Videotex
and
the Modem
11
Videotex
software
packages
that allow
you to communicate with
an
information service or with
other Videotex
users over
the
phone, are available
for TRS-80
Models I,
II, III, and Color
Computers.
For specific
details on
using an information
service
once you've established
communications,
refer
to your information
service
user's guide.
Color Computer
users
should always
remember
to set the FORCE DTR
Switch to
ON.
We
suggest that other
TRS-80
users also
keep the FORCE
DTR set to
ON unless your
program
explicitly
calls
for FORCE
DTR to
be OFF.
MANeal/QRlGInate
Operation
The most
common (and
probably the easiest) method
of calling an information service
is when
the MODE Switches
are set
to MANual and ORIGinate.
In this mode,
you'll need to be next to
the Modem and Computer when
you are using Videotex
(e.g., "attended use").
Once the program
is loaded, you must dial
the information service
and
begin communication.
To use the
Modem II
in MANual/ORIGinate Mode, follow
these steps:
1
.
Set the FORCE
DTR Switch
(on the back of the modem)
to ON.
2.
Be sure the switches
on the front
of the modem are set to the following:
r
POWER
\»
mi
aNs
\J
\
o o o o
o o
ON OH
TH CD
TO nD
J
f^~\
REIVI
v_/
OFF
LDC
J
3. Load
the
VIDTEX
program
as described in your Videotex User's Guide.
4. Pick
up the telephone receiver
and dial the information service phone number.
5. When
the information service answers
the phone, you
will
hear a high-pitched tone.
6. Set the Modem's
POWER Switch
to ON. The RD light
will
then come on.
Next, the CD
light will illuminate and,
after a
two
second delay,
the
RD light will go off.
At the same time,
you'll hear a low-pitch tone.
7.
Gently hang up
the phone.
You
can then begin following
the instructions detailed
in your
Videotex
and information
service
user's guide.
10
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