TOHO ELECTRONICS TTM-10L - Manual (Page 13)

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4. Examples of communications
4.1 Examples of communications to be read
Example: Request message: This requests this product set at address 27 to read the PV.
(High-level computer)
In response to that,
Response message: This returns PV data (00777).
(This product)
Read request message (transmitted from the high-level computer)
Ｐ １
Ｐ １ ２
Ｓ
Ｔ
Ｘ
７
Ｂ
Ｃ
Ｃ
Ｖ
Ｅ
Ｔ
Ｘ
① ③ ⑥ ⑦
２
Ｂ
Ｃ
Ｃ
Ｅ
Ｔ
Ｘ
① ② ⑧ ⑥ ⑦
０ ０ ７ ７ ７
Ｒ
Ｓ
Ｔ
Ｘ
７
Ａ
Ｃ
Ｋ
Ｖ
④
⑤
②
④
Code Code, data ASCII code, note 2)
① Start code STX 02H
② Address 27 32H 37H
③ Request contents R (Read) 52H
④ Identifier, note 1) PV1 50H 56H 31H
⑤ Numerical data 00777 30H 30H 37H 37H 37H
⑥ End code ETX 03H
⑦ BCC data request 61H
response 02H
⑧ Acknowledge code ACK 06H
Note 1): See "7. Table of identifiers (codes)."
Note 2): For the ASCII codes, see "8. Table of ASCII codes."
Response message (returned from this product)