AUTO-RELIABLE FALLBACK CHARACTER
Type:	Register
Format:	AT [cmds] %An [cmds]
Example:	AT%A0 <CR>
Default:	0
Range:	0-127
Unit:	ASCII
Description:	Sets the character used as the auto-reliable fallback character. %A0 will disable this function.

AUTO-RELIABLE TIME BUFFER CONFIGURATION
Type:	Configuration
Format:	AT [cmds] \Cn [cmds]
Example:	AT \C1 &W<CR>
Description:	Controls the handling of incoming data during auto-reliable time period.
Command	Function
\CO	Data is discarded.
\C1	Data is buffered.
\C2	Data is discarded, sets to normal mode and sends auto-reliable character to serial port.

AUTO-RETRAIN
Type:	Configuration
Format:	AT [cmds] %En [cmds]
Example:	AT %E1 <CR>
Description:	Selects auto-retrain mode.
Command	Function
%E0	Auto-retrain disabled.
%E1	Auto-retrain enabled.

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14=n [cmds]
Example:		ATS14=10 <CR>
Default:		10
Range:		0 - 174
Unit:		Bit-mapped
Description:		Controls echo commands, result codes, pulse/tone dialing, and answer/originate modes.
Bit	Value		Function
0	0		Not used.
1	0 1		Echo disabled. Echo enabled.
2	0 1		Result codes disabled. Result codes enabled.
3	0 1		Numeric form. Verbose form.
4	0		Not used.
5	0 1		Tone dialing enabled. Pulse dialing enabled.
6	0		Not used.
7	0 1		Answer enabled. Originate enabled.

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Example:		ATS21=4<CR>
Default:		4
Range:		0 - 253
Unit:		Bit-mapped
Description:		Controls jack type, CTS signal, low DTR action, DCD signal, DSR 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 1		DSR forced high. DSR normal.
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=117<CR>
Default:		117
Range:		0-127
Unit:		Bit-mapped
Description:		Controls speaker volume and controls, and limits results codes.
Bit	Value		Function
1, 0	00 01 10 11		Off volume. Low volume. Medium level volume. High level volume.
3, 2	00 01 10 11		Speaker off. Speaker off on carrier. Speaker always on. Speaker on during handshake.
6, 5, 4	000 100 101 110 111		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]
Example:		ATS23=183<CR>
Default:		183
Range:		0-255
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	000 001 010 011 100 101 110		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	00 10 11		Parity even. Parity odd. No parity.
7, 6	00 01 10		Guard tone disabled. Guard tone disabled. Guard tone 1800Hz enabled.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B3 &W<CR>
Range:	1-9
Unit:	100ms
Description:	Sends break to modem.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] \Kn [cmds]
Example:	AT \K1 <CR>
Description:	Configures action of break signal.
Command		Break from DTE	Modem receives \B	Break received from remote modem
\K0		Online command mode enabled, send no break to remote modem.	Break sent to remote modem and buffered cleared.	Buffers cleared, break sent to DTE.
\K1		Break sent to remote modem and buffered cleared.	Break sent to remote modem and buffered cleared.	Buffers cleared, break sent to DTE.
\K2		Online command mode enabled, send no break to remote modem.	Send break to remote modem immediately.	Break sent immediately to DTE.
\K3		Send break to remote modem immediately.	Send break to remote modem immediately.	Break sent immediately to DTE.
\K4		Online command mode enabled, send no break to remote modem.	Send break with transmitted data.	Break sent with received data to the DTE.
\K5		Send break with transmitted data.	Send break with transmitted data.	Break sent with received data to the DTE.

COMPRESSION
Type:	Configuration
Format:	AT %Cn
Example:	AT \N7 %C1 *AP0<CR>
Description:	Selects data compression.
Command	Function
%C0	Data compression disabled.
%C1	Data compression enabled.

CONNECT MODE
Type:	Configuration
Format:	AT [cmds] \Nn [cmds]
Example:	AT \N1 DT555-1212<CR>
Description:	Sets connect mode.
Command	Function
\N0	Normal mode enabled.
\N1	Normal mode enabled.
\N2	Reliable MNP mode enabled.
\N3	Auto-reliable MNP mode enabled.
\N4	Reliable LAPM mode enabled.
\N5	Auto-reliable LAPM mode enabled.
\N6	Reliable LAPM mode with fallback to MNP enabled.
\N7	Auto-reliable LAPM mode with fallback to MNP enabled.

CONNECTION SPEED LOWER LIMIT
Type:	Configuration
Format:	AT [cmds] %Mn [cmds]
Example:	AT %M300 \JO<CR>
Description:	Sets slowest allowed connection speed.
Command	Function
%M300	Select 300bps minimum speed.
%M1200	Select 1200bps minimum speed.
%M2400	Select 2400bps minimum speed.
%M4800	Select 4800bps minimum speed.
%M7200	Select 7200bps minimum speed.
%M9600	Select 9600bps minimum speed.
%M12000	Select 12Kbps minimum speed.
%M14400	Select 14.4Kbps minimum speed.

CONNECTION SPEED UPPER LIMIT
Type:	Configuration
Format:	AT [cmds] %Bn [cmds]
Example:	AT %L3 %B9600 \J0<CR>
Description:	Sets fastest allowed connection speed.
Command	Function
%B300	Select 300bps maximum speed.
%B1200	Select 1200bps maximum speed.
%B2400	Select 2400bps maximum speed.
%B4800	Select 4800bps maximum speed.
» %B9600	Select 9600bps maximum speed.
%B7200	Select 7200bps maximum speed.
%B12000	Select 12Kbps maximum speed.
%B14400	Select 14.4Kbps maximum speed.

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] \Vn [cmds]
Example:	AT \V1 %C1<CR>
Description:	Selects extended result codes.
Command	Function
\V0	Extended result codes disabled.
\V1	Reliable mode result codes enabled.
\V2	Reliable mode, error control, and compression result codes enabled.

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 - ENQ/ACK
Type:	Configuration
Format:	AT [cmds] \Hn [cmds]
Example:	AT \H9 <CR>
Description:	Selects ENQ/ACK pacing.
Command	Function
\H0	Disables ENQ/ACK pacing.
\H1	Enables ENQ/ACK pacing in terminal mode.
\H2	Enables ENQ/ACK pacing in host mode.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] \Qn [cmds]
Example:	AT \Q5<CR>
Description:	Sets type of flow control used by modem.
Command	Function
\Q0	Flow control disabled.
\Q1	Bi-directional XON/XOFF flow control enabled.
\Q2	Unidirectional CTS/RTS flow control enabled.
\Q3	Bi-directional CTS/RTS flow control enabled.
\Q4	Unidirectional XON/XOFF flow control enabled.
\Q5	Unidirectional CTS/RTS flow control enabled with CTS forced low until connect.
\Q6	Bi-directional CTS/RTS flow control enabled with CTS forced low until connect.

INACTIVITY TIMER
Type:	Configuration
Format:	AT [cmds] \Tn [cmds]
Example:	AT\T20<CR>
Default:	0
Range:	0 - 90
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects.

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.

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Configuration
Format:	AT [cmds] \An [cmds]
Example:	AT \A3 %C1<CR>
Description:	Sets the maximum transmittable block size.
Command	Function
\A0	Maximum MNP block size is 64 characters.
\A1	Maximum MNP block size is 128 characters.
\A2	Maximum MNP block size is 192 characters.
\A3	Maximum MNP block size is 256 characters.

PROTOCOL
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Example:	AT S27=64 <CR>
Description:	Selects the active protocols.
Command	Function
S27=0	ITU-T protocols.
S27=64	Bell protocols.

REPORT PRODUCT VERSION
Type:	Immediate
Format:	AT [cmds] %V [cmds]
Example:	AT I3 &V1 %V <CR>
Description:	Reports product version.

SDLC CONFIGURATION
Format		AT [cmds] S19=n [cmds]
Example:		AT S19=40 <CR>
Default:		0
Range:		0 - 22
Unit:		Bit-mapped
Description:		Controls synchronous communication mode, SDLC address detection, and SDLC idle.
Bit	Value		Function
0	0		Not used.
1	0 1		Binary synchronous communication. SDLC.
2	0 1		SDLC address detect disabled. SDLC address detect enabled.
3	0		Not used.
4	0 1		SDLC idle MARK SDLC idle FLAG

SWITCH TO MNP MODE
Type:	Configuration
Format:	AT [cmds] \Z [cmds]
Example:	AT \Z &W<CR>
Description:	Switches to normal mode from MNP mode.

TEST MODES
Format		AT [cmds] S16=n [cmds]
Example:		AT S16=40 <CR>
Default:		Unidentified
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 with self-test not in progress. Remote digital loopback with self-test in progress.
6	0 1		Local analog loopback with self-test not in progress. Local analog loopback with self-test in progress.

XON/XOFF PASS-THROUGH
Type:	Configuration
Format:	AT [cmds] \Xn [cmds]
Example:	AT \X1 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.