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COMSPHERE 3800 Series Modems
14-2 November 1996 3810-A2-GB30-20
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 AT
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 A
T 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 carriage 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. If no value
is entered for the n suf
fix, the modem assumes a
zero (0) value.
• 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). (See Appendix B
for a list of 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.)
T
able 14-1 lists all A
T commands supported by the
3800 Series modem. The first column lists the AT
command. The second column defines and lists all
possible values for that command. The Async Dial factory
default is listed in bold. The third column lists the key
sequence used to enter the equivalent front panel
command. Use this to reference commands in Chapters 5
through 12 if further description is necessary.