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WRU90001 is a wireless, battery powered HMI unit. The device features temperature, humidity and CO2 sensors, the values of which can be displayed to user on a large LCD display. It features a native modbus map that grants seamless integration into the DDC/SCADA system. The communication is based on the encrypted Midam KFP protocol, which allows to update the device firmware on a wireless basis.



  • HVAC control
  • measurement of temperature, humidity and CO2
  • display of status values
  • wireless integration into SCADA control systems


The wireless room unit measures temperature and relative humidity. It allows to set the desired temperature setpoint and operating modes using the rotating knob. The values are transmitted through the 868 MHz unlicensed band to the WCOM51 gateway. There is also an option without rotationg know and display available. The room unit features a native modbus map with the direct read and write functionality. The modbus map is available in a separate document. All settings and configuration are also stored in a modbus register, directly in the device. It is necessary to pair the device before first use and to enter the encryption password.

Modbus protocol for WRU90001 for downloading HERE.


SCADA system integration


The controller can be integrated into DDC or SCADA systems directly via the WCOM51 wireless gateway.



To pair your own sensors with the WCOM51 GSM gateway, the freely downloadable KFP-Lite software is available, which communicates with the gateway using the WUSB01 wireless USB configurator. Both devices must be powered and placed in close proximity to each other. Using the search function in the software interface, you can view a list of all available devices in range and assign or modify parameters based on the wireless identification code for each individual device.

Using KFP-Lite, it is possible to change the communication frequency (default value 868.95 MHz).




Remove the base lid of the controller by gently pressing it on the sides. Remove old batteries from the bracket and place new batteries. Observe the battery type and polarity. Always replace both bateries with fresh ones. Then put both parts together and close the controller again.



Wireless room unit WRU90001  
Power supply 4,5V, 3× main alkaline battery 1,5V, type AA 
Consumption Idle: <10 uA, avg. typical: 90 uA, max.: 25 mA 
Battery life up to 3 years – batteries are not supplied with
the device
Communication868,950 MHz, 100 kbps, WMBUS T1, KFP
868,300 MHz, 32 kbps, WMBUS S1, KFP
868,100 MHz, 100 kbps, KFP
869,525 MHz, 100 kbps, WMBUS C, KFP
868,300 MHz, 38 kbps, KFP 
ProtocolWMBUS (EN 13757-4), KFP (dual stack)  
Encryption AES 128 PCBC, EN 13757-4 
RF power +10 až - 20 dBm, krok 5 dB 
Antenna Integrated 
Communication range 100 m in free space, 30 m in buildings 
Mechanical and dimensions 90×115×30 mm enclosure ABS, IP 20 in
accordance with EN 60529, as amended
2 × DIP switch (INIT mode, USR mode)
Temperature measurement range -20 to 55 °C, ± 0,5 °C 
Humidity measuring range 10 až 90 % rH, ±3% rH
CO2 measuring range 400 to 5000 ppm (secondary output 0-100%)
CO2 measuring method NDIR (Non-dispersive Infra Red)
CO2 measuring accuracy ± 30ppm, ± 3% of measured value (defined
conditions for at least 3 calibration ACDL
completed over the past 3 weeks). ACDL (automatic
calibration in dimming light mode).
Temperature setpoint configurable, ± 10 to ± 1 K
Displayreflexive segmented LCD 60×60 mm
Ambient conditions-5 to 45 °C, 5 % to 95 % rH (EN 60721-3-3 class 3K5)

Note: Manufacturer reserves the right to make changes in design and technical characteristics of the products. For actual information, please always contact your dealer.

WRU90001 - Wireless room unit for measuring temperature, humidity and CO2 sensor

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