TOHO ELECTRONICS TTX-700 - Manual (Page 9)

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 reading communications" and
"4.2. Examples of writing communications."
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
９