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MT5634ZBA-USB User Guide

AT Commands

AT commands are used to control the operation of your modem. They are so called

because each command must be preceded by the characters AT to get the ATtention of

the modem.

AT commands can be issued only when the modem is in command mode or online

command mode. The modem is in command mode whenever it is not connected to

another modem. The modem is in data mode whenever it is connected to another

modem and ready to exchange data. Online command mode is a temporary state in

which you can issue commands to the modem while connected to another modem. To

put the modem into online command mode from data mode, you must issue an escape

sequence (+++) followed immediately by the AT characters and the command, e.g.,

+++ATH to hang up the modem. To return to data mode from online command mode, you

must issue the command ATO.

To send AT commands to the modem you must use a communications program. You can

issue commands to the modem either directly, by typing them in the terminal window of

the communications program, or indirectly, by configuring the operating system or

communications program to send the commands automatically. Fortunately,

communications programs make daily operation of modems effortless by hiding the

commands from the user. Most users, therefore, need to use AT commands only when

reconfiguring the modem, e.g., to turn autoanswer on or off.

The format for entering an AT command is ATXn, where X is the command and n is the

specific value for the command, sometimes called the command parameter. The value is

always a number. If the value is zero, you can omit it from the command; thus, AT&W is

equivalent to AT&W0. Most commands have a default value, which is the value that is

set at the factory. The default values are shown in the “AT Command Summary,” which

begins on the next page.

You must press ENTER to send the command to the modem. Any time the modem

receives a command, it sends a response known as a result code. The most common

result codes are OK, ERROR, and the CONNECT messages that the modem sends to

the computer when it is connecting to another modem. For a table of valid result codes,

see “Result Codes” at the end of this chapter.

You can issue several commands in one line, in what is called a command string. The

command string begins with AT and ends when you press ENTER. Spaces to separate

the commands are optional; they are ignored by the command interpreter. The most

familiar command string is the initialization string, which is used to configure the modem

when it is turned on or reset, or when your communications software calls another

modem.

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