Table A-1.

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

AT

Parameter &

 

Command

Option

Description

 

 

 

AT*TD1

=Rx Clock

With this setting, the remote modem uses its internal Rx Clock to control the flow of data from

 

 

the modem to the DTE, preventing a loss of synchronization during data transmission. This

 

 

setting lets the remote modem begin transmitting data before an end-of-frame has been

 

 

received from the local modem. If the rate of data transmission slows, the clock stops,

 

 

temporarily ceasing the flow of data.

 

 

Telenetics recommends that the Rx Clock setting be used in most applications.

 

 

NOTE: This setting is operational only when Clock=Internal (AT&X).

AT*TD2

=RxD Dly

With this setting, the remote modem continuously monitors and adjusts line traffic to estimate

 

 

(based on time) when to transmit data to the DTE. The modem calculates a delay time based on

 

 

variables such as frame size, DTE rate, DCE rate, and data compression ratio. The remote

 

 

modem waits this time before transmitting data to its DTE. NOTE: Due to variable line

 

 

conditions or varying types of data, frame losses could result with this selection.

 

 

 

 

Tone Length

Tone Length

 

 

Determines the time duration of the DTMF (Dual Tone Multifrequency) tone. This command is

 

 

operational only when tone dialing is selected using dial modifiers or the ATT command.

AT*TL0

=72

Tone length is 72 ms.

AT*TL1

=S11

The tone length is determined by S-Register 11. See Appendix C for your country’s options.

 

Call Timeout

Call Timeout

 

 

Determines how long the modem waits from the time it completes dialing to the time it detects

 

 

answer-back tone from the remote modem. If the modem does not receive answer-back tone

 

 

from the remote modem within the specified time, the modem disconnects.

AT*TT0

=30

The modem waits 30 seconds for a call to succeed.

AT*TT1

=45

The modem waits 45 seconds for a call to succeed.

 

 

AT*TT2

=60

The modem waits 60 seconds for a call to succeed.

AT*TT3

=90

The modem waits 90 seconds for a call to succeed.

AT*TT4

=180

The modem waits 180 seconds for a call to succeed.

AT*TT5

=S7

The modem waits the amount of time specified by S-Register 7 for a call to succeed. See

 

 

Appendix C for your country’s options.

 

RelMsg

This command applies to the Reliable and Auto-Reliable data transfer modes only. The local

 

 

modem can send a reliable message to the DTE along with the normal connect message if both

 

 

modems negotiated a reliable (error-corrected) connection.

 

 

 

AT*XC0

=Off

If enabled, the modem sends a connect message to the DTE, but it does not send the reliable

 

 

portion of the connect message. A typical connect message is CONNECT 9600.

AT*XCl

=Short

The modem sends a reliable connect message to the DTE when a reliable connection is

 

 

successful. The message indicates the local DTE-to-modem data rate, but no error correction or

 

 

data compression is included. Atypical short reliable connect message is CONNECT 9600

 

 

RELIABLE.

AT*XC2

=Long

The modem sends a reliable connect message to the DTE when a connection is successful. The

 

 

message indicates that the local DTE-to-modem data rate, as well as the error-correction and

 

 

data-compression schemes, are being used. A typical long reliable connect message is

 

 

CONNECT 9600 RELIABLE EC=(LAPM) DC=(V42bis).

 

 

 

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

Configuration

Quick-Reference

Configuration Quick Reference A-31

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Image 147
Telenetics V.34-SDC, 326X V.34, V.32bis Series manual Tone Length, Call Timeout, RelMsg
Page 146 Page 148

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