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
AA	Red	On	Auto-answer enabled
AA	Red	Off	Auto-answer disabled
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
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
TR	Red	On	DTR signal is high
TR	Red	Off	DTR signal is low
TM	Red	On	Test mode enabled
TM	Red	Off	Test mode disabled
TM	Red	Slow blink	RAM test failed
TM	Red	Medium blink	ROM test failed
TM	Red	Fast blink	MDP(Data Pump) test failed

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 will hang up if EQM reaches hang up threshold

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14=n [cmds]
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]
Default:		0
Range:		0-248
Unit:		Bit-mapped
Description:		Selects low DTR action, DCD signal, DSR signal, and the Long Space Disconnect function
Bit	Value		Function
2 - 0	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 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]
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 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=n [cmds]
Default:		55
Range:		0-189
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]
Default:		73
Range:		0-73
Unit:		Bit-mapped
Description:		Selects sync/async mode and ITU-T/Bell modes
Bit	Value		Function
3, 1, 0	000 » 101		Asynchronous mode, serial port speed follows connect speed Error correction mode
5, 4, 2	0		Not used
6	0 » 1		CCITT mode Bell mode

BIT-MAPPED REGISTER S28
Format		AT [cmds] S28=n [cmds]
Default:		0
Range:		0-128
Unit:		Bit-mapped
Description:		Controls pulse dialing and MNP10 link negotiation
Bit	Value		Function
2 - 0	0		Not used
4, 3	» 00		39ms make/61ms break at 10pps
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:		2
Range:		0-10
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

BIT-MAPPED REGISTER S40
Format		AT [cmds] S40=n [cmds]
Default:		105
Range:		0-239
Unit:		Bit-mapped
Description:		Controls power level and break handling; selects MNP extended services, link negotiation, and 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, 4, 3	000 001 010 011 100 » 101		\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:		195
Range:		0-223
Unit:		Bit-mapped
Description:		Selects compression, auto-retrain, flow control, MNP mode, and fallback-V.22/22bbis
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 11		Auto-retrain disabled Auto-retrain enabled Fallback/fall forward enabled Auto-retrain enabled, modem will hang up if EQM reaches hang up threshold
3	» 0 1		Flow control disabled Flow control enabled
4	» 0 1		Stream mode for MNP Block mode for MNP
5	0		Not used
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:	3
Range:	1-9
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 Reliable/Normal mode	Break from DTE Direct mode	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 DTE
\K1		Buffers cleared and break sent to remote modem	Send break to remote modem immediately, then enter command mode	Buffers cleared and break sent to DTE
\K2		Enter command mode, do not send break to remote modem	Send break to remote modem immediately	Send break to DTE immediately
\K3		Send break to remote modem immediately	Send break to remote modem immediately, then enter command mode	Send break to DTE immediately
\K4		Enter command mode, do not send break to remote modem	Send break to remote modem immediately	Break sent with received data to the DTE
» \K5		Send break with transmitted data	Send break to remote modem immediately	Break sent with received data to the DTE

CELLULAR TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] @Mn [cmds]
Default:	0
Range:	11-31
Unit:	-1dBm
Description:	Sets the signal level for transmission
Command	Function
@M0	-26dBm
@M1	-30dBm
@M2-@M10	-10dBm

CELLULAR TRANSMISSION LEVEL
Format		AT [cmds] S201=n [cmds]
Default:		58
Range:		0-63
Unit:		Bit-mapped
Description:		Controls cellular transmission level and compromise equalizer
Bit	Value		Function
4 - 0	00000 00001 00010 ... 01010 01011 ... » 11010 ... 11111		Sets cellular transmit level level to -26dBm Sets cellular transmit level level to -30dBm Sets cellular transmit level level to -10dBm ... Sets cellular transmit level level to -10dBm Sets cellular transmit level level to -11dBm ... Sets cellular transmit level level to -26dBm ... Sets cellular transmit level level to -31dBm
5	0 » 1		Equalizer disabled Equalizer enabled

CHANGE DIAL CODES
Type:	Configuration
Format:	AT [cmds] *Zn [cmds]
Description:	Selects dial codes, for International use
Command	Function
*Z0	Enable dial code 0
*Z1	Enable dial code 1

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	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

DIAL
Type:	Immediate
Format:	AT [cmds] D<#> [cmds]
Description:	Dials telephone number according to any modifiers included in the string
Modifier	Function
J	Link will be negotiated at 1200bps
K	Power level adjustment enabled
L	Redials last valid dial string
P	Pulse dialing enabled
S=c	Number in memory location c dialed
T	Tone dialing enabled
W	Dialing resumed following dial tone detection
@	Modem waits for a ring-back signal followed by silence up to the time specified in S7 prior to executing the rest of the dial string.
!	Flash function initiated Modem commanded to go on-hook for specified time
;	Modem returned to command mode after dialing
^	Disable calling tone
&	Detect bong tone. Modem waits for time specified in S6 before returning NO DIALTONE.

DISPLAY STORED NUMBERS
Type:	Immediate
Format:	AT [cmds] \F [cmds]
Description:	Displays all stored phone numbers

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

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.

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

MNP STREAM/BLOCK MODE
Type:	Configuration
Format:	AT [cmds] \Ln [cmds]
Description:	Selects the transfer mode for MNP
Command	Function
» \L0	Stream mode for MNP enabled
\L1	Block mode for MNP enabled

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

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 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
*H2	Link will be negotiated at 4800bps
Note: *H2 not supported with )M1

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
Note: )M1 not supported with *H2

MODULATION SELECTION DISPLAY
Type:	Immediate
Format:	AT [cmds] +MSUnidentified [cmds]
Description:	Displays modulation, automode, minimum rate and maximum rate settings

MODULATION SELECTION
Type:	Configuration
Format:	AT [cmds] +MS=xx,y,zzz,aaa [cmds]
Description:	Sets options for active protocol. The transfer rates specified by z and a must be valid for the protocol selected
Command	Function
x=0	V.21
x=1	V.22
x=2	V.22bis
x=3	V.23
x=9	V.32
x=10	V.32bis
» x=11	V.34
x=64	Bell 103A
x=69	Bell 212A
x=74	V.FC
y=0	Automode disabled
» y=1	Auto-detect highest speed enabled
» z, a=300	Set minimum or maximum transfer rate at 300bps, respectively
z, a=1200	Set minimum or maximum transfer rate at 1200bps, respectively
z, a=2400	Set minimum or maximum transfer rate at 2400bps, respectively
z, a=4800	Set minimum or maximum transfer rate at 4800bps, respectively
z, a=7200	Set minimum or maximum transfer rate at 7200bps, respectively
z, a=9600	Set minimum or maximum transfer rate at 9600bps, respectively
z, a=12000	Set minimum or maximum transfer rate at 12000bps, respectively
z, a=14400	Set minimum or maximum transfer rate at 14400bps, respectively
z, a=16800	Set minimum or maximum transfer rate at 16800bps, respectively
z, a=19200	Set minimum or maximum transfer rate at 19200bps, respectively
z, a=21600	Set minimum or maximum transfer rate at 21600bps, respectively
z, a=24000	Set minimum or maximum transfer rate at 24000bps, respectively
z, a=26400	Set minimum or maximum transfer rate at 26400bps, respectively
» z, a=28800	Set minimum or maximum transfer rate at 28800bps, respectively

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays modem properties
Command	Function
I0	Reports OK
I1	Performs checksum of firmware ROM and displays results
I2	Performs checksum of firmware ROM and displays status (OK or ERROR)
I3	Reports firmware version, model code, interface type, and MCU model
I4	Reports identifier string
I5	Reports country code
I6	Reports modem data pump model, internal code revision and CEP internal code revision.

REPORT LINE SIGNAL QUALITY
Type:	Immediate
Format:	AT [cmds] %Q [cmds]
Description:	Reports line signal quality. If the value is greater than 7, the modem will retrain.

SLEEP TIMER
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.

TEST MODES
Format		AT [cmds] S16=n [cmds]
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
2, 1	0		Not used
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

V.23 SPLIT BAUD MODE
Type:	Configuration
Format:	AT [cmds] \Wn [cmds]
Description:	Controls V.23 split baud mode
Command	Function
» \W0	V.23 split baud mode disabled
\W1	V.23 split baud mode enabled

V.23 SPLIT-SPEED DIRECTION
Type:	Configuration
Format:	AT [cmds] %Fn [cmds]
Description:	Selects flow control
Command	Function
%F1	75bps transmit/1200bps receive enabled
%F2	75bps receive/1200bps transmit enabled