal.
6	0		Not used.
7	» 0 1		Long Space Disconnect function disabled. Long Space Disconnect function enabled.

BIT-MAPPED REGISTER S22
Format		AT [cmds] S22=n [cmds]
Example:		ATS22=118<CR>
Default:		118
Range:		0 - 255
Unit:		Bit-mapped.
Description:		Controls volume and speaker settings, result codes, and make/break pulse ratio.
Bit	Value		Function
1, 0	00 01 » 10 11		Lowest volume setting. Low volume setting. Medium volume setting Highest volume setting.
3, 2	00 » 01 10 11		Speaker disabled. Speaker enabled until carrier signal detected Speaker enabled. Speaker enabled following dialing, then disabled after carrier signal detected.
6, 5 ,4	000 100 101 110 » 111		Busy and dialtone detection disabled, result codes 0-4 enabled. Busy and dialtone detection disabled, result codes 0-5, 10 enabled. Busy tone detection disabled, dialtone detection enabled, result codes 0-6, 10 enabled. Busy tone detection enabled, dialtone detection disabled, result codes 0-5, 7, 10 enabled. Busy and dialtone detection enabled, result codes 0-7, 10 enabled.
7	» 0 1		39/61ms at 10pps (North America) 33/67ms at 10pps (Europe)

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Example:		ATS23=28<CR>
Default:		28
Range:		0-191
Unit:		Bit-mapped.
Description:		Grants/denies remote digital loopback, controls DTE rate and parity, and sets guard tone.
Bit	Value		Function
0	0 » 1		Remote digital loopback denied. Remote digital loopback allowed.
3, 2, 1	000 010 011 100 101 » 110 111		Sets serial port speed to 0-300bps. 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 19.2Kbps. Sets serial port speed to 38.4Kbps.
5,4	00 » 01 10 11		Parity even. Space parity. Parity odd. Mark or no parity.
7, 6	» 00 01 10		Guard tone disabled. Guard tone disabled. Guard tone 1800Hz enabled.

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Example:		AT S27=0 <CR>
Default:		0
Range:		0 - 119
Unit:		Bit-mapped.
Description:		Selects sync/async mode, Line type, internal clock, and ITU-T/Bell modes.
Bit	Value		Function
1, 0	» 00 01 10 11		Asynchronous mode, serial port speed follows connect speed. Asynchronous command mode and synchronous connect mode. Asynchronous command mode and synchronous connect mode, DTR dialing enabled. Asynchronous command mode on low DTR, synchronous connect mode on high DTR.
2	» 0 1		Dial up line. Leased line.
3	0		Not used.
5, 4	» 00 01 10		Modem generates clock. DTE generates clock. Modem generates clock from the receive carrier signal.
6	» 0 1		CCITT mode. Bell mode.

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Example:	AT &M2 H1 DT555-1212<CR>
Description:	Selects the active communications mode.
Command	Function
» &M0	Asynchronous command and data modes.

DIAL INTERRUPT
Type:	Configuration
Format:	AT [cmds] *Pn [cmds]
Example:	AT *P9 S8=1<CR>
Description:	Controls the dial interrupt.
Command	Function
» *P0	Dial interrupt enabled.
*P1	Dial interrupt disabled.

ECHO DATA
Type:	Configuration
Format:	AT [cmds] \En [cmds]
Example:	AT \E0 <CR>
Description:	Enables modem to echo received data.
Command	Function
» \E0	Data echo disabled.
\E1	Data echo enabled.

ESCAPE SEQUENCE MODE
Type:	Configuration
Format:	AT [cmds] *En [cmds]
Example:	AT *E1<CR>
Description:	Selects modem escape sequence mode.
Command	Function
*E0	Hayes ESC sequence mode.
» *E1	TIES ESC sequence mode.

ERROR CORRECTION REJECTION
Format		AT [cmds] S36=n [cmds]
Example:		ATS36=0<CR>
Default:		7
Range:		0 - 7
Unit:		Bit-mapped.
Description:		Configures the modem’s behavior if an error-correcting connection cannot be made.
Bit	Value		Function
0 - 2	000 001 011 100 101 » 111		Modem disconnects. Modem attempts MNP connection. If it fails, modem attempts direct connection. Modem attempts MNP connection. If it fails, modem attempts normal connection. Modem attempts MNP connection. If it fails, modem disconnects. Modem attempts MNP connection. If it fails, modem attempts direct connection. Modem attempts MNP connection. If it fails, modem attempts normal connection.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] \Gn [cmds]
Example:	AT \G1 &K3<CR>
Description:	Selects modem port flow control.
Command	Function
» \G0	Flow control disabled.
\G1	Flow control enabled.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] \Qn [cmds]
Example:	AT \Q0 A <CR>
Description:	Sets type of flow control used by modem.
Command	Function
\Q0	Flow control disabled.
\Q1	XON/XOFF flow control enabled.
\Q2	CTS flow control to DTE enabled.
» \Q3	RTS/CTS flow control enabled.

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Example:	AT &L H1 DT555-1212<CR>
Description:	Selects line type.
Command	Function
» &L0	Switched line.

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] \Jn [cmds]
Example:	AT %L3 %B14 \J0<CR>
Description:	Sets operation of serial port speed.
Command	Function
» \J0	Serial speed locked.
\J1	Serial speed follows connect speed.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Example:	AT I1 O<CR>
Description:	Displays modem properties.
Command	Function
I0	Reports product code.
I1	Reports factory configuration.
I2	Reports firmware checksum.
I4	Reports firmware version.
I5	Reports Memory test.

PROTOCOL/SPEED
Type:	Configuration
Format:	AT [cmds] *Nn [cmds]
Example:	AT *N6<CR>
Description:	Selects the current DCE speed.
Command	Function
*N0	Select 1200bps speed.
*N1	Select 2400bps speed.
*N2	Select 4800bps speed.
*N3	Select 9600bps speed.
*N4	Select 7200bps speed.
*N5	Select 12Kbps speed.
» *N6	Select 14.4Kbps speed.

RETRAIN SENSITIVITY
Type:	Configuration
Format:	AT [cmds] *Qn [cmds]
Example:	AT &C3 *Q1<CR>
Description:	Controls retrain.
Command	Function
» *Q0	Modem retrain disabled.
*Q1	Modem retrain enabled.

SECURITY MODE
Type:	Configuration
Format:	AT [cmds] *Gn [cmds]
Example:	AT *G0<CR>
Description:	Controls adaptive handshake.
Command	Function
*G0	Adaptive handshake disabled.
» *G1	Adaptive handshake enabled.

TEST MODES
Format		AT [cmds] S16=n [cmds]
Example:		ATS16=40<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.

TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] *Xn [cmds]
Example:	AT *X4 &W<CR>
Description:	Sets the signal level for transmission.
Command	Function
*X0	-2dBm.
*X1	-4dBm.
*X2	-6dBm.
*X3	-8dBm.
» *X4	-10dBm.
*X5	-12dBm.
*X6	-14dBm.

TRELLIS MODULATION
Type:	Configuration
Format:	AT [cmds] *Tn [cmds]
Example:	AT *T1<CR>
Description:	Controls Trellis Coded Modulation.
Command	Function
*T0	Disables TCM.
» *T1	Enables TCM.

XON/XOFF PASS-THROUGH
Type:	Configuration
Format:	AT [cmds] \Xn [cmds]
Example:	AT \X7 O<CR>
Description:	Selects whether XON/XOFF signals are sent to remote modem.
Command	Function
» \X0	XON/XOFF signals trapped by local modem.
\X1	XON/XOFF passed through local modem.