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APPENDIX A. AT COMMANDS
ACTIVE Professional External Modem User’s Manual
18
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).