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

AUTO FALL FORWARD/FALLBACK
Type:	Configuration
Format:	AT [cmds] %Gn [cmds]
Example:	AT %G1 &W <CR>
Description:	Selects auto fallback.
Command	Function
%G1	Fallback enabled.
» %G0	Fallback disabled.

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Configuration
Format:	AT [cmds] %An [cmds]
Example:	AT %A20 <CR>
Range:	0-127
Unit	ASCII
Description:	Sets the character used as the auto-reliable fallback character.

AUTO-RETRAIN
Type:	Configuration
Format:	AT %En
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=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=4<CR>
Default:		4
Range:		0 - 253
Unit:		Read only
Description:		Displays jack type, CTS signal, low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function.
Bit	Value		Function
0	» 0 1		RJ-11 jack selected. RJ-12 or RJ-13 jack selected.
1	0		Not used.
2	0 » 1		CTS forced high. CTS follows RTS.
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. 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	000 100 101 110 » 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=177<CR>
Default:		55
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 01 10 » 11		Parity even. Not used. Parity odd. 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=9 <CR>
Default:		73
Range:		0 - 127
Unit:		Bit-mapped
Description:		Selects sync/async mode, Line type, internal clock, and ITU-T/Bell modes.
Bit	Value		Function
3, 1, 0	» 000 001 010 011 100 » 101 110		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. Hayes AutoSync™ mode - serial port locked at 9600bps. Error correction mode. Buffered asynchronous mode.
2	» 0 1		Dial up line. Leased line.
5, 4	» 00 01 10		Internal DTE transmit clock source. External DTE transmit clock source. Slave DTE transmit clock source.
6	0 » 1		CCITT mode. Bell mode.

BIT-MAPPED REGISTER S28
Format		AT [cmds] S28=n [cmds]
Example:		AT S28=8 <CR>
Default:		0
Range:		0 - 31
Unit:		Bit-mapped
Description:		Controls V.23 split speed, V.23 split screen, V.23 half duplex, and pulse dialing.
Bit	Value		Function
0	» 0 1		V.23 split speed operation disabled. V.23 split speed operation enabled.
1	» 0 1		Select 75bps transmit, 1200bps receive. Select 1200bps transmit, 75bps receive.
2	» 0 1		1200bps transmit , 1200bps receive disabled. 1200bps transmit , 1200bps receive enabled.
4, 3	» 00 01 10 11		39ms make/61ms break at 10pps. 33ms make/67ms break at 10pps. 39ms make/61ms break at 20pps. 33ms make/67ms break at 20pps.

BIT-MAPPED REGISTER S31
Format		AT [cmds] S31=n [cmds]
Example:		ATS31=40<CR>
Default:		2
Range:		0-255
Unit:		Bit-mapped
Description:		Controls auto-baud function and result codes.
Bit	Value		Function
0	0		Not used.
1	0 » 1		Auto-baud disabled. Auto-baud enabled.
3, 2	» 00 01 10		DTE speed displayed in result codes. Extended result codes enabled; DCE speed displayed in result codes. DCE speed displayed in result codes.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] \Kn [cmds]
Example:	AT \K1 <CR>
Description:	Configures action of break signal.
Command		Break from DTE while in Data mode	Break from DTE while in Command mode	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.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B3 &W<CR>
Range:	1-9
Default	3
Unit:	.1 second
Description:	Sends break to modem.

CALLING TONE
Type:	Configuration
Format:	AT [cmds] -Cn [cmds]
Example:	AT -C0 &W<CR>
Description:	Controls whether the DTE will allow the modem to send a 1300Hz calling tone when originating.
Command	Function
-C0	Disable calling tone.
-C1	Enable calling tone.

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 for parallel interface operation. Direct mode enabled for serial interface.
\N2	Reliable mode enabled.
\N3	Auto-reliable mode enabled.
\N4	LAPM mode enabled.
\N5	MNP mode enabled.

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

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] \Vn [cmds]
Example:	AT \V1 %C1<CR>
Description:	Selects extended result codes.
Command	Function
\V0	Result codes specified by Vn enabled.
\V1	Extended MNP result codes enabled.
\V2	Extended V.42 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 \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.

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] S90=n [cmds]
Example:	ATS90=20<CR>
Default:	0
Range:	0-255
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects. S90=0 will disable.

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.

LINE SIGNAL QUALITY
Type:	Immediate
Format:	AT [cmds] %Q [cmds]
Example:	AT %Q &W<CR>
Description:	Displays line signal quality.

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] \Jn [cmds]
Example:	AT %L3 \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 &MB28800<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.

NORMAL MODE
Type:	Immediate
Format:	AT [cmds] \Z [cmds]
Example:	AT \Z <CR>
Description:	Ends reliable mode link, initiate return to normal mode.

ON-LINE IN RELIABLE MODE
Type:	Immediate
Format:	AT [cmds] \O
Example:	AT \O <CR>
Description:	Modem attempts MNP connection in normal 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 disabled. Local analog loopback enabled.
1	0		Not used.
2	» 0 1		Local digital loopback disabled. Local digital loopback enabled.
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 disabled. Remote digital loopback w/ self-test enabled.
6	» 0 1		Local analog loopback w/ self-test disabled. Local analog loopback w/ self-test enabled.

V.42 DETECTION PHASE
Type:	Configuration
Format:	AT [cmds] -Jn [cmds]
Example:	AT -J1 &W<CR>
Description:	Controls V.42 detection.
Command	Function
-J0	V.42 detection disabled.
-J1	V.42 detection enabled.

V.42bis COMPRESSION CONTROL
Type:	Configuration
Format:	AT [cmds] "Hn [cmds]
Example:	AT "H3 &W<CR>
Description:	Controls V.42bis data compression
Command	Function
"H0	V.42bis disabled.
"H1	V.42bis when transmitting enabled.
"H2	V.42bis when receiving enabled.
"H3	V.42bis when transmitting/receiving enabled.

V.42bis MAXIMUM STRING LENGTH
Type:	Immediate
Format:	AT [cmds] "On [cmds]
Example:	AT "O32 <CR>
Default:	32
Range:	6 - 64
Unit:	unidentified.
Description:	Selects string size for V.42bis compression.

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.

CALL REQUESTED NUMBER
Type:	Immediate
Format:	CRI<#>;xxxx
Example:	CRI1-303 555-1212;irisbean<CR>
Description:	Same as CRN. Dials the number given. It will ignore spaces and hyphens in the string. If the string is more than fifty characters long, a result of INV will be returned and the identification string xxxx will be ignored.

PROGRAM IDENTIFICATION
Type:	Configuration
Format:	PRI
Example:	PRI <CR>
Description:	Modem returns VAL.

REQUEST LISTED NUMBERS
Type:	Immediate
Format:	RLNn <CR>
Example:	RLN6<CR>
Range:	0-19
Unit:	Memory location
Description:	Display dial string stored at memory address n. If n not specified, all dial strings are displayed