Introduction
The
term
RS-232-C refers to a
specific EI A (Electronics Industries
Association) standard
which defines a widely accepted method
for
interfacing
data terminal equipment
with
data
communications
equipment.
The RS-232-C
Interface is
by
far the most universally
used
standard for interfacing data
processing equipment. Most
video
terminals,
modems, card readers,
line
printers, mini-microcomputers,
etc.,
utilize the
RS-232-C standard for data interchange
between
devices.
The
addition of
the RS-232-C to the
TRS-80 Expansion Interface
opens up a whole
new world of
compatibility. The RS-232-C
Interface is
designed
to
mount inside the
TRS-80 Expansion
Interface.
For example, the external
equipment could be
a
serial
line
printer, a
Radio
Shack
Telephone
Interface, or a video
terminal,
etc. The point is this, now
you can interface with any equipment
which
is
RS-232-C compatible.
A most
useful application
program of the
RS-232-C Interface will
permit you to
connect your
TRS-80
via
a Telephone
Interface to
time
sharing computer system. This
TERM
program is supplied
(on cassette tape)
with the RS-232-C Interface.
Many TRS-80 owners
would like to
be able
to
use their serial
printers
with the
LPRINT command in
LEVEL II BASIC. With the RS-232-C
Interface
installed in the
Expansion Interface, you can do
that. A
programming
example and listing
for this application is
provided
in
this
Manual.
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