CSMIM-T1 Hardware Installation Guide 7-1
CHAPTER 7AT COMMANDS AND REGISTERS
This chapter contains the following sections:
•The Command Set
•Entering Commands
•Issuing AT Commands at any Speed
•Command Descriptions
•Register Descriptions

7.1 THE COMMAND SET

The modem responds to a superset of Hayes Smartmodem commands.
(Additional commands use the prefixes $, %, ), *, -, :, @, and \.) The
modem also stores configuration settings in a set of registers. These are
similar to the Hayes Smartmodem registers, although some have
enhanced modem features.

7.1.1 Entering Commands

Each command line must begin with the characters AT (the ATtention
code). Both characters of the attention code must be in either upper case
or lower case, but you may type the commands in any combination.
Type commands after the OK response. The modem ignores spaces
between characters. If you make a mistake press the backspace key
( Cntrl-H ) and type the correct character. To make a command take effect,
press <Enter>.
NOTE Factory defaults for commands and registers work with many
installations; you may never need to change the default
settings.