Omni.Net Lite User’s Guide

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.

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.

 

 

 

 

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.

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

2Open the HyperTerminal program in Windows. For example, in Windows XP click Start, Programs, Accessories, Communications, HyperTerminal.

Chapter 3 Using AT Commands

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