ZyXEL Communications ISDN Terminal Adapter Omni.Net Lite, User Manual

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Omni.Net Lite User’s Guide
Chapter 3 Using AT Commands 52
C
H A P T E R
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.