
20
7.9.5 Composition of a request message (transmitted from a high-level computer to
this product)
n For codes ① to ⑧, see "7.9.9 Code description."
n For specific examples of request messages, see "7.9.11 Examples of communications to be
read" and "7.9.12 Examples of communications to be written."
1) Composition of a read request message
S
T
X
□
□
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
S
T
X
□
□
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
S
T
X
□
□
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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