AUTO-RELIABLE FALLBACK CHARACTER
Type:	Configuration
Format:	AT [cmds] %An [cmds]
Example:	AT%A20<CR>
Default:	Unidentified
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] &On [cmds]
Example:	AT &O1 &Q4<CR>
Description:	Controls the handling of incoming data during auto-reliable time period.
Command	Function
&O0	Data is discarded.
&O1	Data is buffered.

AUTO-RELIABLE TIME BUFFER CONFIGURATION
Type:	Configuration
Format:	AT [cmds] \Cn [cmds]
Example:	AT \C1 \B<CR>
Description:	Controls the handling of incoming data during auto-reliable time period.
Command	Function
\C0	Data is discarded.
\C1	Data is buffered.
\C2	Data is discarded, modem returns to normal mode on receiving auto-reliable fallback character.

AUTO-RETRAIN
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E0 H1<CR>
Description:	Selects auto-retrain mode.
Command	Function
&E0	Auto-retrain disabled.
&E1	Auto-retrain enabled.

AUTO-RETRAIN
Type:	Configuration
Format:	AT [cmd] %En [cmd]
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? [cmds]
Example:		ATS14?<CR>
Default:		Read only
Range:		0-255
Unit:		Bit-mapped
Description:		Reports echo, result codes, result code display, dumb mode, dial mode, and answer/originate mode.
Bit	Value		Meaning
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 1		Dumb mode disabled. Dumb mode enabled.
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? [cmds]
Example:		ATS21?<CR>
Default:		Read only
Range:		0 - 255
Unit:		Bit-mapped
Description:		Reports jack type, CTS signal, low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function.
Bit	Value		Meaning
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? [cmds]
Example:		ATS22?<CR>
Default:		Read only
Range:		0-255
Unit:		Bit-mapped
Description:		Reports speaker volume and controls, limits results codes and make-break ratio.
Bit	Value		Meaning
1, 0	00 01 10 11		Off volume. On 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	000 001 010 011 100		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.
7	0 1		Pulse dial make-break 39%/61%. Pulse dial make-break 33%/67%.

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23? [cmds]
Example:		ATS23?<CR>
Default:		Read only
Range:		0-255
Unit:		Bit-mapped
Description:		Reports remote digital loopback, DTE rate and parity, and guard tone.
Bit	Value		Meaning
0	0 1		Remote digital loopback denied. Remote digital loopback allowed.
3, 2, 1	000 001 010 011 100 101 110 111		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 7200bps. Sets serial port speed to 9600bps. Sets serial port speed to 12000bps. Sets serial port speed to 14400bps.
5, 4	00 01 10 11		Parity even. Not used. Parity odd. No Parity.
7, 6	00 01 10		Guard tone disabled. Guard tone 550Hz enabled. Guard tone 1800Hz enabled.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B3 &W<CR>
Default:	3
Range:	1-9
Unit:	.1 second
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 [cmds] &Un [cmds]
Example:	AT %E &U1 \K<CR>
Description:	Selects data compression.
Command	Function
&U0	Data compression disabled.
&U1	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 mode enabled, MNP only.
\N3	Auto-reliable mode enabled, MNP with fallback to Normal mode.
\N4	Reliable mode enabled, LAPM only.
\N5	Auto-reliable mode enabled, LAPM with fallback to Normal mode.
\N6	Reliable mode enabled, LAPM with fallback to MNP mode.
\N7	Auto-reliable mode enabled, LAPM with fallback to MNP then to Normal mode.

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 %M1200 %B9600 \J1<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.
%B7200	Select 7200bps maximum speed.
%B9600	Select 9600bps maximum speed.
%B12000	Select 12Kbps maximum speed.
%B14400	Select 14.4Kbps maximum speed with V.32bis option.

COMPRESSION
Type:	Configuration
Format:	AT [cmd] %Cn [cmd]
Example:	AT %C1<CR>
Description:	Selects data compression.
Command	Function
%C0	Data compression disabled.
%C1	Data compression requested, V.42bis in LAPM, MNP5 in MNP.
%C2	Data compression requested, V.42bis in LAPM, MNP5 in MNP.
%C3	Data compression requested, V.42bis in LAPM, MNP5 in MNP.

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.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] \Gn [cmds]
Example:	AT \G1 <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 \Q0 A <CR>
Description:	Sets type of flow control used by modem.
Command	Function
\Q0	Flow control disabled.
\Q1	Bidirectional XON/XOFF flow control enabled.
\Q2	Unidirectional CTS flow control to DTE enabled.
\Q3	Bidirectional RTS/CTS flow control enabled.
\Q4	Unidirectional XON/XOFF flow control enabled.
\Q5	Unidirectional CTS flow control to DTE, CTS off until CONNECT enabled.
\Q6	Bidirectional RTS/CTS flow control, CTS off until CONNECT enabled.

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 \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 %B1200<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.

MNP STREAM/BLOCK MODE
Type:	Configuration
Format:	AT [cmds] \Ln [cmds]
Example:	AT \L1 DT555-1212<CR>
Description:	Selects the transfer mode for MNP.
Command	Function
\L0	Stream mode for MNP enabled.
\L1	Block mode for MNP enabled.

NUMERIC RESULT CODES
Type:	Configuration
Format:	AT [cmds] &Nn [cmds]
Example:	AT &N0 &E<CR>
Description:	Selects the type of numeric result codes.
Command	Function
&N0	Hayes numeric result codes enabled.
&N1	Microcom numeric result codes enabled.

REPORT FIRMWARE VERSION
Type:	Immediate
Format:	AT [cmds] %V [cmds]
Example:	AT %V <CR>
Description:	Displays firmware version.

REPORT PROTOCOL
Type:	Register
Format:	AT [cmds] S27? [cmds]
Example:	AT S27? <CR>
Description:	Reports ITU-T/Bell modes.
Value	Meaning
0	CCITT mode.
64	Bell mode.

RESULT CODES
Type:	Configuration
Format:	AT [cmds] \Vn [cmds]
Example:	AT \V1 W0<CR>
Description:	Selects the type of result code format.
Command	Function
\V0	/REL connect codes not displayed, unless W1 is set.
\V1	/REL connect codes are displayed, unless W1 is set.
\V2	-LAPM, -MNP, /REL connect codes are displayed.

TEST MODES
Format		AT [cmds] S16? [cmds]
Example:		ATS16?<CR>
Default:		Read only
Range:		0-255
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.

V.42bis MAXIMUM STRING LENGTH
Type:	Register
Format:	AT [cmds] S214=n [cmds]
Example:	AT S214=250 <CR>
Default:	250
Range:	6 - 250
Unit:	Unidentified
Description:	Selects string size for V.42bis compression.

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