CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	LCD control button	BT1
Line in	CN2	LCD control button	BT2
Lease line	CN3	LCD control button	BT3
RS-232/422	CN4	LCD control button	BT4
DC power	CN5	LCD control button	BT5
Power switch	SW1	OK button	BT6
Volume	R1	More button	BT7

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
PWR	Red	On	Power is on
PWR	Red	Off	Power is off
TD	Red	On	Modem is transmitting data
TD	Red	Off	Modem is not transmitting data
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
DCD	Red	On	Carrier signal detected
DCD	Red	Off	Carrier signal not detected
OH	Red	On	Modem is off-hook
OH	Red	Off	Modem is on-hook
RTS	Red	On	DTE sends RTS signal
RTS	Red	Off	DTE does not send RTS signal
DTR	Red	On	DTR signal is high
DTR	Red	Off	DTR signal is low
AA	Red	On	Auto-answer enabled
AA	Red	Off	Auto-answer disabled

AUTO-REDIAL
Type:	Configuration
Format:	AT [cmds] $Dn [cmds]
Example:	AT $D0 &W<CR>
Description:	Controls auto-redial.
Command	Function
» $D0	Auto-redial disabled.
$D1	Auto-redial enabled, if remote is busy will try up to n times.

BUFFER SIZE
Type:	Configuration
Format:	AT [cmds] $Bn [cmds]
Example:	AT $B0<CR>
Description:	Selects the modem’s transmit/receive buffer size.
Command	Function
í$B0	Normal buffer size.
$B1	Small buffer size.

BREAK LENGTH (LAPM)
Type:	Register
Format:	AT [cmds] S34=n [cmds]
Example:	ATS34=20<CR>
Default:	35
Range:	1-255
Unit:	.1 second.
Description:	Sets the length of breaks for LAPM protocol.

CALLBACK SECURITY LEVEL
Type:	Configuration
Format:	AT [cmds] $Yn [cmds]
Example:	AT $Y1 S0=1<CR>
Description:	Sets the security level of the callback function.
Command	Function
$Y0	Callback security disabled.
$Y1	Enables CB1; Set password for 10 users; Modem prompt caller for password and a number (0-9). Modem disconnects, correct password initiates call back.
$Y2	Enables CB2; Set password for any user; Modem prompt caller for password and complete phone number. Modem disconnects, correct password initiates call back.
$Y3	Enables CB3; Set password for 10 individual users; Modem prompt caller for their password. Modem disconnects, correct password initiates call back for their phone number.
$Y4	Enables caller filter without call back. Set password for any user; Modem prompt caller for password, correct password modem stays on-line, not password modem disconnects.

CHARACTER LENGTH
Type:	Configuration
Format:	AT [cmds] $Ln [cmds]
Example:	AT $L3<CR>
Description:	Sets length of character.
Command	Function
$L0	8 bits per character.
$L1	9 bits per character.
» $L2	10 bits per character.
$L3	11 bits per character.

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 MESSAGE
Type:	Configuration
Format:	AT [cmds] $Xn [cmds]
Example:	AT $X2 &W<CR>
Description:	Controls connect message.
Command	Function
$X0	Normal connect and DCE speed message enabled.
$X1	Normal connect and DTE speed message enabled.
» $X2	Extended connect and DCE speed message enabled.
$X3	Extended connect and DTE speed message enabled.

DIAL INTERRUPT
Type:	Configuration
Format:	AT [cmds] $Kn [cmds]
Example:	AT $K1 &W<CR>
Description:	Control dial interrupt.
Command	Function
$K0	Dial interrupt disabled.
» $K1	Dial interrupt enabled.

ECHO CANCELER LENGTH
Type:	Configuration
Format:	AT [cmds] $An [cmds]
Example:	AT $A0 &W<CR>
Description:	Controls canceler length.
Command	Function
$A0	Standard canceler enabled.
» $A1	Long canceler enabled, used when round-trip delay is > 36.833ms.

ERROR CORRECTION MODE
Type:	Configuration
Format:	AT [cmds] $En [cmds]
Example:	AT $E1 %C1<CR>
Description:	Selects active error-correction protocols.
Command	Function
$E0	Normal mode enabled.
$E1	Auto-MNP mode enabled.
$E2	MNP mode enabled.
» $E3	Auto-V.42 mode enabled.
$E4	LAPM mode enabled.

EXTENDED RING
Type:	Configuration
Format:	AT [cmds] $In [cmds]
Example:	AT$I0<CR>
Description:	Selects the response to extended ring types.
Command	Function
» $I0	Respond to all ring types.
$I1	Respond to single ring.
$I2	Respond to double ring.
$I3	Respond to single and double rings.
$I4	Respond to triple ring.
$I5	Respond to single and triple rings.
$I6	Respond to double and triple rings.
$I7	Respond to all ring types.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] $Fn [cmds]
Example:	AT $F4 &W<CR>
Description:	Select type of flow control.
Command	Function
$F0	XON/XOFF local flow enabled.
$F1	XON/XOFF passthrough flow enabled.
$F2	HP ENQ/ACK pacing enabled.
$F3	Hardware DTR/DSR flow control enabled.
» $F4	Hardware CTS/RTS flow control enabled.
$F5	Flow control disabled.
$F6	modem translates XON/XOFF received from line to CTS.

FLOW CONTROL IN SPEED CONVERSION
Type:	Configuration
Format:	AT [cmds] $Mn [cmds]
Example:	AT $M1 &W<CR>
Description:	Controls DCE-to-DCE flow in speed conversion.
Command	Function
» $M0	DCE-to-DCE flow in speed conversion disabled, (XON/XOFF).
$M1	DCE-to-DCE flow in speed conversion enabled, (XON/XOFF).

HOLD HOOK TIME
Type:	Register
Format:	AT [cmds] S30=n [cmds]
Example:	ATS30=6<CR>
Default:	0
Range:	0-255
Unit:	1 second.
Description:	Sets hold hook time for lease line mode.

IDENTIFICATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Example:	AT I3 &W<CR>
Description:	Displays several options.
Command	Function
I0	Display product - identification code.
I1	Display software version.
I2	Show ‘OK’ twice.
I8	Test memory.
I9	Display ROM checksum.

LEASED LINE BACKUP RECOVERY DELAY
Type:	Register
Format:	AT [cmds] S33=n [cmds]
Example:	ATS33=10<CR>
Default:	60
Range:	0-255
Unit:	1 minute.
Description:	After leased line failure, modem attempts to reconnect after specified delay.

PASSWORD
Type:	Immediate
Format:	AT [cmds] $Pn [cmds]
Example:	AT $P12 &W<CR>
Description:	Controls password.
Command	Function
$Pn	Change password for call back 3, for stored n phone number (0<n>9).
$P10	Change password for remote configuration.
$P11	Change password for call back 1.
$P12	Change password for call back 2.
$P13	Change password for call filter.

PROTOCOL/SPEED
Type:	Configuration
Format:	AT [cmds] &Ln [cmds]
Example:	AT &L0 A<CR>
Description:	Selects the current protocol and speed.
Command	Function
» &L0	Auto-select fastest common protocol.
&L1	Connect at V.23 75/1200bps.
&L2	Not used.
&L3	Connect at 300bps.
&L4	Connect at 600bps.
&L5	Connect at 1200bps.
&L6	Connect at 2400bps.
&L7	Connect at 4800bps.
&L8	Connect at 7200bps.
&L9	Connect at 9600bps.
&L10	Connect at 12Kbps.
&L11	Connect at 14.4Kbps.
&L12	Connect at 16.8Kbps.
&L13	Connect at 19.2Kbps.
&L14	Not used.
&L15	Connect at 21.6Kbps.
&L16	Connect at 24Kbps.
&L17	Connect at 26.4Kbps.
&L18	Connect at 28.8Kbps.

REDIAL
Type:	Register
Format:	AT [cmds] S32=n [cmds]
Example:	ATS32=20<CR>
Default:	20
Range:	0-255
Unit:	1 second.
Description:	Sets length of time before modem redials the last number dialed.

REMOTE CONFIGURATION
Type:	Configuration
Format:	AT [cmds] $Rn [cmds]
Example:	AT $R0 &W<CR>
Description:	Controls remote configuration.
Command	Function
» $R0	Remote configuration disabled.
$R1	Remote configuration enabled.

RETRAIN OPTION
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E0 &W<CR>
Description:	Selects retraining option.
Command	Function
» &E0	Disconnect after 4 retrain attempts during 3 minute period.
&E1	Disconnect after 4 retrain attempts during 4 minute period.
&E2	Disconnect after 4 retrain attempts during 5 minute period.
&E3	Retrain action always enabled.
&E4	Retrain action disabled.

SWITCHED LINE TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] $Tn [cmds]
Example:	AT $T12<CR>
Default:	12
Range:	0 - 15
Unit:	-1 dBm.
Description:	Sets the signal level for transmission when in switched line mode.

V.34 PROTOCOL
Type:	Configuration
Format:	AT [cmds] $Vn [cmds]
Example:	AT $V1 <CR>
Description:	Controls V.34 protocol.
Command	Function
$V0	V.34 protocol disabled.
» $V1	V.34 protocol enabled.

V.42 DETECTION OPTIONS
Type:	Register
Format:	AT [cmds] S48=n [cmds]
Example:	ATS48=7<CR>
Default:	7
Range:	0 and 7
Unit:	Unidentified.
Description:	Controls detection phase.
Command	Function
S47=0	Originating side detection disabled.
» S47=7	Originating side detection enabled.

V.42 DETECTION TIMER
Type:	Register
Format:	AT [cmds] S47=n [cmds]
Example:	ATS47=75<CR>
Default:	75
Range:	75-255
Unit:	.01 second.
Description:	Sets the time for V.42 negotiation.