COURIER HIGH SPEED MODEMS
CHAPTER 4. DATA MODE OPERATIONS
The information in this chapter applies to asynchronous calls only. For synchronous operations, refer to Appendix F.
Detailed command descriptions are in this chapter. Additional command summaries are in Appendix C, on the bottom panel of the modem, and in the
COMMAND SET USAGE
The Courier command set enables you to send the modem two kinds of instructions:
•operations, such as dialing or hanging up
•configurations, such as enabling error control or data compression
Follow these guidelines:
1.Your software must be loaded and, if you are using a computer, it must be in Terminal mode.
Some communications programs put the computer in terminal mode automatically when they are loaded. Others require you to display a communications terminal screen, press a Function key, or perform some other operation. Refer to your communications software documentation for instructions.
In Terminal mode the computer acts as if it were a stan- dard terminal such as a teletypewriter, rather than a data processor. Keyboard entries go directly to the modem, whether the entry is a modem command or data to be transmitted over the phone lines. Received data is output directly to the screen.
2.Type commands in either upper or lower case, not a combination (AT or
Data Mode Operations
