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V.3400

MOTOROLA, INC.

V.3400

Modem Type	Data (synchronous/asynchronous)/Fax
Maximum Data Rate	28.8Kbps
Maximum Fax Rate	14.4Kbps
Data Bus	External
Fax Class	Class I
Data Modulation Protocol	Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.32, V.32bis, V.33, V.34
Fax Modulation Protocol	ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression	MNP5, V.42, V.42bis

CONNECTIONS
Purpose	Location	Purpose	Location
YES button	BT1	Leased line out	CN2
NO button	BT2	RS-232/422	CN3
TALK/DATA button	BT3	Fuse	FUSE
Switched line out	CN1	Power switch	SW1

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
TR	Red	On	DTR signal is high
TR	Red	Off	DTR signal is low
CS	Red	On	CTS signal is high
CS	Red	Off	CTS signal is low
RS	Red	On	RTS signal is high
RS	Red	Off	RTS signal is low
CD	Red	On	Carrier signal detected
CD	Red	Off	Carrier signal not detected
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
TD	Red	On	Modem is transmitting data
TD	Red	Off	Modem is not transmitting data

Proprietary AT Command Set

ANSWER/ORIGINATE MODE
Type:	Configuration
Format:	AT [cmds] *ORn [cmds]
Example:	AT *OR0<CR>
Description:	Selects whether the modem is in answer or originate mode.
Command	Function
� *OR0	Modem is in originate mode.
*OR1	Modem is in answer mode.

AUTO-ANSWER OVERRIDE
Type:	Immediate
Format:	AT [cmds] *IC [cmds]
Example:	AT *IC<CR>
Description:	Instructs the modem to ignore the incoming call, if the modem is set to automatically answer.

AUTODIALING STORED NUMBER
Type:	Configuration
Format:	AT [cmds] *AUn [cmds]
Example:	AT AU4 CN4,1(303)443-3388<CR>
Description:	Sets the autodialing function to dial the number stored in memory location n.

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Register
Format:	AT [cmds] %An [cmds]
Example:	AT%A20<CR>
Default:	19
Range:	0-127
Unit:	ASCII
Description:	Sets the character used as the auto-reliable fallback character. %A0 will disable this function.

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Register
Format:	AT [cmds] S64=n [cmds]
Example:	ATS64=20<CR>
Range:	0-127
Unit:	ASCII
Description:	Sets the character used as the auto-reliable fallback character. S64=0 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 discarded.
\C1	Data is buffered.

AUTO-RETRAIN
Type:	Configuration
Format:	AT %En
Example:	AT %E1 *MM12<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=40<CR>
Default:		138
Range:		0 - 190
Unit:		Bit-mapped
Description:		Controls command echo, result codes, dialing mode, and answer/originate mode.
Bit	Value		Function
0	0		Not used.
1	0 � 1		Command echo off. Command echo on.
2	� 0 1		Result codes enabled. Result codes disabled.
3	0 � 1		Numeric result codes. Verbose result codes.
4	� 1		Not used.
5	� 0 1		Tone dialing selected. Pulse dialing selected.
6	0		Not used.
7	0 � 1		Answer mode selected. Originate mode selected.

BIT-MAPPED REGISTER S21
Format		AT [cmds] S21=n [cmds]
Example:		ATS21=1<CR>
Default:		132
Range:		0 - 255
Unit:		Bit-mapped
Description:		Controls low DTR action, DCD signal, and the Long Space Disconnect function.
Note:		Be aware that the bits are out of order.
Bit	Value		Function
6, 0	� 00 01 10 11		DSR forced high. DSR normal, except forced low on disconnect. DSR normal. DSR follows OH.
5, 1	� 00 01 10 11		CD forced high. CD forced high except during disconnect. CD normal. CD follows remote RTS signal.
2	0 � 1		CTS normal. 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. Modem resets on low DTR.
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=114<CR>
Default:		70
Range:		0 - 255
Unit:		Bit-mapped
Description:		Controls volume and speaker settings, result codes, and make/break pulse ratio.
Bit	Value		Function
1, 0	00 01 � 10 11		Lowest volume setting. Low volume setting. Medium volume setting Highest volume setting.
3, 2	00 � 01 10 11		Speaker disabled. Speaker enabled until carrier signal detected Speaker enabled. Speaker enabled following dialing, then disabled after carrier signal detected.
6, 5 ,4	000 001 010 011 � 100		Busy and dialtone detection disabled, result codes 0-4 enabled. Busy and dialtone detection disabled, result codes 0-5, 10 enabled. Busy tone detection disabled, dialtone detection enabled, result codes 0-6, 10 enabled. Busy tone detection enabled, dialtone detection disabled, result codes 0-5, 7, 10 enabled. Busy and dialtone detection enabled, result codes 0-7, 10 enabled.
7	� 0 1		Pulse dialing at 39/61ms at 10pps. Pulse dialing at 33/67ms at 10pps.

BIT-MAPPED REGISTER S23
Format		AT [cmds] S23=n [cmds]
Example:		ATS23=177<CR>
Default:		1
Range:		0 - 129
Unit:		Bit-mapped
Description:		Grants/denies remote digital loopback and sets guard tone.
Bit	Value		Function
0	0 � 1		Remote digital loopback denied. Remote digital loopback allowed.
1	0		Not used.
2	0		Not used.
3	0		Not used.
4	0		Not used.
5	0		Not used.
7, 6	� 00 01 10		Guard tone disabled. Guard tone at 500Hz enabled. Guard tone at 1800Hz enabled.

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27=n [cmds]
Example:		ATS27=9<CR>
Default:		9
Range:		0 - 127
Unit:		Bit-mapped
Description:		Selects sync/async mode, line type, clock source, and ITU-T/Bell modes.
Bit	Value		Function
1, 0	00 01 � 10 11		Asynchronous command and data modes. Asynchronous command, synchronous connect mode. DTR dialing enabled, synchronous connect mode. Manual dialing only, synchronous connect mode.
2	� 0 1		Switched line. Leased line.
3	0		Not used.
5, 4	� 00 01 10		Internal DTE transmit clock source. External DTE transmit clock source. Slave DTE transmit clock source.
6	� 0 1		DTR dialing enabled. DTR dialing disabled.

BIT-MAPPED REGISTER S29
Format		AT [cmds] S29=n [cmds]
Example:		ATS29=4<CR>
Default:		0
Range:		0 - 135
Unit:		Bit-mapped
Description:		Controls command set, option retaining, V.32 fast handshaking, and DTE fallback.
Bit	Value		Function
0	� 0 1		AT command set enabled. AT command set disabled.
1	� 0 1		Modem will not reset on disconnect. Modem will reset on disconnect.
2	� 0 1		Normal V.32 handshake sequence. Training time is shortened by 2 seconds in V.32 and V.32bis modes.
3	0		Not used.
4	0		Not used.
5	0		Not used.
6	0		Not used.
7	� 0 1		DTR dialing enabled. DTR dialing disabled.

BIT-MAPPED REGISTER S32
Format		AT [cmds] S32=n [cmds]
Example:		ATS32=14<CR>
Default:		6
Range:		0 - 15
Unit:		Bit-mapped
Description:		Controls line type, disconnect on loss of current, and leased line backup mode.
Bit	Value		Function
0	� 0 1		2-wire leased line. 4-wire leased line.
2, 1	00 01 � 11		Do not disconnect on loss of current. Disconnect after 8ms if current is lost. Disconnect after 90ms if current is lost.
3	� 0 1		Modem will restore leased line connection only when modem receives LB or LD. Modem will restore leased line connection automatically.

BIT-MAPPED REGISTER S60
Format		AT [cmds] S60=n [cmds]
Example:		ATS60=4<CR>
Default:		67
Range:		0 - 199
Unit:		Bit-mapped
Description:		Controls auto-retrain, MNP, auto-reliable time buffering, RI signal, and extended result codes.
Bit	Value		Function
0	0 � 1		Auto-retrain disabled. Auto-retrain enabled.
1	0 � 1		MNP disabled. MNP enabled.
2	� 0 1		Data is discarded during auto-relaible time. Data is buffered during auto-relaible time.
5 - 3	0		Not used.
6	0 � 1		RI signal high during rings, and forced high for duration of call. RI signal high during rings only.
7	� 0 1		Extended result codes disabled. Extended result codes enabled.

BIT-MAPPED REGISTER S70
Format		AT [cmds] S70=n [cmds]
Example:		ATS70=7<CR>
Default:		15
Range:		0 - 15
Unit:		Bit-mapped
Description:		Controls connect mode and V.42 negotiation mode.
Bit	Value		Function
2, 1, 0	000 001 010 011 100 101 110 � 111		Normal mode enabled. Direct mode enabled. MNP mode only enabled. MNP mode with fallback to normal mode enabled. LAP-M mode only enabled. LAP-M mode with fallback to normal mode enabled. LAP-M mode with fallback to MNP enabled. LAP-M mode with fallback to MNP and normal modes enabled.
3	0 � 1		Normal V.42 handshaking enabled. Fast V.42 handshaking enabled.

BIT-MAPPED REGISTER S72
Format		AT [cmds] S72=n [cmds]
Example:		ATS72=7<CR>
Default:		0
Range:		0 - 137
Unit:		Bit-mapped
Description:		Controls serial port lock, CTS signal, and autocallback function.
Bit	Value		Function
0	� 0 1		Serial speed locked. Serial speed follows connect speed.
2 - 1	0		Not used.
3	� 0 1		CTS normal. CTS follows CD.
6 - 4	0		Not used.
7	� 0 1		Autocallback disabled. Autocallback enabled. The modem, upon detecting an incoming call, will dial the default number and connect with it instead of the incoming call.

BIT-MAPPED REGISTER S84
Format		AT [cmds] S84=n [cmds]
Example:		ATS84=7<CR>
Default:		0
Range:		0 - 93
Unit:		Bit-mapped
Description:		Controls disconnect during handshaking, V.22 fallback, answerback, dial backup trigger, and frame tracking.
Bit	Value		Function
0	� 0 1		Disconnect if key is pressed during handshaking. Do not disconnect if key is pressed during handshaking.
1	0		Not used.
2	� 0 1		Normal fallback to V.22. Fast fallback to V.22.
3	� 0 1		Normal answerback. Fast answerback.
4	� 0 1		DTR signal must go from low to high four times for dial backup to occur. DTR signal must go from low to high once for dial backup to occur.
5	0		Not used.
6	� 0 1		Frame tracking disabled. Frame tracking enabled.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B50 O<CR>
Default:	35
Range:	1-255
Unit:	20ms
Description:	Sends break to modem.

BREAK LENGTH
Type:	Register
Format:	AT [cmds] S79=n [cmds]
Example:	ATS79=20<CR>
Default:	35
Range:	0 - 255
Unit:	20 ms
Description:	Sets the length of breaks sent from DCE to DTE.

BREAK TYPE
Type:		Configuration
Format:		AT [cmds] \Kn [cmds]
Example:		AT \K1 <CR>
Description:		Configures action of break signal.
Command	Break from DTE Reliable/Normal mode		Break from DTE Direct mode	Modem receives \B	Break from remote modem
\K0	Enter command mode, do not send break to remote modem.		Send break to remote modem immediately, then enter command mode.	Buffers cleared and break sent to remote modem.	Buffers cleared and break sent to DTE.
\K1	Buffers cleared and break sent to remote modem.		Send break to remote modem immediately.	Buffers cleared and break sent to remote modem.	Buffers cleared and break sent to DTE.
\K2	Enter command mode, do not send break to remote modem.		Send break to remote modem immediately, then enter command mode.	Send break to remote modem immediately.	Send break to DTE immediately.
\K3	Send break to remote modem immediately.		Send break to remote modem immediately.	Send break to remote modem immediately.	Send break to DTE immediately.
\K4	Enter command mode, do not send break to remote modem.		Send break to remote modem immediately, then enter command mode.	Send break to remote modem with transmitted data.	Break sent with received data to the DTE.
� \K5	Send break with transmitted data.		Send break to remote modem immediately.	Send break to remote modem with transmitted data.	Break sent with received data to the DTE.

BREAK TYPE
Type:		Register
Format:		AT [cmds] S59=n [cmds]
Example:		AT S59=1 <CR>
Description:		Configures action of break signal.
Command	Break from DTE Reliable/Normal mode		Break from DTE Direct mode	Modem receives \B	Break from remote modem
S59=0	Enter command mode, do not send break to remote modem.		Send break to remote modem immediately, then enter command mode.	Buffers cleared and break sent to remote modem.	Buffers cleared and break sent to DTE.
S59=1	Buffers cleared and break sent to remote modem.		Send break to remote modem immediately.	Buffers cleared and break sent to remote modem.	Buffers cleared and break sent to DTE.
S59=2	Enter command mode, do not send break to remote modem.		Send break to remote modem immediately, then enter command mode.	Send break to remote modem immediately.	Send break to DTE immediately.
S59=3	Send break to remote modem immediately.		Send break to remote modem immediately.	Send break to remote modem immediately.	Send break to DTE immediately.
S59=4	Enter command mode, do not send break to remote modem.		Send break to remote modem immediately, then enter command mode.	Send break to remote modem with transmitted data.	Break sent with received data to the DTE.
� S59=5	Send break with transmitted data.		Send break to remote modem immediately.	Send break to remote modem with transmitted data.	Break sent with received data to the DTE.

CD SIGNAL
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Example:	AT &C3 RS1 SR1<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 disconnect.
&C3	CD follows remote RTS signal.

CHARACTER LENGTH AND PARITY
Format		AT [cmds] S61? [cmds]
Example:		ATS61?<CR>
Default:		Read-only
Range:		0 - 56
Unit:		Bit-mapped
Description:		Reports current character length and parity.
Bit	Value		Meaning
2 - 0	0		Not used.
3	0 � 1		7 bit character length set. 8 bit character length set.
5, 4	� 00 01 10 11		MARK parity. No parity. Odd parity. Even parity.

COMMAND SET
Type:	Configuration
Format:	AT [cmds] *NTn [cmds]
Example:	AT *NT0<CR>
Description:	Disables the AT command set.
Note:	To re-enable the command set, power down the modem and then cycle power seven times. The modem must remain powered on each time at least one second but not more than five.
Command	Function
� *NT0	Command set disabled.
*NT1	Command set enabled.

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Example:	AT &M2 H1 DT555-1212<CR>
Description:	Selects the active communications mode.
Command	Function
� &M0	Asynchronous command and data modes.
&M1	Asynchronous command, synchronous connect mode.
&M2	DTR dialing enabled, synchronous connect mode.
&M3	Manual dialing only, synchronous connect mode.
&M4	V.25bis bisynchronous command, synchronous connect mode.
&M5	V.25bis SDLC command, synchronous connect mode.
&M6	V.25bis asynchronous command, synchronous connect mode.

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.
%C2	Data compression enabled on transmit only.
%C3	Data compression enabled on receive only.

COMPRESSION
Type:	Register
Format:	AT S56=n
Example:	AT EC0 S56=1* *AP0<CR>
Description:	Selects data compression.
Command	Function
S56=0	Data compression disabled.
S56=1	Data compression enabled on transmit only.
S56=2	Data compression enabled on receive only.
� S56=3	Data compression enabled.

COMPRESSION AND ERROR CORRECTION - CURRENT
Type:	Register
Format:	AT [cmds] S71? [cmds]
Example:	AT S71?<CR>
Default:	Read-only
Description:	Reports current compression and error correction protocols.
Value	Meaning
0	No compression or error correction protocols active.
1	Negotiation in progress.
2	MNP2 active.
3	MNP3 active.
4	MNP4 active.
5	MNP5 active.
6	V.42 active.
7	V.42bis active.

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.

CONNECTION SPEED - CURRENT
Type:	Register
Format:	AT [cmds] S67? [cmds]
Example:	AT S67?<CR>
Default:	Read-only
Description:	Reports current connection speed.
Value	Meaning
1	300bps current speed.
3	1200bps current speed.
4	2400bps current speed.
5	4800bps current speed.
6	7200bps current speed.
7	9600bps uncoded current speed.
8	9600bps current speed.
9	12Kbps current speed.
10	14.4Kbps current speed.
11	16.8Kbps current speed.
12	19.2Kbps current speed.
13	21.6Kbps current speed.
14	24Kbps current speed.
15	26.4Kbps current speed.
16	28.8Kbps current speed.

CONNECTION SPEED LOWER LIMIT
Type:	Configuration
Format:	AT [cmds] %Ln [cmds]
Example:	AT %L3 %B14 \J0<CR>
Description:	Sets slowest allowed connection speed.
Command	Function
� %L0	No minimum speed.
%L2	Select 1200bps minimum speed.
%L3	Select 2400bps minimum speed.
%L4	Select 4800bps minimum speed.
%L5	Select 9600bps uncoded minimum speed.
%L6	Select 9600bps minimum speed.
%L7	Select 7200bps minimum speed.
%L8	Select 12Kbps minimum speed.
%L9	Select 14.4Kbps minimum speed.
%L11	Select 16.8Kbps minimum speed.
%L12	Select 19.2Kbps minimum speed.
%L13	Select 21.6Kbps minimum speed.
%L14	Select 24Kbps minimum speed.
%L15	Select 26.4Kbps minimum speed.
%L16	Select 28.8Kbps minimum speed.

CONNECTION SPEED LOWER LIMIT
Type:	Configuration
Format:	AT [cmds] S81=n [cmds]
Example:	AT %L3 S81=14 \J0<CR>
Description:	Sets slowest allowed connection speed.
Command	Function
S81=0	No minimum speed.
S81=3	Select 1200bps minimum speed.
S81=4	Select 2400bps minimum speed.
S81=5	Select 4800bps minimum speed.
S81=6	Select 7200bps minimum speed.
S81=7	Select 9600bps uncoded minimum speed.
S81=8	Select 9600bps minimum speed.
S81=9	Select 12Kbps minimum speed.
S81=10	Select 14.4Kbps minimum speed.
S81=11	Select 16.8Kbps minimum speed.
S81=12	Select 19.2Kbps minimum speed.
S81=13	Select 21.6Kbps minimum speed.
S81=14	Select 24Kbps minimum speed.
S81=15	Select 26.4Kbps minimum speed.
S81=16	Select 28.8Kbps minimum speed.

CONNECTION SPEED UPPER LIMIT
Type:	Configuration
Format:	AT [cmds] %Bn [cmds]
Example:	AT %L3 %B14 \J0<CR>
Description:	Sets fastest allowed connection speed.
Command	Function
%B0	Follow serial port speed.
%B1	Select 300bps maximum speed.
%B2	Select 1200bps maximum speed.
%B3	Select 2400bps maximum speed.
%B4	Select 4800bps maximum speed.
%B5	Select 9600bps uncoded maximum speed.
%B6	Select 9600bps maximum speed.
%B7	Select 7200bps maximum speed.
%B8	Select 12Kbps maximum speed.
� %B9	Select 14.4Kbps maximum speed.
%B11	Select 16.8Kbps maximum speed.
%B12	Select 19.2Kbps maximum speed.
%B13	Select 21.6Kbps maximum speed.
%B14	Select 24Kbps maximum speed.
%B15	Select 26.4Kbps maximum speed.
%B16	Select 28.8Kbps maximum speed.

CONNECTION SPEED UPPER LIMIT
Type:	Configuration
Format:	AT [cmds] S69=n [cmds]
Example:	AT %L3 S69=14 \J0<CR>
Description:	Sets fastest allowed connection speed.
Command	Function
S69=0	Follow serial port speed.
S69=1	Select 300bps maximum speed.
S69=3	Select 1200bps maximum speed.
S69=4	Select 2400bps maximum speed.
S69=5	Select 4800bps maximum speed.
S69=6	Select 7200bps maximum speed.
S69=7	Select 9600bps uncoded maximum speed.
S69=8	Select 9600bps maximum speed.
S69=9	Select 12Kbps maximum speed.
� S69=10	Select 14.4Kbps maximum speed.
S69=11	Select 16.8Kbps maximum speed.
S69=12	Select 19.2Kbps maximum speed.
S69=13	Select 21.6Kbps maximum speed.
S69=14	Select 24Kbps maximum speed.
S69=15	Select 26.4Kbps maximum speed.
S69=16	Select 28.8Kbps maximum speed.

CTS SIGNAL
Type:	Configuration
Format:	AT [cmds] &Rn [cmds]
Example:	AT &R0<CR>
Description:	Selects the function of the CTS signal.
Command	Function
&R0	CTS normal.
� &R1	CTS forced high.
&R2	CTS follows CD.
&R9	CTS follows RTS.

DISCONNECT BUFFER DELAY
Type:	Configuration
Format:	AT [cmds] %Dn [cmds]
Example:	AT %D0<CR>
Default:	0
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.

DISCONNECT BUFFER DELAY
Type:	Register
Format:	AT [cmds] S62=n [cmds]
Example:	AT S62=0<CR>
Default:	0
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.

DISCONNECT ON LOSS OF CURRENT
Type:	Configuration
Format:	AT [cmds] *LCn [cmds]
Example:	AT*LC0<CR>
Description:	Causes the modem to disconnect if the telephone line�s current drops.
Command	Function
*LC0	Do not disconnect on loss of current.
*LC1	Disconnect after 8ms if current is lost.
� *LC2	Disconnect after 90ms if current is lost.

DISCONNECT RESET
Type:	Configuration
Format:	AT [cmds] *ROn [cmds]
Example:	AT*RO0<CR>
Description:	Selects whether the modem will reset on disconnect.
Command	Function
� *RO0	Modem will not reset on disconnect.
*RO1	Modem will reset on disconnect.

DISPLAY STORED NUMBERS
Type:	Immediate
Format:	AT [cmds] *ND [cmds]
Example:	ATCN3,555-1212 ND<CR>
Description:	Displays all stored phone numbers.

DSR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Example:	AT &S0<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 OH.

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.

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] S82=n [cmds]
Example:	AT %L3 S82=4 \J0<CR>
Description:	Selects extended result codes.
Command	Function
� S82=0	Display DTE rate; extended result codes disabled.
S82=4	Display DCE rate; extended result codes enabled.
S82=8	Display DCE rate; extended result codes disabled.

FACTORY DEFAULTS
Type:	Immediate
Format:	AT &Fn
Example:	AT &F8<CR>
Default:	1
Range:	1-9
Description:	Loads factory defaults set n.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] \Gn [cmds]
Example:	AT G1 &M0<CR>
Description:	Selects modem port flow control.
Command	Function
� \G0	Flow control disabled.
\G1	Flow control enabled.

FLOW CONTROL CHARACTER - XOFF FROM TERMINAL
Type:	Register
Format:	AT [cmds] S45=n [cmds]
Example:	ATS45=22<CR>
Default:	19
Range:	0-127
Unit:	ASCII
Description:	Sets the character the terminal sends to represent XOFF.

FLOW CONTROL CHARACTER - XON FROM TERMINAL
Type:	Register
Format:	AT [cmds] S44=n [cmds]
Example:	ATS44=20<CR>
Default:	17
Range:	0-127
Unit:	ASCII
Description:	Sets the character the terminal sends to represent XON.

FLOW CONTROL CHARACTER - XOFF TO TERMINAL
Type:	Register
Format:	AT [cmds] S50=n [cmds]
Example:	ATS50=23<CR>
Default:	19
Range:	0-127
Unit:	ASCII
Description:	Sets the character the modem sends to represent XOFF.

FLOW CONTROL CHARACTER - XON TO TERMINAL
Type:	Register
Format:	AT [cmds] S49=n [cmds]
Example:	ATS49=21<CR>
Default:	17
Range:	0-127
Unit:	ASCII
Description:	Sets the character the modem sends to represent XON.

FLOW CONTROL MODE
Format		AT [cmds] S54=n [cmds]
Example:		ATS54=35<CR>
Default:		33
Range:		0 - 123
Unit:		Bit-mapped
Description:		Controls flow control type and pass-through.
Bit	Value		Function
1, 0	00 � 01 10 11		Flow control disabled. Bidirectional XON/XOFF flow control enabled. CTS flow control by DCE enabled. Bidirectional CTS/RTS flow control enabled.
2	0		Not used.
3	� 0 1		Flow control disabled. Flow control enabled.
4	� 0 1		XON/XOFF signals trapped by local modem. XON/XOFF passed through local modem.
6, 5	00 � 01 10 11		Flow control by DCE disabled. XON/XOFF flow control by DCE enabled. RTS flow control by DCE enabled. RTS flow control by DCE 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 enabled.
\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.
\Q7	RTS flow control by DCE enabled.

FORCE RETRAIN
Type:	Immediate
Format:	AT [cmds] *RRn [cmds]
Example:	AT *RR14 O<CR>
Description:	Forces the modem to attempt to retrain to the selected speed.
Command	Function
*RR0	Attempt 2400bps speed.
*RR1	Attempt 4800bps speed.
*RR2	Attempt 7200bps speed.
*RR3	Attempt 9600bps speed.
*RR4	Attempt 12Kbps speed.
*RR5	Attempt 14.4Kbps speed.
*RR6	Attempt 16.8Kbps speed.
*RR7	Attempt 19.2Kbps speed.
*RR8	Attempt 21.6Kbps speed.
*RR9	Attempt 24Kbps speed.
*RR10	Attempt 26.4Kbps speed.
*RR11	Attempt 28.8Kbps speed.

HANG UP MODE
Type:	Configuration
Format:	AT [cmds] Hn [cmds]
Example:	AT H3 O<CR>
Description:	Selects how the modem will hang up.
Command	Function
� H2	Set hang up mode to normal on next ATH command.
H3	Set hang up mode to fast on next ATH command.

HELP SCREENS
Type:	Immediate
Format:	AT $H=xxxx
Example:	AT $H=MNP<CR>
Description:	Shows modem help screens. If a string is included as shown in the example, the modem will perform a search for the string; otherwise, the whole help section will be displayed.

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] \Tn [cmds]
Example:	AT\T20<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.

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] S58=n [cmds]
Example:	AT S58=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.

LEASED LINE BACKUP NUMBER
Type:	Register
Format:	AT [cmds] S35=n [cmds]
Example:	AT S35=3<CR>
Description:	Sets the memory location the modem will dial for DTR dialing and leased-line backup.

LEASED LINE BACKUP RECOVERY DELAY
Type:	Register
Format:	AT [cmds] S28=n [cmds]
Example:	ATS28=5<CR>
Default:	15
Range:	0-255
Unit:	1 minute
Description:	After leased line failure, modem attempts to reconnect after specified delay.

LEASED LINE BACKUP - RESTORAL OPTIONS
Type:	Configuration
Format:	AT [cmds] *DBn [cmds]
Example:	AT *DB0 D555-1212<CR>
Description:	Selects what will initiate the restoral of a leased line connection.
Command	Function
� *DB0	Modem will restore connection only when modem receives LB or LD.
*DB1	Modem will restore connection automatically.

LEASED LINE BACKUP - RESTORE
Type:	Configuration
Format:	AT [cmds] *LB [cmds]
Example:	AT OR1 LB <CR>
Description:	Commands the modem to attempt to restore the leased line connection, or to wait for a leased line call if in answer-only mode.

LEASED LINE BACKUP - RESTORE MANUALLY
Type:	Configuration
Format:	AT [cmds] *LD [cmds]
Example:	AT OR0 LD <CR>
Description:	Commands the modem to dial the default number to restore the leased line connection.

LEASED LINE TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] *TLn [cmds]
Example:	AT *TL15<CR>
Default:	0
Range:	0 - 30
Unit:	-1 dBm
Description:	Sets the signal level for transmission when in leased line mode.

LEASED LINE TRANSMISSION LEVEL
Type:	Register
Format:	AT [cmds] S52=n [cmds]
Example:	AT S52=15<CR>
Default:	0
Range:	0 - 30
Unit:	-1 dBm
Description:	Sets the signal level for transmission when in leased line mode.

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Example:	AT &L2 H1 DT555-1212<CR>
Description:	Selects line type.
Command	Function
� &L0	Switched line.
&L1	2-wire leased line.
&L2	4-wire leased line.

LOCAL SERIAL PORT SPEED CHANGE ON PIN 23
Type:	Configuration
Format:	AT [cmds] *FBn [cmds]
Example:	AT *FB1<CR>
Description:	Selects whether a voltage transition on pin 23 will cause the modem to change the serial port speed.
Command	Function
� *FB0	Pin 23 transition ignored.
*FB1	Pin 23 negative causes modem to increase serial port speed; pin 23 positive causes modem to decrease serial port speed.

LOCAL SERIAL PORT SPEED - CURRENT
Type:	Configuration
Format:	AT [cmds] S80=n [cmds]
Example:	AT %L3 S80=14 \J0<CR>
Description:	Reports the current serial port speed.
Command	Function
1	300bps current speed.
2	600bps current speed.
3	1200bps current speed.
4	2400bps current speed.
5	4800bps current speed.
6	7200bps current speed.
7	9600bps current speed.
8	12Kbps current speed.
9	14.4Kbps current speed.
10	16.8Kbps current speed.
11	19.2Kbps current speed.
12	21.6Kbps current speed.
13	24Kbps current speed.
14	26.4Kbps current speed.
15	28.8Kbps current speed.
16	38.4Kbps current speed.
17	57.6Kbps current speed.
18	115.2Kbps current speed.

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.

LOOPBACK TEST ON PIN 18
Type:	Configuration
Format:	AT [cmds] *LAn [cmds]
Example:	AT*LA0<CR>
Description:	Controls whether the modem will perform a local analog loopback test when pin 18 goes high.
Command	Function
� *LA0	Pin 18 has no function.
*LA1	Pin 18 going high causes the modem to perform local analog loopback test.

LOOPBACK TEST ON PIN 21
Type:	Configuration
Format:	AT [cmds] *RDn [cmds]
Example:	AT*RD0<CR>
Description:	Controls whether the modem will perform a remote digital loopback test when pin 21 goes high.
Command	Function
� *RD0	Pin 21 has no function.
*RD1	Pin 21 going high causes the modem to perform remote digital loopback test.

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.

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Register
Format:	AT [cmds] S63=n [cmds]
Example:	AT S63=3 %C1<CR>
Description:	Sets the maximum transmittable block size.
Command	Function
S63=0	MNP block size is 64 characters.
S63=1	MNP block size is 128 characters.
S63=2	MNP block size is 192 characters.
� S63=3	MNP block size is 256 characters.

PROTOCOL/SPEED
Type:	Configuration
Format:	AT [cmds] *MMn [cmds]
Example:	AT %E1 *MM12<CR>
Description:	Selects the current protocol.
Command	Function
*MM0	Selects all protocols.
*MM1	Selects V.21 only.
*MM2	Selects Bell 103 only.
*MM3	Selects Bell 212 only.
*MM5	Selects V.22bis only.
*MM6	Selects V.27bis only.
*MM8	Selects V.29 only.
*MM10	Selects V.33 only.
*MM11	Selects V.32bis only.
*MM12	Selects V.34 only.

PROTOCOL/SPEED
Type:	Configuration
Format:	AT [cmds] S88=n [cmds]
Example:	AT %E1 S88=12<CR>
Description:	Selects the current protocol.
Command	Function
S88=0	Selects all protocols.
S88=1	Selects V.21 only.
S88=2	Selects Bell 103 only.
S88=3	Selects Bell 212 only.
S88=5	Selects V.22bis only.
S88=6	Selects V.27bis only.
S88=8	Selects V.29 only.
S88=10	Selects V.33 only.
S88=11	Selects V.32bis only.
S88=12	Selects V.34 only.

PROTOCOL/SPEED - CURRENT
Type:	Configuration
Format:	AT [cmds] S91? [cmds]
Example:	AT %E1 S91?<CR>
Description:	Reports the current protocol.
Value	Meaning
0	Modem will select protocol automatically.
1	V.21 only selected.
2	Bell 103 only selected.
3	Bell 212 only selected.
5	V.22bis only selected.
6	V.27bis only selected.
8	V.29 only selected.
10	V.33 only selected.
11	V.32bis only selected.
12	V.34 only selected.

REMOTE CONFIGURATION
Type:	Configuration
Format:	AT [cmds] %T=n [cmds] AT [cmds] D<#>%Tn [cmds]
Example:	AT &V2 %T=102475 AT D555-1212%T102475<CR>
Description:	Initiates a remote configuration session. This command may follow a dial command, omitting the equal sign, to initiate remote configuration immediately on connection. %T with no parameter will quit the current session.

REMOTE CONFIGURATION PASSWORD
Type:	Configuration
Format:	AT [cmds] %P=nnnn [cmds]
Example:	AT %P=102475 D555-1212<CR>
Default:	N/A
Range:	0-99999999, D, <none>
Description:	Sets the security code for remote configuration sessions. If nnnn is omitted, the code will be cleared; if a D is given, remote configuration is disabled.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Example:	AT I3 &V1 %V<CR>
Description:	Displays modem properties.
Command	Function
I0	Reports modem model and speed.
I1	Reports checksum number.
I3	Reports firmware version.
I4	Reports feature code.
I5	Reports reason for last disconnect.

REPORT INFORMATION AND CONFIGURATION PROFILE
Type:	Immediate
Format:	AT [cmds] &Vn [cmds]
Example:	AT I3 &V1 %V<CR>
Description:	Reports configuration profiles and other information.
Command	Function
&V0	Report configuration profiles.
&V1	Report connection status and internal modem information.
&V2	Report active configuration profile.

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

REPORT SERIAL NUMBER
Type:	Immediate
Format:	AT [cmds] $V [cmds]
Example:	AT I3 &V1 $V<CR>
Description:	Reports product serial number.

RESULT CODE MODE
Type:	Configuration
Format:	AT [cmds] *RCn [cmds]
Example:	AT *RC0<CR>
Description:	Selects normal or Motorola result code numbering.
Command	Function
� *RC0	Result code 15 is CONNECT 4800 and code 18 is CONNECT 9600 (standard).
*RC1	Result code 11 is CONNECT 4800 and code 12 is CONNECT 9600 (Motorola).

RESULT CODE MODE
Type:	Register
Format:	AT [cmds] S57=n [cmds]
Example:	AT S57=0<CR>
Description:	Selects normal or Motorola result code numbering.
Command	Function
� S57=0	Result code 15 is CONNECT 4800 and code 18 is CONNECT 9600 (standard).
S57=1	Result code 11 is CONNECT 4800 and code 12 is CONNECT 9600 (Motorola).

RETRAIN SENSITIVITY
Type:	Configuration
Format:	AT [cmds] %Rn [cmds]
Example:	AT &C3 %R1<CR>
Description:	Sets how poor line conditions must be before the modem will initiate a retrain.
Command	Function
� %R0	Modem will not initiate retrain.
%R1	Modem will initiate retrain when the Bit Error Rate exceeds 10-5 for eight seconds, or for one second in V.22bis mode.
%R2	Modem will initiate retrain when the Bit Error Rate exceeds 10-4 for eight seconds, or for one second in V.22bis mode.
%R3	Modem will initiate retrain when the Bit Error Rate exceeds 10-3 for eight seconds, or for one second in V.22bis mode.

RETRAIN SENSITIVITY
Type:	Register
Format:	AT [cmds] S53=n [cmds]
Example:	AT &C3 S53=1<CR>
Description:	Sets how poor line conditions must be before the modem will initiate a retrain.
Command	Function
� S53=0	Modem will not initiate retrain.
S53=4	Modem will initiate retrain when the Bit Error Rate exceeds 10-5 for eight seconds, or for one second in V.22bis mode.
S53=8	Modem will initiate retrain when the Bit Error Rate exceeds 10-4 for eight seconds, or for one second in V.22bis mode.
S53=12	Modem will initiate retrain when the Bit Error Rate exceeds 10-3 for eight seconds, or for one second in V.22bis mode.

RI SIGNAL
Type:	Configuration
Format:	AT [cmds] \Rn [cmds]
Example:	AT \R0 Q0<CR>
Description:	Controls the behavior of the Ring Indicator signal.
Command	Function
\R0	RI signal high during rings, and forced high for duration of call.
� \R1	RI signal high during rings only.

SECURITY - AUTOCALLBACK DELAY
Type:	Register
Format:	AT [cmds] S78=n [cmds]
Example:	AT S78=10<CR>
Default:	30
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait to execute the autocallback sequence after an incoming call is detected.

SECURITY - CALLBACK DELAY
Type:	Register
Format:	AT [cmds] S74=n [cmds]
Example:	AT S74=30<CR>
Default:	15
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait to execute a callback sequence after the user has disconnected.

SECURITY - CALLBACK NUMBER
Type:	Configuration
Format:	AT [cmds] $Cn=<#> [cmds]
Example:	AT $L0=3 $C0=1(303)443-3388<CR>
Description:	Sets the callback number for user number n.

SECURITY - CALLBACK RETRY
Type:	Register
Format:	AT [cmds] S75=n [cmds]
Example:	AT S75=5<CR>
Default:	Unidentified
Range:	0-255
Unit:	1 redial
Description:	Sets how many times the modem will attempt to execute a callback if the first call fails.

SECURITY - CALLBACK RETRY DELAY
Type:	Register
Format:	AT [cmds] S76=n [cmds]
Example:	AT S76=60<CR>
Default:	15
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait to execute another callback sequence after one has failed.

SECURITY CHECK
Type:	Immediate
Format:	AT [cmds] $D? [cmds] AT [cmds] $E? [cmds]
Example:	AT $DR $D?<CR>
Description:	Reports whether security is enabled.

SECURITY - DELETE USER
Type:	Configuration
Format:	AT [cmds] $Rn [cmds]
Example:	AT $R3<CR>
Description:	Deletes the user number n. User IDs 0 and 1 cannot be deleted.

SECURITY DISABLE
Type:	Immediate
Format:	AT [cmds] $D=xxxx
Example:	AT $D=MicroHouse<CR>
Description:	Disables security. A password must be specified.

SECURITY ENABLE - HIGH SECURITY
Type:	Immediate
Format:	AT [cmds] $EH=xxxx
Example:	AT $EH=SuperSecret<CR>
Description:	Enables security. The superuser password must be specified.

SECURITY ENABLE - LOW SECURITY
Type:	Immediate
Format:	AT [cmds] $E=xxxx
Example:	AT $E=MicroHouse<CR>
Description:	Enables security. A password must be specified.

SECURITY - FAILED LOGIN ATTEMPT COUNTERS
Type:	Configuration/Immediate
Format:	AT [cmds] $Mn [cmds]
Example:	AT $M $M*<CR>
Description:	Displays or clears the counters for failed login attempts. If a number is specified, the counter will be reset for that user. If an * follows, all counters will be cleared. If no character follows, the counters will be displayed.

SECURITY - FAILED LOGIN ATTEMPT MAXIMUM
Type:	Register
Format:	AT [cmds] S77=n [cmds]
Example:	AT S77=3<CR>
Default:	Unidentified
Range:	0-255
Unit:	1 attempt
Description:	Sets the maximum number of failed logins the modem will accept until it disconnects.

SECURITY - HIGH SECURITY PASSWORD
Type:	Configuration
Format:	AT [cmds] $Pn=xxxx$xxxx
Example:	AT $P0=SuperSecret$SuperSecret<CR>
Description:	Sets the password for user number n to xxxx. User number 0 is the superuser. The password must be between 4 and 34 characters inclusive. The $ character may not be used.

SECURITY - HIGH SECURITY RESET
Type:	Configuration
Format:	AT [cmds] $F=xxxx$xxxx
Example:	AT $F=SuperSecret$SuperSecret<CR>
Description:	Resets the high security options to their factory defaults.

SECURITY LEVEL
Type:	Configuration
Format:	AT [cmds] $Lm=n [cmds]
Example:	AT $L0=3 $C0=1(303)443-3388<CR>
Description:	Sets the security level for user number m.
Command	Function
$Lm=1	Modem prompts for a user ID and password on connection.
$Lm=2	Modem prompts for a user ID and password on connection, then modem begins callback sequence.
$Lm=3	Modem prompts for a user ID and password on connection, then modem begins callback sequence. When modem reconnects, it prompts for a user ID and password again.

SECURITY LOGIN
Type:	Immediate
Format:	AT [cmds] $n=xxxx [cmds]
Example:	AT $1=MicroHouse<CR>
Description:	Logs into modem, from the local machine or remotely.

SECURITY LOGOUT
Type:	Immediate
Format:	AT [cmds] $$ [cmds]
Example:	AT $$<CR>
Description:	Logs out from the modem.

SECURITY - LOW SECURITY PASSWORD
Type:	Configuration
Format:	AT [cmds] $S=xxxx
Example:	AT $S=MicroHouse<CR>
Description:	Sets an empty login password to xxxx.

SECURITY - LOW SECURITY PASSWORD CHANGE
Type:	Configuration
Format:	AT [cmds] $C=xxxx,yyyy
Example:	AT $CMicroHouse=Fubar<CR>
Description:	Changes the password xxxx to yyyy. If a - is given for yyyy, the password will be deleted.

SECURITY - LOW SECURITY RESET
Type:	Configuration
Format:	AT [cmds] $DR [cmds]
Example:	AT $DR $D?<CR>
Description:	Resets the low security options to their factory defaults.

SECURITY OPTIONS
Type:	Configuration
Format:	AT [cmds] $Wm=n [cmds]
Example:	AT $W0=3 $C0=1(303)443-3388<CR>
Description:	Controls what features a remote user has access to.
Command	Function
$W0	Remote users can access no extra features.
$W1	Remote users can change their passwords and callback numbers.
$W2	Remote users can change their passwords and callback numbers and login as the superuser.

SECURITY - PASSWORD TIME
Type:	Register
Format:	AT [cmds] S73=n [cmds]
Example:	AT S73=10<CR>
Default:	Unidentified
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait for a password when in secure mode.

SECURITY - REPORT SUPERUSER STATUS
Type:	Immediate
Format:	AT [cmds] $Sn? [cmds]
Example:	AT $S3?<CR>
Description:	Reports whether user n has superuser status.

SECURITY - REPORT USER SETTINGS
Type:	Immediate
Format:	AT [cmds] $In [cmds]
Example:	AT $I3<CR>
Description:	Reports security level and callback number for user n.

SECURITY - REPORT USERS SETTINGS
Type:	Immediate
Format:	AT [cmds] $IBn [cmds]
Example:	AT $IB11<CR>
Description:	Reports security level and callback number for the ten users beginning at user number n.

SECURITY - SUPERUSER MODE
Type:	Immediate
Format:	AT [cmds] $S=xxxx [cmds]
Example:	AT $S=SuperSecret<CR>
Description:	Attempts to enter superuser mode.

STATUS REGISTER BIT
Type:	Configuration
Format:	Write: AT [cmds] Sn.m=0 or 1 [cmds] Read: AT [cmds] Sn.m=? [cmds]
Example:	AT S40.4=1 S51.3?<CR>
Description:	Sets/clears or reads bit m of register n.

STATUS REGISTER HEXADECIMAL
Type:	Configuration
Format:	Write: AT [cmds] Sn^=hh [cmds] Read: AT [cmds] Sn?^ [cmds]
Example:	AT S99^=3F S99?^<CR>
Description:	Sets register n to hexadecimal number hh or displays register n in hexadecimal.

STORE PHONE NUMBER IN NVRAM
Type:	Configuration
Format:	AT [cmds] *CNn,<#>
Example:	AT AU4 CN4,1(303)443-3388<CR>
Description:	Stores a phone number in the modem�s memory.

SWITCHED LINE TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] %Zn [cmds]
Example:	AT %R1 %Z1<CR>
Description:	Sets the signal level for transmission.
Command	Function
� %Z0	Permissive transmission level (level fixed at -9dBm.)
%Z1	Programmable transmission level (level controlled by exterior resistor, or -12dBm if absent.)

SWITCHED LINE TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] *TDn [cmds]
Example:	AT *TD15<CR>
Default:	9
Range:	9 - 30
Unit:	-1 dBm
Description:	Sets the signal level for transmission when in switched line mode.

TALK/DATA MODE
Type:	Immediate
Format:	AT [cmds] *DAn [cmds]
Example:	AT *DA1 <CR>
Description:	Selects talk or data mode.
Command	Function
� *DA0	Talk mode enabled.
*DA1	Data mode enabled.

TEST MODE - BIDIRECTIONAL ANALOG LOOPBACK TEST
Type:	Configuration
Format:	AT [cmds] *ANn [cmds]
Example:	AT *AN1<CR>
Description:	Controls the bidirectional local analog loopback test mode.
Command	Function
� *AN0	End loopback test.
*AN1	Begin loopback test.

TEST MODE - BIDIRECTIONAL DIGITAL LOOPBACK TEST
Type:	Configuration
Format:	AT [cmds] *DGn [cmds]
Example:	AT *DG1<CR>
Description:	Controls the bidirectional local digital loopback test mode.
Command	Function
� *DG0	End loopback test.
*DG1	Begin loopback test.

TEST MODES
Format		AT [cmds] S34=n [cmds]
Example:		ATS34=4<CR>
Default:		0
Range:		0 - 15
Unit:		Bit-mapped
Description:		Initiates and controls loopback tests.
Bit	Value		Function
0	� 0 1		End bidirectional local analog loopback test. Begin bidirectional local analog loopback test.
1	� 0 1		End bidirectional local digital loopback test. Begin bidirectional local digital loopback test.
2	� 0 1		Pin 18 has no function. Pin 18 going high causes the modem to perform local analog loopback test.
3	� 0 1		Pin 21 has no function. Pin 21 going high causes the modem to perform remote digital loopback test.

TEST STATUS
Format		AT [cmds] S16=n [cmds]
Example:		ATS16=32<CR>
Default:		Read-only
Range:		0 - 255
Unit:		Bit-mapped
Description:		Contains status of loopback tests.
Bit	Value		Function
0	0 1		Local analog loopback test not in progress. Local analog loopback test in progress.
1	0 1		Remote analog loopback test not in progress. Remote analog loopback test in progress.
2	0 1		Local digital loopback test not in progress. Local digital loopback test in progress.
3	0 1		Remotely requested remote digital loopback test not in progress. Remotely requested remote digital loopback test in progress.
4	0 1		Locally requested remote digital loopback test not in progress. Locally requested remote digital loopback test in progress.
5	0 1		Remote digital loopback with local self-test not in progress. Remote digital loopback with local self-test in progress.
6	0 1		Local analog loopback with local self-test not in progress. Local analog loopback with local self-test in progress.
7	0 1		Remote analog loopback with local self-test not in progress. Remote analog loopback with local self-test in progress.

V.25bis OPTIONS
Format		AT [cmds] S30=n [cmds]
Example:		ATS30=4<CR>
Default:		0
Range:		0 - 230
Unit:		Bit-mapped
Description:		Controls V.25bis character set, VAL response, NRZ/NRZI, and communications mode.
Bit	Value		Function
0	0		Not used.
1	� 0 1		Use ASCII character set. Use EBCDIC character set.
2	� 0 1		VAL response enabled. VAL response disabled.
3	0		Not used.
4	0		Not used.
5	� 0 1		Use NRZ mode. Use NRZI mode.
7, 6	� 00 01 10 11		V.25bis command set disabled. V.25bis bisynchronous command, synchronous connect mode. V.25bis SDLC command, synchronous connect mode. V.25bis asynchronous command, synchronous connect mode.

V.32 HANDSHAKE OPTIONS
Type:	Configuration
Format:	AT [cmds] *FTn [cmds]
Example:	AT *FT0<CR>
Description:	Shortens V.32 and V.32bis handshake time.
Command	Function
� *FT0	Normal handshake sequence.
*FT1	Training time is shortened by 2 seconds in V.32 and V.32bis modes.

V.34 OPTIONS
Format:		AT [cmds] S95=n [cmds]
Example:		ATS95=240<CR>
Default:		240
Range:		0 - 240
Unit:		Bit-mapped
Description:		Controls non-linear coding, pre-emphasis, shaping, and pre-coding.
Bit	Value		Function
3 - 1	0		Not used.
4	0 � 1		Non-linear coding disabled. Non-linear coding enabled.
5	0 � 1		Pre-emphasis disabled. Pre-emphasis enabled.
6	0 � 1		Constellation shaping disabled. Constellation shaping enabled.
7	0 � 1		Pre-coding disabled. Pre-coding enabled.

V.34 OPTIONS
Format:		AT [cmds] S96=n [cmds]
Example:		ATS96=160<CR>
Default:		160
Range:		0 - 160
Unit:		Bit-mapped
Description:		Controls TX level deviation and asymmetric bit rates.
Bit	Value		Function
4 - 0	0		Not used.
5	0 � 1		Asymmetric bit rates disabled. Asymmetric bit rates enabled.
6	0		Not used.
7	0 � 1		TX level deviation disabled. TX level deviation enabled.

V.34 RETRAIN SENSITIVITY
Type:	Configuration
Format:	AT [cmds] *THn [cmds]
Example:	AT MM12 TH1<CR>
Description:	Sets how poor line conditions must be before the modem will initiate a retrain when in V.34 mode.
Command	Function
� *TH0	Modem will initiate retrain when the Bit Error Rate exceeds 10-6.
*TH1	Modem will initiate retrain when the Bit Error Rate exceeds 10-4.
*TH2	Modem will initiate retrain when the Bit Error Rate exceeds 10-2.

V.34 SPLIT BAUD MODE
Type:	Configuration
Format:	AT [cmds] *ASn [cmds]
Example:	AT *AS1 <CR>
Description:	Controls V.34 split baud mode.
Command	Function
*AS0	V.34 split baud mode disabled.
*AS1	V.34 split baud mode enabled.

V.42 NEGOTIATION MODE
Type:	Configuration
Format:	AT [cmds] \Mn [cmds]
Example:	AT \M0 H1 DT555-1212<CR>
Description:	Selects how the modem negotiates V.42 modulation during handshaking.
Command	Function
\M0	Normal handshaking enabled.
� \M1	Fast handshaking enabled.

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.

Proprietary V.25bis Command Set

CONNECTION
Type:	Response
Format:	CNX@nnnnnBPS
Description:	A connection has been successfully established at the rate specified.

DISPLAY CURRENT COMMAND STATUS
Type:	Immediate
Format:	RLOnnn;xx
Example:	RLO112;2<CR>
Description:	Displays current setting of modem commands. If no parameters are given, all commands will be displayed. Otherwise, xx addresses will be displayed beginning at nnn.

DISPLAY LINKED NUMBERS
Type:	Immediate
Format:	RLL
Example:	RLL<CR>
Description:	Requests the modem to return the list of linked stored numbers.

DISPLAY STORED NUMBERS
Type:	Immediate
Format:	RLN
Example:	RLN<CR>
Description:	Requests the modem to return the list of stored numbers.

INVALID
Type:	Response
Format:	INVxx
Example:	INVCU
Description:	The modem was issued an improper command. The two letters following indicate the error.
Code	Meaning
INVCU	An error occurred in transmission.
INVMS	The command was too long or was followed by a semicolon.
INVPS	An improper number parameters were issued.
INVPV	The parameters were ignored or invalid.

LINK STORED NUMBERS
Type:	Configuration
Format:	PRLm;n
Example:	PRL1;2<CR>
Description:	Links memory location m to memory location n. If a call to location m fails, the number at n will be dialed.

REDIAL
Type:	Immediate
Format:	CRRn
Example:	CRR4<CR>
Description:	Redials the last number dialed up to n times.

REPORT PRODUCT VERSION
Type:	Immediate
Format:	RLV
Example:	RLV<CR>
Description:	Reports product version.

RESET MODEM TO STORED PROFILE
Type:	Immediate
Format:	PRPn
Example:	PRP3<CR>
Description:	Resets modem to stored profile n.

SET OPTIONS
Type:	Configuration
Format:	PROnnn;aa;bb;cc...
Example:	PRO112;02;01<CR>
Description:	Sets various options. The first number is the first address to set. Following parameters set the addresses, starting with nnn and progressing. In this example, address 112 would be set to 02 and address 113 would be set to 01.

STORE ACTIVE PROFILE
Type:	Immediate
Format:	PRK
Example:	PRK<CR>
Description:	Writes the values for the current profile into the non-volatile RAM.