Toho-electronics TTM-00BT Manuale Utente Pagina 20

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20
7.9.5 Composition of a request message (transmitted from a high-level computer to
this product)
n For codes to , 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
―⑤―
Start code
Unit number
Channel
Contents of the
request: read
Identifier
End code
BCC data
2) Composition of a write request message
S
T
X
W
E
T
X
B
C
C
―⑤― ―――⑥―――
Start code
Unit number
Channel
Contents of the
request: write
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
―⑤―
Start code
Unit number
Channel
Contents of the
request: write
Identifier
End code
BCC data
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