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AT Commands for the MT5656ZDX, MT5600ZDX, MT5600BA/BL-Series Modems

Multi-Tech Systems, Inc. Commands Reference Guide (PN S000273D)

AT Commands Introduction

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: Type +++ and

wait for the OK response; then issue the hang-up command by typing ATH <CR> (<CR> indicates that you must click

Enter). To return to data mode from online command mode, type the command ATO.

To send AT commands to the modem you must use a communications program, such as the Phone Tools, a

communications program included with your modem, or HyperTerminal in Windows 95, 98, NT 4.0, Me, 2000, XP. 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 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 Commands” section, 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 the “Result Codes” sections of this manual.

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.

Note about the LED graphics.

The graphics are labeled MT5600BA. This stands for the MT5600BA-Series and includes the MT5600BA and the

MT5600BL.

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Multitech BL-Series Manual de usuario Pagina 4