ZyXEL U-336R User Guide - Page 27

Basic Modem Operation

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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 up and running with communication software, and to start making connections with your modem. Understanding AT Commands The U-336S/SA communicates asynchronously with computers using AT commands. AT commands are used to configure and control your modem. 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 your modem 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 key. AT commands can only be issued when your modem is in "command mode" or "off-line." Once your modem 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 your modem by your computer are transmitted to the remote modem rather than being interpreted by your modem as commands. Basic Modem Operation 13

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Basic Modem Operation
13
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 up and running with communication software, and
to start making connections with your modem.
Understanding AT Commands
The U-336S/SA communicates asynchronously with computers using
AT commands. AT commands are used to configure and control your
modem. 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
your modem 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 your modem is in “command
mode” or “off-line.”
Once your modem 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 your modem by your computer are transmitted to the remote
modem rather than being interpreted by your modem as commands.