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Chapter 3 Using AT Commands 54

CHAPTER 3

Using AT Commands

3.1 AT Commands Overview

An AT Command is a command in asynchronous data format issued by the computer to the

ISDN TA through the asynchronous computer-modem interface. AT commands are used to

configure and control the TA by typing commands at a computer or terminal keyboard. To

send an AT Command from a computer to the TA, you must run a communication software

program and the TA must be in command state.

Commands must be written in a specific form in order for the TA to recognize them. A

command begins with the letters “AT” or “at”, followed by one or more printable characters

and then ended by pressing [ENTER], as shown in the following example.

Note: AT commands can only be issued when the computer or terminal is connected

to the TA with an RS-232 cable.

3.2 Accessing the TA Example

To configure the TA by terminal emulation program, you need a terminal emulation program

first, such as Hyperterminal in Windows.

1 Make sure your TA hardware is properly connected (refer to the Quick Start Guide).

2 Open the HyperTerminal program in Windows. For example, in Windows XP click

Start, Programs, Accessories, Communications, HyperTerminal.

Table 13 Examples of AT Command

COMMAND OPERATION RESPONSE

AT<Enter> To verify that the TA is online with your terminal or computer. OK

AT I3 To display the version of the current firmware.

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ZyXEL Communications omni.net Guide de l'utilisateur Page 55