Belimo 2-way EPIV V4 Modbus RTU

Use cases

• Monitor absolute volumetric flow and supply temperature on a live cloud dashboard to verify hydronic balancing remotely.
• Adjust Vmin and Vmax flow limits from the cloud when system loads change seasonally.
• Create an alert when glycol concentration drops below the required threshold, indicating a potential leak or dilution.
• Log total volume over time to track water consumption per circuit for energy reporting.
• Override the valve setpoint remotely during commissioning to verify correct actuator response without being on site.
• Switch the setpoint source register between analog and bus mode to hand control to the building automation system or the cloud.

Installation

1. 1Wire the Belimo EPIV V4 actuator to the ModbusCloud gateway (MCG or MLP series) using a shielded twisted pair cable connected to the RS-485 A, B, and GND terminals.
2. 2Set the Modbus RTU baud rate on the EPIV V4 to 38400 and assign a unique slave address using the Belimo Assistant App or the onboard DIP switches.
3. 3Configure the same baud rate (38400), parity, and slave address on the corresponding serial port of the ModbusCloud gateway.
4. 4Import the Belimo EPIV V4 template from the ModbusCloud library and assign it to the gateway port where the valve is connected.
5. 5Set register 118 (setpoint source) to bus mode so that setpoints written from the cloud are accepted by the valve.
6. 6Verify communication by checking that live flow, temperature, and position values appear on the ModbusCloud dashboard.

Things to watch for

01

Why am I reading zero for absolute volumetric flow even though the valve is open?

Absolute volumetric flow at address 9 is a uint32 value spanning two registers. Make sure the template is reading both registers and combining them correctly. Also confirm the byte order matches the Belimo default (big-endian).

02

My cloud setpoint changes have no effect on the valve position. What is wrong?

Register 118 (setpoint source) is likely still set to analog mode. Write the value for bus setpoint to register 118 so the valve accepts commands over Modbus RTU instead of following the local analog input.

03

Which baud rate should I use for the EPIV V4?

The default baud rate is 38400. Ensure the ModbusCloud gateway serial port is configured to the same value. Mismatched baud rates will cause communication timeouts.

04

Does this template work with both BAC and KBAC variants?

Yes. Both variants use the same Modbus register map. The only difference is that KBAC models include an emergency position function on power failure, which does not affect Modbus communication.

Registers (47)

29 read / 18 write

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