28.8 EXTERNAL MODEM modem/telephone/ISDN Settings and Configuration

Card Type	Modem(synchronous/asynchronous), Fax
Chip Set	Unidentified
Maximum Data Rate	28.8Kbps
Maximum Fax Rate	14.4Kbps
Data Bus	External
Fax Class	Class I & II
Data Modulation Protocol	Bell 103A/212A ITU-T V.22, V.22bis, V.32, V.32bis, V.32terbo, V.34
Fax Modulation Protocol	ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression	MNP2-5, V.42, V.42bis

CONNECTIONS
Function	Label		Function		Label
Line in		CN1		RS-232/422		CN3
Line out		CN2		DC power		CN4

DIAGNOSTIC LED(S)
LED	Status	Condition
MR	On	Power is on
MR	Off	Power is off
TR	On	DTR signal is high
TR	Off	DTR signal is low
SD	On	Modem transmitting data
SD	Off	Modem not transmitting data
RD	On	Modem receiving data
RD	Off	Modem not receiving data
OH	On	Modem is off-hook
OH	Off	Modem is on-hook
CD	On	Carrier signal detected
CD	Off	Carrier signal not detected
AA	On	Auto-answer enabled
AA	Off	Auto-answer disabled
EC	On	Error correction in progress
EC	Off	Error correction inactive

AUTO ANSWER RING COUNT
Type:	Register
Format:	AT [cmds] S0=n [cmds]
Unit:	1 ring
Description:	Sets the number of rings allowed before the modem automatically goes off-hook
Note:	If S0=0, automatic-answering is disabled. The A command must be used to go off-hook.
Country		Default	Range
Standard		0	0-255
France		0	0,2-3
Germany		0	0-5
Switzerland		0	0,2-9
Italy		0	0,2

Auto-reliable fallback character
Type:	Register
Format	AT [cmds] S29=n [cmds]
Default:	0
Range:	Unidentified
Unit:	Unidentified
Description:	The character used for fallback in auto-reliable mode

Baud rate set selection
Type:	Configuration
Format:	AT [cmds] %Nn [cmds]
Description:	Sets the type of baud rates the modem uses
Note:	This command only functions in the external version
Command		Function
%N0		Sets modem to IBM PC DTE baud rates
%N1		Sets modem to NEC PC98 DTE baud rate set 1
%N2		Sets modem to NEC PC98 DTE baud rate set 2

BIT MAPPED REGISTERS
Register	Default
S14	137
S15	83
S17	75
S19	3
S20	0
S21	48
S22	246
S23	12
S24	72
S27	0
S28	16

BLIND DIALING DELAY
Type:	Register
Format	AT [cmds] S6=n [cmds]
Unit:	1 second
Description:	Duration of delay after modem goes off-hook and before dialing blindly during modes set by X0, X1 or X3 commands.
Country		Default	Range
Standard		2	2-255
United Kingdom		4	4-7
Switzerland		2	5-15

CARRIER LOSS RESPONSE TIME
Type:	Register
Format	AT [cmds] S10=n [cmds]
Unit:	.1 second
Description:	Maximum time allowed by the modem after losing the carrier signal and prior to initiating hang-up process.
Country		Default	Range
Standard		14	1-255
Germany		14	2-204

COMMUNICATIONS MODE
Type:	Configuration
Format:	AT [cmds] &Qn [cmds]
Description:	Selects communications mode options
Command	Mode
í &Q0	Asynchronous mode, serial port speed follows connect speed.
&Q1	Asynchronous off-line command mode and synchronous connect mode.
&Q2	If an off to on DTR transition occurs, modem automatically dials first number in directory, then activates synchronous connect mode.
&Q3	Synchronous connect mode on high DTR.

COMMUNICATION PROTOCOLS
Type:	Configuration
Format:	AT [cmds] Bn [cmds]
Description:	Selects the communication protocol for data calls
Note:	The B command allows the simultaneous selection of more than one suffix, enabling multiple protocols.
Command	Protocol
B0	ITU-T V.22 at 1200bps or V.21 at 300
B1	Bell 212A at 1200bps or Bell 103 at 300
B2	In V.23 originate mode receive at 1200bps transmit at 75bps; in answer mode receive at 75bps transmit at 1200bps

DIAL
Type:	Immediate
Format:	AT [cmds] D<#> [cmds]
Description:	Dials telephone number according to any modifiers included in the string
Note:	Any combination of modifiers can be used to produce the desired dial functions in sequence.
Command	Function
DP	Pulse dialing enabled
DR	Answer mode enabled; originate mode disabled following handshake initiation.
DS=n	Dial stored telephone number n (n= 0 to 3)
DT	Tone dialing enabled/Pulse dialing disabled
DW	Dialing resumed following dial tone detection
D,	Dialing paused for amount of time specified in S8 register
D"WXY"	Optional method of denoting telephone numbers. Letters enclosed in quotes are interpreted as numbers according to the system found on a telephone keypad.
D!	Flash function initiated. Modem commanded to go off-hook for specified time before returning on-hook.
D@	Wait for Quiet Answer function enabled. Modem waits until a "quiet answer," a ring-back signal followed by silence up to the time specified in S7, is received prior to executing the rest of the dial string.
D;	Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command.
D^	Enables calling tone for data modem

dumb mode
Type:	Configuration
Format:	AT [cmds] %Dn [cmds]
Description:	Puts the modem into dumb mode
Note:	Used in situations where the modem’s microprocessor is not required, such as connection to a mainframe, leased line, or in synchronous mode
Command		Function
%D0		Dumb mode disabled
%D1		Dumb mode enabled

INACTIVITY TIMER
Type:	Configuration
Format:	AT [cmds] \Tn [cmds]
Default:	0
Range:	0-90
Unit:	1 minute
Description:	Sets the length of time that the modem does not receive information before it disconnects.

INACTIVITY TIMER
Type:	Register
Format	AT [cmds] S30=n [cmds]
Default:	0
Range:	0-90
Unit:	1 second
Description:	Maximum duration of DTE and DCE inactivity allowed prior to initiating hang-up process.
Note:	S30=0 disables the timer and allows indefinite inactivity.

Modem connection speed
Type:	Configuration
Format:	AT [cmds] %Bn [cmds]
Description:	Sets the maximum connection speed
Command		Function
%B300		300bps
%B1200		1200bps
%B2400		2400bps
%B4800		4800bps
%B7200		7200bps
%B9600		9600bps
%B12000		12.0Kbps
%B14400		14.4Kbps
%B16800		16.8Kbps
%B19200		19.2Kbps
%B21600		21.6Kbps
%B24000		24.0Kbps
%B26400		26.4Kbps
%B28800		28.8Kbps

NO CARRIER TIME-OUT
Type:	Register
Format	AT [cmds] S7=n [cmds]
Unit:	1 second
Description:	Maximum time the modem waits after dialing to detect a carrier signal from the remote modem for both originating and answering calls.
Note:	W dial modifier also uses S7 to set the maximum time to wait.
Country		Default	Range
Standard		45	1-255
France		45	30-85
Germany		45	5-80
Switzerland		45	5-55
Italy		50	45-50

PULSE DIALING RATIO
Type:	Configuration
Format:	AT [cmds] &Pn [cmds]
Description:	Selects pulse dial make/break ratio
Command	Function
í &P0	33/67ms at 10pps (Europe)
&P1	39/61ms at 10pps
&P2	33/67ms at 20pps

REPORT INFORMATION
Type:	Immediate
Format:	AT [cmds] In [cmds]
Description:	Displays information requested
Command	Function
I0	Reports modem product code
I1	Reports ROM checksum
I2	Tests and reports ROM checksum
I3	Reports model and firmware identification
I5	Reports country code

RTS TO CTS DELAY
Type:	Register
Format	AT [cmds] S26=n [cmds]
Default:	1
Range:	0 - 255
Unit:	.01 second
Description:	Sets the duration of delay for CTS to respond to RTS status change
Note:	This is only used when &R0 is set.

TONE PULSE DURATION
Type:	Register
Format	AT [cmds] S11=n [cmds]
Default:	95
Range:	50-255
Unit:	1 ms
Description:	DTMF tone pulse duration and time between tone pulses for tone dialing operations.
Country		Default	Range
Standard		95	50-255
France		85	70-90
Germany		85	85-95
Switzerland		85	70-90
Italy		85	65-150
Spain		135	135-255

TRANSMISSION LEVEL - PSTN
Type	Register or Configuration
Format	AT [cmds] S91=n [cmds]
Unit	-1 dBm
Description	Sets the signal level for transmission over switched phone lines
Country		Default	Range
Standard		12	0-15
Sweden		14	0-15