TOHO ELECTRONICS TTM-00BT - Manual (Page 27)

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8) Storing data other than a store request message
Store all parameters in the EEPROM in either of the three cases described below, even if no
store request message is received.
If auto-tuning is started and ends normally. (Provided that only PID constants are saved.)
9) Changing the settings (SV or SV2) by communications during auto-tuning
Even if the settings (SV or SV2) used in control for auto-tuning are changed by
communications, the settings (SV or SV2) will not be changed until the auto-tuning ends.
Note also that memory banks cannot be changed either, during auto-tuning.
7.9.11 Examples of communications to be read
Example: Request message: Requests the reading of a PV value set in channel 4 of unit number 10.
(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
A 4 R R V 1
E
T
X B
C
C
① ② ③ ⑨ ―⑤― ⑦ ⑧
Response message (returned from this product)
S
T
X
A 4
A
C
K
P V 1 0 0 7 7 7
E
T
X B
C
C
① ② ③ ⑨ ―⑤― ―――⑥――― ⑦ ⑧
Code Code, data ASCII code, note 2)
① Start code STX 02H
② Unit number A (10) 41H
③ Channel setting 4 34H
④ Request contents R (Read) 52H
⑤ Identifier, note 1) PV1 50H 56H 31H
⑥ Numerical data 00777 30H 30H 37H 37H 37H
⑦ End code ETX 03H
⑧ BCC data request 11H
response 72H
⑨ Acknowledge code ACK 06H
Note 1): See "6. Table of identifiers."
Note 2): For the ASCII codes, see "7.9.13. Table of ASCII codes."