CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	DC power	CN4
Line in	CN2	Power switch	SW1
RS-232/422	CN3

FACTORY RESET
Mode	SW2
Normal operation	On
NVRAM clear	Off

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
MR	Red	On	Power is on
MR	Red	Off	Power is off
MR	Red	Blinking	Modem is performing self-test
TR	Red	On	DTR signal is high
TR	Red	Off	DTR signal is low
CD	Red	On	Carrier signal detected
CD	Red	Off	Carrier signal not detected
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
AA	Red	On	Auto-answer enabled
AA	Red	Off	Auto-answer disabled
AA	Red	Blinking	Phone is ringing
OH	Red	On	Modem is off-hook
OH	Red	Off	Modem is on-hook
HS	Red	On	Modem is operating at 16.8Kbps or faster
HS	Red	Off	Modem is operating between 4800bps and 14.4Kbps
HS	Red	Blinking	Modem is operating at 2400bps or slower

AUTO-RELIABLE FALLBACK CHARACTER
Type:	Register
Format:	AT [cmds] %An [cmds]
Example:	AT%A20<CR>
Default:	0
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
» \C0	Data is discarded.
\C1	Data is buffered.

BREAK TYPE
Type:	Configuration
Format:	AT [cmds] \Kn [cmds]
Example:	AT \K1 <CR>
Description:	Configures action of break signal.
Command	Function
\K1	Buffers cleared and break sent to remote modem.
\K3	Send break to remote modem immediately.
\K5	Send break with transmitted data.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B50 O<CR>
Default:	35
Range:	1-255
Unit:	20ms
Description:	Sends break to modem.

CALLER ID
Type:	Configuration
Format:	AT [cmds] *IDn [cmds]
Example:	AT *ID1<CR>
Description:	Controls the Caller ID function.
Command	Function
» *ID0	Caller ID disabled.
*ID1	Caller ID enabled.

CD SIGNAL
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Example:	AT &C3 *RS1 *SR1<CR>
Description:	Configures the behavior of the carrier detect signal.
Command	Function
&C0	CD forced high.
» &C1	CD normal.
&C2	CD forced high except during disconnect.
&C3	CD follows remote RTS signal.

COMMAND SET
Type:	Configuration
Format:	AT [cmds] *NTn [cmds]
Example:	AT *NT0<CR>
Description:	Disables the AT command set.
Note:	To re-enable the command set, power down the modem and then cycle power seven times. The modem must remain powered on each time at least one second but not more than five.
Command	Function
*NT0	Command set disabled.
» *NT1	Command set 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.
\N6	LAP-M mode with fallback to MNP enabled.
» \N7	LAP-M mode with fallback to MNP and normal modes enabled.

CONNECTION SPEED LOWER LIMIT
Type:	Configuration
Format:	AT [cmds] %Ln [cmds]
Example:	AT %L3 %B14 \J0<CR>
Description:	Sets slowest allowed connection speed.
Command	Function
» %L0	Disabled.
%L2	Select 1200bps minimum speed.
%L3	Select 2400bps minimum speed.
%L4	Select 4800bps minimum speed.
%L5	Select 9600bps uncoded minimum speed.
%L6	Select 9600bps minimum speed.
%L7	Select 7200bps minimum speed.
%L8	Select 12Kbps minimum speed.
%L9	Select 14.4Kbps minimum speed.
%L10	Select 600bps minimum speed.
%L11	Select 16.8Kbps minimum speed.
%L12	Select 19.2Kbps minimum speed.
%L13	Select 21.6Kbps minimum speed.
%L14	Select 24Kbps minimum speed.
%L15	Select 26.4Kbps minimum speed.
%L16	Select 28.8Kbps minimum speed.

CONNECTION SPEED UPPER LIMIT
Type:	Configuration
Format:	AT [cmds] %Bn [cmds]
Example:	AT %L3 %B14 \J0<CR>
Description:	Sets fastest allowed connection speed.
Command	Function
%B0	Follow serial port speed.
%B1	Select 300bps maximum speed.
%B2	Select 1200bps maximum speed.
%B3	Select 2400bps maximum speed.
%B4	Select 4800bps maximum speed.
%B5	Select 9600bps uncoded maximum speed.
%B6	Select 9600bps maximum speed.
%B7	Select 7200bps maximum speed.
%B8	Select 12Kbps maximum speed.
» %B9	Select 14.4Kbps maximum speed.
%B10	Select 600bps maximum speed.
%B11	Select 16.8Kbps maximum speed.
%B12	Select 19.2Kbps maximum speed.
%B13	Select 21.6Kbps maximum speed.
%B14	Select 24Kbps maximum speed.
%B15	Select 26.4Kbps maximum speed.
%B16	Select 28.8Kbps maximum speed.

CTS SIGNAL
Type:	Configuration
Format:	AT [cmds] &Rn [cmds]
Example:	AT &R0<CR>
Description:	Selects the function of the CTS signal.
Command	Function
&R0	CTS normal.
» &R1	CTS forced high.
&R2	CTS follows CD.
&R9	CTS follows RTS.

DISCONNECT BUFFER DELAY
Type:	Configuration
Format:	AT [cmds] %Dn [cmds]
Example:	AT %D0<CR>
Default:	0
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait to disconnect if there is data in the transmit or receive buffers.

DISPLAY STORED NUMBERS
Type:	Immediate
Format:	AT [cmds] *ND [cmds]
Example:	AT*CN3,555-1212 *ND<CR>
Description:	Displays all stored phone numbers.

DSR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Sn [cmds]
Example:	AT &S0<CR>
Description:	Selects the function of the DSR signal.
Command	Function
» &S0	DSR forced high.
&S1	DSR normal.
&S2	DSR normal, except forced low on disconnect.
&S3	DSR follows OH.

DTR SIGNAL
Type:	Configuration
Format:	AT [cmds] &Dn [cmds]
Example:	AT &D1<CR>
Description:	Configures the behavior of the Data Terminal Ready signal.
Command	Function
» &D0	DTR forced high.
&D1	Modem will enter command mode on low DTR.
&D2	Modem will disconnect on low DTR.
&D3	Modem will disconnect and reset on low DTR.
&D9	DTR dialing enabled.

EXTENDED RESULT CODES
Type:	Configuration
Format:	AT [cmds] \Vn [cmds]
Example:	AT \V1 %C1<CR>
Description:	Selects extended result codes.
Command	Function
\V0	Extended result codes disabled, DTE speed reported.
\V1	Protocol result codes enabled, DTE speed reported.
\V2	Extended result codes disabled, DCE speed reported.
\V3	Protocol result codes enabled, DCE speed reported.
» \V4	Protocol and modulation result codes enabled, DCE speed reported.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] \Gn [cmds]
Example:	AT G1 &M0<CR>
Description:	Selects modem port flow control.
Command	Function
» \G0	Flow control disabled.
\G1	Flow control enabled.

FLOW CONTROL CHARACTER - XOFF FROM TERMINAL
Type:	Register
Format:	AT [cmds] S45=n [cmds]
Example:	ATS45=22<CR>
Default:	19
Range:	0-127
Unit:	ASCII
Description:	Sets the character the terminal sends to represent XOFF.

FLOW CONTROL CHARACTER - XON FROM TERMINAL
Type:	Register
Format:	AT [cmds] S44=n [cmds]
Example:	ATS44=20<CR>
Default:	17
Range:	0-127
Unit:	ASCII
Description:	Sets the character the terminal sends to represent XON.

FLOW CONTROL CHARACTER - XOFF TO TERMINAL
Type:	Register
Format:	AT [cmds] S50=n [cmds]
Example:	ATS50=23<CR>
Default:	19
Range:	0-127
Unit:	ASCII
Description:	Sets the character the modem sends to represent XOFF.

FLOW CONTROL CHARACTER - XON TO TERMINAL
Type:	Register
Format:	AT [cmds] S49=n [cmds]
Example:	ATS49=21<CR>
Default:	17
Range:	0-127
Unit:	ASCII
Description:	Sets the character the modem sends to represent XON.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] \Qn [cmds]
Example:	AT \Q5<CR>
Description:	Sets type of flow control used by modem.
Command	Function
\Q0	Flow control disabled.
\Q1	Bidirectional XON/XOFF flow control enabled.
\Q2	CTS flow control by DCE enabled.
» \Q3	Bidirectional CTS/RTS flow control enabled.

FORCE RETRAIN
Type:	Immediate
Format:	AT [cmds] *RRn [cmds]
Example:	AT *RR14 O<CR>
Description:	Forces the modem to attempt to retrain to the selected speed.
Command	Function
*RR0	Attempt 2400bps speed.
*RR1	Attempt 4800bps speed.
*RR2	Attempt 7200bps speed.
*RR3	Attempt 9600bps speed.
*RR4	Attempt 12Kbps speed.
*RR5	Attempt 14.4Kbps speed.
*RR6	Attempt 16.8Kbps speed.
*RR7	Attempt 19.2Kbps speed.
*RR8	Attempt 21.6Kbps speed.
*RR9	Attempt 24Kbps speed.
*RR10	Attempt 26.4Kbps speed.
*RR11	Attempt 28.8Kbps speed.

HANG UP MODE
Type:	Configuration
Format:	AT [cmds] Hn [cmds]
Example:	AT H3 O<CR>
Description:	Selects how the modem will hang up.
Command	Function
» H2	Set hang up mode to normal on next ATH command.
H3	Set hang up mode to fast on next ATH command.

HELP SCREENS
Type:	Immediate
Format:	AT $H=xxxx
Example:	AT $H=MNP<CR>
Description:	Shows modem help screens. If a string is included as shown in the example, the modem will perform a search for the string; otherwise, the whole help section will be displayed.

INACTIVITY TIMER
Type:	Register
Format:	AT [cmds] \Tn [cmds]
Example:	AT\T20<CR>
Default:	0
Range:	0-255
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] \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.

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Configuration
Format:	AT [cmds] \An [cmds]
Example:	AT \A3 %C1<CR>
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.

PROTOCOL/SPEED
Type:	Configuration
Format:	AT [cmds] *MMn [cmds]
Example:	AT *MN6 *MX14 *MM11<CR>
Description:	Selects the current protocol.
Command	Function
*MM0	Selects all protocols.
*MM1	Selects V.21 only.
*MM2	Selects Bell 103 only.
*MM3	Selects V.23 only.
*MM4	Selects Bell 212 only.
*MM5	Selects V.22bis only.
*MM11	Selects V.32bis only.
*MM12	Selects V.34 only.

REDIAL DISABLE
Type:	Configuration
Format:	AT [cmds] *DNn [cmds]
Example:	AT *DN1<CR>
Description:	Disables the ability to redial the last number with A/.
Command	Function
» *DN0	A/ enabled.
*DN1	A/ disabled.

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Example:	AT I3 &V1 %V<CR>
Description:	Displays modem properties.
Command	Function
I0	Reports modem model and speed.
I1	Reports checksum number.
I3	Reports firmware version.
I4	Reports feature code.
I5	Reports reason for last disconnect.

REPORT INFORMATION AND CONFIGURATION PROFILE
Type:	Immediate
Format:	AT [cmds] &Vn [cmds]
Example:	AT I3 &V1 %V<CR>
Description:	Reports configuration profiles and other information.
Command	Function
&V0	Report configuration profiles.
&V1	Report connection status and internal modem information.
&V2	Report active configuration profile.

REPORT PRODUCT VERSION
Type:	Immediate
Format:	AT [cmds] %V [cmds]
Example:	AT I3 &V1 %V<CR>
Description:	Reports product version.

REPORT SERIAL NUMBER
Type:	Immediate
Format:	AT [cmds] $V [cmds]
Example:	AT I3 &V1 $V<CR>
Description:	Reports product serial number.

RETRAIN SENSITIVITY
Type:	Configuration
Format:	AT [cmds] %Rn [cmds]
Example:	AT &C3 %R1<CR>
Description:	Sets how poor line conditions must be before the modem will initiate a retrain.
Command	Function
» %R0	Modem will not initiate retrain.
%R1	Modem will initiate retrain when the Bit Error Rate exceeds 10-5 for eight seconds, or for one second in V.22bis mode.
%R2	Modem will initiate retrain when the Bit Error Rate exceeds 10-4 for eight seconds, or for one second in V.22bis mode.
%R3	Modem will initiate retrain when the Bit Error Rate exceeds 10-3 for eight seconds, or for one second in V.22bis mode.

RI SIGNAL
Type:	Configuration
Format:	AT [cmds] \Rn [cmds]
Example:	AT \R0 Q0<CR>
Description:	Controls the behavior of the Ring Indicator signal.
Command	Function
\R0	RI signal high during rings, and forced high for duration of call.
» \R1	RI signal high during rings only.

SECURITY - CALLBACK DELAY
Type:	Register
Format:	AT [cmds] S74=n [cmds]
Example:	AT S74=30<CR>
Default:	15
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait to execute a callback sequence after the user has disconnected.

SECURITY - CALLBACK NUMBER
Type:	Configuration
Format:	AT [cmds] $Cn=<#> [cmds]
Example:	AT $L0=3 $C0=1(303)443-3388<CR>
Description:	Sets the callback number for user number n.

SECURITY - CALLBACK RETRY
Type:	Register
Format:	AT [cmds] S75=n [cmds]
Example:	AT S75=5<CR>
Default:	0
Range:	0-255
Unit:	1 redial
Description:	Sets how many times the modem will attempt to execute a callback if the first call fails.

SECURITY - CALLBACK RETRY DELAY
Type:	Register
Format:	AT [cmds] S76=n [cmds]
Example:	AT S76=60<CR>
Default:	15
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait to execute another callback sequence after one has failed.

SECURITY CHECK
Type:	Immediate
Format:	AT [cmds] $D? [cmds] AT [cmds] $E? [cmds]
Example:	AT $DR $D?<CR>
Description:	Reports whether security is enabled.

SECURITY DISABLE
Type:	Immediate
Format:	AT [cmds] $D=xxxx
Example:	AT $D=MicroHouse<CR>
Description:	Disables security. A password must be specified.

SECURITY ENABLE
Type:	Immediate
Format:	AT [cmds] $EH=xxxx
Example:	AT $EH=SuperSecret<CR>
Description:	Enables security. The superuser password must be specified.

SECURITY - DELETE USER
Type:	Configuration
Format:	AT [cmds] $Rn [cmds]
Example:	AT $R3<CR>
Description:	Deletes the user number n. User IDs 0 and 1 cannot be deleted.

SECURITY - FAILED LOGIN ATTEMPT COUNTERS
Type:	Configuration/Immediate
Format:	AT [cmds] $Mn [cmds]
Example:	AT $M $M*<CR>
Description:	Displays or clears the counters for failed login attempts. If a number is specified, the counter will be reset for that user. If an * follows, all counters will be cleared. If no character follows, the counters will be displayed.

SECURITY - FAILED LOGIN ATTEMPT MAXIMUM
Type:	Register
Format:	AT [cmds] S77=n [cmds]
Example:	AT S77=3<CR>
Default:	0
Range:	0-255
Unit:	1 attempt
Description:	Sets the maximum number of failed logins the modem will accept until it disconnects.

SECURITY LEVEL
Type:	Configuration
Format:	AT [cmds] $Lm=n [cmds]
Example:	AT $L0=3 $C0=1(303)443-3388<CR>
Description:	Sets the security level for user number m.
Command	Function
$Lm=1	Modem prompts for a user ID and password on connection.
$Lm=2	Modem prompts for a user ID and password on connection, then modem begins callback sequence.
$Lm=3	Modem prompts for a user ID and password on connection, then modem begins callback sequence. When modem reconnects, it prompts for a user ID and password again.

SECURITY LOGIN
Type:	Immediate
Format:	AT [cmds] $n=xxxx [cmds]
Example:	AT $1=MicroHouse<CR>
Description:	Logs into modem, from the local machine or remotely.

SECURITY LOGOUT
Type:	Immediate
Format:	AT [cmds] $$ [cmds]
Example:	AT $$<CR>
Description:	Logs out from the modem.

SECURITY PASSWORD
Type:	Configuration
Format:	AT [cmds] $Pn=xxxx$xxxx
Example:	AT $P0=SuperSecret$SuperSecret<CR>
Description:	Sets the password for user number n to xxxx. User number 0 is the superuser. The password must be between 4 and 34 characters inclusive. The $ character may not be used.

SECURITY - PASSWORD TIME
Type:	Register
Format:	AT [cmds] S73=n [cmds]
Example:	AT S73=10<CR>
Default:	Unidentified
Range:	0-255
Unit:	1 second
Description:	Configures how long the modem will wait for a password when in secure mode.

SECURITY - REPORT SUPERUSER STATUS
Type:	Immediate
Format:	AT [cmds] $Sn? [cmds]
Example:	AT $S3?<CR>
Description:	Reports whether user n has superuser status.

SECURITY - REPORT USER SETTINGS
Type:	Immediate
Format:	AT [cmds] $In [cmds]
Example:	AT $I3<CR>
Description:	Reports security level and callback number for user n.

SECURITY RESET
Type:	Configuration
Format:	AT [cmds] $F=xxxx$xxxx
Example:	AT $F=SuperSecret$SuperSecret<CR>
Description:	Resets the high security options to their factory defaults.

SECURITY - SUPERUSER MODE
Type:	Immediate
Format:	AT [cmds] $S=xxxx [cmds]
Example:	AT $S=SuperSecret<CR>
Description:	Attempts to enter superuser mode.

STATUS REGISTER HEXADECIMAL
Type:	Configuration
Format:	Write: AT [cmds] Sn=^hh [cmds] Read: AT [cmds] Sn?^ [cmds]
Example:	AT S99=^3F S99?^<CR>
Description:	Sets register n to hexadecimal number hh or displays register n in hexadecimal.

SWITCHED LINE TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] *TDn [cmds]
Example:	AT *TD15<CR>
Default:	9
Range:	9 - 30
Unit:	-1 dBm
Description:	Sets the signal level for transmission when in switched line mode.

TEST MODE - BIDIRECTIONAL DIGITAL LOOPBACK TEST
Type:	Configuration
Format:	AT [cmds] *DGn [cmds]
Example:	AT *DG1<CR>
Description:	Controls the bidirectional local digital loopback test mode.
Command	Function
» *DG0	End loopback test.
*DG1	Begin loopback test.

V.32 HANDSHAKE OPTIONS
Type:	Configuration
Format:	AT [cmds] *FTn [cmds]
Example:	AT *FT0<CR>
Description:	Shortens V.32 and V.32bis handshake time.
Command	Function
» *FT0	Normal handshake sequence.
*FT1	Training time is shortened by 2 seconds in V.32 and V.32bis modes.

V.34 RETRAIN SENSITIVITY
Type:	Configuration
Format:	AT [cmds] *THn [cmds]
Example:	AT *MM12 *TH1<CR>
Description:	Sets how poor line conditions must be before the modem will initiate a retrain when in V.34 mode.
Command	Function
*TH0	Modem will initiate retrain when the Bit Error Rate exceeds 10-6.
*TH1	Modem will initiate retrain when the Bit Error Rate exceeds 10-4.
» *TH2	Modem will initiate retrain when the Bit Error Rate exceeds 10-2.

V.34 SPLIT BAUD MODE
Type:	Configuration
Format:	AT [cmds] *ASn [cmds]
Example:	AT *AS1 <CR>
Description:	Controls V.34 split baud mode.
Command	Function
*AS0	V.34 split baud mode disabled.
» *AS1	V.34 split baud mode enabled.

V.42 NEGOTIATION MODE
Type:	Configuration
Format:	AT [cmds] \Mn [cmds]
Example:	AT \M0 H1 DT555-1212<CR>
Description:	Selects how the modem negotiates V.42 modulation during handshaking.
Command	Function
\M0	Normal handshaking enabled.
» \M1	Fast handshaking enabled.

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.