Proxon FWT2.0

Use cases

• Monitor actual temperatures across all 19 secondary zones and the main zone on a live cloud dashboard.
• Adjust offset temperatures per secondary zone remotely to fine-tune comfort for individual rooms.
• Set operating modes such as EcoSommer or EcoWinter centrally to optimize seasonal energy consumption.
• Create alerts when the fault status register (Stoerung) signals an error, enabling faster troubleshooting.
• Track total power consumption over time to generate energy reports for building owners.
• Enable or disable cooling and heating element release per zone during commissioning or maintenance.

Installation

1. 1Connect the Modbus RTU gateway (MCG or MLP series) to the Proxon FWT2.0 using a shielded twisted-pair cable on the RS-485 A and B terminals.
2. 2Configure the serial port on the gateway to 19200 baud, odd parity (1), and 8 data bits to match the Proxon FWT2.0 communication settings.
3. 3Set a unique Modbus slave address on the Proxon FWT2.0 and note it for the template configuration.
4. 4Import the Proxon FWT2.0 template from the ModbusCloud template library and assign the correct slave address.
5. 5Verify communication by checking that actual temperature readings and fault status appear on the ModbusCloud dashboard.
6. 6Consult the Proxon manual FWT_T300.pdf if additional registers or zone mappings need adjustment.

Things to watch for

01

Why am I not getting any response from the Proxon FWT2.0 over Modbus RTU?

Verify that the baud rate is set to 19200 and parity is set to odd (1) on both the gateway and the Proxon unit. Also check the RS-485 wiring polarity and ensure the correct slave address is configured.

02

How does the offset temperature relate to the actual target temperature for secondary zones?

Secondary zones (NBE) use a middle temperature of 20 degrees Celsius by default. The offset value (+/- 3) is added to this middle temperature to calculate the effective target temperature. For example, an offset of +2 results in a 22 degree target.

03

Can I set an absolute target temperature for secondary zones instead of using the offset?

No. Secondary control units only accept an offset value relative to the middle temperature. Only the main control unit (HBE) supports writing an absolute target temperature directly.

04

What do the operating mode values Aus, EcoSommer, EcoWinter, and Test mean?

Aus turns the system off. EcoSommer and EcoWinter are energy-saving modes optimized for summer and winter conditions respectively. Test is a diagnostic mode used during commissioning. Refer to the Proxon FWT_T300.pdf manual for detailed descriptions.

Registers (89)

89 read / 44 write

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