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COMSPHERE 3825Plus Modem
4-2 November 1996 3825-A2-GB30-20
To enter online Command mode while in Data mode,
enter the following sequence:
TYPE: +++
Use the O command to return to Data mode from
online Command mode. Enter the following command:
TYPE: ATO
PRESS: Enter
Command Guidelines
Review the following guidelines before using any
A
T Commands.
•
The escape sequence (+
+
+) is used to enter online
Command mode from Data mode.
• The asynchronous character format for the
AT command set must be one of the following:
—
8 data bits + no parity + 1 stop bit.
—
7 data bits + no parity + 2 stop bits.
— 7 data bits + parity + 1 stop bit (parity can be
odd, even, mark, or space).
• All commands (except A/ (repeat last command)
and (+ + +) must begin with the characters AT and
end by pressing the Enter key. The AT (or at) prefix
clears the command buffer and matches the modem
speed and parity to that of the DTE. Commands can
be upper- or lowercase, but the modem will not
recognize mixed case prefixes (At or aT).
•
Commands can be entered one at a time or in
strings. Strings can have up to 40 characters after
the A
T prefix. Y
ou can use spaces, hyphens (-), and
parentheses ( ) as fillers to make the commands
easier to read; the modem ignores these fillers and
they are not counted among the characters which
make up the command string. Commands must be
entered on one line and end with the return
character (Enter key).
•
Commands with the suf
fix n
have several options
associated with them. For example, in the Ln
command, L1 sets the speaker volume to Low and
L3 sets the speaker volume to High. Omitting the
suf
fix has the same ef
fect as using a zero suf
fix; for
example, A
TX is equivalent to ATX0.
• The A/ command (without pressing the Enter key)
causes the modem to repeat the last command
entered.
• Valid commands are acknowledged with numeric or
word result codes (unless the result codes have
been disabled using the Q1 command).
Appendix A lists all available result codes with
numeric and word equivalents.
AT Command List
AT commands are issued from an asynchronous DTE,
such as a PC, and control the modem’
s operation and
software configuration. AT commands are only applicable
when the DTE Dialer Type configuration option is set for
AT. (See &Mn and &Qn commands.)
AT commands are entered while the modem is in
Command mode and use the following format:
TYPE: AT Xn
Where: X
is the A
T command and n
is the specific
value for that command.
PRESS: Enter
T
able 4-1 lists all A
T commands supported by the
3825Plus modem. The Async Dial factory default is listed
in bold.
Reference to particular country codes in this guide is
not an assurance that the modem has been approved for
use in that country
. Consult your sales representative.
Not all commands are valid in all countries. See
Appendix F.