SMC Networks HECR Series Communications Manual

MODBUS communication function
5-7 HECR
5.6 Function codes
The table berow function codes to read or write register.
NO
Code
Name
Function
1
03(03H)
Read holding registers
Reading multiple registers
2
06(06H)
Preset single register
Writing registers
*1
3
16(10H)
Preset multiple registers
Writing multiple registers
4
23(17H)
Read/write 4x registers
Reading/writing multiple registers
*1：Broadcast is not supported.
5.7 LRC
LRC checks the content of the message other than [:] of START and [CR][LF] of END. The sending
side calculates and sets. The receiving side calculates based on the received message, and
compares the calculation result with the received LRC. The received message is deleted if the
calculation result and received LRC do not match.
Add up the byte number of the message consisting of 8 consecutive bits. The result except the carry
(overflow) is converted to 2’s complement.
◼ Calculation example
LRC message for calculation
0106000B00FE
Calculation
1) Addition
01H+06H+00H+0BH+00H+FEH=110H
2) Object
110H→10H
3) complement of 2
10H→EFH→F0H
LRC is F0H
Sending message
[:]0106000B00FEF0[CR][LF]

SMC Networks HECR Series Specifications

General

Brand	SMC Networks
Model	HECR Series
Category	Chiller
Language	English