CONNECTIONS
Purpose	Location	Purpose	Location
Line out	CN1	Speaker	CN5
Line in	CN2	Microphone	CN6
RS-232/422	CN3	Power switch	SW1
DC power	CN4
Note: SW2 not installed on 28V14XV.

SYNCHRONOUS/ASYNCHRONOUS OPERATION
Setting	SW2/2	SW2/3
Asynchronous operation	On	Off
Synchronous with internal clock	On	Off
Synchronous with external clock	Off	On
Synchronous with slave clock	Off	Off

DSR/DTR FORCED HIGH
Setting	SW2/4
» Normal operation	On
DSR/DTR forced high	Off

COMMAND SET
Setting	SW2/6
V.25bis command set	Off
AT command set	On

REMOTE CONFIGURATION
Setting	SW2/7
Enabled	Off
Disabled	On

CALLBACK SECURITY
Setting	SW2/8
Disabled	Off
Enabled	On

FACTORY CONFIGURED SETTINGS
Switch	Setting
Off	SW2/1
On	SW2/5

DIAGNOSTIC LED(S)
LED	Icon	Status	Condition
AA	AA	On	Auto-answer enabled
AA	AA	Off	Auto-answer disabled
AA	AA	Blinking	Phone is ringing
ST	Pyramid of balls	On	Self test mode
ST	Pyramid of balls	Off	Normal operation
ST	Pyramid of balls	Blinking	Self test failure
RX	Modem left arrow	On	Modem is receiving data
RX	Modem left arrow	Off	Modem is not receiving data
TX	Modem right arrow	On	Modem is transmitting data
TX	Modem right arrow	Off	Modem is not transmitting data
CD	Phone	On	Carrier signal detected
CD	Phone	Off	Carrier signal not detected
HS	Running figure	On	Modem is operating at 4800bps or faster
HS	Running figure	Off	Modem is operating at slower than 4800bps
OH	Crossed out phone	On	Modem is off-hook
OH	Crossed out phone	Off	Modem is on-hook
TR	Box	On	DTR signal is high
TR	Box	Off	DTR signal is low
MS	Box	On	Modem connected at more than 24Kbps
MS	Box	Off	Modem connected at less than 24Kbps
MR	Rectangle	On	Power is on
MR	Rectangle	Off	Power is off

CALLER ID
Type:	Configuration
Format:	AT [cmds] #CID=n [cmds]
Example:	AT #CID=2<CR>
Description:	Controls the Caller ID function.
Command	Function
» #CID=0	Caller ID disabled.
#CID=1	Caller ID displays formatted data.
#CID=2	Caller ID displays raw hexadecimal data.

CALLER ID DISPLAY
Type:	Immediate
Format:	AT [cmds] #CID? [cmds]
Example:	AT#CID?<CR>
Description:	Displays current caller ID status.

BIT-MAPPED REGISTER FACTORY DEFAULTS
Register	Default
S21	4
S23	54
S27	9
S28	0
S29	0
S31	2
S40	105 (MNP models)
S40	107 (non MNP models)
S41	3

BIT-MAPPED REGISTER S22
Format		AT [cmds] S22=n [cmds]
Example:		ATS22=117<CR>
Default:		117
Range:		0-127
Unit:		Bit-mapped
Description:		Controls speaker volume and controls, and limits results codes.
Bit	Value		Function
1, 0	» 01 10 11		On volume. Medium level volume. High level volume.
3, 2	00 » 01 10 11		Speaker off. Speaker off on carrier. Speaker always on. Speaker on during handshake.
6, 5, 4	000 100 101 110 » 111		Basic result codes only enabled. Basic and connection speed result codes enabled. Basic and connection speed result codes and dialtone detection enabled. All result codes except dialtone detection enabled. All result codes enabled.

CALLER ID HELP DISPLAY
Type:	Immediate
Format:	AT [cmds] #CID=? [cmds]
Example:	AT#CID=?<CR>
Description:	Displays modem’s caller ID capability.

CELLULAR TRANSMIT LEVEL
Type:	Register/Immediate
Format:	AT [cmds] S201=n [cmds]
Example:	ATS201=6<CR>
Default:	63
Range:	1-63
Unit:	Unidentified
Description:	Selects cellular transmit level.

DISPLAY CURRENT COMMAND STATUS
Type:	Immediate
Format:	AT [cmds] \S [cmds]
Example:	AT &Z2=9W1-303-555-1212 \S<CR>
Description:	Displays current setting of modem commands.

DISPLAY DELAYED NUMBERS
Type:	Immediate
Format:	*D
Example:	*D<CR>
Description:	Requests the list of delayed numbers from the modem. This is a list of numbers that the modem attempted to call and and failed, and is not allowed to call again until a set amount of time has elapsed. This is usually to prevent repeated dialing of a number (which could indicate an attempted security breach.).

DISPLAY FORBIDDEN NUMBERS
Type:	Immediate
Format:	*B
Example:	*B<CR>
Description:	Requests the list of forbidden numbers from the modem. The modem is unable to dial numbers on this list until its power has been cycled.

DISPLAY STORED NUMBERS
Type:	Immediate
Format:	AT [cmds] \F? [cmds]
Example:	AT \F2=9W1-303-555-1212 \F?<CR>
Description:	Displays all stored phone numbers.

ERROR CORRECTION DISPLAY
Type:	Configuration
Format:	AT [cmds] Wn [cmds]
Example:	AT W0 &W<CR>
Description:	Selects connect display format.
Command	Function
W0	Display serial port speed enabled.
W1	Display line speed, MNP, and serial port speed enabled.
W2	Display line speed enabled.

FAX TRANSMISSION ATTENUATION
Type:	Register
Format:	AT [cmds] S92=n [cmds]
Example:	ATS92=6<CR>
Default:	10
Range:	1- 15
Unit:	1 dBm
Description:	Selects fax attenuation level.

FLASH DIAL MODIFIER TIME
Format	AT [cmds] S29=n [cmds]
Example:	ATS29=0<CR>
Default:	0
Range:	0-255
Unit:	10 ms
Description:	Time the modem will go on-hook upon receiving the ! dial modifier in dial string.

FLOW CONTROL CHARACTER - XOFF
Type:	Register
Format:	AT [cmds] S33=n [cmds]
Example:	ATS33=20<CR>
Default:	19
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XOFF.

FLOW CONTROL CHARACTER - XON
Type:	Register
Format:	AT [cmds] S32=n [cmds]
Example:	ATS32=20<CR>
Default:	17
Range:	0-255
Unit:	ASCII
Description:	Sets the character used to represent XON.

LOOPBACK TESTS
Format		AT [cmds] S16=n [cmds]
Example:		ATS16=32<CR>
Default:		0
Range:		0 - 125
Unit:		Bit-mapped
Description:		Enables loopback tests.
Note:		Bit 3 is read-only.
Bit	Value		Function
0	» 0 1		Local analog loopback test disabled. Local analog loopback test enabled.
1	0		Not used.
2	» 0 1		Local digital loopback test disabled. Local digital loopback test enabled.
3	» 0 1		Modem is not performing remote digital loopback test. Modem is performing remote digital loopback test.
4	» 0 1		Remote digital loopback test disabled. Remote digital loopback test enabled.
5	» 0 1		Remote digital loopback with local self-test disabled. Remote digital loopback with local self-test enabled.
6	» 0 1		Local analog loopback with local self-test disabled. Local analog loopback with local self-test enabled.

MODULATION SELECTION
Type:	Configuration
Format:	AT [cmds] +MS=xx,y,zzz,aaa [cmds]
Example:	AT +MS11,1,300,28800 &W<CR>
Description:	Sets options for active protocol. The transfer rates specified by z and a must be valid for the protocol selected.
Command	Function
x=0	V.21
x=1	V.22
x=2	V.22bis
x=3	V.23
x=9	V.32
x=10	V.34
» x=11	V.34
x=64	Bell 103A
x=69	Bell 212A
x=74	V.FC
» y=1	Auto-detect highest speed enabled.
y=0	Automode disabled.
z, a=300	Set minimum or maximum transfer rate at 300bps, respectively.
z, a=1200	Set minimum or maximum transfer rate at 1200bps, respectively.
z, a=2400	Set minimum or maximum transfer rate at 2400bps, respectively.
z, a=4800	Set minimum or maximum transfer rate at 4800bps, respectively.
z, a=7200	Set minimum or maximum transfer rate at 7200bps, respectively.
z, a=9600	Set minimum or maximum transfer rate at 9600bps, respectively.
z, a=12000	Set minimum or maximum transfer rate at 12000bps, respectively.
z, a=14400	Set minimum or maximum transfer rate at 14400bps, respectively.
z, a=16800	Set minimum or maximum transfer rate at 16800bps, respectively.
z, a=19200	Set minimum or maximum transfer rate at 19200bps, respectively.
z, a=21600	Set minimum or maximum transfer rate at 21600bps, respectively.
z, a=24000	Set minimum or maximum transfer rate at 24000bps, respectively.
z, a=26400	Set minimum or maximum transfer rate at 26400bps, respectively.
z, a=28800	Set minimum or maximum transfer rate at 28800bps, respectively.
Note: Default for z is 300bps. Default for a is 28800.

MODULATION SELECTION DISPLAY
Type:	Immediate
Format:	AT [cmds] +MS?
Example:	AT +MS? <CR>
Description:	Displays modulation, automode, minimum rate and maximum rate settings

SLEEP TIMER
Format	AT [cmds] S24=n [cmds]
Example:	ATS24=40<CR>
Default:	1
Range:	0 - 255
Unit:	1 second
Description:	Maximum duration of DTE and DCE inactivity allowed prior to initiating low-power sleep mode.