ACCEPT RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \U
Example:	AT \U<CR>
Description:	Accepts remote modem’s request for reliable link.

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14=n [cmds]
Example:		ATS14=170<CR>
Default:		170
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		Command recognition 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=n [cmds]
Example:		ATS21=0<CR>
Default:		0
Range:		0 - 184
Unit:		Bit-mapped
Description:		Selects jack type, low DTR action, DCD signal, and the Long Space Disconnect function.
Bit	Value		Function
0	» 0		Selects RJ-11
2, 1	0		Not used.
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 S27
Format		AT [cmds] S27=n [cmds]
Example:		AT S27=64 <CR>
Default:		64
Range:		0 - 115
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.
3, 2	0		Not used.
5, 4	» 00 01 10 11		Internal DCE transmit clock source. External DTE transmit clock source. Remote DCE transmit clock source. Internal DCE transmit clock source.
6	0 » 1		CCITT mode. Bell mode.

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	Function
\K0	Online command mode enabled, send no break to remote modem.
\K1	Break sent to remote modem and buffered cleared.
\K2	Online command mode enabled, send no break to remote modem.
\K3	Send break to remote modem immediately.
\K4	Break sent to remote modem and buffered cleared.
» \K5	Send break with transmitted data.

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 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	Direct mode enabled.
\N2	Reliable mode enabled.
» \N3	Auto-reliable mode enabled.

CONVERT TO RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \Y [cmds]
Example:	AT \Y<CR>
Description:	Initiates reliable mode link.

DISPLAY CURRENT COMMAND STATUS
Type:	Immediate
Format:	AT [cmds] \S [cmds]
Example:	AT &Z2=9W1-303-555-1212 \S<CR>
Description:	Displays current setting of modem commands.

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	Extended 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 TYPE
Type:	Configuration
Format:	AT [cmds] \Qn [cmds]
Example:	AT \Q3<CR>
Description:	Sets type of flow control used by modem.
Command	Function
\Q0	Flow control disabled.
\Q1	Bidirectional XON/XOFF flow control enabled.
» \Q2	CTS flow control by DCE enabled.
\Q3	Bidirectional CTS/RTS flow control enabled.
\Q4	XON/XOFF flow control by DCE 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 %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 \N1<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.

ON-LINE IN RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \O
Example:	AT \O <CR>
Description:	Returns to on-line and requests reliable mode connection.

SWITCH TO MNP MODE
Type:	Immediate
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:		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.

XON/XOFF PASS-THROUGH
Type:	Configuration
Format:	AT [cmds] \Xn [cmds]
Example:	AT \X0 \U <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.