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MultiModemBA User Guide
4.4.12 Immediate Action Commands

Help Screens $H

The Help command is designed to give you short explanations on how to use each modem
command. The Help command can be quite useful if your manual is not handy and you are in the
middle of a communications session. Although the explanations are quite abbreviated compared to
those in this manual, they should prove to be helpful reminders when needed.
At the time of this writing, we have three screens of Help information (Screen #1, #2 and #3), and
more screens may be added in the future. The Help commands are structured so that you can call up
one of three Help screens, as follows:
AT$H1 = Help Screen #1
AT$H2 = Help Screen #2
AT$H3 = Help Screen #3

Inquiry for Product Code I

Some systems or software packages automatically check the
“identification”
of the modem with which
they are communicating, by using the I command. This
“read”
command lets the software to
determine the type of modem with which it is communicating.
When
ATI
or
ATI0
is entered, the modem responds with
247
. When ATI1 is entered, the modem
responds with a three-digit code indicating the firmware version number. When ATI2 is entered, the
modem responds with
MT2834BA, MT1432BA
or
MT932BA
depending on model.

Windows 95 Autodetect Inquiry I9

This read command permits a Windows 95 operating system to query the MT2834BA's
characteristics. When
ATI9<CR>
is entered the symbols
BA 28800 FAX CT
are displayed; which
indicates to the Windows 95 system that your particular modem is a
MT2834BA, 28,800 bps, fax
Class 2
capable modem. With autodetect support in your MT2834BA, your PC can automatically
allocate resources and configure it and other devices. The MT2834BA implements autodetect
capability in the form of a single
.INF
(Information) file that specifies AT Command mode and Result
Code "Registry Keys" that are specific to your MT2834BA.

Listing Current Operating Parameters L5 L7

The
L5
and
L7
commands list the current operating parameters of your modem. This information can
be very useful when you are changing communications software or when you are changing modem
default settings.
The command to list the modem’s current operating parameters is
ATL5
for the basic parameters.
Entering
ATL7
lists additional parameters on the modem.

Listing S-Register Values L6

Entering
ATL6
lists the current values stored in the modem’s S-Register. This information can be
very useful if you wish to change S-Register values.

Listing On-Line Diagnostics L8

The
L8
command displays the current on-line
CONNECT
status of the modem. This display can be
printed and used as a modem status report or as diagnostic information (such as when calling Tech
Support). To activate this command first type
+++AT<CR>
(
on-line escape command while
maintaining command mode
), then type
ATL8
. What then displays on your monitor is your modem's
current on-line condition (e.g., Link Type, Line Speed, Serial Speed, Type of Error Correction/Data
Compression, Number of past Retrains, etc.).