Chapter 3 - Basic Modem Operation; Understanding At Commands; Using The Windows 95 Hyper Terminal Program - ZyXEL Communications Omni 288S User Manual

Chapter 3 - Basic Modem Operation

Chapter 3 - Basic Modem Operation
This chapter covers the basic commands and techniques involved in modem
operation. In many cases, this is the only information you will need in order to get
your Omni 288S up and running with communication software, and to start making
connections with your Omni 288S.

Understanding AT Commands

The Omni 288S communicates asynchronously with computers using AT
commands. AT commands are used to configure and control the Omni 288S.
Commands are usually sent to the modem by way of communication software, but
can also be entered manually by the user with the computer keyboard.
Command statements must be written in a specific form in order for the Omni
288S to recognize them. A command statement always begins with the letters AT
or at. It is then followed by one or more commands and the <Enter> key.
AT commands can only be issued when the Omni 288S is in "command mode" or
"off-line."
Once the Omni 288S has established a connection with another modem it is said
to be "on-line" or in "data mode." In this mode, the characters sent to the Omni
by your computer are transmitted to the remote modem rather than being
interpreted by the Omni as commands.

Using the Windows 95 Hyper Terminal Program

In order to issue an AT command statement, you first need to run a communication
program such as the Microsoft Windows "Hyper Terminal" program. This
program provides a simple method to manually enter AT commands so you can do
such things as "customize" the settings of your Omni 288S, or store phone
numbers you commonly will connect to.
Once the Omni is connected to your computer's serial port and telephone line,
Open the Windows 95 "Accessories" program group, and open the Hyper
Terminal Program.
The program will prompt you for a name and Icon to use for your new connection.
Type the name Test Connection and press <Enter>.
Next, you will be prompted for country information, area code and phone number,
and the device used to make the connection. For this test purpose, do not enter a
phone number; simply choose the COM port your Omni is connected to from the
"Connect Using" list. Click "OK" when finished.
The next window sets the COM port settings. The settings used for The Omni
288S should be as follows.
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