8.
COMMUNICATIONS
USING
DEDICATED
PROTOCOLS
MELSEGA
8.4.4
Control
format
4
St
No.
:
Station number
Description
To read data
from the
PC
CPU
to the
computer
To
write date
from the
computer to
the
PC CPU
Remarks
Control
Protocol
Transmission sequence
-t
HLH L
or
N71Q4
or
No'
-RF
HLHLHL
rJrtQ4
L
Transmission sequence
or
HLHLHL
(1)The sum check is enabled by
DIP
switch
21.
(2)
The sum check is made
for
characters marked
'*"
in
these
diagrams.
(3)
In
these diagrams, the contents of 'character aroa
A',
'character area
B",
and 'character area
C"
depend
on
the individual system.
For
details,
8.0
the relevant wctions. The contents of
all
character areas are the same for all
4
formats.
The sum check code only exists when the rum check
is
enabled by turning
DIP
switch
21
ON.
.-
-
Y
7
u
-,
.4
d
7
I
8-
10
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