Motorola SM56 User Manual download pdf (Page 4)

AT Commands -

Basics

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 such as ZTERM and PowerTerm.

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.

Some of the AT commands and options are product specific and may not be

applicable to the product you are using.

+++ (Plus-Plus-

Plus) Commands

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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Motorola SM56 User Manual Page 4