Belimo Air-Water Actuator Modbus RTU

Use cases

• Monitor actuator position and sensor values on a live cloud dashboard for remote HVAC oversight.
• Create an alert when the actuator reports a malfunction or service flag to speed up maintenance response.
• Adjust damper or valve setpoints remotely without an on-site visit, reducing travel time and cost.
• Log actuator position data over time to verify correct modulating behavior and diagnose control issues.
• Configure bus fail position and watchdog timeout remotely to ensure safe actuator behavior on communication loss.
• Track multiple Belimo actuators across sites in a single ModbusCloud project for centralized building management.

Installation

1. 1Wire the Modbus RTU bus (A and B terminals) from your ModbusCloud gateway (MCG or MLP series) to the Belimo actuator, observing correct polarity.
2. 2Set the actuator Modbus address to a unique value on the bus and configure the baud rate to 38400 to match the template.
3. 3Enable bus termination on the last device by writing to register 99, or use a physical termination resistor at the end of the bus.
4. 4Configure the setpoint source register (address 118) so the actuator accepts setpoint commands from the Modbus bus.
5. 5Import the Belimo Air-Water Actuator Modbus RTU template in the ModbusCloud portal and assign it to the correct gateway and slave address.
6. 6Optionally configure the bus watchdog timeout (address 109) and bus fail position (address 108) for safe behavior on communication loss.

Things to watch for

Registers (20)

10 read / 10 write

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