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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.4.4
Control format
4
Description
To read data
rom the PC
>PU to the
:ompuler
T o write data
ram the
:ompuler to
he PC CPU
St. No. :Station numbe
Control Protocol
Transmission sequence
u
N a
R
F
H L H
L
1 "
("
I"/"$
H L H L H L
*
or
-
Transmission sequence
E
compufm
"
l " L
q l " : ' ~ c , ~ ~
code
R F
H L H L H L
(1)The sum check is enabled by DIP switch 12.
The sum check code only exists when the sum check is enabled by turning DIP switch 12 ON.
(2)The sum check is made for characters marked
"*"
in these diagrams.
AlSJ71C24
;
5
(3)ln these diagrams, the contents of "character area
A ,
'character area
0 ,
and "character area
(
depend on the individual system.
For details, see the relevant sections.
The contents of
i
character areas are the same for all 4 formats.
st.
NO
H , L
A
$
AISJ71C24
PC
NG
H , i
St.
NO.
H , L
St.
No.
H , L
1 4 1 ' 1 ' 1
corn-
marc
H , L
st.
NO.
H . L
age
wantime
characte
a i e a ~
PC
NO.
H , L
PC
Na
n,
L
PC
NO.
H , L
ZZk
& ,
H , L
c
L
, ,
,
Corn-
mand
H , L
C
L
,
,
C
L
,
charactm
area8
Message
wa,,t,me
*
ZZk
&
H , L
Character
areac
; k m k
_de
H , L
,
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