Troubleshooting 81
Modem Commands
The Modem includes the basic commands used by the Smart Modem of the Hayes
Corporation. Some additional commandshave been added to it to improve its capacity.
What are AT Commands?
AT commands are the control commands of Fax modems developed by the Hayes
Corporation. AT commands are the industry standard and necessary for any fax
modem. It is used with the S-register to set the modem status.
Generally, AT commands are used by directly entering the command into any
communications program, like Hyper terminal.
You can do the jobs below more easily by using AT commands.
•
Calling up or hanging up the phone in order to communicate by Computer
modem
•
Choosing a modem in order to make the most efficient communication status.
But,as the communication programs are becoming more efficient and more intelligent
nowadays, users do not have to know all the AT commands. Only a few basic
commands are enough for computer communications.
Before Using AT Commands
AT commands can be used by entering them into terminal-based communication
programs directly. (Hyper terminal, CrossTalk, Procomm, etc.)
CompuServe, America On-line applications are not terminal-based communication
programs, but they are the communication programs based on aGraphic environment.
This kind of program can initiate the modem setting by entering ATcommandsin a
menu having a modem initialization command.
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 communicatewith others
by connecting to other modems. You can call this status Data mode or On-line mode.
Maverick Plus Users Manual.fm Page 81 Friday, March 2, 2001 4:10 PM
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