CONNECTIONS
Purpose	Location	Purpose	Location
DC power	CN1	Line in	CN4
RS-232/422	CN2	Power switch	SW1
Line out	CN3	Volume	R1

ASYNCHRONOUS/SYNCHRONOUS
Settings	SW5/D
Synchronous	On
» Asynchronous	Off

AUTO-ANSWER
Settings	SW4/E
» Enable auto answer/originate	On
Disable/answer	Off
Note: When SW5/B is set for Lease Line operation, the options on this switch change to Originate and Answer

BLIND/WAIT DIALING
Settings	SW5/C
» Blind dialing	Off
Wait for dial tone	On

BAUD RATE
Settings	SW2
1200bps	Position 1
300bps	Position 2
2400bps	Position 3

CD/DSR
Settings	SW4/F
» CD/DSR normal	On
CD/DSR forced high	Off

COMMAND CHARACTERS
Settings	SW4/D
» Echo enable	On
Echo disable	Off

COMMAND MODE
Settings	SW4/H
» Enable	Off
Disable	On

CTS
Settings	SW5/A
» CTS forced high	On
CTS normal	Off

CTS/RTS
Settings	JP2
» CTS follows RTS	Pins 1 & 2 closed
CTS forced high until disconnect	Pins 2 & 3 closed

DSR
Settings	JP3
» DSR follows CD	Pins 2 & 3 closed
DSR follows OH	Pins 1 & 2 closed

FORCED DTR
Settings	SW4/A
» DTR forced high	Off
DTR normal	On

JACK TYPE
Settings	SW4/G
» RJ11	On
RJ12/13	Off

RESULT CODES
Settings	SW4/B
» Verbose	On
Terse	Off

RESULT CODES
Settings	SW4/C
» Enable	Off
Disable	On

RTS
Settings	JP1
» RTS forced high	Pins 1 & 2 closed
RTS normal	Pins 2 & 3 closed

SWITCHED/LEASE LINE
Settings	SW5/B
» Switched	On
Lease line	Off

VOICE/DATA MODE
Settings	SW3
Answer	Position 1
Originate	Position 2

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
SD	Red	On	Modem is transmitting data
SD	Red	Off	Modem is not transmitting data
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
CD	Red	On	Carrier signal detected
CD	Red	Off	Carrier signal not detected
24	Red	Blinking fast	Modem connected at 2400bps in reliable mode
24	Red	Blinking slow	Modem connected at 2400bps with data compression
24	Red	Off	Modem not connected at 2400bps
12	Red	Blinking fast	Modem connected at 1200bps in reliable mode
12	Red	Blinking slow	Modem connected at 1200bps with data compression
12	Red	Off	Modem not connected at 1200bps
OH	Red	On	Modem is off-hook
OH	Red	Off	Modem is on-hook
TR	Red	On	DTR signal is high
TR	Red	Off	DTR signal is low

AUTO-RELIABLE TIME BUFFER CONFIGURATION
Type:	Configuration
Format:	AT [cmds] $An [cmds]
Example:	AT $A1 &W<CR>
Description:	Controls the handling of incoming data during auto-reliable time period.
Command	Function
» $AO	Data is discarded.
$A1	Data is buffered.

BLIND DIALING
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Example:	AT B0 <CR>
Description:	Selects blind dial or wait-for-dial-tone.
Command	Function
» B0	Modem will blind dial.
B1	Modem will wait for dial tone before dialing.

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

CD SIGNAL
Type:	Configuration
Format:	AT [cmds] &Cn [cmds]
Example:	AT &C3 $D0<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.

COMMAND SET
Type:	Configuration
Format:	AT [cmds] &Qn [cmds]
Example:	AT &Q0<CR>
Description:	Selects standard Hayes or custom command sets.
Command	Function
» &Q0	Multi-Tech custom command set enabled.
&Q1	Standard Hayes command set enabled.

COMPRESSION
Type:	Configuration
Format:	AT &En
Example:	AT &E15 #L0<CR>
Description:	Selects data compression.
Command	Function
&E14	Data compression disabled.
» &E15	Data compression enabled.

DIAL STORED PHONE NUMBER
Type:	Immediate
Format:	AT [cmds] Nn1 [Nn2, Nn3...]
Example:	ATM0 N1N3N5<CR>
Description:	Dials stored phone number(s). If the first number is busy, the modem will proceed to the next number in the list.

DSR/CTS/CD TIMEOUT
Type:	Register
Format:	AT [cmds] S24=n [cmds]
Example:	ATS24=40<CR>
Default:	20
Range:	0-255
Unit:	50 ms
Description:	Sets the time to drop the DSR, CTS, and CD signals to hangup.

DTR DIALING
Type:	Configuration
Format:	AT [cmds] $Dn [cmds]
Example:	AT $D1 DT555-1212<CR>
Description:	Selects the DTR dialing function.
Command	Function
» $D0	DTR dialing disabled.
$D1	DTR dialing enabled.

DTR TIMEOUT
Type:	Register
Format:	AT [cmds] S25=n [cmds]
Example:	ATS25=30<CR>
Default:	0
Range:	0-255
Unit:	.1 second
Description:	Sets the time to drop the DTR signal to hangup.
Note:	Setting S25 to 0 sets the DTR timeout to 50 ms.

DUPLEX
Type:	Configuration
Format:	AT [cmds] Fn [cmds]
Example:	AT F1 &W<CR>
Description:	Controls duplex mode.
Command	Function
F0	Half duplex enabled.
» F1	Full duplex enabled.

FACTORY DEFAULTS
Type:	Immediate
Format:	AT &F
Example:	AT &F<CR>
Description:	Loads factory defaults from ROM and DIP-switches.

FLOW CONTROL
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E13<CR>
Description:	Selects flow control.
Command	Function
&E12	Flow control disabled.
» &E13	Flow control enabled.

FLOW CONTROL - ENQ/ACK
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E8<CR>
Description:	Selects ENQ/ACK pacing.
Command	Function
» &E8	Disables ENQ/ACK pacing.
&E9	Enables ENQ/ACK pacing.

FLOW CONTROL IN NORMAL MODE
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E11 O<CR>
Description:	Selects XON/XOFF flow control for non-error-correcting connections.
Command	Function
» &E10	XON/XOFF disabled for non-error-correcting connections.
&E11	XON/XOFF enabled for non-error-correcting connections.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E3 &W<CR>
Description:	Sets type of flow control used by modem.
Command	Function
» &E3	Flow control disabled.
&E4	CTS/RTS flow control enabled.
&E5	XON/XOFF flow control enabled.

HELP SCREENS
Type:	Immediate
Format:	AT $Hn
Example:	AT $H1<CR>
Description:	Shows modem help screens.
Command	Function
$H1	Shows help screen 1.
$H2	Shows help screen 2.
$H3	Shows help screen 3.
$H4	Shows help screen 4.

INACTIVITY TIMER
Type:	Configuration
Format:	AT [cmds] &In [cmds]
Example:	AT &I5 S30=40<CR>
Description:	Sets the length of time that the modem does not receive information before it disconnects.
Command	Function
» &I0	Inactivity timer disabled.
&I1	Modem will disconnect after 10 minutes of inactivity.
&I2	Modem will disconnect after 30 minutes of inactivity.
&I3	Modem will disconnect after 60 minutes of inactivity.

LIST CONFIGURATION
Type:	Immediate
Format:	AT Ln
Example:	AT L5<CR>
Description:	Lists modem configuration.
Command	Function
L0	Lists all phone numbers in memory.
L5	Lists all settings.
L6	Lists the values of all S-registers.
L7	Lists extended parameters.

LOCAL SERIAL PORT SPEED
Type:	Configuration
Format:	AT [cmds] $SBnnn [cmds]
Example:	AT $MB9600 $SB19200<CR>
Description:	Sets serial port speed.
Command	Function
$SB110	Sets 110bps speed.
$SB300	Sets 300bps speed.
$SB1200	Sets 1200bps speed.
» $SB2400	Sets 2400bps speed.
$SB4800	Sets 4800bps speed.
$SB9600	Sets 9600bps speed.

LOCK SERIAL PORT
Type:	Configuration
Format:	AT [cmds] $BAn [cmds]
Example:	AT $SB57600 $BA0<CR>
Description:	Sets operation of serial port speed.
Command	Function
» $BA0	Serial speed locked at rate set by $SB.
$BA1	Serial speed follows connect speed, ignoring $SB.

LOOPBACK TEST MODE
Type:	Configuration
Format:	AT [cmds] Un [cmds]
Example:	AT U2 &W<CR>
Description:	Places modem in test mode.
Command	Function
U0	Begin local analog loopback test in originate mode.
U1	Begin local analog loopback test in answer mode.
U2	Request remote digital loopback
U3	Begin local digital loopback.

MAXIMUM BLOCK SIZE FOR TRANSMISSION
Type:	Configuration
Format:	AT [cmds] &BSn [cmds]
Example:	AT &BS1 &MB28800<CR>
Description:	Sets the maximum transmittable block size.
Command	Function
&BS0	Maximum block size is 64 characters.
» &BS1	Maximum block size is 256 characters.

PROTOCOL
Type:	Configuration
Format:	AT [cmds] &Vn [cmds]
Example:	AT &V1 <CR>
Description:	Selects the protocol for low-speed data calls.
Command	Function
&V0	Bell protocols.
» &V1	ITU-T protocols.

REDIAL
Type:	Immediate
Format:	A:
Example:	A:
Description:	Redials the last number dialed until it is no longer busy.
Note:	Do not precede this command with AT or follow it with <CR>.

REMOTE CONNECT SPEED
Type:	Configuration
Format:	AT $MBnnn
Example:	AT $MB2400 $SB19200<CR>
Description:	Sets maximum remote connect speed.
Command	Function
$MB75	Sets V.23 (1200bps/75bps bi-directional).
$MB110	Sets 110bps connect.
$MB300	Sets 300bps connect.
$MB1200	Sets 1200bps connect.
» $MB2400	Sets 2400bps connect.

RETRANSMIT FAIL ACTION
Type:	Configuration
Format:	AT [cmds] $Rn [cmds]
Example:	AT $R1<CR>
Description:	Sets whether the modem gives up on a bad connection.
Command	Function
» $R0	Hang up after 12 failed retransmissions.
$R1	Do not hang up after 12 failed retransmissions.

STORE PHONE NUMBER IN NVRAM
Type:	Configuration
Format:	AT [cmds] D<#>N<0-9>
Example:	ATD1(303)-443-3323N6 <CR>
Description:	Stores a phone number in the modem’s memory. Only the dialstring before the Nn will be stored.

V.42 MODE
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E0 <CR>
Description:	Configures the operation of V.42 mode.
Command	Function
» &E0	Error correction disabled.
&E1	V.42 set to auto-reliable.
&E2	V.42 set to reliable.

WAIT FOR DIAL TONE
Type:	Immediate
Format:	AT [cmds] W [cmds]
Example:	AT W <CR>
Description:	Wait for new dial tone.

XON/XOFF PASS-THROUGH
Type:	Configuration
Format:	AT [cmds] &En [cmds]
Example:	AT &E6 <CR>
Description:	Selects whether XON/XOFF signals are sent to remote modem.
Command	Function
» &E6	XON/XOFF signals trapped by local modem.
&E7	XON/XOFF passed through local modem.