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COMSPHERE 3800Plus Modems
13-2 November 1996 3980-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 suffix, 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). Appendix B lists
result codes with numeric and word equivalents.
Any-Key Abort
The any-key abort function aborts a call establishment
attempt when a character is received from the DTE under
the following conditions:
• The A
T command set is enabled.
• The modem is in the process of answering or
originating a call.
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 13-1 lists all A
T commands supported by the
3800Plus 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
reference to locate commands in Chapters 4 through 10 if
further description is necessary.
AT Command Format
AT
commands are entered in Command mode using the
following format:
TYPE: ATXn
Where: X
is the A
T command and n
is the
specific value for that command.
PRESS: Enter
In Table 13-1, the value for X
is listed in the
AT
Command column and the value for n
is listed in the
Description column.