Controlling Belimo Valves
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Belimo valves are one of the most recognised and widely used makes of valve in the HVAC industry.
The libraries on this page provide the tools to control and monitor valves using the MQTT open controls protocol and Node-RED.
Modbus Registers
Summary
Note that the register number is one more than address.
Example Read Command
As an example, to read the Setpoint requires sending a FC3 read command (03) to the device (01 default) calling for register 1 (00 00), requesting a single value (01).
In modbus the following characters would be sent to the valve over RS485:
03 01 00 00 01