Introduction
With the Tandy direct-connect, 300-Bps Intelligent Modem DCM-7, your
computer or data terminal can communicate with other computers
or
termi-
nals using ordinary telephone lines.
The DCM-7 accepts data from a computer, converts the data into two-
frequency tones and then sends the tones over telephone lines
to
another
modem. Conversely, the DCM-7 accepts tones from telephone lines and
changes those tones into
data
that your computer understands.
This direct-connect, Bell 103-type modem
is
not only designed with standard
automatic dial, answer
and
disconnect features, but also a wide range
of
system configuration enhancements
as
well. Its microprocessing unit (MPU)
provides operation in both Tandy and Hayes protocol modes -each selec-
table
at
the flip
of
a
DIP
switch.
In the Hayes protocol mode, your Modem
is
AT-compatible and capable
of
running with Hayes software. Special command instructions and registers
in Hayes protocol allow you
to
program the DCM-7 from your computer
keyboard for the same operational modes used in Tandy protocol.
For example, you can set the DCM-7 for manual originate
or
manual answer
mode,
in
which you manually dial the telephone number or answer an
incoming call when you are contacting a remote computer.
Or
you can pro-
gram the DCM-7 for auto-originate or auto-answer mode and let the DCM-7
dial the telephone number
of
a remote computer or answer
an
incoming call.
In either Tandy
or
Hayes protocol, the DCM-7 can be programmed to
perform operations such
as
automatically seizing the telephone line after a
specified number
of
rings and automatically redialing a phone number when
communication
is
not established.
Another feature
of
the DCM-7
is
a built-in monitor speaker which enables
you to monitor audibly the dialing and data communication progress. The
situation
is
reported visually
on
your display with messages called results
codes.
Sample programming sessions are provided in each section
of
this manual
to help familiarize you with the various functions
of
the DCM-7 and to get
you started using your Modem
as
quickly
as
possible. After you have become
familiar with the manual and your Modem, the handy Quick Reference Card
should keep you "up-and-running!"
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