Modem Operation |
The AT command set
All instructions to a modem are sent using AT commands— commands that begin with the letters AT. The AT tells the modem, “Attention! A command is coming.” In the AT command set, the AT is followed by one or more commands and ends when you press the Return key. Pressing the Return key tells the modem that the command string is complete and should be executed. AT commands are normally issued by your communications software, but you can also send them directly from your keyboard. Refer to your communications software manual for information on how to issue the AT commands in command mode.
Using AT commands
Follow these steps to use AT commands:
1.Launch your communications software. Be sure your communi- cations software is in terminal mode.
2.Be sure the ISDN modem is in command mode so that it inter- prets your commands.
When your computer is powered on, the ISDN modem automatically starts in command mode. If you have recently used the ISDN modem to make a call and have not yet disconnected, type +++ to switch to command mode.
3.Type
AT <commands>
Then press the Return key.
After completing its tasks, the Netopia ISDN Modem sends a message, called a result code, to the screen.
Result codes
After a command is sent and executed, the Netopia ISDN Modem sends a “result code” back to the computer. The result code tells the computer if the command was successfully executed and may include other information. For example, OK or ERROR may appear
