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Sample Programming Applications
A
Videotex Plus
communications package for TRS-80 Model II, 12, and
16
microcomputers
is used
in the sample programming
sessions
following. With this
package
,
you are able to communicate with a
variety
of information
services
and
host
computer systems. The examples
are
designed to familiarize
you
with some of
the
operations
the modem
is capable of performing
.
A
log-on
session gets you started by
showing how
the modem is used
to log
on an
information service
.
The remaining
sessions
demonstrate
how
you can program
the
modem
to
perform
operations
,
such
as
dialing your
calls
and
answering the phone
automatically
.
Additionally
,
you will
learn how the
advanced programming options are
used
to enhance automatic operations.
Programming the modem . ..
All modem functions are controlled by ASCII encoded commands
that
you send from
your computer
keyboard
.
A
two-key
code sequence called
the
wake-up command
is
used
to open the modem for programming. (See
Wake
Up,
DC-2212!
for an
explanation of the importance of this command
's
function
,
page 13.)
When this two-key code sequence is issued, the DC-2212 automatically adapts
the
speed,
word length
,
number bits
,
and parity of your computer.
When
answering calls,
the
modem adapts
to
the speed, word length
,
number
bits, and parity of
the
calling
modem
.
l
.
Check again that all peripherals are correctly
connected (Connecting the Modem
page
35)
and receiving power.
2.
Flip
the
power
switch
on
the
modem
's
front panel
to the
ON position. Carrier
Detect
(CD) indicator lights
.
3.
Load
and
run the Videotex
Plus
communications program as described in your
user's guide.
4
.
At TR
SD
0 S Re
ad
Y
,
type
l.JI
D
T
Ei<
(ENTER).
Terminal
Ready
(TR) indicator
lights. The
screen shows:
t.!IDTD(
01,00.00
CoPYri9ht
1983
Tandy
Corp,
Al 1Ri9hts
Rese nied
6
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