Using the Modem 45
What you have to know before using AT commands is that there are two kinds of
modes when you use it.
Command mode:
If you turn on your computer and start communication by a communication
program, you can see a prompt on the terminal screen. Under such conditions, you
can use AT commands like calling, etc.
DATA Mode
In command mode, you can call by using AT commands and communicate with
others by connecting to other modems. You can call this status Data mode or On-
line mode. In data mode, You can't use any AT commands except the +++
command, which has +++ at the head.
If you stop communication and disconnect the phone, the Fax modem will run in
command mode again.
Using Command Mode during Communications
Sometimes, you have to use AT command while you're communicating with
others via modem. In this case, you can use +++ command for AT command
without hanging up your telephone. Pressing '+' three times makes fax modem
change to command mode. Of course, the telephone is not disconnected. (Don't
enter Enter key after input +++)
Connection may be lost depending on the server.
If you want return to Data mode from command mode, you only have to input ATO
and press the Enter key to start the communications again.
The mode can not be transfored from the command mode to
data mode depending on the server.
Using AT commands
AT commands can be used in the following way. There's no difference between
capital letters and small letters, and all commands should include 'AT' as a prefix
except ones, which includes 'A/' instead.
