CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN3	DC power	CN1
Line in	CN4	Volume	R1
RS-232/422	CN2	Power switch	SW2

DTR SIGNAL
Setting	SW1/1
» DTR normal	Off
DTR forced high	On

RESULT CODES
Setting	SW1/2
» Verbal result codes enabled	Off
Numeric result codes enabled	On

RESULT CODES DISPLAY
Setting	SW1/3
» Enabled	On
Disabled	Off

ECHO DISPLAY
Setting	SW1/4
» Enabled	Off
Disabled	On

AUTO ANSWER
Setting	SW1/5
» Disabled	On
Enabled	Off

CARRIER DETECT
Setting	SW1/6
» CD normal	Off
CD forced high	On

SOFTWARE RESET
Setting	SW1/7
» CD normal	Off
CD forced high	On

AT COMMAND SET
Setting	SW1/8
Enabled	On
Disabled	Off

DIAGNOSTIC LED(S)
LED	Color	Status	Mode	Condition
AA	Red	On	Answer	Auto-answer enabled
AA	Red	Off	N/A	Auto-answer disabled
AA	Red	Blinking	N/A	Phone is ringing
CD	Red	On	N/A	Carrier signal detected
CD	Red	Off	N/A	Carrier signal not detected
RD	Red	Blinking	N/A	Modem is receiving data or sending result codes
RD	Red	Off	N/A	Modem is not receiving data
SD	Red	Blinking	N/A	Modem is transmitting data
SD	Red	Off	N/A	Modem is not transmitting data
TR	Red	On	N/A	DTR signal is high
TR	Red	Off	N/A	DTR signal is low
CS	Red	On	N/A	CTS high
CS	Red	Off	N/A	CTS normal
ARQ/FAX	Red	On	Data	Error control connection established
ARQ/FAX	Red	Blinking	Data	Error control data is being transmitted
ARQ/FAX	Red	Blinking	Fax	Modem is connected in FAX mode

BIT-MAPPED REGISTER S13
Format:		AT [cmds] S13=n [cmds]
Example:		ATS13=13<CR>
Default:		0
Range:		0 - 89
Unit:		Bit-mapped
Description:		Controls DTR reset, DTR dialing, reset dialing, and MNP3.
Bit	Value		Function
0	» 0 1		DTR normal. Reset on low DTR.
1	» 0		Not used.
2	» 0		Not used.
3	» 0 1		DTR dialing disabled. DTR dialing enabled.
4	» 0 1		Reset dialing disabled. Reset dialing enabled.
5	» 0		Not used.
6	» 0 1		MNP 3 enabled. MNP 3 disabled.
7	» 0		Not used.

BIT-MAPPED REGISTER S15
Format:		AT [cmds] S15=n [cmds]
Example:		ATS15=13<CR>
Default:		0
Range:		0 - 56
Unit:		Bit-mapped
Description:		Controls non-error-correcting mode buffer, MNP4, and BS/DEL switch.
Bit	Value		Function
0	» 0		Not used.
1	» 0		Not used.
2	» 0		Not used.
3	» 0 1		Non-error-correcting mode transmit buffer set to 1.5KB. Non-error-correcting mode transmit buffer set to 128 bytes.
4	» 0 1		MNP 4 enabled. MNP 4 disabled.
5	» 0 1		Use backspace key for delete disabled. Use backspace key for delete enabled.

BIT-MAPPED REGISTER S27
Format:		AT [cmds] S27=n [cmds]
Example:		ATS27=139<CR>
Default:		0
Range:		0 - 191
Unit:		Bit-mapped
Description:		Controls V.21, V.32 encoding and modulation, V.42 answer tone and handshake, and 9600 result codes.
Bit	Value		Function
0	» 0 1		V.21 disabled. V.21 enabled.
1	» 0 1		V.32 trellis coding disabled. V.32 trellis coding enabled.
2	» 0 1		V.32 modulation enabled. V.32 modulation disabled.
3	» 0 1		2100Hz answer tone enabled. 2100Hz answer tone disabled.
5, 4	» 00 01 10 11		V.42 detect, LAPM and MNP enabled. V.42 detect and LAPM enabled. MNP enabled. LAPM enabled.
6	» 0		Not used.
7	» 0 1		Actual result codes displayed. Force 9600 result codes.

COMPRESSION AND ERROR CORRECTION
Format:		AT [cmds] S51=n [cmds]
Example:		ATS51=3<CR>
Default:		0
Range:		0 - 7
Unit:		Bit-mapped
Description:		Selects compression and error correction for specific modulations.
Bit	Value		Function
0	» 0 1		MNP/V.42 enabled during V.22 operation. MNP/V.42 disabled during V.22 operation.
1	» 0 1		MNP/V.42 enabled during V.22bis operation. MNP/V.42 disabled during V.22bis operation.
2	» 0 1		MNP/V.42 enabled during V.32bis operation. MNP/V.42 disabled during V.32bis operation.

BIT-MAPPED REGISTER S56
Format:		AT [cmds] S56=n [cmds]
Example:		ATS56=139<CR>
Default:		0
Range:		0 - 223
Unit:		Bit-mapped
Description:		Controls non-linearing coding, TX level deviation, pre-emphasis, pre-coding, shaping, V.34, and V.FC.
Bit	Value		Function
0	» 0 1		Non linearing coding enabled. Non linearing coding disabled.
1	» 0 1		TX level deviation enabled. TX level deviation disabled.
2	» 0 1		Pre-emphasis enabled. Pre-emphasis disabled.
3	» 0 1		Pre-coding enabled. Pre-coding disabled.
4	» 0 1		Shaping enabled. Shaping disabled.
5	» 0		Not used.
6	» 0 1		V.34 enabled. V.34 disabled.
7	» 0 1		V.FC enabled. V.FC disabled.

BREAK LENGTH
Type:	Register
Format:	AT [cmds] S21=n [cmds]
Example:	ATS21=20<CR>
Default:	10
Range:	0-255
Unit:	10 ms
Description:	Sets the length of error correction mode breaks sent from DCE to DTE in ARQ mode.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] &Yn [cmds]
Example:	AT &Y0<CR>
Description:	Configures action of break signal.
Command	Function
&Y0	Break empties buffer.
» &Y1	Break empties buffer and is sent immediately.
&Y2	Break does not empty buffer and is sent immediately.

CONNECTION SPEED UPPER LIMIT
Type:	Configuration
Format:	AT [cmds] &Nn [cmds]
Example:	AT &N1 DT555-1212<CR>
Description:	Sets required connection speed if &U is set to 0. Otherwise, sets fastest allowed connection speed.
Command	Function
» &N0	Variable.
&N1	300bps
&N2	1200bps
&N3	2400bps
&N4	4800bps
&N5	7200bps
&N6	9600bps
&N7	12Kbps
&N8	14.4Kbps
&N9	16.8Kbps
&N10	19.2Kbps
&N11	21.6Kbps
&N12	24Kbps
&N13	26.4Kbps
&N14	28.8Kbps

CONNECTION SPEED LOWER LIMIT
Type:	Configuration
Format:	AT [cmds] &Un [cmds]
Example:	AT &U1 DT555-1212<CR>
Description:	Sets slowest allowed connection speed if &N is set to 1 or higher.
Command	Function
» &U0	Disabled.
&U1	300bps
&U2	1200bps
&U3	2400bps
&U4	4800bps
&U5	7200bps
&U6	9600bps
&U7	12000bps
&U8	14400bps
&U9	16800bps
&U10	19200bps
&U11	21600bps
&U12	24000bps
&U13	26400bps
&U14	28800bps

ERROR CONTROL MODE
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Example:	AT &M1 %C1<CR>
Description:	Selects active error-control protocols.
Command	Function
&M0	Normal mode, error control disabled.
» &M4	Normal/ARQ.
&M5	ARQ mode.

ESCAPE CHARACTER RESPONSE
Type:	Register
Format:	AT [cmds] S14=n [cmds]
Example:	ATS14=0<CR>
Default:	0
Description:	Controls reaction to escape character.
Command	Function
» S14=0	Normal operation.
S14=1	When +++ is received, modem goes on hook, enters command state and sends NO CARRIER result code.

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] &An [cmds]
Example:	AT &A1 %C1<CR>
Description:	Selects extended result codes.
Command	Function
&A0	Extended result codes disabled.
&A1	ARQ result codes enabled.
&A2	V.32 result code enabled.
» &A3	Error correction and compression result codes enabled.

FLOW CONTROL CHARACTER - XON
Type:	Register
Format:	AT [cmds] S22=n [cmds]
Example:	ATS22=20<CR>
Default:	17
Range:	0-127
Unit:	ASCII
Description:	Sets the character used to represent XON.

FLOW CONTROL CHARACTER - XOFF
Type:	Register
Format:	AT [cmds] S23=n [cmds]
Example:	ATS23=20<CR>
Default:	19
Range:	0-127
Unit:	ASCII
Description:	Sets the character used to represent XOFF.

FLOW CONTROL PASSTHROUGH
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Example:	AT &I0 &W<CR>
Description:	Allows modem to act on, then transmit XON/XOFF characters.
Command	Function
» &I0	Software flow control disabled.
&I1	XON/XOFF passthrough enabled.
&I2	XON/XOFF passthrough disabled.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] &Hn [cmds]
Example:	AT &H0 A<CR>
Description:	Sets type of flow control used by modem.
Command	Function
&H0	Flow control disabled.
» &H1	CTS/RTS flow control enabled.
&H2	XON/XOFF flow control enabled.
&H3	CTS/RTS and XON/XOFF flow control enabled.

HELP SCREENS
Type:	Immediate
Format:	AT <prefix>$
Example:	AT &$<CR>
Description:	Shows command help screens for all commands beginning with the given prefix, or no prefix if none is given.
Command	Function
$	Shows AT help screen.
&$	Shows AT& help screen.

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] S19=n [cmds]
Example:	ATS19=20<CR>
Default:	0
Range:	Unidentified
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects.

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] &Bn [cmds]
Example:	AT &N9 &B0<CR>
Description:	Sets operation of serial port speed.
Command	Function
&B0	Serial speed follows connect speed.
» &B1	Serial speed locked.
&B2	Serial speed locked in ARQ mode only.

MAPPING
Format:		AT [cmds] S55=n [cmds]
Example:		ATS55=13<CR>
Default:		0
Range:		0 - 15
Unit:		Bit-mapped
Description:		Controls mapping.
Bit	Value		Function
0	» 0 1		8S-2D map enabled. 8S-2D map disabled.
1	» 0 1		16S-4D map enabled. 16S-4D map disabled.
2	» 0 1		32S-2D map enabled. 32S-2D map disabled.
3	» 0 1		64S-4D map enabled. 64S-4D map disabled.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Example:	AT I1 O<CR>
Description:	Displays modem properties.
Command	Function
I0	Reports product code.
I1	Reports ROM checksum result.
I2	Reports RAM checksum result.
I3	Reports firmware version.
I4	Reports current command settings.
I5	Reports current NVRAM settings.
I6	Reports current connection’s statistics.
I7	Reports configuration.

BAUD RATE
Format:		AT [cmds] S54=n [cmds]
Example:		ATS54=139<CR>
Default:		0
Range:		0 - 255
Unit:		Bit-mapped
Description:		Controls baud rate.
Bit	Value		Function
0	» 0 1		2400 baud rate enabled. 2400 baud rate disabled.
1	» 0 1		2743 baud rate enabled. 2743 baud rate disabled.
2	» 0 1		2800 baud rate enabled. 2800 baud rate disabled.
3	» 0 1		3000 baud rate enabled. 3000 baud rate disabled.
4	» 0 1		3200 baud rate enabled. 3200 baud rate disabled.
5	» 0 1		3429 baud rate enabled. 3429 baud rate disabled.
6	» 0 1		Call indicate during V.34 operation enabled. Call indicate during V.34 operation disabled.
7	» 0 1		V.8 during V.34 operation enabled. V.8 during V.34 operation disabled.

TONE DIALING TEST
Type:	Register
Format:	AT [cmds] S16=n [cmds]
Example:	ATS16=1<CR>
Description:	Selects the tone dialing test
Command	Function
» S16=0	Tone dialing test disabled.
S16=1	Tone dialing test enabled.

V.32 AND V.32bis MODULATIONS
Format:		AT [cmds] S34=n [cmds]
Example:		ATS34=13<CR>
Default:		6
Range:		0 - 15
Unit:		Bit-mapped
Description:		Controls V.32 and V.32bis modulations.
Bit	Value		Function
0	» 0 1		V.32bis enabled. V.32bis disabled.
1	» 1		Not used.
2	» 1		Not used.
3	» 0 1		V.32 modulation disabled. V.32 modulation enabled.

V.32 HANDSHAKE TIME
Type:	Register
Format:	AT [cmds] S28=n [cmds]
Example:	ATS28=20<CR>
Default:	8
Range:	0-255
Unit:	.1 second
Description:	Sets length of V.32 handshake.