Using the Modem 55
Modem Commands
The SENS Modem includes the basic commands used by the Smart Modem of the
Hayes Corporation . Some additional commands have 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 a
Graphic environment. This kind of program can initiate the modem setting by
entering AT commands in 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
