11
Chaper 2 AT Commands Set
AT commands are issued to DTE to control the modem's operation. AT
commands can only be entered while the modem is in command mode. Except
for the A/ command and the +++ escape command, all commands must be
prefixed with the attention code AT. For instance, the “A” command (below)
would be entered as: "ATA<CR>". Without the AT prefix, the command line
cannot be executed. For example: The format for entering AT commands is
“ATXn” where X is the AT command, and n is the specific value for that
command.
More than one command can be placed on a single line and (if desired)
separated with spaces for readability. Once the carriage return (Enter) key is
pressed, the command line is executed. A line with no carriage return is
ignored. Any command issued is acknowledged with a response in either text
or numeric values known as result codes. In the following, all commands,
command-values and result code recognized by the modem are shown; any
entries other than those shown cause the ERROR result code. The modem
accepts either upper or lower case characters in the command line and
ignores any spaces within or between commands. Typing errors can be
corrected with the Backspace key. Exceptions are noted in the description of
specific commands.
+++AT Escape Sequence
The escape sequence allows the modem to exit data mode and enter online
command mode. While in online command mode, you may communicate
directly to your modem using AT commands. You may return to data mode by
issuing the ATO command.
2.1 Data Mode Command
A/ Executes Last Command
When modem receives this command, modem executes the last command
string entered. Do not conclude it by pressing “ Enter”.
A Answer Command
This command instructs the modem to go off-hook and answer an incoming call.
Summary of Contents for 5634PCV
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