Examples of toho communications, Examples of communications to be read – TOHO ELECTRONICS TTM200 User Manual
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4. Examples of TOHO 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)
S
T
X
2 7 R
B
C
C
P V 1
E
T
X
① ② ③
|
④
|
⑥ ⑦
S
T
X
2 7
A
C
K
B
C
C
P V 1
E
T
X
① ② ⑧
|
④
|
⑥ ⑦
0 0 7 7 7
|
|
⑤
|
|
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 "10. Table of identifiers (codes)."
Note 2): For the ASCII codes, see "11. Table of ASCII codes."