
8
3.3 Composition of a request message (transmitted from a high-level
computer to this product)
For codes ① to ⑩, see "3.5 Description of codes."
For specific examples of request messages, see "4.1 Examples of communications to be read"
and "4.2 Examples of communications to be written."
3.3.1 Composition of a read request message
S
T
X
□ □
R
B
C
C
□ □ □
E
T
X
①
Start code
②
Address
③
Contents of the
|④
Identifier
| ⑥
End code
⑦
BCC data
request: read/write
3.3.2 Composition of a write request message
S
T
X
□ □
W
B
C
C
□ □ □
E
T
X
①
Start code
②
Address
③
Contents of the
|④
Identifier
|
⑥
End code
⑦
BCC data
□ □ □ □ □
||⑤
Numerical data
||
request: read/write
3.3.3 Composition of a store request message
S
T
X
□ □
W
B
C
C
S T R
E
T
X
①
Start code
②
Address
③
Contents of the
|④
Identifier
| ⑥
End code
⑦
BCC data
request: read/write
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