Card Type	Fax, Modem (asynchronous, synchronous)
Chip Set	U.S. Robotics
Maximum Data Rate	28.8Kbps
Maximum Fax Rate	14.4Kbps
Data Bus	8-bit ISA
Fax Class	Class I & II
Data Modulation Protocol	Bell 103/212A ITU-T V.21, V.22, V.22bis, V.23, V.25bis, V.32, V.32bis, V.34 Rockwell V.FC U.S. Robotics HST, V.32terbo
Fax Modulation Protocol	ITU-T V.17, V.21, V.27ter, V.29
Error Correction/Compression	HST, MNP5, V.42, V.42bis

CONNECTIONS
Function	Label		Function		Label
Line out		CN1		Line in		CN2

USER CONFIGURABLE SETTINGS
Setting	Label	Position
í DTR normal	SW1/A	Off
DTR forced high	SW1/A	On
í Verbose (word) format enabled	SW1/B	Off
Numeric format enabled	SW1/B	On
í Result code display enabled	SW1/C	On
Result code display disabled	SW1/C	Off
í Local echo enabled	SW1/D	Off
Local echo disabled	SW1/D	On
í Auto-answer disabled	SW1/E	On
Auto-answer enabled, off-hook on first ring	SW1/E	Off
í CD normal	SW1/F	Off
CD forced high	SW1/F	On
í Result code display enabled in both originate and answer mode	SW1/G	Off
Result code display enabled in originate mode only	SW1/G	On
í Smart mode	SW1/H	On
Dumb mode	SW1/H	Off
í Escape code response: modem goes on-hook, off-line command mode, returns ‘NO CARRIER’	SW1/I	Off
Escape code response: modem stays on-line, on-line command mode, returns ‘OK’	SW1/I	On
í Reset and load from profiles in NVRAM	SW1/J	Off
Reset and load from factory settings in ROM	SW1/J	On

SERIAL PORT ADDRESS
Setting	JP1/A	JP1/B	JP1/C	JP1/D
COM1 (3F8h)	Closed	Open	Open	Open
COM2 (2F8h)	Open	Closed	Open	Open
COM3 (3E8h)	Open	Open	Closed	Open
COM4 (2E8h)	Open	Open	Open	Closed

INTERRUPT SELECTION
Setting	JP2/A	JP2/B	JP2/C	JP2/D	JP2/E
2	Closed	Open	Open	Open	Open
3	Open	Closed	Open	Open	Open
4	Open	Open	Closed	Open	Open
5	Open	Open	Open	Closed	Open
7	Open	Open	Open	Open	Closed

ABORT
Type:	Immediate
Format:	Any key
Description:	Aborts answering/originating a call; modem hangs up.

ACCOUNT ACCESS
Type:	Immediate
Format:	AT%S=n <cr>
Description:	Acquire access to security accounts without disabling security. (n= local access password)

ANSWER
Type:	Immediate
Format:	AT [cmds] A
Description:	Enables answer mode; the modem goes off-hook.

ANSWER SEQUENCE
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Description:	Selects the answer sequence the modem will use
Command	Function
í B0	ITU-T answer sequence enabled
B1	Bell answer sequence enabled, required for all HST Cellular calls.

ATTENTION
Type:	Immediate
Format:	AT [cmds]
Description:	Tells the modem that a command follows or use alone to test OK result code

BIT-MAPPED REGISTER S54
Format:		AT [cmds] S54=n [cmds]
Default:		0
Range:		0-255
Unit:		Bit-mapped
Description:		Controls call indicate during V.34 operation and V.8 during V.34 operation.
Bit	Value	Function
5 - 0	000000	Not used
6	í 0 1	Call indicate during V.34 operation enabled Call indicate during V.34 operation disabled
7	í 0 1	V.8 during V.34 operation enabled V.8 during V.34 operation disabled

BIT-MAPPED REGISTER S13
Format		AT [cmds] S13=n [cmds]
Default:		0
Range:		0-255
Unit:		Bit-mapped
Description:		Controls DTR reset, reverse operations, reset dialing, HST, MNP3, and custom applications.
Bit	Value	Function
0	í 0 1	DTR normal Reset on low DTR
1	í 0 1	Normal auto answer operation When ring is received, enter originate and listen for answer tone
2	í 0 1	Immediate result code display Pause 250msec before displaying result codes
3	í 0 1	DTR dialing disabled DTR dialing enabled
4	í 0 1	Reset dialing disabled Reset dialing enabled
5	í 0 1	Enable HST Disable HST (used for testing V.32terbo in Dual Standard modems)
6	í 0 1	MNP 3 enabled MNP 3 disabled
7	í 0 1	Custom applications Custom applications

BIT-MAPPED REGISTER S14
Format:			AT [cmds] S14=n [cmds]
Default:			0
Range:			0-255
Description:			Controls disconnect, and retrain
Bit	Value			Function
0	í 0 1			Normal operation Disconnect on escape code
6 - 1		000000			Not used
7		í 0 1			Enable retrain Disable retrain

BIT-MAPPED REGISTER S15
Format:		AT [cmds] S15=n [cmds]
Default:		0
Range:		0-255
Unit:		Bit-mapped
Description:		Controls HST high frequency equalization, online fallback, back channel, non-error-correcting mode buffer, MNP4, BS/DEL switch, MNP compliance, and custom applications.
Bit	Value	Function
0	í 0 1	HST high frequency equalization enabled HST high frequency equalization disabled
1	í 0 1	Online fallback enabled Online fallback disabled
2	í 0 1	450bps back channel enabled 450bps back channel disabled
3	í 0 1	Non-error-correcting mode transmit buffer set to 1.5KB Non-error-correcting mode transmit buffer set to 128 bytes
4	í 0 1	MNP 4 enabled MNP 4 disabled
5	í 0 1	Use backspace key for delete disabled Use backspace key for delete enabled
6	í 0 1	MNP normal MNP adjusted for non-compliant modems
7	í 0 1	Custom applications Custom applications

BIT-MAPPED REGISTER S27
Format:		AT [cmds] S27=n [cmds]
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	í 0 1	V.21 disabled V.21 enabled
1	í 0 1	V.32 non-trellis coding disabled V.32 non-trellis coding enabled
2	í 0 1	V.32 modulation enabled V.32 modulation disabled
3	í 0 1	2100Hz answer tone enabled 2100Hz answer tone disabled; allows V.42 modems to connect quicker.
5, 4	í 00 01 10 11	V.42 detect, LAPM and MNP enabled V.42 detect and LAPM enabled MNP enabled LAPM enabled
6	í 0	Not used
7	í 0 1	Actual result codes displayed Force 9600 result codes

BIT-MAPPED REGISTER S34
Format:		AT [cmds] S34=n [cmds]
Default:		0
Range:		0-255
Unit:		Bit-mapped
Description:		Controls V.32bis/V.32terbo modulations, LED selection, MI/MIC, and remote access busy message.
Bit	Value	Function
0	í 0 1	V.32bis enabled V.32bis disabled
1	í 0 1	Enhanced V.32bis enabled Enhanced V.32bis disabled
2	í 0 1	V.32terbo fast retrain enabled V.32terbo fast retrain disabled
3	í0 1	V.23 modulation disabled V.23 modulation enabled
4	í 0 1	Change MR LED to DSR disabled Change MR LED to DSR enabled
5	í 0 1	MI/MIC disabled MI/MIC enabled
6	í 0 1	Remote access busy message enabled Remote access busy message disabled
7	í 0 1	V.32terbo enabled V.32terbo disabled

BIT-MAPPED REGISTER S56
Format:			AT [cmds] S56=n [cmds]
Default:			0
Range:			0-192
Description:			Controls enable/disable V.34 and V.FC.
Bit	Value			Function
5 - 0	000000			Not used
6		í 0 1			V.34 enabled V.34 disabled
7		í 0 1			V.FC enabled V.FC disabled

BREAK LENGTH
Type:	Register
Format:	AT [cmds] S21=n [cmds]
Default:	10
Range:	0-255
Unit:	.01 second
Description:	Sets the length of error control mode breaks sent from DCE to DTE.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] &Yn [cmds]
Description:	Configures action of break signal
Command	Function
&Y0	Empty buffer only
í &Y1	Empties buffer and break is sent immediately
&Y2	Do not empty buffer and break is sent immediately
&Y3	Do not empty buffer and send break along with transmitted data

CARRIER DETECT (CD)
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Description:	Sets the CD signal
Note: Modem controls CD signal by the SW1/F setting, AT&Cn not saved in NVRAM. (External models only)
Command	Function
&C0	CD signal forced high
&C1	CD signal normal

CLOCK SOURCE - SYNCHRONOUS TRANSMIT
Type:	Configuration
Format:	AT [cmds] &Xn [cmds]
Description:	Selects DTE transmit clock source
Command	Function
í &X0	Modem generates clock
&X1	DTE generates clock
&X2	Modem generates clock from the receive carrier signal

COMPRESSION
Type:	Configuration
Format:	AT [cmds] &Kn [cmds]
Description:	Selects data compression
Command	Function
&K0	Data compression disabled
í &K1	Auto enabled/disable data compression
&K2	Data compression enabled
&K3	V.42bis data compression only enabled

COMPRESSION AND ERROR CORRECTION
Type:		Register
Format		AT [cmds] S51=n [cmds]
Default:		0
Range:		0-7
Unit:		Bit-mapped
Description:		Selects compression and error correction for specific modulations, and controls handset exclusion delay
Bit	Value	Function
0	í 0 1	MNP/V.42 disabled during V.22 operation MNP/V.42 disabled during V.22 operation
1	í 0 1	MNP/V.42 disabled during V.22bis operation MNP/V.42 disabled during V.22bis operation
2	í 0 1	MNP/V.42 disabled during V.32/V.32bis/V.32terbo operation MNP/V.42 disabled during V.32/V.32bis/V.32terbo operation
7	í 0 1	Handset exclusion delay disabled Handset exclusion delay enabled

CONNECTION SPEED
Type:	Configuration
Format:	AT [cmds] &Nn [cmds]
Description:	Sets connection speed, variable or fixed.
Command	Function
í &N0	Variable
&N1	300bps
&N2	1200bps
&N3	2400bps
&N4	4800bps
&N5	7200bps
&N6	9600bps
&N7	12Kbps
&N8	14.4Kbps
&N9	16.8Kbps (HST, V.32terbo, V.34 and V.FC only)
&N10	19.2Kbps (V.32terbo, V.34 and V.FC only)
&N11	21.6Kbps (V.32terbo, V.34 and V.FC only)
&N12	24Kbps (V.34 and V.FC only)
&N13	26.4Kbps (V.34 and V.FC only)
&N14	28.8Kbps (V.34 and V.FC only)

DATA SET READY (DSR)
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Description:	Selects DSR options
Command	Function
í &S0	DSR forced high
&S1	DSR high only while modem is handshaking or connected
&S2	DSR toggled on loss of CD signal with CTS following CD signal
&S3	DSR toggled on loss of CD signal without CTS following CD signal
&S4	DSR and CD signals are sent to DTE at the same time

DATA SET READY (DSR) - PULSED SIGNAL
Type:	Register
Format:	AT [cmds] S24=n [cmds]
Default:	150
Range:	0-255
Unit:	.02 second
Description:	Sets the length of time between DSR on/off when the modem is set to &S2 or &S3.

DATA TERMINAL READY (DTR)
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Description:	Selects modem response to DTR
Command	Function
&D0	Modem does not respond to DTR, DTR signal forced high
&D1	Modem goes to command mode after DTR toggles
&D2	Modem uses DTR as normal

DETECT TONE
Type:	Immediate
Format:	AT [cmds] %T [cmds]
Description:	Enables the modem to detect tone frequencies of dialing modems. Used primarily for network applications. To enable, ATH1<cr> then AT%T. To disabled, press any key.

DIAL
Type:	Immediate
Format:	AT [cmds] D<#> [cmds]
Example:	ATDT 443-3388,,,1111;
Description:	Dials telephone number according to any modifiers included in the string
Note:	Any combination of modifiers can be used to produce the desired dial functions in sequence.
Modifier	Function
í P	Pulse dialing enabled
T	Tone dialing enabled
,	Dialing paused for 2 seconds to a maximum amount of time specified in S8 register
;	Modem returned to command state after dialing. Can only be placed at the end of the dial command.
"	Dials letters that follow, ATDT"GOMICRO
!	Flash function initiated
W	Dialing resumed following dial tone detection
@	Wait for quiet answer, then proceeds to execute the rest of the dial string.
/	125 msec delay before proceeding with dial string
R	Answer mode enabled; originate mode disabled following handshake initiation.

DIAL - LAST NUMBER
Type:	Immediate
Format:	AT [cmds] DL [cmds]
Description:	Re-dial last number dialed
Note: Use ATDL instead of A/ if you need to use commands other than the dial command.

DIAL - STORED NUMBER
Type:	Immediate
Format:	AT [cmds] DSn [cmds]
Description:	Dial stored number from memory location n. (n=0-9)

DISCONNECT BUFFER DELAY
Type:	Register
Format	AT [cmds] S38=n [cmds]
Default:	0
Range:	0-255
Unit:	1 second
Description:	Sets maximum duration allowed during buffered data calls for modem to perform clearing functions after losing carrier-signal or receiving a clear call signal from the remote modem and before initiating hang-up process. A value of 0 allows the modem to hang-up immediately.

DTR CHANGE THRESHOLD
Type:	Register
Format	AT [cmds] S25=n [cmds]
Default:	5
Range:	0-255
Unit:	.01 second
Description:	Sets maximum time a change in the DTR signal will be ignored

ECHO
Type:	Configuration
Format:	AT [cmds] En [cmds]
Description:	Controls echo function; display keyboard commands when enabled.
Command	Function
E0	Echo function disabled
E1	Echo function enabled

ECHO - ON-LINE
Type:	Configuration
Format:	AT [cmds] Fn [cmds]
Description:	Selects whether commands sent while in data mode are echoed
Command	Function
F0	Local echo enabled
í F1	Local echo disabled

EDIT - SECURITY SYSTEMS
Type:	Immediate
Format:	AT [cmds] %E=n [cmds]
Description:	Clears chosen field or password
Command		Function
%E=1		Clear local access password
%E=2		Clear auto-pass password
%E=3		Clear passwords in accounts 0-9
%E=4		Clear phone numbers in accounts 0-9
%E=5		Disable account, dial-back, and new number fields in accounts 0-9

ERROR CORRECTION MODE (ARQ)
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects active error correction protocols
Command	Function
&M0	Normal mode only
&M1	On-line synchronous mode without V.25bis
í &M4	Auto-detect mode
&M5	ARQ mode only
&M6	V.25bis on-line synchronous mode with a protocol link similar to BISYNC
&M7	V.25bis on-line synchronous mode with HDLC protocol link

ESCAPE SEQUENCE
Type:	Immediate
Format:	+++AT [cmds] <CR>
Description:	Initiates the escape sequence and returns the modem to the on-line command state if it receives three escape characters set in S2 within the time allotted by S12.
Note:	Do not precede this command with AT.

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] &An [cmds]
Description:	Selects extended result codes
Command	Function
&A0	Extended result codes disabled
&A1	ARQ result codes enabled
&A2	V.32, HST, V.34 or V.FC result code enabled
í &A3	Error control and compression result codes enabled

FACTORY DEFAULT PROFILE
Type:	Configuration
Format:	AT [cmds] &Fn [cmds]
Description:	Sets values in active profile to values found in the default profile
Command		Function
&F0		No flow control template
í &F1		Hardware flow control template
&F2		Software flow control template
&F3		HST Cellular template

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

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

FLOW CONTROL PASSTHROUGH
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Description:	Allows modem to act on, then transmit XON/XOFF characters.
Command	Function
í &I0	Software flow control disabled
&I1	XON/XOFF passthrough enabled
&I2	XON/XOFF passthrough disabled
&I3	ENQ/ACK enabled in host mode
&I4	ENQ/ACK enabled in terminal mode
&I5	XON/XOFF passthrough disabled in error correction mode

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

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] &Rn [cmds]
Description:	Controls receive data hardware flow control and RTS signals
Command	Function
&R0	Delay CTS response after RTS signal (RTS/CTS delay)
&R1	Modem ignores RTS
í &R2	Received data to DTE when RTS is on

GUARD TONE
Type:	Configuration
Format:	AT [cmds] &Gn [cmds]
Description:	Commands the modem to transmit a guard tone in V.22/V.22bis mode
Note: Used primarily for international data transmission
Command	Function
í &G0	Guard tone disabled
&G1	550Hz guard tone enabled
&G2	1800Hz guard tone enabled

HOOK CONTROL
Type:	Immediate
Format:	AT [cmds] Hn [cmds]
Description:	Selects whether the modem is on-hook or off-hook
Command	Function
H0	Modem commanded to go on-hook (hang-up)
H1	Modem commanded to go off-hook (pick-up)

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] S19=n [cmds]
Default:	0
Range:	0-255
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects. S19=0 will disable.

LEASED-LINE RECONNECT
Type:	Register
Format:	AT [cmds] S44=n [cmds]
Default:	15
Range:	0-255
Unit:	1 second
Description:	Sets the time when the modem will reconnect in leased-line mode when it detects a loss of carrier.

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Description:	Selects line type
Command	Line Type
í &L0	Switched line (PSTN/Dial-up)
&L1	Leased-line
&L2	Cellular operation

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

MAPPING
Type:			Register
Format:			AT [cmds] S55=n [cmds]
Default:			0
Range:			0-15
Description:			Controls all Map options
Bit	Value			Function
0	í 0 1			8S-2D map enabled 8S-2D map disabled
1		í 0 1			16S-4D map enabled 16S-4D map disabled
2		í 0 1			32S-2D map enabled 32S-2D map disabled
3		í 0 1			64S-4D map enabled 64S-4D map disabled

ON-LINE
Type:	Immediate
Format:	AT [cmds] On [cmds]
Description:	Controls on-line command (data transmission) mode options.
Note: The O command must be placed at the end of the command string.
Command	Function
O0	On-line command mode with no retraining enabled
O1	On-line command mode with retraining enabled

PACKET SIZE - REDUCE
Type:	Register
Format:	AT [cmds] S33=n [cmds]
Description:	Reduces the size of the packets being sent
Command		Function
í S33=0		Reduce packet size disabled
S33=1		Reduce packet size enabled

PASSWORD - ASSIGNMENT
Type:	Configuration
Format:	AT [cmds] %L=n [cmds]
Description:	Assign an account password as the local access password.

PASSWORD - AUTO-PASS
Type:	Configuration
Format:	AT [cmds] %V=PWn [cmds]
Description:	Make the password in account n as your auto-pass password

PASSWORD - SECURITY
Type:	Configuration
Format:	AT [cmds] %Pn=x [cmds]
Description:	Sets, views or disables password security
Command		Function
%Pn=		Disable password security (%Pn=0 or 1)
%Pn=x		Viewing privileges only (n=0), Viewing and configuration privileges (n=1) for specified password string (x).
%Pn?		Display password n

PULSE DIALING RATIO
Type:	Configuration
Format:	AT [cmds] &Pn [cmds]
Description:	Selects pulse dial make/break ratio
Command	Function
í &P0	39/61ms at 10pps (North America)
&P1	33/67ms at 10pps (Europe)

REMOTE ACCESS - ESCAPE CHARACTER
Type:	Register
Format:	AT [cmds] S42=n [cmds]
Default:	126
Range:	0-255
Unit:	ASCII
Description:	Controls the remote access escape character, default character (~) Tilde.

REMOTE ACCESS - LOG-IN ATTEMPTS
Type:	Register
Format:	AT [cmds] S41=n [cmds]
Default:	0
Range:	0-255
Unit:	1 attempt
Description:	Sets the number of remote access log-in attempts. S41=0 disables and doesn’t allow remote access.

REMOTE ACCESS - SEQUENCE
Type:	Register
Format:	AT [cmds] S43=n [cmds]
Default:	200
Range:	0-255
Unit:	.02 second
Description:	Sets the guard time for the remote access sequence, (~~~~).

REMOTE CONFIGURATION CONTROL
Type:	Configuration
Format:	AT [cmds] %Cn [cmds]
Description:	Sets how the modem will react to remote configuration changes
Command		Function
í C0		Remote configuration changes are deferred, this ensures that connections are made.
C1		Remote configuration changes are restored, restore original configuration after remote access.
C2		Remote configuration changes are effected immediately, changes are made now.

REMOTE CONFIGURATION - DATA FORMAT
Type:	Configuration
Format:	AT [cmds] %Fn [cmds]
Description:	Sets parity
Command		Function
%F0		No Parity, 8 data bits
%F1		Mark Parity, 7 data bits
%F2		Odd Parity, 7 data bits
%F3		Even Parity, 7 data bits

REMOTE CONFIGURATION - SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] %Bn [cmds]
Description:	Remotely configures the serial port speed
Command		Function
%B0		Set serial port speed to 110Kbps
%B1		Set serial port speed to 300Kbps
%B2		Set serial port speed to 600bps
%B3		Set serial port speed to 1200bps
%B4		Set serial port speed to 2400bps
%B5		Set serial port speed to 4800bps
%B6		Set serial port speed to 9600bps
%B7		Set serial port speed to 19.2Kbps
%B8		Set serial port speed to 38.4Kbps
%B9		Set serial port speed to 57.6Kbps
%B10		Set serial port speed to 115.2Kbps

REMOTE CONFIGURATION - V.25bis CLOCK SPEED
Type:	Configuration
Format:	AT [cmds] %Nn [cmds]
Description:	Sets the terminal to modem V.25bis clock speed
Command		Function
%N0		Not used
%N1		Not used
%N2		Set clock speed to 1200bps
%N3		Set clock speed to 2400bps
%N4		Set clock speed to 4800bps
%N5		Set clock speed to 7200bps
í %N6		Set clock speed to 9600bps
%N7		Set clock speed to 12Kbps
%N8		Set clock speed to 14.4Kbps
%N9		Set clock speed to 16.8Kbps
%N10		Set clock speed to 19.2Kbps

REPEAT COMMAND STRING
Type:	Configuration
Format:	AT [cmds] > [cmds]
Description:	Causes modem to repeat command string until a keyboard key is pressed

REPEAT DIAL STRING
Type:	Immediate
Format:	A>
Description:	Repeat mode enabled and the dial string last executed will be carried out until a connection is established or 10 attempts made.
Note:	Do not precede this command with AT, or follow it with <CR>.

REPEAT PREVIOUS COMMAND
Type:	Immediate