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Appendix E: Command/Protocol Overview
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 49-75 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] ...
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