Card Type	Fax, Modem (asynchronous)
Chip Set	U.S. Robotics
Maximum Data Rate	28.8Kbps
Maximum Fax Rate	14.4Kbps
Data Bus	Unidentified
Fax Class	Unidentified
Data Modulation Protocol	Bell 103/212A ITU-T V.21, V.22, V.22bis, V.32, V.32bis, V.32terbo
Fax Modulation Protocol	Unidentified
Error Correction/Compression	MNP5, V.42, V.42bis

USER CONFIGURABLE SETTINGS
Setting	Label	Position
í DTR normal	SW1/1	Off
DTR forced high	SW1/1	On
í Verbal result codes	SW1/2	Off
Numeric result codes	SW1/2	On
í Enable result codes displayed	SW1/3	On
Disable result codes displayed	SW1/3	Off
í Local echo enabled	SW1/4	Off
Local echo disabled	SW1/4	On
í Auto answer disabled	SW1/5	On
Auto answer enabled	SW1/5	Off
í CD signal normal	SW1/6	Off
CD signal forced high	SW1/6	On
í Result codes displayed during both answer and originate mode	SW1/7	Off
Result codes displayed in originate mode only	SW1/7	On
í Smart mode enabled	SW1/8	On
Dumb mode enabled	SW1/8	Off
í Normal operation enabled	SW1/9	On
Escape sequence enabled	SW1/9	Off
í Restore NVRAM defaults	SW1/10	Off
Restore factory defaults	SW1/10	On

SEND/RECEIVE PIN ASSIGNMENT
Setting	Quad Switch
í Normal	Off
Not used	On

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

ANSWER
Type:	Immediate
Format:	AT [cmds] A
Description:	Enables manual answer mode, the modem goes off-hook; pressing any key will abort.

ANSWER SEQUENCE
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Description:	Selects the answer sequence the modem will use
Command	Function
í B0	V.32 mode/ITU-T answer sequence enabled
B1	HST mode/Bell answer tone enabled

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

BIT MAPPED REGISTERS
Register	Default
S51	0

BIT-MAPPED REGISTER S13
Format		AT [cmds] S13=n [cmds]
Default:		0
Range:		0-255
Unit:		Bit-mapped
Description:		Controls DTR reset, DTR dialing, reset dialing, HST modulation, and MNP3.
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	Pause 250msec. Before displaying result codes Immediate result code display
3	í 0 1	DTR dialing disabled DTR dialing enabled
4	í 0 1	Reset dialing disabled Reset dialing enabled
5	í 0 1	HST modulation enabled HST modulation disabled
6	í 0 1	MNP 3 enabled MNP 3 disabled
7	í 0 1	Hardware reset disabled Hardware reset enabled

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	300bps back channel enabled 300bps 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 only disabled Custom applications only enabled

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 Unusual software incompatibility.
Bit	Value	Function
0	í 0 1	V.21 disabled V.21 enabled
1	í 0 1	V.32 trellis coding disabled V.32 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
4	í 0 1	MNP handshake enabled MNP handshake disabled
5	í 0 1	V.42 detection phase enabled V.42 detection phase disabled
6	í 0	Not used
7	í 0 1	Unusual software incompatibility disabled Unusual software incompatibility enabled

BIT-MAPPED REGISTER S32
Format		AT [cmds] S34=n [cmds]
Default:		0
Range:		0-63
Unit:		Bit-mapped
Description:		Controls V.23/V.32/V.32bis modulations. Change LED and enable MI/MIC.
Bit	Value	Function
0	í 0 1	V.32bis enabled V.32bis disabled
1	í 0 1	Enhanced V.32 enabled Enhanced V.32 disabled
2	í 0 1	Quick V.32 retrain enabled Quick V.32 retrain disabled
3	í 0 1	V.23 disabled V.23 enabled
4	í 0 1	Do not change MR LED to represent DSR Change MR LED to represent DSR
5	í 0 1	Disable MI/MIC Enable MI/MIC

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 or send break

CARRIER DETECT (CD)
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Description:	Controls the CD signal
Command	Function
&C0	Modem does not respond to CD signal
í &C1	CD signal normal

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 enabled

CONNECTION SPEED
Type:	Configuration
Format:	AT [cmds] &Nn [cmds]
Description:	Sets required connection speed, modem will hang up if it cannot connect.
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
&N10	21.6Kbps

DATA SET READY (DSR)
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Description:	Selects DSR options
Command	Function
í &S0	DSR forced high
&S1	DSR controlled by modem
&S2	DSR toggled, CTS follows CD
&S3	DSR toggled
&S4	Modem sends DTE DSR signal following CD signal

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
&D1	Modem goes to command mode after DTR toggles
í &D2	Modem uses DTR as normal

CTS/RTS - DELAY
Type:	Configuration
Format:	AT [cmds] S26=n [cmds]
Default:	1
Range:	0-255
Unit:	.1 second
Description:	Sets the length of time between RTS and CTS signal sending

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.
Command	Function
í P	Pulse dialing enabled
T	Tone dialing enabled
,	Dialing paused for 2 seconds
;	Modem returned to command state after dialing. Can only be placed at the end of the dial command.
"	Dials letters as if they were numbers; ATDT"GOMICRO"
!	Flash function initiated
@	Dial, wait for quiet answer, then continue to execute the rest of the dial string
W	Dial, wait for second dial tone, then continue to execute the rest of the 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

DIAL - STORED NUMBER
Type:	Immediate
Format:	AT [cmds] DSn [cmds]
Description:	Dial stored number from memory location n

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 will allow the modem to hanging-up after DTR drops.

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

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

ERROR CORRECTION MODE (ARQ)
Type:	Configuration
Format:	AT [cmds] &Mn [cmds]
Description:	Selects active error correction protocols
Command	Function
&M0	Normal mode only
&M1	Asynchronous command mode and synchronous data mode
í &M4	Normal/ARQ mode
&M5	ARQ mode only
&M6	Character-oriented synchronous
&M7	HDLC synchronous

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 COMMAND SET
Type:	Immediate
Format:	AT <prefix>
Description:	Shows command help screens for all commands beginning with the given prefix.
Command	Function
&	Shows AT& extended command set
%	Shows AT% extended command set

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	ARQ result codes enabled and V.32 result code added
í &A3	Error control and compression result codes enabled

FACTORY DEFAULT PROFILE
Type:	Configuration
Format:	AT [cmds] &Fn [cmds]
Description:	Loads factory profile into non-volatile memory

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 PASS-THROUGH
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 after RTS. See S26 on length of time.
&R1	Modem ignores RTS
í &R2	Received data to DTE when RTS is on

GUARD TIME
Type:	Register
Format:	AT [cmds] S43=n [cmds]
Default:	100
Range:	0-255
Unit:	.02 second
Description:	Sets guard time for remote access sequence

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

HANDSHAKE TIMER
Type:	Register
Format:	AT [cmds] S28=n [cmds]
Default:	8
Range:	0-255
Unit:	.1 second
Description:	Sets the length of handshake time, so modems with V.32bis, V.FC and V.34 are given a chance to connect at 9600bps or higher.

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:	0-90
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects. S19=0 will disable.

LINE TYPE
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Description:	Select the line type
Command		Function
í &L0		Dial-up enabled
&L1		Leased-line enabled
&L2		HST cellular enabled

LIST AMPERSAND COMMANDS
Type:	Immediate
Format:	AT [cmds] &$ [cmds]
Description:	Displays ampersand (&) commands

LIST BASIC COMMANDS
Type:	Immediate
Format:	AT [cmds] $ [cmds]
Description:	Displays basic commands

LIST DIAL COMMANDS
Type:	Immediate
Format:	AT [cmds] D$ [cmds]
Description:	Displays dial commands

LIST PERCENT COMMANDS
Type:	Immediate
Format:	AT [cmds] %$ [cmds]
Description:	Displays percent (%) commands

LIST S-REGISTERS
Type:	Immediate
Format:	AT [cmds] S$ [cmds]
Description:	Displays the S-registers

LOCAL CONFIGURATION
Type:	Configuration
Format:	AT [cmds] %Cn [cmds]
Description:	Set local configuration remotely
Command		Function
í %C0		Defer configuration until call terminated
%C1		Restore original configuration
%C2		Execute configuration immediately

LOCAL SERIAL PORT SPEED
Type:	Register
Format:	AT [cmds] %Bn [cmds]
Description:	Selects DTE speed remotely
Command	Function
%B0	Sets to 110bps speed
%B1	Sets to 300bps speed
%B2	Sets to 600bps speed
%B3	Sets to 1200bps speed
%B4	Sets to 2400bps speed
%B5	Sets to 4800bps speed
%B6	Sets to 9600bps speed
%B7	Sets to 19.2Kbps speed
%B8	Sets to 38.4Kbps speed
%B9	Sets to 57.6Kbps speed
%B10	Sets to 115.2Kbps speed

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, Variable in non-ARQ mode.

LOG-ON ATTEMPTS
Type:	Register
Format:	AT [cmds] S41=n [cmds]
Default:	0
Range:	0-255
Unit:	Attempts
Description:	Sets the number of allowable log-on attemtps for remote access

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

PARITY
Type:	Configuration
Format:	AT [cmds] %Fn [cmds]
Description:	Sets parity and data bits remotely
Command		Function
%F0		No Parity, 8 data bits
%F1		Mark Parity, 7 data bits
%F2		Parity odd, 7 data bits
%F3		Parity even, 7 data bits

PASSWORD
Type:	Configuration
Format:	Read: AT [cmds] %Pn? [cmds] Write: AT [cmds] %Pn=x [cmds]
Description:	Reads or writes a password to memory location n. n=0-1

PAUSE
Type:	Immediate
Format:	AT [cmds] / [cmds]
Description:	Pause for 125 msec

PULSE DIALING
Type:	Configuration
Format:	AT [cmds] P [cmds]
Description:	Enables pulse dialing
Note: This command can be duplicated with the P modifier in the D (Dial) command.

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)

RECONNECT - LEASED-LINE
Type:	Register
Format:	AT [cmds] S44=n [cmds]
Default:	15
Range:	0-255
Unit:	1 second
Description:	Sets the length of time the modem senses loss of carrier before re-establishing a leased-line conntion

REMOTE ACCESS ESCAPE CHARACTER
Type:	Register
Format	AT [cmds] S42=n [cmds]
Default:	126
Range:	0-255
Unit:	ASCII
Description:	Selects a character used for the remote access escape sequence

REPEAT CONTINUALLY
Type:	Configuration
Format:	AT [cmds] > [cmds]
Description:	Causes modem to repeat command string continually or up to 10 dial attempts; until a keyboard key is pressed

REPEAT PREVIOUS COMMAND CONTINUALLY
Type:	Immediate
Format:	AT [cmds] A> [cmds]
Description:	Repeat previous command continually
Note: Do not precede this command with AT, or follow it with <CR>.

REPEAT PREVIOUS COMMAND
Type:	Immediate
Format:	A/
Description:	Repeat previous command only once
Note: Do not precede this command with AT, or follow it with <CR>.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports product code
I1	Reports ROM checksum
I2	Reports RAM checksum
I3	Reports call duration and real time
I4	Reports current command settings
I5	Reports NVRAM settings
I6	Reports link diagnostics
I7	Reports product configuration
I10	Reports dial security account status

RESULT CODES
Type:	Configuration
Format:	AT [cmds] Qn [cmds]
Description:	Enables modem to send result codes to the DTE
Command	Function
Q0	Result code sending enabled
Q1	Result code sending disabled
Q2	Result code sending enabled while in originate mode

RESULT CODE FORMAT
Type:	Configuration
Format:	AT [cmds] Vn [cmds]
Description:	Selects word or numeric format for information-text and result codes
Command	Function
V0	Numeric format enabled
í V1	Verbose (word) format enabled

SECURITY
Type:			Register
Format:			AT [cmds] S53=n [cmds]
Default:			0
Range:			0-7
Description:			Controls security features
Bit	Value			Function
0		í 0 1			Dial security disabled Dial security enabled
1		í 0 1			Password prompting disabled Password prompting enabled
2		í 0 1			Local access passsword protection disabled Local access passsword protection enabled

SELECT CALL PROGRESS RESULT CODES
Type:	Configuration
Format:	AT [cmds] Xn [cmds]
Default:	X7
Description:	Enables selection of tone detection and associated result code format options

SOFT RESET
Type:	Immediate
Format:	AT [cmds] Z [cmds]
Description:	Restores modem profile previously saved in non-volatile memory

SPEAKER MODE
Type:	Configuration
Format:	AT [cmds] Mn [cmds]
Description:	Selects various speaker options
Command	Function
M0	Speaker disabled
í M1	Speaker enabled until carrier signal detected
M2	Speaker enabled
M3	Speaker enabled following dialing, then disabled after carrier signal detected.

STATUS-REGISTER
Type:	Configuration
Format:	Read: AT [cmds] Sn? [cmds] Write: AT [cmds] Sn=x [cmds]
Description:	Writes to or reads from a specified register
Command		Function
Sn.b=x		Write to register bit b using values 0 (off) and 1 (on) for x

STORE ACTIVE PROFILE
Type:	Configuration
Format:	AT [cmds] &W [cmds]
Description:	Writes active profile into the non-volatile memory

STORE TELEPHONE NUMBER
Type:	Configuration
Format:	AT [cmds] &Zn=x [cmds]
Description:	Writes selected telephone numbers into the non-volatile memory at location n
Note: The characters described in the D command are valid for use in the &Z command.
Command		Function
&Zn=L		Writes last executed dial string into the non-volatile memory at location n
&Zn?		Displays phone number from non-volatile memory at location n
&ZC=x		Writes command string into the non-volatile memory at location n
&ZC?		Displays stored command string

SYNCHRONOUS CLOCK SOURCE
Type:	Configuration
Format:	AT [cmds] &Xn [cmds]
Description:	Select clock source

SYNCHRONOUS CLOCK SPEED
Type:	Configuration
Format:	AT [cmds] %Nn [cmds]
Description:	Sets synchronous clock speed

TEST MODES
Type:	Configuration
Format:	AT [cmds] &Tn [cmds]
Description:	Controls loopback tests, analog, digital, remote digital, and self tests.
Command		Function
&T0		Testing disabled
&T1		Local analog loopback enabled
&T3		Local digital loopback enabled
&T4		Remote digital loopback enabled
&T5		Remote digital loopback prohibited
&T6		Remote digital loopback initiated
&T7		Remote digital loopback w/ self-test
&T8		Local analog loopback w/ self-test

TEST MODES
Type:			Configuration
Format:			AT [cmds] S16=n [cmds]
Default:			0
Range:			0-15
Description:			Controls loopback tests; analog, digital, dial, and test pattern tests.
Bit	Value			Function
0	í 0 1			Local analog loopback disabled Local analog loopback enabled
1		í 0 1			Dial test disabled Dial test enabled
2		í 0 1			Test pattern disabled Test pattern enabled
3		í 0 1			Remote digital loopback not initiated Remote digital loopback initiated

TEST TIMER
Type:	Register
Format	AT [cmds] S18=n [cmds]
Default:	0
Range:	0-255
Unit:	1 second
Description:	Sets the maximum duration for modem tests
Note: S18=0 disables the timer and allows an indefinite duration.

TONE DIALING
Type:	Configuration
Format:	AT [cmds] T [cmds]
Description:	Enables tone dialing mode
Note: This command can be duplicated with the T modifier in the D (Dial) command.

TONE RECOGNITION
Type:	Immediate
Format:	AT [cmds] %T [cmds]
Description:	Enables tone recognition

VOICE/DATA OPTIONS
Type:	Register
Format:	AT [cmds] S32=n [cmds]
Description:	Select various options the modem will perform
Command		Function
S32=0		Disabled
S32=1		Modem commanded to go off-hook (pick-up) in originate mode
S32=2		Modem commanded to go off-hook (pick-up) in answer mode
S32=3		Re-dial last number dialed
S32=4		Dial stored number at memory location 0
S32=5		Auto-answer toggle on/off
S32=6		Reset modem
S32=7		Remote digital loopback initiated
S32=8		Busy out phone line toggle
í S32=9		Execute stored command string

V.21 - HANDSHAKE
Type:	Register
Format:	AT [cmds] S29=n [cmds]
Default:	20
Range:	0-255
Unit:	.1 second
Description:	Sets the length of handshake time for V.21.

V.32 - HANDSHAKE
Type:	Register
Format:	AT [cmds] S28=n [cmds]
Default:	8
Range:	0-255
Unit:	.1 second
Description:	Sets the length of handshake time for V.32.