Nilan VP18

Use cases

• Monitor intake, condenser, and room temperatures on a live dashboard to verify heat recovery performance.
• Adjust ventilation speed and mode remotely when occupancy patterns change at a customer site.
• Create an alert when an alarm ID is active so you can respond to faults before the end user notices.
• Log hot water temperature setpoints and actual values over time to optimize energy consumption.
• Track compressor run status and fan speeds to identify maintenance needs before components fail.

Installation

1. 1Wire the Modbus RTU bus (A and B terminals) from the Nilan CTS 602 controller to the RS-485 port on your ModbusCloud gateway (MCG or MLP series).
2. 2Set the Modbus slave address on the CTS 602 controller and ensure it does not conflict with other devices on the bus.
3. 3Configure the gateway serial port to 19200 baud, 8 data bits, odd parity (1), and 1 stop bit to match the CTS 602 settings.
4. 4Import the Nilan VP18 template from the ModbusCloud template library into your project.
5. 5Verify communication by checking that live temperature and fan speed readings appear on the ModbusCloud dashboard.
6. 6Test a writable parameter such as the ventilation speed setpoint to confirm bidirectional communication is working.

Things to watch for

01

Why do I get incorrect temperature readings from the VP18?

Temperature values on the CTS 602 are stored as int16 integers and often require a scale factor (for example, dividing by 10 or 100). Check the Nilan Modbus specification for the correct scaling per register.

02

Why do some registers return wrong data or no data at all?

The CTS 602 uses overlapping register addresses for input and output registers. You must use the correct Modbus function code for each register. For example, reading an input register with a holding register function code will return incorrect values.

03

What baud rate and parity settings should I use?

The Nilan VP18 with CTS 602 requires 19200 baud and odd parity. Make sure both the gateway and the CTS 602 are set identically, otherwise communication will fail.

04

Can I use this template with other Nilan models that have a CTS 602 controller?

This template is configured specifically for the Nilan VP18. Other Nilan models with CTS 602 may share many registers, but differences can exist. Verify against the Modbus specification for your specific model before using it.

Registers (32)

31 read / 8 write

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