AT COMMAND SET ERRORS
Type:	Configuration
Format:	AT S84=n
Example:	AT S84=1 <CR>
Description:	Configures how the modem will respond to errors.
Command	Function
» S84=0	Normal operation.
S84=1	NO_ERROR mode.
S84=2	NO_STRAP_OR_ERROR mode.

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Register
Format:	AT [cmds] %An [cmds]
Example:	AT%A20<CR>
Default:	13
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
» \C0	Data is buffered.
\C1	Data is discarded.
\C2	Data is discarded, modem returns to normal mode on receiving auto-reliable fallback character.

AUTO-RETRAIN - V.32bis
Type:	Configuration
Format:	AT S76=n
Example:	AT S76=1 <CR>
Description:	Selects auto-retrain mode for V.32bis.
Command	Function
» S76=0	Auto-retrain enabled.
S76=1	Auto-retrain disabled.
S76=2	Auto-retrain enabled; speed defaults to 4800bps.
S76=3	Auto-retrain enabled; speed defaults to 9600bps.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] \Kn [cmds]
Example:	AT \K1 <CR>
Description:	Configures action of break signal.
Command	Function
\K0	Buffers cleared and break sent to remote modem, then enter command mode.
\K1	Buffers cleared and break sent to remote modem.
\K2	Send break to remote modem immediately, then enter command mode.
\K3	Send break to remote modem immediately.
\K4	Send break to remote modem with transmitted data, then enter command mode.
» \K5	Send break to remote modem with transmitted data.

CD SIGNAL
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Example:	AT &C4 &R2 &S2<CR>
Description:	Configures the behavior of the carrier detect signal.
Command	Function
&C0	CD forced high.
» &C1	CD normal.
&C2	CD forced high except during disconnecting.
&C3	CD follows DTR signal.
&C4	CD follows remote RTS signal.
&C5	CD forced low when DTR is low.

COMPRESSION
Type:	Configuration
Format:	AT %Cn
Example:	AT *EC0 %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	Direct mode enabled.
\N2	MNP mode only enabled.
\N3	MNP mode with fallback to normal mode enabled.
\N4	LAP-M mode only enabled.
\N5	LAP-M mode with fallback to normal mode enabled.
\N6	LAP-M mode with fallback to MNP enabled.
» \N7	LAP-M mode with fallback to MNP and normal modes enabled.

CTS SIGNAL
Type:	Configuration
Format:	AT [cmds] \Dn [cmds]
Example:	AT \D0<CR>
Description:	Selects the function of the CTS signal.
Command	Function
» \D0	CTS forced high.
\D1	CTS normal.
\D2	DSR normal, except forced low on disconnect.
\D3	CTS follows CD.

DISCONNECT BUFFER DELAY
Type:	Register
Format:	AT [cmds] S49=n [cmds]
Example:	AT S49=0<CR>
Default:	10
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait to disconnect if there is data in the transmit or receive buffers.

DSR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Example:	AT &C4 &R2 &S2<CR>
Description:	Selects the function of the DSR signal.
Command	Function
&S0	DSR forced high.
&S1	DSR normal.
&S2	DSR normal, except forced low on disconnect.
&S3	DSR follows DTR.
&S4	DSR normal, except signal is brought high early.
&S5	DSR forced low in command mode.

DTR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Example:	AT &D1<CR>
Description:	Configures the behavior of the Data Terminal Ready signal.
Command	Function
&D0	DTR forced high.
&D1	Modem will enter command mode on low DTR.
» &D2	Modem will disconnect on low DTR.
&D3	Modem will disconnect and reset on low DTR.
&D4	Modem will disconnect only on low DTR, regardless of remote modem.

ETC PROTOCOL
Type:	Configuration
Format:	AT [cmds] S91=n [cmds]
Example:	AT S91=0<CR>
Description:	Controls the AT&T ETC protocol.
Command	Function
» S91=0	ETC disabled.
S91=1	ETC enabled.

FACTORY DEFAULTS
Type:	Immediate
Format:	AT &Fn
Example:	AT &F8<CR>
Description:	Loads factory defaults.
Command	Function
&F0	Reloads factory configuration.
&F5	Reloads factory configuration for ETC in cellular mode.
&F6	Reloads factory configuration for ETC in switched line mode.

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 \Q5<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 disabled.
\Q3	Bidirectional CTS/RTS flow control enabled.
\Q4	Flow control by DCE disabled.
» \Q5	XON/XOFF flow control by DCE enabled.
\Q6	RTS flow control by DCE enabled.

HANG UP MODE
Type:	Configuration
Format:	AT [cmds] S85=n [cmds]
Example:	AT S85=1 O<CR>
Description:	Selects how the modem will hang up.
Command	Function
» S85=0	Set hang up mode to normal on next ATH command.
S85=1	Set hang up mode to fast on next ATH command.

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] \Tn [cmds]
Example:	AT\T20<CR>
Default:	Unidentified
Range:	0-255
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects.

LOCAL SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] %Rnnn [cmds]
Example:	AT %B9600 %R19200<CR>
Description:	Sets serial port speed.
Command	Function
%R300	Sets 300bps speed.
%R600	Sets 600bps speed.
%R1200	Sets 1200bps speed.
%R2400	Sets 2400bps speed.
%R4800	Sets 4800bps speed.
%R9600	Sets 9600bps speed.
%R12000	Sets 12Kbps speed.
%R14400	Sets 14.4Kbps speed.
%R19200	Sets 19.2Kbps speed.
%R38400	Sets 38.4Kbps speed.
%R57600	Sets 57.6Kbps speed.

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] S90=n [cmds]
Example:	AT %L3 %B14 S90=0<CR>
Description:	Sets operation of serial port speed.
Command	Function
» S90=0	Serial speed locked.
S90=1	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	MNP block size is 64 characters.
\A1	MNP block size is 128 characters.
\A2	MNP block size is 192 characters.
» \A3	MNP block size is 256 characters.
\A4	MNP block size is 32 characters.
\A5	MNP block size is 16 characters.

NEGOTIATE PROTOCOL
Type:	Configuration
Format:	AT S78=n
Example:	AT S78=1 <CR>
Description:	Configures whether the modem will attempt to negotiate protocols or if only the protocol selected in S41 will be used.
Command	Function
» S78=0	Negotiation enabled.
S78=1	Negotiation disabled.

PROTOCOL/SPEED
Type:	Immediate
Format:	AT [cmds] %Bn [cmds]
Example:	AT %B14400<CR>
Description:	Selects the current DCE speed.
Command	Function
%B300	Select 300bps speed.
%B1200	Select 1200bps speed.
%B2400	Select 2400bps speed.
%B4800	Select 4800bps speed.
%B7200	Select 7200bps speed.
%B9600	Select 9600bps speed.
%B12000	Select 12Kbps speed.
%B14400	Select 14.4Kbps speed.

PROTOCOL/SPEED
Type:	Register
Format:	AT [cmds] S41=n [cmds]
Example:	ATS41=2<CR>
Description:	Selects the current protocol and speed.
Command		Function
» S41=0		V.32bis 14.4Kbps.
S41=2		V.32bis 12Kbps.
S41=3		V.32bis or V.32 9600bps.
S41=4		V.32bis 7200bps.
S41=5		V.32bis or V.32 4800bps.
S41=6		V.22bis 2400/1200bps.
S41=7		V.22 1200bps.
S41=8		Bell 212A 1200bps.
S41=10		V.21 300bps.
S41=11		Bell 103A 300bps.
S41=12		V.23 1200/75bps.
S41=13		V.23 75/1200bps.

REDIAL
Type:	Immediate
Format:	AT [cmds] DL
Example:	AT M1 DL<CR>
Description:	Redials the last number dialed.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Example:	AT I3 &V1 %V<CR>
Description:	Displays modem properties.
Command	Function
I0	Reports product code.
I1	Reports firmware version in short form.
I2	Reports firmware checksum result.
I3	Reports serial number.
I4	Reports modem number.
I5	Reports hardware part number.
I6	Reports software part number.
I9	Reports firmware part number.
I11	Reports ROM checksum result.
I17	Reports reason for last error.
I19	Reports firmware version in long form.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] &Vn [cmds]
Example:	AT I3 &V18 <CR>
Description:	Reports configuration profiles, stored numbers, and other information. If an option is preceded by 1, the report will be displayed repeatedly until a key is pressed.
Command	Function
&V0	Report current configuration.
&V1	Report active configuration profile.
&V2	Display profile 0.
&V3	Display profile 1.
&V4	Display the first two stored numbers.
&V8	Report connection status and internal modem information.

REPORT INFORMATION - CHANGE MODEM SPEED
Type:	I10=mmediate
Format:	AT [cmds] I10=n [cmds]
Example:	AT I10=3 &V1 %V<CR>
Description:	Changes the value reported by I0.
Command	Function
I10=0	I0 will report 144 (14.4Kbps).
I10=1	I0 will report 240 (2400bps).
I10=2	I0 will report 480 (4800bps).
I10=3	I0 will report 960 (9600bps).
I10=4	I0 will report 120 (1200bps).

RESULT CODE FORMAT
Type:	Immediate
Format:	AT [cmds] Vn [cmds]
Example:	AT V1<CR>
Description:	Selects which type of result codes will be displayed.
Command	Function
V0	Display standard numeric result codes.
» V1	Display verbose result codes.
V2	Display AT&T numeric result codes.

RTS SIGNAL
Type:	Configuration
Format:	AT [cmds] &Rn [cmds]
Example:	AT &C4 &R2 &S2<CR>
Description:	Configures the behavior of the Ready to Send signal.
Command	Function
&R0	RTS normal.
&R1	RTS forced high.
» &R2	RTS follows remote CD signal.

SWITCHED LINE TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Example:	AT &I15<CR>
Default:	9
Range:	10 - 25
Unit:	-1 dBm
Description:	Sets the signal level for transmission when in switched line mode.

V.17 MODULATION
Type:	Configuration
Format:	AT S79=n
Example:	AT S79=1 <CR>
Description:	Selects whether V.17 can be used for fax modulation.
Command	Function
» S79=0	V.17 enabled.
S79=1	V.17 disabled.

V.32 HANDSHAKE OPTIONS
Type:	Configuration
Format:	AT [cmds] S43=n [cmds]
Example:	AT S43=0<CR>
Description:	Shortens V.32 and V.32bis handshake time.
Command	Function
» S43=0	Normal handshake sequence.
S43=1	Training time is shortened by 2 seconds in V.32 and V.32bis modes.

V.42 WINDOW SIZE
Type:	Configuration
Format:	AT S89=n
Example:	AT S89=1 <CR>
Description:	Sets the size of the window for V.42 mode.
Command	Function
» S89=0	V.42 window set to 6 frames.
S89=1	V.42 window set to 7 frames.
S89=2	V.42 window set to 8 frames.
S89=3	V.42 window set to 9 frames.
S89=4	V.42 window set to 10 frames.
S89=5	V.42 window set to 11 frames.
S89=6	V.42 window set to 12 frames.
S89=7	V.42 window set to 13 frames.
S89=8	V.42 window set to 14 frames.
S89=9	V.42 window set to 15 frames.

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.