CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	DC power	CN4
Line in	CN2	Power switch	SW1
RS-232/422	CN3

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
HS	Red	On	Modem is operating at 2400bps
HS	Red	Off	Modem is operating at slower than 2400bps
AA	Red	On	Auto-answer enabled
AA	Red	Off	Auto-answer disabled
AA	Red	Blinking	Phone is ringing
CD	Red	On	Carrier signal detected
CD	Red	Off	Carrier signal not detected
OH	Red	On	Modem is off-hook
OH	Red	Off	Modem is on-hook
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
SD	Red	On	Modem is transmitting data
SD	Red	Off	Modem is not transmitting data
TR	Red	On	DTR signal is high
TR	Red	Off	DTR signal is low
MR	Red	On	Power is on
MR	Red	Off	Power is off
Note: The LEDs are Icons

AUTO FALL FORWARD/FALLBACK
Type:	Configuration
Format:	AT [cmds] %Gn [cmds]
Description:	Selects auto fallback
Command	Function
» %G0	Fallback disabled
%G1	Fallback enabled

AUTO-RETRAIN - FALLBACK/FALLFORWARD
Type:	Configuration
Format:	AT [cmds] %En [cmds]
Description:	Controls auto-retrain mode and fallback/fall forward
Command	Function
%E0	Auto-retrain disabled
%E1	Auto-retrain enabled
%E2	Fallback/fall forward enabled
%E3	Auto-retrain enabled, modem hangs up when line quality deteriorates.

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14? [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays 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? [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
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		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]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays speaker volume and controls, limits results codes, and make/break pulse ratio.
Bit	Value		Function
1, 0	00 01 10 11		On volume Low level 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? [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays remote digital loopback, DTE rate and parity, and guard tone.
Bit	Value		Function
0	0 1		Remote digital loopback denied Remote digital loopback allowed
3, 2, 1	000 001 010 011 100 101 110 111		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 Sets serial port speed to 38400bps
5,4	0		Not used
7, 6	00 01 10		Guard tone disabled Guard tone 550Hz enabled Guard tone 1800Hz enabled

BIT-MAPPED REGISTER S27
Format		AT [cmds] S27? [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays synchronous/asynchronous mode, Line type, clock source, and ITU-T/Bell modes.
Bit	Value		Function
3, 1, 0	000 001 010 011 100		Asynchronous mode, serial port speed follows connect speed Asynchronous command mode and synchronous connect mode Asynchronous command mode and synchronous connect mode Asynchronous command mode on low DTR, synchronous connect mode on high DTR Hayes AutoSync™ mode
2	0 1		Dial up line Leased line
5, 4	00 01 10		Internal transmit clock source External transmit clock source Remote transmit clock source
6	0 1		CCITT mode Bell mode

BIT-MAPPED REGISTER S28
Format		AT [cmds] S28=n [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays V.23 split baud mode, V.23 speed/direction, pulse dialing, and MNP10 link negoiation.
Bit	Value		Function
0	0 1		V.23 split baud mode disabled V.23 split baud mode enabled
1	0 1		Select 75bps transmit, 1200bps receive Select 1200bps transmit, 75bps receive
2	0		Not used
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
5	0		Not used
7, 6	00 01 10		Link will be negotiated at highest possible speed Link will be negotiated at 1200bps Link will be negotiated at 4800bps

BIT-MAPPED REGISTER S31
Format		AT [cmds] S31=n [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays 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

BIT-MAPPED REGISTER S40
Format		AT [cmds] S40=n [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays MNP10 services, break control, and MNP block size.
Bit	Value		Function
1, 0	00 01 10		MNP10 disabled MNP10 enabled MNP10 enabled on originate mode only
0	0 1		MNP10 disabled MNP10 enabled
1	0 1		MNP10 at 2400 and 1200bps disabled MNP10 at 2400 and 1200bps enabled
2	0 1		Power level adjustment disabled Power level adjustment enabled
5 - 3	000 001 010 100 101 110		\K0 \K1 \K2 \K3 \K4 \K5
7, 6	00 01 10 11		MNP block size is 64 characters MNP block size is 128 characters MNP block size is 192 characters MNP block size is 256 characters

BIT-MAPPED REGISTER S41
Format		AT [cmds] S41=n [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays compression, auto-retrain, flow control, stream/block mode and MNP10 fallback.
Bit	Value		Function
1, 0	00 01 10 11		Data compression disabled MNP5 enabled V.42bis enabled MNP5 and V.42bis enabled
6, 2	00 01 10		Auto-retrain disabled Auto-retrain enabled %E2
3	0 1		Flow control disabled Flow control enabled
4	0 1		Stream mode for MNP Block mode for MNP
7	0 1		MNP10 at 2400 and 1200bps disabled MNP10 at 2400 and 1200bps enabled

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Default:	Unidentified
Range:	0-9
Unit:	.1 second
Description:	Sends break to modem

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] \Kn [cmds]
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

CELLULAR TRANSMISSION LEVEL
Type:	Register
Format:	AT [cmds] S201=n [cmds]
Default:	10
Range:	0-15
Unit:	-1 dBm
Description:	Controls cellular transmission level

COMPRESSION
Type:	Configuration
Format:	AT [cmds] %Cn [cmds]
Description:	Selects data compression
Command	Function
%C0	Data compression disabled
%C1	MNP5 enabled
%C2	V.42bis enabled
» %C3	Both MNP5 AND V.42bis enabled

COMPROMISE EQUALIZER
Type:	Configuration
Format:	AT [cmds] :En [cmds]
Description:	Controls V.32 compromise equalizer
Command	Function
:E0	Equalizer disabled
» :E1	Equalizer enabled

CONNECT MODE
Type:	Configuration
Format:	AT [cmds] \Nn [cmds]
Description:	Sets connect mode
Command	Function
\N0	Normal mode enabled
\N1	Direct mode enabled
\N2	Reliable mode enabled
» \N3	Auto-reliable mode enabled
\N4	LAPM mode enabled
\N5	MNP mode enabled

FAX TRANSMISSION LEVEL
Type:	Register
Format:	AT [cmds] S92=n [cmds]
Default:	10
Range:	0-15
Unit:	-1 dBm
Description:	Controls fax transmission level

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] \Gn [cmds]
Description:	Selects modem port flow control
Command	Function
» \G0	Flow control disabled
\G1	Flow control enabled

FLOW CONTROL CHARACTER - XON
Type:	Register
Format:	AT [cmds] S32=n [cmds]
Default:	17
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XON

FLOW CONTROL CHARACTER - XOFF
Type:	Register
Format:	AT [cmds] S33=n [cmds]
Default:	19
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XOFF

LEASED LINE TRANSMISSION LEVEL
Type:	Register
Format:	AT [cmds] S99=n [cmds]
Default:	10
Range:	0-15
Unit:	-1 dBm
Description:	Controls leased-line transmission level

LINE SIGNAL LEVEL
Type:	Immediate
Format:	AT [cmds] %L [cmds]
Range:	9-43
Unit:	-1dBm
Description:	Returns received line signal level

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Configuration
Format:	AT [cmds] \An [cmds]
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

MNP10 COMPRESSION
Type:	Configuration
Format:	AT [cmds] -Kn [cmds]
Description:	Selects MNP10 data compression
Command	Function
-K0	MNP10 disabled
» -K1	MNP10 enabled
-K2	MNP10 enabled on originate mode only

MNP10 FALL-BACK
Type:	Configuration
Format:	AT [cmds] -Qn [cmds]
Description:	Allows MNP10 to fall back to speeds slower than 4800bps
Command	Function
-Q0	MNP10 at 2400 and 1200bps disabled
» -Q1	MNP10 at 2400 and 1200bps enabled

MNP10 LINK NEGOTIATION
Type:	Configuration
Format:	AT [cmds] *Hn [cmds]
Description:	Sets the speed at which MNP10 link negotiation will occur
Command	Function
» *H0	Link will be negotiated at highest possible speed
*H1	Link will be negotiated at 1200bps

MNP10 POWER LEVEL ADJUST
Type:	Configuration
Format:	AT [cmds] )Mn [cmds]
Description:	Controls automatic transmit power level adjustment during MNP 10 link negotiation
Command	Function
» )M0	Power level adjustment disabled
)M1	Power level adjustment enabled

REMOTE ACCESS ESCAPE CHARACTER
Type:	Register
Format:	AT [cmds] S202=n [cmds]
Default:	Unidentified
Range:	0-255
Unit:	ASCII
Description:	Sets the remote access escape character

REPORT LINE SIGNAL QUALITY
Type:	Immediate
Format:	AT [cmds] %Q [cmds]
Description:	Returns line signal quality

SLEEP TIMER
Type:	Register
Format:	AT [cmds] S24=n [cmds]
Default:	0
Range:	0-255
Unit:	1 second
Description:	Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode

SWITCHED TRANSMISSION LEVEL
Type:	Register
Format:	AT [cmds] S91=n [cmds]
Default:	10
Range:	0-15
Unit:	-1 dBm
Description:	Controls switched transmission level

TEST MODES
Format		AT [cmds] S16? [cmds]
Default:		Read-only
Range:		0-255
Unit:		Bit-mapped
Description:		Displays 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

TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] @Mn [cmds]
Default:	Unidentified
Range:	11-31
Unit:	-1 dBm
Description:	Sets initial transmit power level for transmission
í Command	Function
@M0	-26dBm
@M1	-30dBm
@M2-@M10	-10dBm