APPENDIX A. AT COMMANDS

 

AT&T0

Ends test in progress

 

 

 

 

AT&T1

Initiates local analog loopback

 

 

 

 

AT&T3

Initiates remote digital loopback locally. If no connection

 

 

exists, ERROR is returned.

 

 

 

 

AT&T4

Allows the modem to respond to a request from a remote

 

 

modem for a remote digital loopback test

 

 

 

 

AT&T5

Prohibits the modem from granting a request from a remote

 

 

modem for a remote digital loopback test

 

 

 

 

AT&T6

Initiates remote digital loopback. If no connection exists,

 

 

ERROR is returned.

 

 

 

 

AT&T7

Initiates remote digital loopback with

self

test. If

no

 

 

connection exists, ERROR is returned.

 

 

 

 

AT&T8

Initiates local analog loopback with self test

 

 

AT&V

View current configuration and user profiles /

last

connection

 

statistics

 

 

 

 

 

AT&V0

Displays the active configuration and user profiles

 

 

AT&V1

Displays the last connection statistics

 

 

 

AT&Wn

Store user profile

Default :

0

 

AT&W0

Save as user profile 0

 

 

 

 

AT&W1

Save as user profile 1

 

 

 

AT&Xn *

Clock source selection

Default :

0

 

Select the source of the transmit clock for the synchronous operation.

 

In asynchronous mode, the transmit and receive clock are turned OFF.

 

AT&X0

Selects internal timing. The modem generates the transmit

 

 

clock signal and applies it to TXCLK output (Pin 15 of

 

 

RS232-C) at the serial interface

 

 

 

 

AT&X1

Selects external timing. The local DTE sources the transmit

 

 

clock signal on the XTCLK input (Pin 24 of RS232-C) of

 

 

the serial interface. The modem applies this clock to

 

 

TXCLK output (Pin 15 of RS232-C) at the serial interface.

 

AT&X2

Selects slave receive timing. The modem derives the

 

 

transmit clock signal from the incoming carrier and applies

 

 

it to the TXCLK output (Pin 15 of RS232-C) at the serial

 

 

interface.

 

 

 

AT&Yn *

Designate default user profile

Default :

0

 

Selects which user profile will be used after a hard reset.

 

 

 

AT&Y0

Selects user profile 0

 

 

 

 

AT&Y1

Selects user profile 1

 

 

 

AT&Zn=x

Store phone number (n = 0 - 3)

Default :

0

 

Stores a 36-digit dial string (x) in the specified entry (n) for later

 

dialling (see ATDS=n command).

 

 

 

ACTIVE Professional External Modem User’s Manual

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