ZOOM TELEPHONICS, INC.

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

DIAGNOSTIC LED(S)
LED	Color	Status	Condition
MSG	Red	On	Stored faxes exist
MSG	Red	Off	No faxes stored
FX	Red	On	Modem is connected in FAX mode
FX	Red	Off	Modem is not connected in FAX mode
V.34	Red	On	Modem is in V.34 mode.
V.34	Red	Off	Modem is not in V.34 mode.
V.FC	Red	On	Modem is in V.FC mode.
V.FC	Red	Off	Modem is not in V.FC mode.
14.4	Red	On	Modem connected at 14.4Kbps
14.4	Red	Off	Modem not connected at 14.4Kbps
DC	Red	On	Error correction enabled
DC	Red	Off	Error correction disabled
EC	Red	On	Error correction enabled
EC	Red	Off	Error correction disabled
FC	Red	On	Flow control enabled
FC	Red	Off	Flow control disabled
AA	Red	On	Auto-answer enabled
AA	Red	Off	Auto-answer disabled
AA	Red	Blinking	Phone is ringing
CD	Red	On	Carrier signal detected
CD	Red	Off	Carrier signal not detected
OH	Red	On	Modem is off-hook
OH	Red	Off	Modem is on-hook
RD	Red	On	Modem is receiving data
RD	Red	Off	Modem is not receiving data
TD	Red	On	Modem is transmitting data
TD	Red	Off	Modem is not transmitting data
TR	Red	On	DTR signal is high
TR	Red	Off	DTR signal is low
MR	Red	On	Power is on
MR	Red	Off	Power is off

AUTO-RETRAIN
Type:	Configuration
Format:	AT %En
Example:	AT %E1 <CR>
Description:	Selects auto-retrain mode.
Command	Function
%E0	Auto-retrain disabled.
%E1	Auto-retrain enabled.
» %E2	Fallback/fall forward enabled.
%E3	Fallback/fall forward and fast hang-up enabled.

COMPRESSION
Type:	Configuration
Format:	AT %Cn
Example:	AT *EC0 %C1 *AP0<CR>
Description:	Selects data compression.
Command	Function
%C0	Data compression disabled.
%C1	MNP5 enabled.
%C2	V.42bis enabled.
» %C3	MNP5 and V.42bis enabled.

BREAK SEND
Type:	Configuration
Format:	AT [cmds] \Bn [cmds]
Example:	AT \B3 &W<CR>
Default:	3
Range:	1-9
Unit:	.1 second
Description:	Sends break to modem.

FLOW CONTROL TYPE
Type:	Configuration
Format:	AT [cmds] \Kn [cmds]
Example:	AT \K1 <CR>
Description:	Configures action of break signal.
Command	Function
\K0	Flow control disabled.
» \K3	RTS/CTS flow control enabled.
\K4	XON/XOFF flow control 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.
\N2	Error correction mode enabled.
» \N3	MNP mode with fallback to normal mode enabled.
\N4	LAPM mode only enabled.
\N5	MNP mode only enabled.

CELLULAR TRANSMISSION LEVEL
Type:	Configuration
Format:	AT [cmds] @Mn [cmds]
Example:	AT @M26 &W<CR>
Default:	26
Range:	10 - 31
Unit:	-1 dBm
Description:	Sets the signal level for transmission when in leased line mode.

COMPROMISE EQUALIZER
Type:	Configuration
Format:	AT [cmds] :En [cmds]
Example:	AT :E &W<CR>
Description:	Controls V.32 compromise equalizer.
Command	Function
:E0	Equalizer disabled.
» :E1	Equalizer enabled.

CONNECTION FAILURE CODES
Format	AT [cmds] S86? [cmds]
Example:	ATS86? <CR>
Default:	Read-only
Range:	0, 4 - 14
Unit:	None
Stored:	N/A
Description:	Reports codes which correspond to the possible causes of a connection failure.
Value	Meaning
0	No failure - normal hang-up.
4	Carrier signal lost.
5	No error-control detected for remote modem during feature negotiation.
6	Remote modem failed to respond to feature negotiation.
7	Local modem is asynchronous-only, remote modem is synchronous-only.
8	No common framing technique found.
9	No common protocol found.
10	Remote modem sent erroneous feature negotiation message.
11	Remote modem failed to send synchronous information.
12	No failure - remote modem disconnected normally.
13	Remote modem failed to respond after 10 re-transmissions same message.
14	Violation of negotiated protocol caused failure.

ERROR CORRECTION REJECTION
Format		AT [cmds] S36=n [cmds]
Example:		ATS36=0<CR>
Default:		Unidentified
Range:		0 - 7
Unit:		Bit-mapped
Description:		Configures the modem’s behavior if an error-correcting connection cannot be made.
Command	Function
0	Modem disconnects
3	Modem attempts normal connection.
4	Modem attempts MNP connection.
7	Modem attempts MNP connection. If it fails, modem attempts normal connection.

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
Type:	Configuration
Format:	AT [cmds] \Gn [cmds]
Example:	AT G1 &K3<CR>
Description:	Selects modem port flow control.
Command	Function
» \G0	Flow control disabled.
\G1	Flow control enabled.

FLOW CONTROL DISPLAY
Format		AT [cmds] S39? [cmds]
Example:		ATS39?<CR>
Default:		Read-only
Range:		0, 3 - 6
Unit:		None
Stored:		N/A
Description:		Contains the current flow control.
Value	Meaning
0	Flow control is disabled.
» 3	RTS/CTS flow control is enabled.
4	XON/XOFF flow control is enabled.
5	AFT XON/XOFF flow control is enabled.
6	RTS/CTS and XON/XOFF flow control enabled.

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.

LEASED LINE RECEIVE LEVEL DISPLAY
Type:	Immediate
Format:	AT [cmds] %L [cmds] l
Example:	AT %L &W<CR>
Description:	Displays signal level for reception when in leased-line mode.

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.

MNP10 COMPRESSION
Type:	Configuration
Format:	AT [cmds] -Kn [cmds]
Example:	AT %C1 -K1 -Q0 <CR>
Description:	Selects MNP10 data compression.
Command	Function
-K0	MNP10 disabled.
» -K1	MNP10 enabled.
-K2	MNP10 enabled on originate mode only.

MNP10 FALL-BACK
Type:	Configuration
Format:	AT [cmds] -Qn [cmds]
Example:	AT *H0 -Q1 <CR>
Description:	Allows MNP10 to fall back to speeds slower than 4800bps.
Command	Function
-Q0	MNP10 at 2400 and 1200bps disabled.
» -Q1	MNP10 at 2400 and 1200bps enabled.

MNP10 POWER LEVEL ADJUST
Type:	Configuration
Format:	AT [cmds] )Mn [cmds]
Example:	AT )M1 %C1<CR>
Description:	Controls automatic transmit power level adjustment during MNP 10 link negotiation.
Command	Function
» )M0	Power level adjustment disabled.
)M1	Power level adjustment enabled.

MNP10 LINK NEGOTIATION
Type:	Configuration
Format:	AT [cmds] *Hn [cmds]
Example:	AT *H0 -Q1 <CR>
Description:	Sets the speed at which MNP10 link negotiation will occur.
Command	Function
» *H0	Link will be negotiated at highest possible speed.
*H1	Link will be negotiated at 1200bps.
*H2	Link will be negotiated at 4800bps.

MNP STREAM/BLOCK MODE
Type:	Configuration
Format:	AT [cmds] \Ln [cmds]
Example:	AT \L1 DT555-1212<CR>
Description:	Selects the transfer mode for MNP.
Command	Function
» \L0	Stream mode for MNP enabled.
\L1	Block mode for MNP 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.32bis
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.

NEGOTIATE LINE SPEED
Type:	Configuration
Format:	AT [cmds] %Q [cmds]
Example:	AT %Q &W<CR>
Description:	Displays signal quality.

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