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Appendix C: Modem Command Reference

In most cases, your communications software will set and

control the operation of your modem. Following is a brief

survey of the most commonly used Hayes-compatible AT

commands for use with your modem. In addition, we’ve also

provided information on extended AT command sets, S-

Registers, and commands and registers for high-level

protocols such as MNP, V.42/V.42bis, and V.32/V.32bis.

It will rarely be necessary to use ‘AT’ commands and S-

Registers in command mode. We include them here for more

advanced users who may prefer command mode operation,

or require special settings. See pages 31-57 for additional

details.

Hayes-compatible commands consist of a basic command set

and an extended command set. The basic set involves

functions such as dialing a number, or putting the modem

on-hook (i.e., replacing the telephone handset).

Extended commands allow more sophisticated control of the

modem such as transmission speed, or initiating high-level

functions like data compression or error correction. These

functions are defined and controlled by the available

protocols mentioned above. A protocol is a set of standards by

which data communications operate.

Every AT command includes an “AT” prefix, followed

immediately by the command and, in many cases, additional

parameters. Multiple commands can be entered at the same

time from your communications software.

AT Command[parameter) [parameter] ...

PRESS ENTER

Modem Command Reference

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