TOHO ELECTRONICS TTM-10L - Manual (Page 7)

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