~
Acoustic
Telephone
Acoustic
I·
#523
..
LJix-lO
Coupler
Line
Coupler
~I
Telephone
Acoustic
I·
..
I Modem
1
#523
Other remote
Coupler
Line
Micro, Mini
or
Mainframe
For
an
explanation
of
RS232C communication see Chapter 4.
SOFTWARE
The two utility programs available
on
the PX-8 are TERM and
FlUNK.
Vari-
ous other communications programs are available which work in roughly the
same way, and you should consult their respective manuals for instructions as
to their use.
3-76
3.9.1.
TERM
The TERM utility
is
used when it
is
necessary to
'talk'
to
a remote computer,
using the PX-8 as a terminal, sending single files in either direction
or
simply
using
both
as
'dumb'
messengers.
In
the following descriptions the second com-
puter
is
assumed to be
an
EPSON
QX-1O (MultiFont
CP/M
version) for the
sake
of
clarity, but equivalent software may be used
on
other machines for this
type
of
communication.
The first thing to do
is
make sure the PX-8
is
connected to the required exter-
nal devices using the relevant cables, then load the TERM program from the
appropriate drive.
When
TERM
is
run
the screen shows the following:
The
RS-232C
status
is
:
bit
rate
=
4800
data
bits
= 8
stop
bits
= 2
parity
=
NONE
Use
CONFIG.COM
program
to
change
the
RS-232C
status.
Modes
of
TERM
1 =
Normal
2 =
Delete
LF
after
CR
(send)/
Insert
LF
after
CR
(receive)
3 =
Insert
ETX
and
Delete
LF
after
CR
(send)
Select
a
mode
1
The
top
line
of
the screen shows the default RS232C settings (they may not
be the same as the ones shown here). These can be changed using the CONFIG
program and should be set before running the
TERM
program. Make sure the
receiving computer has the same settings, and change one
or
other machine's
settings so
that
they agree.
The three options given
on
the screen refer to how
data
is
sent and received.
i)The default
is
option 1 which merely requires you
to
press the
key, and sets the computer to send and receive
data
without any
modification. This
is
the most commonly used setting.
ii)Some computers automatically add a line feed
to
any carriage return in
the
data
they receive, so in this case you would select Option 2 (delete
LF). This will have the effect
of
deleting line feed codes (ASCII code
10 decimal; hexadecimal
OA)
following carriage returns (hex
OD)
during
transmission,
that
is, when sending data.
It
also adds a line feed code
immediately after any carriage return code in received data. Remember
that
a carriage return merely moves the cursor
to
the beginning
of
a
line - it
is
the line feed code
that
moves it to the next line down.
3-77
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