Owner manual

36
Operation Method
RS485 Communication Function
5.2 Write communication example
Example) Request message:
A request for setting "SV to 135" (writing 135) is transmitted to the unit set at address 03.
Reply message from the unit to this request message: Information that the request message has
been received is returned.
・Confirm that the data has been properly written by reading it separately.
S
T
X
03
A
C
K
E
T
X
B
C
C
Code Symbol/Data ASCII code
*2
① Start Code
STX 02H
② Address
03 30H 33H
③ Request (Write)
W 57H
④ Identifier
*1
PV1 53H 56H 31H
⑤ Numeric Data
00135 30H 30H 31H 33H 35H
⑥ End Code
ETX 03H
Request 56H
⑦ BCC data
Reply 04H
⑧ Acknowledgement code
ACK 06H
*1): See "7. List of Identifiers/Commands."
*2): For ASCII codes, see "8. List of ASCII Codes."
S
T
X
0 3 W S V1 0 0 1 35
E
T
X
B
C
C
Write request message
(
transmitted from the host com
p
uter
)
① ② ③ ④ ⑥ ⑦ ⑤
Reply message (returned from the unit)
① ② ⑧ ⑥ ⑦