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Radio Shack TRS-80 PC-2 - Page 8

Radio Shack TRS-80 PC-2
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Message:
Meaning:
: CHECK 8
Check
the
RS-232C Interface
for
proper
connection
or
possible
recharging.
NEW0?
Check
the
system
for
proper
con-
nection
or
possible recharging.
: CHECK
68
RS-232C
and
Printer/Plotter/
Dual Cassette
Interface
battery
packs are low.
ERROR
5(,1
Low
power
during
BASIC pro-
gramming.
LOW
BATTERY
Low
power
during
Terminal
Mode
operation.
Table 1
When
one
of
the
above messages
is
displayed, recharge
the
battery
pack.
Using AC Power
To
use
the
RS-232C Interface with
AC
power,
connect
the
Adapter
(See
"Powering-up
the
PC-2 RS-232C Inter-
face")
and
turn
the
power
on.
Once
connected
to
the
PC-2
and
powered
up,
the
power
to
the
RS-232C Interface can be
controlled
by
the
Computer.
•
After
turning
the
RS-232C's
power
ON,
turn
the
PC-2
ON.
(:
CHECK 8 will be displayed if
you
don't
follow
this
order.)
Power
is
then
supplied
to
the
unit.
• When
you
turn
the
PC-2
off,
the
RS-232C
power
is
also
turned
OFF.
• When
not
using
the
RS-232C Interface,
set
the
unit's
power
switch
to
OFF.
10
3/
Using
the
PC-2
RS-232C
Interface
The
RS-232C Interface has its
own
set
of
commands
and
functions
("software")
which
control
data
communica-
tions
with
other
devices. However,
the
execution
of
commands
and
functions
will
not
be successful unless
"hardware"
is
properly
configured.
Specifically, this
means
that
the
input
signals:
• CTS (Clear
To
Send)
• CD (Carrier Detect)
• DSR (Data
Set
Ready)
must
all be
"ready."
• Use
the
INSTAT
command
(described later)
to
check
the
status
of
these
signals.
• Use
the
output
signals
commands
RTS and DTR
to
tell
the
status
of
Interface
to
the
other
device, are
OFF
at
initial
power
on.
(See OUTSTAT.)
Important
Note:
The
PC-2
must
always be
connected
to
the
Interface
when
programming
with
the
RS-232C
commands
and
functions.
Also,
the
Interface
must
be
connected
to
the
PC-2
when
you
list
or
execute
such
programs;
otherwise,
an
error
message
or
- (tilde) will
be
displayed.
The
RS-232C Interface provides
extensions
to
PC-2
BASIC as well as a
smart
terminal program
in
ROM.
These new
commands
fall
into
four
general categories:
•
Control
statements
for
the
RS-232C
hardware.
This
group
allows
you
to
configure
the
RS-232C
hardware
and
built-in terminal
software
for
communication
with
various devices.
11

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