TOHO ELECTRONICS TTX-700 - Manual (Page 10)

3.4 Composition of a response message (transmitted from this product to a
high-level computer)
n For codes ① through 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."
3.4.1 Response message in response to a read request message
Ｓ
Ｔ
Ｘ
□ □
Ａ
Ｃ
Ｋ
Ｂ
Ｃ
Ｃ
□ □ □
Ｅ
Ｔ
Ｘ
①
Start code
②
Address
⑧
Acknowledge code
｜ ④
Identifier
｜ ⑥
End code
⑦
BCC data
□ □ □ □ □
｜ ｜ ⑤
Numerical data
｜ ｜
3.4.2 Response message in response to a write/store request message
Ｓ
Ｔ
Ｘ
□ □
Ａ
Ｃ
Ｋ
Ｂ
Ｃ
Ｃ
Ｅ
Ｔ
Ｘ
①
Start code
②
Address
⑥
End code
⑦
BCC data
⑧
Acknowledge code
3.4.3 Response message in the case of an error
Ｓ
Ｔ
Ｘ
□ □
Ｎ
Ａ
Ｋ
Ｂ
Ｃ
Ｃ
Ｅ
Ｔ
Ｘ
①
Start code
②
Address
⑥
End code
⑦
BCC data
⑨
Negative
□
⑩
Error code acknowledge code
１０