CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	Line in	CN2

BASE I/O ADDRESS SELECTION
Port	SW1/1	SW1/2	SW1/3	SW1/5
COM1: (3F8h)	On	Off	On	Off
COM2: (2F8h)	On	Off	Off	On
COM3: (3E8h)	Off	On	On	Off
COM4: (2E8h)	Off	On	Off	On

INTERRUPT SELECTION
IRQ	SW1/4	SW1/6	SW1/7	SW1/8
2	Off	Off	Off	On
3	Off	On	Off	Off
4	On	Off	Off	Off
5	Off	Off	On	Off

AUTO FALLBACK CHARACTER
Type:	Register
Format:	AT [cmds] S43=n [cmds]
Example:	AT S43=13 <CR>
Description:	Set auto fallback character during MNP negotiation. (%An)
Notes	S43=0, disabled. S43=(1 - 127), enabled.

AUTO FALL FORWARD/FALLBACK
Type:	Configuration
Format:	AT [cmds] %Gn [cmds]
Example:	AT %G &W <CR>
Description:	Selects auto fallback.
Command	Function
%G0	Fallback disabled.
» %G1	Fallback enabled.

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Configuration
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
» \CO	Data is discarded.
\C1	Data is buffered.
\C2	Data is discarded, sets to normal mode and sends auto-reliable character to serial port.

AUTO-RETRAIN
Type:	Configuration
Format:	AT %En
Example:	AT %E1 <CR>
Description:	Selects auto-retrain mode.
Command	Function
%E0	Auto-retrain disabled.
» %E1	Auto-retrain enabled.
%E2	Do not hang up and auto-retrain disabled.

AUTO SLEEP TIMER
Format	AT [cmds] S46=n [cmds]
Example:	AT S46= 100<CR>
Default:	255
Range:	0 - 255
Unit:	.1 second.
Description:	Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode. 255 = disable.

BIT-MAPPED REGISTER S14
Format		AT [cmds] S14? [cmds]
Example:		ATS14?<CR>
Default:		Read only
Range:		0-174
Unit:		Bit-mapped.
Description:		Controls echo, result codes, result code display, dial mode, and answer/originate mode.
Bit	Value		Meaning
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]
Example:		ATS21?<CR>
Default:		Read only
Range:		0 - 124
Unit:		Bit-mapped.
Description:		Controls CTS, low DTR action, and DCD signal.
Bit	Value		Meaning
1, 0	00		Not used.
2	» 0 1		CTS follows RTS. Synchronous modes only. 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.

BIT-MAPPED REGISTER S22
Format		AT [cmds] S22? [cmds]
Example:		ATS22?<CR>
Default:		Read only
Range:		0 - 255
Unit:		Bit-mapped.
Description:		Controls volume and speaker settings, result codes, and make/break pulse ratio.
Bit	Value		Meaning
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	000 100 101 110 » 111		Busy and dialtone detection disabled. Busy and dialtone detection disabled. Busy tone detection disabled, dialtone detection enabled. Busy tone detection enabled, dialtone detection disabled. Busy and dialtone detection 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? [cmds]
Example:		ATS23?<CR>
Default:		Read only
Range:		0-241
Unit:		Bit-mapped.
Description:		Grants/denies remote digital loopback, controls parity, and sets guard tone.
Bit	Value		Meaning
0	0 » 1		Remote digital loopback denied. Remote digital loopback allowed.
3, 2, 1	000		Not used.
5,4	00 » 01 10 11		Parity even. Parity Space. Parity odd. Parity Mark.
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]
Example:		AT S27? <CR>
Default:		Read only
Range:		0 - 127
Unit:		Bit-mapped.
Description:		Selects sync/async mode, Line type, internal clock, 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, DTR dialing enabled. Asynchronous command mode on low DTR, synchronous connect mode on high DTR. Hayes AutoSync™ mode - serial port locked at 9600bps.
2	» 0 1		Dial up line. Leased line.
5, 4	» 00 01 10		Internal DTE transmit clock source. External DTE transmit clock source. Slave DTE transmit clock source.
6	0 » 1		CCITT mode. Bell mode.

BIT-MAPPED REGISTER S44
Format		AT [cmds] S44? [cmds]
Example:		AT S44? <CR>
Default:		Read only.
Range:		0-23
Unit:		Bit-mapped.
Description:		Selects V.42 status, V.42bis, and fallback.
Bit	Value		Meaning
0	0 » 1		V.42bis status disabled. V.42bis status enabled.
2, 1	00 01 10 » 11		V.42bis disabled. V.42bis when transmitting enabled. V.42bis when receiving enabled. V.42bis when transmitting/receiving enabled.
3	0		Not used.
4	0 » 1		Fallback disabled. Fallback enabled.

BIT-MAPPED REGISTER S51
Format		AT [cmds] S51? [cmds]
Example:		AT S51? <CR>
Default:		Read only.
Range:		0 - 115
Unit:		Bit-mapped.
Description:		Display flow control.
Bit	Value		Meaning
2, 1, 0	000 001 010 » 011		Flow control disabled. XON/XOFF flow control enabled. CTS flow control to DTE enabled. RTS/CTS flow control enabled.
3	0		Not used.
4	» 0 1		Flow control disabled. Flow control to XON/XOFF flow enabled.
5	» 0 1		Serial speed locked. Serial speed follows connect speed.
7, 6	» 00 01		XON/XOFF signals trapped by local modem. XON/XOFF passed through local modem.

BIT-MAPPED REGISTER S54
Format		AT [cmds] S54? [cmds]
Example:		AT S54? <CR>
Default:		Read only.
Range:		0 - 131
Unit:		Bit-mapped
Description:		Displays the communication protocol for data calls, and protocol result code.
Bit	Value		Meaning
0	0 1		B2 is enabled. B2 is not enabled.
1	0 1		B3 is enabled B3 is not enabled.
6 - 2	0		Not used.
7	0 1		Protocol result code disabled. Protocol result code enabled.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B3 &W<CR>
Range:	1-9
Unit:	100 ms.
Description:	Sends break to modem.

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	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.	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 DTE immediately.
\K3		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.	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.

COMPRESSION
Type:	Configuration
Format:	AT %Cn
Example:	AT *EC0 %C1 *AP0<CR>
Description:	Selects data compression.
Command	Function
%C0	Data compression disabled.
%C1	MNP 5 enabled.
%C2	V.42bis enabled.
» %C3	MNP 5 and V.42bis enabled.

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	LAP-M mode with fallback to MNP and normal modes enabled.
\N4	LAP-M mode with fallback to MNP enabled.
\N5	LAP-M mode only enabled.

CONNECT MODE
Type:	Configuration
Format:	AT [cmds] $En [cmds]
Example:	AT $E1 DT555-1212<CR>
Description:	Sets connect mode.
Command	Function
$E0	Normal mode enabled.
$E1	MNP mode with fallback to normal mode enabled.
$E2	MNP mode only enabled.
» $E3	LAP-M mode with fallback to MNP and normal modes enabled.
$E4	LAP-M mode only enabled.

DISPLAY AUTO-RELIABLE BUFFER
Type:	Register
Format:	AT [cmds] S48? [cmds]
Example:	AT S48? <CR>
Default:	Read only.
Description:	Displays auto-reliable buffer settings. (\Cn)
Value	Meaning
» 0	Data is discarded.
1	Data is buffered.
2	Data is discarded, modem returns to normal mode on receiving auto-reliable fallback character.

DISPLAY CONNECT MESSAGE
Type:	Register
Format	AT [cmds] S41? [cmds]
Example:	AT S41? <CR>
Default:	Read only.
Description:	Connect message display. (Wn)
Value	Meaning
» 0	Connect with DTE speed.
1	Connect with carrier, protocol, and compression.
2	Connect with DCE speed.

DISPLAY FAX/DATA MODE
Type:	Register
Format:	AT [cmds] S50? [cmds]
Example:	AT S50?<CR>
Default:	Read only.
Description:	Displays data or FAX mode.
Value	Meaning
» 0	Data mode enabled.
1	FAX mode enabled.

DISPLAY FLOW CONTROL TYPE
Type:	Register
Format:	AT [cmds] S52?[cmds]
Example:	AT S52?<CR>
Default:	Read only.
Description:	Displays type of flow control used by modem. (&Kn)
Value	Meaning
S52=0	Flow control disabled.
S52=1	Not used.
S52=2	Not used.
» S52=3	CTS/RTS flow control enabled.
S52=4	XON/XOFF pass-through flow control enabled.

DISPLAY MAXIMUM BLOCK SIZE
Type:	Register
Format:	AT [cmds] S49? [cmds]
Example:	AT S49?<CR>
Default:	Read only.
Description:	Displays maximum block size. (\An)
Value	Meaning
63	Maximum MNP block size is 64 characters.
127	Maximum MNP block size is 128 characters.
191	Maximum MNP block size is 192 characters.
» 255	Maximum MNP block size is 256 characters.
31	Maximum MNP block size is 32 characters.

DISPLAY MODEM OPERATING MODE
Type:	Register
Format:	AT [cmds] S53? [cmds]
Example:	AT S53? <CR>
Default:	Read only.
Description:	Displays connect mode. (\Nn)
Value	Meaning
0	Normal mode enabled.
1	Direct mode enabled.
2	MNP reliable mode enabled.
4	LAP-M mode enabled.
6	LAP-M mode with fallback to MNP enabled.
» 7	LAP-M, MNP, or Normal mode enabled.

DISPLAY MNP OPTIONS
Format	AT [cmds] S59? [cmds]
Example:	AT S59?<CR>
Default:	Read only.
Description:	Displays MNP5 status. (%Cn)
Value	Meaning
0	Data compression disabled.
1	MNP 5 enabled.
2	V.42bis enabled.
» 3	MNP 5 and V.42bis enabled.

DISPLAY PROTOCOL - V.42 DETECTION
Format		AT [cmds] S40? [cmds]
Example:		AT S40? <CR>
Default:		Read-only
Range:		0-65
Unit:		Bit-mapped.
Description:		Controls active protocols and V.42 detection. (Nn and -Jn)
Bit	Value		Meaning
0	0 » 1		Automatic mode-detection disabled In originate mode, handshake begins at line speed designated by the S37 register. Modem can shift to a slower speed if necessary. In answer mode, handshake attempted with the following protocols in order - V.32terbo, V.32bis, V.32, V.22bis, V.22 or Bell 212, V.21, and Bell 103
5 - 1	0		Not used.
6	0 » 1		V.42 detection disabled. V.42 detection enabled.

DISPLAY V.32 RETRAIN
Type:	Register
Format:	AT [cmds] S42?[cmds]
Example:	AT S42? <CR>
Default:	Read only.
Description:	Selects action the modem will take during bad line quality on V.32/32bis connection. (%En)
Value	Meaning
0	Auto-retrain disabled, hang up.
1	Auto-retrain on line quality problem enabled.
2	Modem ignores line quality problems.

DTE RATE STATUS
Type:	Register
Format:	AT [cmds] S62? [cmds]
Example:	AT S62? <CR>
Default:	Read only.
Description:	Displays DTE rate.
Value	Meaning
0	300 bps.
1	600 bps.
2	1200 bps.
3	2400 bps.
4	4800 bps.
5	7200 bps.
6	9600 bps.
7	12Kbps.
8	14.4Kbps.
9	16.8Kbps.
10	19.2Kbps.
11	21.6Kbps.
12	24Kbps.
13	26.4Kbps.
14	28.8Kbps.
15	38.4Kbps.
» 16	57.6Kbps.
17	115.2Kbps.

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 \Q0 A <CR>
Description:	Sets type of flow control used by modem.
Command	Function
\Q0	Flow control disabled.
\Q1	XON/XOFF flow control enabled.
\Q2	CTS flow control to DTE enabled.
» \Q3	RTS/CTS flow control enabled.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] $Fn [cmds]
Example:	AT &G1 $F3 <CR>
Description:	Sets type of flow control used by modem.
Command	Function
$F0	XON/XOFF flow control enabled.
$F1	XON/XOFF pass-through flow control enabled.
» $F4	CTS/RTS flow control enabled.
$F5	Flow control disabled.

INACTIVITY TIMER
Type:	Configuration
Format:	AT [cmds] \Tn [cmds]
Example:	AT\T20<CR>
Default:	0
Range:	1-90
Unit:	1 minute.
Description:	Sets the length of time that the modem does not receive information before it disconnects. \T0 disables the timer.

LOCAL SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] S72=n [cmds]
Example:	AT S72=00 *OS0 *SC1<CR>
Description:	Sets serial port speed.
Command	Function
» S72=0	Sets speed automatically.
S72=1	Sets 300bps speed.
S72=2	Sets 600bps speed.
S72=3	Sets 1200bps speed.
S72=4	Sets 2400bps speed.
S72=5	Sets 4800bps speed.
S72=6	Sets 7200bps speed.
S72=7	Sets 9600bps speed.
S72=8	Sets 12Kbps speed.
S72=9	Sets 14.4Kbps speed.
S72=10	Sets 16.8Kbps speed.
S72=11	Sets 19.2Kbps speed.
S72=12	Sets 21.6Kbps speed.
S72=13	Sets 24Kbps speed.
S72=14	Sets 26.4Kbps speed.
S72=15	Sets 28.8Kbps speed.
S72=16	Sets 38.4Kbps speed.
S72=17	Sets 57.6Kbps speed.
S72=18	Sets 115.2Kbps 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 TESTS
Format		AT [cmds] S16=n [cmds]
Example:		ATS16=32<CR>
Default:		0
Range:		0 - 125
Unit:		Bit-mapped.
Description:		Enables loopback tests.
Bit	Value		Function
0	» 0 1		Local analog loopback test disabled. Local analog loopback test enabled.
1	0		Not used.
2	» 0 1		Local digital loopback test disabled. Local digital loopback test enabled.
3	» 0 1		Modem is not performing remote digital loopback test. Modem is performing remote digital loopback test.
4	» 0 1		Remote digital loopback test disabled. Remote digital loopback test enabled.
5	» 0 1		Remote digital loopback with local self-test disabled. Remote digital loopback with local self-test enabled.
6	» 0 1		Local analog loopback with local self-test disabled. Local analog loopback with local self-test enabled.

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Configuration
Format:	AT [cmds] \An [cmds]
Example:	AT \A3 &MB28800<CR>
Description:	Sets the maximum transmittable block size.
Command	Function
\A0	Maximum MNP block size is 64 characters.
\A1	Maximum MNP block size is 128 characters.
\A2	Maximum MNP block size is 192 characters.
» \A3	Maximum MNP block size is 256 characters.
\A4	Maximum MNP block size is 32 characters.

PROTOCOL RESULT CODE
Type:	Configuration
Format:	AT [cmds] \Vn [cmds]
Example:	AT \V0 Q0 <CR>
Description:	\V responds when conjunction with W0 and W2 commands.
Command	Function
\V1	Protocol result code disabled.
» \V0	Protocol result code enabled.

PROTOCOL/SPEED
Type:	Register
Format:	AT [cmds] S37n [cmds]
Example:	AT S37=00 <CR>
Description:	Selects the current DCE speed.
Value	Meaning
» S37=0	Select last ATspeed.
S37=3	Select 300bps speed.
S37=5	Select 1200bps speed.
S37=6	Select 2400bps speed.
S37=7	Select 4800bps speed.
S37=8	Select 7200bps speed.
S37=9	Select 9600bps speed.
S37=10	Select 12Kbps speed.
S37=11	Select 14.4Kbps speed.
S37=12	Select 16.8Kbps speed.
S37=13	Select 19.2Kbps speed.
S37=14	Select 21.6Kbps speed.
S37=15	Select 24Kbps speed.
S37=16	Select 26.4Kbps speed.
S37=17	Select 28.8Kbps speed.

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 3-digit ROM checksum result.
I2	Reports OK.
I3	Reports firmware version.
I4	Reports OEM string.
I5	Reports country code.
I9	Reports checksum result of Flash-ROM.

ROUND TRIP DELAY
Type:	Register
Format:	AT [cmds] S65? [cmds]
Example:	AT S65? <CR>
Default:	Read only.
Units:	.1 second.
Description:	Displays the round trip delay.

V.42 DETECTION PHASE
Type:	Configuration
Format:	AT [cmds] -Jn [cmds]
Example:	AT -J1 &W<CR>
Description:	Controls V.42 detection.
Command	Function
-J0	V.42 detection disabled.
» -J1	V.42 detection enabled.

V.42bis COMPRESSION CONTROL
Type:	Configuration
Format:	AT [cmds] "Hn [cmds]
Example:	AT "H3 &W<CR>
Description:	Controls V.42bis data compression.
Command	Function
"H0	V.42bis disabled.
"H1	V.42bis when transmitting enabled.
"H2	V.42bis when receiving enabled.
» "H3	V.42bis when transmitting/receiving enabled.

V.42bis DICTIONARY SIZE
Type:	Configuration
Format:	AT [cmds] "Nn [cmds]
Example:	AT "N2 &W<CR>
Description:	Controls V.42 dictionary size.
Command	Function
"N0	512 bytes.
"N1	1024 bytes.
» "N2	1536 bytes.

V.42bis DICTIONARY SIZE
Type:	Register
Format:	AT [cmds] S57? [cmds]
Example:	AT S57? <CR>
Default:	Read only.
Description:	Displays V.42bis dictionary size. ("Nn)
Value	Meaning
0	512 bytes.
1	1024 bytes.
» 2	1536 bytes.

V.42bis MAXIMUM STRING LENGTH
Type:	Immediate
Format:	AT [cmds] "On [cmds]
Example:	AT "O32 <CR>
Default:	32
Range:	6 - 64
Unit:	Unidentified.
Description:	Selects string size for V.42bis compression.

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.