Windows Marketplace V.90 - Manual (Page 28)

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Appendix A: AT Command Set
AT Commands
AT commands are issued to the modem to control the modem’s operation and
software configuration. AT commands can only be entered while the modem is in
command mode. The format for entering AT commands is:
TYPE: ATXn
where X is the AT command, and n is the specific value for that command.
PRESS: Enter
Any command issued is acknowledged with a response in text format known as
result codes. For multiple AT commands in the same command line, the com-
mands are executed in the order received from the DTE. Should execution of a
command result in an error, or a character not be recognized as a valid command,
execution is terminated, the remainder of the command line is ignored, and the
ERROR result code is issued. Otherwise, if all commands execute correctly, only
the result code associated with the last command shall be issued; result codes for
preceding commands are suppressed.
In the following listing, all commands and command values accepted by the mo-
dem are shown; any entries other than those shown cause the ERROR result code.
+++ Escape sequence
The escape sequence allows the modem to exit data mode and enter on-line com-
mand mode. While in on-line command mode, you may communicate directly to
your modem using AT commands. Once you are finished, you may return to data
mode using the ATO command. A pause, the length of which is set by the Escape
Guard Time (S12), must be used after an escape sequence is issued. This pause
prevents the modem from interpreting the escape sequence as data. The value of
the escape sequence character may be changed using Register S2.
A/ Repeat Last Command
This command repeats the last command string entered. Do not precede this com-
mand with an AT prefix or conclude it by pressing Enter.
A Answer Command
This command instructs the modem to go off-hook and answer an incoming call.