Table A-1.

AT Commands, Cross-Referenced to Front Panel Options (Continued)

AT

 

Parameter &

 

Command

Option

Description

 

 

 

AT*DL2

=60

60-ms delay before the modem sends CTS to the DTE after receiving RTS from the DTE.

AT*DL3

=90

90-ms delay before the modem sends CTS to the DTE after receiving RTS from the DTE.

AT*DL4

=S26

RTS/CTS delay is determined by the value of S-Register 26.

 

 

Pause Delay

Pause Delay

 

 

 

Makes the modem pause when it encounters modifiers in a dial string or on the command line.

 

 

 

AT*DP0

=3

Pause delay is 3 seconds.

AT*DP1

=6

Pause delay is 6 seconds.

AT*DP2

=9

Pause delay is 9 seconds.

AT*DP3

=12

Pause delay is 12 seconds.

AT*DP4

=S8

Pause delay is determined by S-Register 8. See the “S-Registers” section in Chapter 5.

 

 

Auto Redial

Auto Redial

 

 

 

Determines how many times the modem redials a failed call. The modem waits for a country-

 

 

 

specific time between redials. If the AT*LN option is enabled, the modem dials all of the

 

 

 

linked numbers before redialing.

AT*DR0

=Off

The modem does not redial an unsuccessful call.

AT*DRn

=n

The modem redials an unsuccessful call n times (n=1-15).

AT*DSn or

Dial From

Dialing a Stored Telephone number (n=1-9)

*

Stored#

 

AT

DS=n

See the ATDS description earlier for information on using this command.

 

 

 

 

 

=n

 

 

 

 

 

 

 

DTR Delay

DTR Delay

 

 

 

Determines how long the modem waits after connecting to the dial line before examining the

 

 

 

DTR signal from the DTE. If the DTR signal is low, the modem disconnects. This feature is

 

 

 

used when AT Form =SyncData or V25 Form=AsynSync.

AT*DT0

=S25

The modem waits for the time specified by S-Register 25 before examining DTR.

AT*DT1

=10 sec

The modem waits 10 seconds before examining DTR.

AT*DT2

=15 sec

The modem waits 15 seconds before examining DTR.

 

 

EC

Error Correction

 

 

 

The AT*EC (EC) command determines which error-correction protocol is used. NOTE: This

 

 

 

option does not apply when the modem is configured for SDC operation. If both the local and

 

 

 

remote modems are operating in SDC mode, LAPM error correction with V.42bis data

 

 

 

compression only is used; no other setting is available.

AT*EC0

=V.42

The modems negotiate the use of LAPM or MNP error correction. First, the modems attempt to

 

 

 

negotiate using LAPM. If unsuccessful, they attempt to negotiate using MNP.

AT*EC1

=LAPM

The modems attempt to negotiate LAPM error correction.

AT*EC2

=MNP

The modems attempt to negotiate MNP error correction.

 

 

Fast Call

Fast Call

 

 

 

Reduces the time for selected phases of the connect sequence.

AT*FC0

=Off

This option disables the Fast Call feature.

AT*FC1

=Lvl1

The 2.15 second billing delay in the answer modem is eliminated. The length of time ABT is

 

 

 

sent is reduced by 1 second in all modulation modes except V.34.

Gray shading indicates country-specific options. See Appendix C for your country’s options.

Configuration

Quick-Reference

Configuration Quick Reference A-19

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Motorola and V.32bis, V.34-SDC, 326X V.34 manual Pause Delay, Auto Redial, Stored#, DTR Delay, Fast Call