Beckhoff Knowledge Base: Communication with the WRF08 RS485 MODBUS room control unit by Thermokon

Connecting the WRF08 RS485 MODBUS room control unit to a KL6041

The room control unit has four connections. Data is output on terminals 1 (Net A) and 2 (Net B). The terminals 3 (24 V DC) and 4 (GND) are intended for the power supply.

 

It is essential to follow the manufacturer’s installation instructions. www.thermokon.de

 

Connect the room control unit to the KL6041 terminal as follows:

 

On the KL6041, pins 1 and 2 (Data +) and pins 5 and 6 (Data -) must be connected to each other.

Connecting the WRF08 RS 485 MODBUS room control unit to a KL6041 1:

 

 

 

Connecting the WRF08 RS 485 MODBUS room control unit to a KL6041 2:

Terminal settings

Set the KL6041 Terminal with the KS2000 Software to the following values:

General Settings:

Connecting the WRF08 RS 485 MODBUS room control unit to a KL6041 3:

 

RS485 interface parameters:

Connecting the WRF08 RS 485 MODBUS room control unit to a KL6041 4: