
23
7.9.8 Setting and reading data collectively
1) Composition of a read request message
a) All channels
S
T
X
□
A
R
□
□
□
E
T
X
B
C
C
①
②
③
④
―⑤― ⑦
⑧
Start code
Unit number
Channel
Identifier
End code
BCC data
2) Composition of a write request message
a) All channels
S
T
X
□
A
W
□
□
□
□
□
□
□
□
E
T
X
B
C
C
①
②
③
④
―⑤― ―――⑥――― ⑦
⑧
Start code
Unit number
Channel
Identifier
Numerical data
End code
BCC data
3) Composition of a store request message
a) All channels
S
T
X
□
A
W
S
T
R
E
T
X
B
C
C
①
②
③
④
―⑤― ⑦
⑧
Start code
Unit number
Channel
Identifier
End code
BCC data
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