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WM-Bus Range Extender LoRaWAN Certified

Following on the success of the LoRa® product portfolio, IMST GmbH presents the new LoRaWAN® certified WM-Bus Range Extender to collect Wireless M-Bus messages from utility meters and foward them to a LoRaWAN® network.

“The LoRa® modulation is a perfect mean to increase the range of wireless communication systems. The new WM-Bus Range Extender combines two modulation technics and communication protocol stacks in one single device.” says Heinz Syrzisko, head of the Wireless Solutions department. “The integrated memory and the ultra-low power mode provided by the new iM881A-XL radio module ensure a long battery life of up to 10 years and more.”

This product allows filtering Wireless M-Bus messages by Manufacturer ID (M-field) and Sender Address (A-field) to select specific groups of meters. The intelligent calender enables a flexible configuration of events and repetition interval (minutes, hours, days, weeks…). Even large WM-Bus messages can be forwarded with LoRaWAN® radio packets by means of an integrated segmentation and reassembly protocol.

WM-Bus Range Extender LoRaWAN Certified

Key Features

  • WM-Bus S and combined C/T Mode supported
  • WM-Bus telegram format: A and B
  • LoRaWAN® Activation: ABP and OTAA
  • EU868 LoRaWAN® compliant
  • Flexible configuration of calendar events and device whitelist
  • Confirmed upload of WM-Bus messages
  • Ultra low power for long battery life


  • Automated Meter Reading
  • Home and Building Automation
  • Industrial Monitoring and Control
  • IoT (Internet of Things)
  • Smart Cities

RF Performance Test

LoRaWAN RF Tested Certificate - IMST - Wireless M-Bus Range Extender_070220-1

LoRaWAN® Certificate

LoRaWAN Certified Product Certificate - Wireless M-Bus Range Extender_070220-1