Thermokon NOVOS 3
Room sensor and operating unit for temperature, humidity, CO2 and VOC with set point and fan stage.
The Thermokon NOVOS 3 is a room sensor and room operating unit that measures temperature and, depending on the version, humidity, CO2 and VOC in offices and classrooms. This Modbus RTU template reads all measured values, occupancy and fan stage and lets you write set points, offsets and display settings from ModbusCloud.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 152, read and write
- Brand
- Thermokon
- Key readings
- Temperature · Relative humidity · CO2 · VOC · Dew point · Room occupancy
- Available commands
- Set point · Room occupancy · Fan stage feedback · LED colour · Display icons
- Compatible models
- NOVOS 3 RS485 Modbus · NOVOS 3 x RS485 Modbus · NOVOS 3 INC x RS485 Modbus
- Last updated
Registers (152)
152 read, 138 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Temperature | °C | Read | |||
| Relative Humidity | %RH | Read | |||
| CO2 | ppm | Read | |||
| VOC | % | Read | |||
| CO2 VOC Mix | % | Read | |||
| Absolute Humidity | g/m³ | Read | |||
| Enthalpy | Read | ||||
| Dew Point | °C | Read | |||
| Digital Input | Read | ||||
| Room Occupancy | Read and write | ||||
| ECO Function | Read and write | ||||
| Set Point Effective | °C | Read and write | |||
| Fan Stage User Set | Read | ||||
| Fan Stage Feedback BMS | Read and write | ||||
| Set Point Display Mode | Read and write | ||||
| Base Set Point | °C | Read and write | |||
| Set Point Adjustment Range | K | Read and write | |||
| Set Point Step Width | K | Read and write | |||
| ECO Button Function | Read and write | ||||
| Occupancy Button Function | Read and write | ||||
| Room Occupancy After Reset | Read and write | ||||
| Fan Stage Display | Read and write | ||||
| Number of Fan Stages | Read and write | ||||
| Fan Stage Auto Available | Read and write | ||||
| Minimum Fan Stage | Read and write | ||||
| Fan Stage After Reset | Read and write | ||||
| LED Illumination Mode | Read and write | ||||
| LED Illumination Colour | Read and write | ||||
| Unit System | Read and write | ||||
| Display Mode | Read and write | ||||
| Offset Temperature | °C | Read and write | |||
| Offset Relative Humidity | %RH | Read and write | |||
| Offset CO2 | ppm | Read and write | |||
| Offset VOC | % | Read and write | |||
| Temperature Lower Limit | °C | Read and write | |||
| Temperature Upper Limit | °C | Read and write | |||
| Display Temperature | Read and write | ||||
| TLF Temperature On | Read and write | ||||
| TLF Temperature Range 1 Colour | Read and write | ||||
| TLF Temperature Range 2 Colour | Read and write | ||||
| TLF Temperature Range 3 Colour | Read and write | ||||
| TLF Temperature Range 4 Colour | Read and write | ||||
| TLF Temperature Range 5 Colour | Read and write | ||||
| TLF Temperature Threshold 1-2 | Read and write | ||||
| TLF Temperature Threshold 2-3 | Read and write | ||||
| TLF Temperature Threshold 3-4 | Read and write | ||||
| TLF Temperature Threshold 4-5 | Read and write | ||||
| Relative Humidity Lower Limit | %RH | Read and write | |||
| Relative Humidity Upper Limit | %RH | Read and write | |||
| Display Relative Humidity | Read and write | ||||
| TLF Relative Humidity On | Read and write | ||||
| TLF Relative Humidity Range 1 Colour | Read and write | ||||
| TLF Relative Humidity Range 2 Colour | Read and write | ||||
| TLF Relative Humidity Range 3 Colour | Read and write | ||||
| TLF Relative Humidity Range 4 Colour | Read and write | ||||
| TLF Relative Humidity Range 5 Colour | Read and write | ||||
| TLF Relative Humidity Threshold 1-2 | Read and write | ||||
| TLF Relative Humidity Threshold 2-3 | Read and write | ||||
| TLF Relative Humidity Threshold 3-4 | Read and write | ||||
| TLF Relative Humidity Threshold 4-5 | Read and write | ||||
| Absolute Humidity Lower Limit | g/m³ | Read and write | |||
| Absolute Humidity Upper Limit | g/m³ | Read and write | |||
| Display Absolute Humidity | Read and write | ||||
| TLF Absolute Humidity On | Read and write | ||||
| TLF Absolute Humidity Range 1 Colour | Read and write | ||||
| TLF Absolute Humidity Range 2 Colour | Read and write | ||||
| TLF Absolute Humidity Range 3 Colour | Read and write | ||||
| TLF Absolute Humidity Range 4 Colour | Read and write | ||||
| TLF Absolute Humidity Range 5 Colour | Read and write | ||||
| TLF Absolute Humidity Threshold 1-2 | Read and write | ||||
| TLF Absolute Humidity Threshold 2-3 | Read and write | ||||
| TLF Absolute Humidity Threshold 3-4 | Read and write | ||||
| TLF Absolute Humidity Threshold 4-5 | Read and write | ||||
| Enthalpy Lower Limit | Read and write | ||||
| Enthalpy Upper Limit | Read and write | ||||
| Display Enthalpy | Read and write | ||||
| TLF Enthalpy On | Read and write | ||||
| TLF Enthalpy Range 1 Colour | Read and write | ||||
| TLF Enthalpy Range 2 Colour | Read and write | ||||
| TLF Enthalpy Range 3 Colour | Read and write | ||||
| TLF Enthalpy Range 4 Colour | Read and write | ||||
| TLF Enthalpy Range 5 Colour | Read and write | ||||
| TLF Enthalpy Threshold 1-2 | Read and write | ||||
| TLF Enthalpy Threshold 2-3 | Read and write | ||||
| TLF Enthalpy Threshold 3-4 | Read and write | ||||
| TLF Enthalpy Threshold 4-5 | Read and write | ||||
| Dew Point Lower Limit | °C | Read and write | |||
| Dew Point Upper Limit | °C | Read and write | |||
| Display Dew Point | Read and write | ||||
| TLF Dew Point On | Read and write | ||||
| TLF Dew Point Range 1 Colour | Read and write | ||||
| TLF Dew Point Range 2 Colour | Read and write | ||||
| TLF Dew Point Range 3 Colour | Read and write | ||||
| TLF Dew Point Range 4 Colour | Read and write | ||||
| TLF Dew Point Range 5 Colour | Read and write | ||||
| TLF Dew Point Threshold 1-2 | Read and write | ||||
| TLF Dew Point Threshold 2-3 | Read and write | ||||
| TLF Dew Point Threshold 3-4 | Read and write | ||||
| TLF Dew Point Threshold 4-5 | Read and write | ||||
| CO2 Lower Limit | ppm | Read and write | |||
| CO2 Upper Limit | ppm | Read and write | |||
| Display CO2 | Read and write | ||||
| TLF CO2 On | Read and write | ||||
| TLF CO2 Range 1 Colour | Read and write | ||||
| TLF CO2 Range 2 Colour | Read and write | ||||
| TLF CO2 Range 3 Colour | Read and write | ||||
| TLF CO2 Range 4 Colour | Read and write | ||||
| TLF CO2 Range 5 Colour | Read and write | ||||
| TLF CO2 Threshold 1-2 | Read and write | ||||
| TLF CO2 Threshold 2-3 | Read and write | ||||
| TLF CO2 Threshold 3-4 | Read and write | ||||
| TLF CO2 Threshold 4-5 | Read and write | ||||
| VOC Lower Limit | % | Read and write | |||
| VOC Upper Limit | % | Read and write | |||
| Display VOC | Read and write | ||||
| TLF VOC On | Read and write | ||||
| TLF VOC Range 1 Colour | Read and write | ||||
| TLF VOC Range 2 Colour | Read and write | ||||
| TLF VOC Range 3 Colour | Read and write | ||||
| TLF VOC Range 4 Colour | Read and write | ||||
| TLF VOC Range 5 Colour | Read and write | ||||
| TLF VOC Threshold 1-2 | Read and write | ||||
| TLF VOC Threshold 2-3 | Read and write | ||||
| TLF VOC Threshold 3-4 | Read and write | ||||
| TLF VOC Threshold 4-5 | Read and write | ||||
| CO2 VOC Mix Lower Limit | % | Read and write | |||
| CO2 VOC Mix Upper Limit | % | Read and write | |||
| Display CO2 VOC Mix | Read and write | ||||
| TLF CO2 VOC Mix On | Read and write | ||||
| TLF CO2 VOC Mix Range 1 Colour | Read and write | ||||
| TLF CO2 VOC Mix Range 2 Colour | Read and write | ||||
| TLF CO2 VOC Mix Range 3 Colour | Read and write | ||||
| TLF CO2 VOC Mix Range 4 Colour | Read and write | ||||
| TLF CO2 VOC Mix Range 5 Colour | Read and write | ||||
| TLF CO2 VOC Mix Threshold 1-2 | Read and write | ||||
| TLF CO2 VOC Mix Threshold 2-3 | Read and write | ||||
| TLF CO2 VOC Mix Threshold 3-4 | Read and write | ||||
| TLF CO2 VOC Mix Threshold 4-5 | Read and write | ||||
| Sensor Setup | Read | ||||
| Hardware Version | Read | ||||
| Firmware Version Main Sub | Read | ||||
| Firmware Version Revision Build | Read | ||||
| Icon Dew Point | Read and write | ||||
| Icon Window Open | Read and write | ||||
| Icon Calibration Due | Read and write | ||||
| Icon Communication Error Bus | Read and write | ||||
| Icon ECO | Read and write | ||||
| Icon Mode Heating | Read and write | ||||
| Icon Mode Cooling | Read and write | ||||
| Icon Presence Detection | Read and write | ||||
| Icon Warning | Read and write | ||||
| Icon Maintenance Due | Read and write |
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Use cases
- Show temperature, humidity and CO2 per room on a ModbusCloud dashboard.
- Get an email alert when CO2 in a meeting room stays above a threshold you set.
- Keep a year of room climate history to check comfort and ventilation per season.
- Adjust the base set point of a room from ModbusCloud without going on site.
- Switch the warning or maintenance icon on the display from an automation.
Installation
Connect A and B of the RS485 bus to the ModbusCloud Gateway with twisted pair cable and terminate both ends with 120 ohm.
Set a unique address, the baud rate and parity with the DIP switches on the NOVOS 3.
In ModbusCloud, add a Modbus device on the Gateway with that address and serial settings and import this template.
Check that temperature and, if present, humidity and CO2 read plausible values.
Things to watch for
The unit does not answer. What should I check?
Check address, baud rate and parity on the DIP switches against ModbusCloud. Without parity the unit can use 1 or 2 stop bits, so match that too. Then check A and B and the 120 ohm termination at both bus ends.
Why do some registers read zero or nonsense?
Not every NOVOS 3 version has every sensor. A temperature-only unit has no humidity, CO2 or VOC. Read Sensor Setup to see which sensors are present and hide the registers you do not need.
Temperature reads in Fahrenheit. Why?
Register Unit System is set to 2, imperial. Set it to 1 for SI. Measuring limits are not converted when you switch, so check them afterwards.
Can I write the settings as often as I like?
No. Set points, offsets, limits and display settings are stored in EEPROM and must not be written in short cycles. Write them once when you configure the unit. The LED registers are not stored and must be written again after a restart.
Want to see how it works?
