Motorola SM56 At Commands Reference Manual - Page 4

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Motorola SM56 At Commands Reference Manual
AT Commands -
Basics
+++ (Plus-Plus-
Plus) Commands
-2
Attention (AT) commands are the means by which you control and monitor a
modem. Typically, the communications application automatically issues them, and
you need not know the commands and their options.
However, to custom-configure the modem for an application, or to optimize
performance, you can issue commands through the communications application
yourself. In most communications applications, there is a menu item, or option, for
entering extended or custom AT commands. See your communications application
documentation.
You can also configure the modem by issuing AT commands directly from a simple
terminal-emulation application. One such application is HyperTerminal, which is
present on computers that have Windows.
To issue an AT command from the terminal-emulation application, you must ensure
that the modem is in command mode (in which it can detect and respond to
commands), rather than data mode (in which it is transmitting and receiving data). To
enter command mode from data mode, enter +++. You need not press the ENTER
key.
When entering AT commands, the following basic rules apply:
• AT commands can be entered in uppercase, lowercase, or mixed text
• The characters AT begin all AT commands, except A/ and +++
• The key used as the ENTER key is specified in S-Register S3
• The maximum command length is 64 characters.
You can enter more than one AT command on a line, and you can chain commands
using just one AT at the start. However, some commands must occur at the beginning
or end of the command line.
This command, known as the escape sequence, causes the modem to stop
transmitting data (if it is doing so), and go into command mode.
Issue this command at the computer keyboard, in the communications application's
terminal window, by typing the plus sign (+) three times.
Note
Do not press the ENTER key after the +++ command. It may cancel the
command.
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