SMC Networks HECR Series Communications Manual

MODBUS communication function
HECR 5-4
5.4 Communication sequence
Starts with a request message from the customer’s system (host), and finishes with a response
message from the product (slave). This product operates as a slave. It does not send any requests.
●Positive response
Based on the request message, reads register/writes register
and returns a positive response.
●Negative response
Returns a negative message when the received request
message is not normal. Refer to ‘’5.9 Negative response’’.
●No response
No response is returned when there is an error in “slave
address specification” or ”LRC”.
Customer's system
(host)
This product
(slave)
Request message
Positive response
Request message
Negative response
Request message
No response
10～200ms
（
Response message
）
（
Response message
）

SMC Networks HECR Series Specifications

General

Brand	SMC Networks
Model	HECR Series
Category	Chiller
Language	English