HRX-OM-M091
Chapter 5 Simple communication protocol function
5.9 Negative response
HRS Series
5-22
5.9 Negative
response
If the request is not normal when receiving the request, or the request
cannot be received due to the state of the product, a negative response is
returned. Refer to the exception codes in Table 5.5-1 for exceptions.
Response message <Normal> (Slave to Master)
STX Slave
Address NAK
ETX BCC
[STX]
XX
XX
[NAK]
XX
[ETX]
XX
Communication example
○
Slave Address
：
No 1
○
Writing of the circulating fluid set temperature when the communication
range setting is RO (read only).
Request message
Response message
Code
Contents
Code
Contents
01
Slave Address
01
Slave Address
W
Request message to write
[NAK]
Negative response message
SV1
Circulating fluid set temperature
2
Exception code for setting is prohibited
00258
Write information (15.1
o
C) [39h]
BCC
value
[5Ch] BCC
value
Exception code
Your system
This product
(Request)
［
STX
］
01WSV100258[ETX][5Ch]
(Response)
［
STX
］
01
［
NAK]2[ETX][39h]
Data is sent and
received in ASCII
code.
