User's Manual

2 - COMMAND REFERENCE
This chapter provides an alphabetized reference with examples for all commands for the modem. The
system of commands is depicted below in Figure 2-1.
To use these commands for dialing or configuring the modem, make sure the communications software
package you will be using lets you operate the modem through its internal commands. If your software
permits use of the modem's internal commands, read this chapter. If not, read your software user's manual
and ignore the rest of this manual.
2-1 General Command Information
Except for the A/ command and the +++ escape command described in Section 2.4, all commands must be
prefixed with the attention code AT. For instance, the A command (below) would be entered as: "AT
A<CR>". Without the AT prefix, the command line cannot be executed. Once entered, AT cannot be
deleted with the Backspace or Delete key.
More than one command can be placed on a single line and, if desired, separated with spaces for
readability. Once the carriage return (Enter) key is pressed, the command line is executed. A line with no
carriage return is ignored.
The modem accepts either upper or lower case characters in the command line and ignores any spaces
within or between commands. Typing errors can be corrected with the Backspace key. Exceptions are
noted in the description of specific commands.
Variables (r and x) are listed in Italics. Punctuation symbols (, ; ! @) use as dial modifiers are listed
alphabetically according to their English names at the beginning of Section 2.3. Where two commands are
separated by a slash, either command will have the same effect. For example, if the command is listed as
B0/B, issuing either B0 or B will have the same effect.
2-2 AT Commands
A Go On-line in Answer Mode
This command instructs the modem to go off-hook immediately and then make a handshake with the remote
modem. Handshaking is not available during leased line operation.