HRX-OM-W069
Chapter 3 Serial communication
HRL Series
3.4
MODBUS communication function
3-3
Table 3.3-2
Communication specification of MODBUS communication function
Item
Specification
Standard
Select from EIA RS-485
／
RS-232C
Communication speed
Select from 9600bps
／
19200bps
Data
・
bit length
7bit(ASCII) / 8bit(RTU)
Stop
・
bit length
1bit
Data transfer direction
LSB
Parity
Even parity
Letter code
ASCII character string (ASCII) / Binary data(RTU)
Node
type
Slave (Controller)
Slave address set range
Select from 1 to 32 address
Error check
LRC method (ASCII) / CRC method (RTU)
･
:
Default setting
3.4 MODBUS communication function
MODBUS protocol is a communication protocol developed by Modicon.
It is used to communicate with a PC or PLC.
Register content is read and written by this communication protocol.
This communication has the following features.
・
Controls run/stop.
・
Sets and reads the circulating fluid set temperature.
・
Reads the circulating fluid discharge temperature.
・
Reads the circulating fluid discharge pressure.
・
Reads the circulating fluid flow rate.
・
Reads the circulating fluid electric conductivity(CH2 only).
・
Reads the condition of the product.
・
Reads the alarm generating condition of the product.
・
The operation mode can be switched to "SERIAL" mode.
・
You can reset the alarm.
Refer to “3.13 Register Map” for the register of the product.
