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8.
COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.4.2 Control format 2
To read data
rom the PC
:PU to the
:ompuler
St.
No.
: Station r
Transmission sequence
-
D e s c r i p t i o n
C o n t r o l P r o t o c o l
H L H L H L H L
.
or
To write data
i o m the
:ompuler to
he PC CPU
Ccmpner
A Block
Sf.
PC
Err08
H L H L H L H L
computer
(1)The sum check is enabled by DIP switchl2.
The sum check code only exists when the sum check i s enabled by turning DIP switch 12
AlSJ71C24
2
810ck
NO.
H , L
lumber
-
-
-
ON.
xrea C
j
of all
-
S t
No.
H , L
Characts
areaA
A
;
AISJ71C24
-
?emarks
Block
N a
H , L
2gk
& ,
H , L
Black
No.
H , L
(2)The sum check is made for characters marked
'*"
in these diagrams.
(3)In these diagrams, the contents of "character area A", "character area B", and "character
t
depend on the individual system.
For details, see the relevant sections.
The content:
character areas are the same for all 4 formats.
Black
NO.
H , L
Transmission
sequence
St.
No
H , L
Black
No.
H . L
St.
No
H , L
PC
NO.
H , L
St.
NO
H , L
gzk
de
H ,
L
C a m
mand
H
L
St.
N o
H, L
PC
No
H, L
PC
No
H , L
PC
No
H , L
vianbme
Com-
mand
H ,
L
M m C h a r a c f a
areac
M
m
vi2ifbme
Charact-
aredB
, A m k
cade
H ,
L
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