Proxon FWT2.0
Monitors and controls Proxon FWT2.0 ventilation heating system zones via Modbus RTU
Modbus RTU template for the Zimmermann Proxon FWT2.0 ventilation heating system. It reads actual, offset, and middle temperatures, total power, and fault status across up to 19 secondary zones plus the main zone. It also writes target temperatures, offset temperatures, operating modes, and cooling or heating element release per zone.
- Protocol
- Modbus RTU
- Connection
- RS485, 19200 baud
- Registers
- 89, read and write
- Brand
- Zimmermann
- Key readings
- Actual temperature per zone (NBE 1-19, HBE, HNBE) · Offset temperature per zone · Middle temperature per zone · Target temperature HBE · Power Total · Fault status (Stoerung)
- Available commands
- Target temperature HBE · Offset temperature per zone · Operating mode (Aus/EcoSommer/EcoWinter/Test) · Cooling and heating element release per zone
- Compatible models
- Proxon FWT2.0
- Last updated
Registers (89)
89 read, 44 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Ist-Temperatur NBE 1 | °C | Read | |||
| Ist-Temperatur HNBE | °C | Read | |||
| Ist-Temperatur HBE | °C | Read | |||
| Ist-Temperatur NBE 2 | °C | Read | |||
| Ist-Temperatur NBE 3 | °C | Read | |||
| Ist-Temperatur NBE 4 | °C | Read | |||
| Ist-Temperatur NBE 5 | °C | Read | |||
| Ist-Temperatur NBE 6 | °C | Read | |||
| Ist-Temperatur NBE 7 | °C | Read | |||
| Ist-Temperatur NBE 8 | °C | Read | |||
| Ist-Temperatur NBE 9 | °C | Read | |||
| Ist-Temperatur NBE 10 | °C | Read | |||
| Ist-Temperatur NBE 11 | °C | Read | |||
| Ist-Temperatur NBE 12 | °C | Read | |||
| Ist-Temperatur NBE 13 | °C | Read | |||
| Ist-Temperatur NBE 14 | °C | Read | |||
| Ist-Temperatur NBE 15 | °C | Read | |||
| Ist-Temperatur NBE 16 | °C | Read | |||
| Ist-Temperatur NBE 17 | °C | Read | |||
| Ist-Temperatur NBE 18 | °C | Read | |||
| Ist-Temperatur NBE 19 | °C | Read | |||
| Power Total | kW | Read | |||
| Stoerung | Read | ||||
| Solltemperatur HBE | °C | Read and write | |||
| Offsettemperatur NBE 1 | °C | Read and write | |||
| Offsettemperatur NBE 2 | °C | Read and write | |||
| Offsettemperatur NBE 3 | °C | Read and write | |||
| Offsettemperatur NBE 4 | °C | Read and write | |||
| Offsettemperatur NBE 5 | °C | Read and write | |||
| Offsettemperatur NBE 6 | °C | Read and write | |||
| Offsettemperatur NBE 7 | °C | Read and write | |||
| Offsettemperatur NBE 8 | °C | Read and write | |||
| Offsettemperatur NBE 9 | °C | Read and write | |||
| Offsettemperatur NBE 10 | °C | Read and write | |||
| Offsettemperatur NBE 11 | °C | Read and write | |||
| Offsettemperatur NBE 12 | °C | Read and write | |||
| Offsettemperatur NBE 13 | °C | Read and write | |||
| Offsettemperatur NBE 14 | °C | Read and write | |||
| Offsettemperatur NBE 15 | °C | Read and write | |||
| Offsettemperatur NBE 16 | °C | Read and write | |||
| Offsettemperatur NBE 17 | °C | Read and write | |||
| Offsettemperatur NBE 18 | °C | Read and write | |||
| Offsettemperatur NBE 19 | °C | Read and write | |||
| Offsettemperatur HNBE | °C | Read and write | |||
| Mitteltemperatur NBE 1 | °C | Read | |||
| Mitteltemperatur NBE 2 | °C | Read | |||
| Mitteltemperatur NBE 3 | °C | Read | |||
| Mitteltemperatur NBE 4 | °C | Read | |||
| Mitteltemperatur NBE 5 | °C | Read | |||
| Mitteltemperatur NBE 6 | °C | Read | |||
| Mitteltemperatur NBE 7 | °C | Read | |||
| Mitteltemperatur NBE 8 | °C | Read | |||
| Mitteltemperatur NBE 9 | °C | Read | |||
| Mitteltemperatur NBE 10 | °C | Read | |||
| Mitteltemperatur NBE 11 | °C | Read | |||
| Mitteltemperatur NBE 12 | °C | Read | |||
| Mitteltemperatur NBE 13 | °C | Read | |||
| Mitteltemperatur NBE 14 | °C | Read | |||
| Mitteltemperatur NBE 15 | °C | Read | |||
| Mitteltemperatur NBE 16 | °C | Read | |||
| Mitteltemperatur NBE 17 | °C | Read | |||
| Mitteltemperatur NBE 18 | °C | Read | |||
| Mitteltemperatur NBE 19 | °C | Read | |||
| Mitteltemperatur HNBE | °C | Read | |||
| Betriebsart (0=Aus, 1=EcoSommer, 2=EcoWinter, 9=Test) | Read and write | ||||
| Freigabe Kühlung | Read and write | ||||
| Wärmeelement Freigabe NBE 2 | Read and write | ||||
| Gerätetyp | Read | ||||
| Wärmeelement Freigabe NBE 1 | Read and write | ||||
| Wärmeelement Freigabe HNBE | Read and write | ||||
| Wärmeelement Freigabe NBE 3 | Read and write | ||||
| Wärmeelement Freigabe NBE 4 | Read and write | ||||
| Wärmeelement Freigabe NBE 5 | Read and write | ||||
| Wärmeelement Freigabe NBE 6 | Read and write | ||||
| Wärmeelement Freigabe NBE 7 | Read and write | ||||
| Wärmeelement Freigabe NBE 8 | Read and write | ||||
| Wärmeelement Freigabe NBE 9 | Read and write | ||||
| Wärmeelement Freigabe NBE 10 | Read and write | ||||
| Wärmeelement Freigabe NBE 11 | Read and write | ||||
| Wärmeelement Freigabe NBE 12 | Read and write | ||||
| Wärmeelement Freigabe NBE 13 | Read and write | ||||
| Wärmeelement Freigabe NBE 14 | Read and write | ||||
| Wärmeelement Freigabe NBE 15 | Read and write | ||||
| Wärmeelement Freigabe NBE 16 | Read and write | ||||
| Wärmeelement Freigabe NBE 17 | Read and write | ||||
| Wärmeelement Freigabe NBE 18 | Read and write | ||||
| Wärmeelement Freigabe NBE 19 | Read and write | ||||
| Wärmeelement Freigabe HBE | Read and write | ||||
| T3 Frischlusft | °C | Read |
Loading registers…
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If a device is not in the library yet, we build the template for free as soon as we have the register data.
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
Connect the ModbusCloud Gateway to the Proxon FWT2.0 using a shielded twisted-pair cable on the RS-485 A and B terminals.
Configure the serial port on the gateway to 19200 baud, odd parity (1), and 8 data bits to match the Proxon FWT2.0 communication settings.
Set a unique Modbus slave address on the Proxon FWT2.0 and note it for the template configuration.
Import the Proxon FWT2.0 template from the ModbusCloud template library and assign the correct slave address.
Verify communication by checking that actual temperature readings and fault status appear on the ModbusCloud dashboard.
Consult the Proxon manual FWT_T300.pdf if additional registers or zone mappings need adjustment.
Things to watch for
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.
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.
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.
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.
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