Boca EXPRESS 14.4, User Manual, Page: 21 / 52

20
21
Command/Protocol Reference
Appendix A: 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 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.
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.