Rotenso RVF

Use cases

• Monitor air return and evaporation pipe temperatures on a live dashboard for each Rotenso RVF unit.
• Adjust temperature setpoints remotely to respond to tenant comfort complaints without a site visit.
• Create alerts when indoor unit capacity demand exceeds a threshold for more than 15 minutes.
• Track historical temperature and capacity data to identify recurring performance issues across a building.
• Verify unit status after maintenance to confirm the Rotenso RVF is back online and operating correctly.

Installation

1. 1Wire the Modbus RTU connection (A and B terminals) from the Rotenso RVF indoor unit to the RS-485 port on your ModbusCloud gateway (MCG or MLP series).
2. 2Set the baud rate on the gateway to 9600 to match the Rotenso RVF default Modbus RTU settings.
3. 3Assign a unique Modbus slave address on each Rotenso RVF unit if multiple units share the same RS-485 bus.
4. 4Import the Rotenso RVF template from the ModbusCloud template library and assign it to the correct gateway and slave address.
5. 5Verify that read and write registers return expected values by checking live data on the ModbusCloud dashboard, paying attention to function code mapping for overlapping addresses.

Things to watch for

01

Why do some registers return unexpected values or seem to conflict?

Register addresses 0 and 1 are shared between temperature readings and settings but use different data types. They likely reside in separate function code spaces (e.g., input registers vs. holding registers). Ensure your gateway is configured to use the correct function code for each register.

02

What baud rate should I use for the Rotenso RVF?

The default baud rate is 9600. Make sure both the Rotenso RVF unit and the ModbusCloud gateway are set to 9600 baud, 8 data bits, 1 stop bit, and the same parity setting.

03

Can I connect multiple Rotenso RVF units on one RS-485 bus?

Yes, as long as each unit has a unique Modbus slave address. Assign distinct addresses on each indoor unit and create a separate device entry in ModbusCloud for each one, all using the same template.

04

Do I need to enable Modbus communication on the Rotenso RVF unit?

Some Rotenso RVF configurations may require Modbus to be explicitly enabled via the unit's local settings or a wired controller. Consult the Rotenso RVF installation manual to confirm Modbus RTU is active before commissioning.

Registers (8)

8 read / 2 write

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