The Wireless M-Bus Range Extender is a compact and cost-effective device that collects wireless M-Bus messages from utility meters and forwards them to a LoRaWAN® network.
This product extends significantly the range of systems and allows filtering those messages by Manufacturer ID (M-field) and Sender Address (A-field) to select specific groups of measuring instruments.

This device acts as a bridge between wireless M-Bus and LoRa® and allows a flexible configuration of calendar events for WM-Bus reception intervals and status messages as well as device filtering by Manufacturer ID and Device ID (whitelist). The configuration can be managed Over-The-Air via LoRa® messages or via wired serial interface.

Beside the Wireless M-Bus functionality the firmware supports a LoRaWAN® compliant protocol stack as well as a proprietary LoRa® stack for wireless Point-to-Point and Point-to-Multipoint communication.

Key Features

  • WM-Bus S and combined C/T Mode supported
  • WM-Bus telegram format: A and B
  • LoRaWAN® Activation: ABP and OTA
  • EU868 LoRaWAN® Compliant (v.1.0.2)
  • 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

The Wireless M-Bus standard (EN 13757-4) is used in many wireless sensor and smart meter applications. These meters and sensors are communicating according to defined radio operation modes based on a standard FSK modulation with more or less range to the corresponding receiving unit.

The LoRa® modulation is a perfect mean to increase the range of wireless communication systems. The Wireless M-Bus Range Extender combines the two existing modulation technics and required communication protocol stacks in one single device.

A typical usecase for this product is the forwarding of WM-Bus messages of a configurable group of sensor / meter devices. This bridge offers a flexible way to define hourly, daily, weekly or monthly reception windows for sampling of WM-Bus messages and a large data memory for temporary buffering. Even large WM-Bus messages with maximum payload size can be forwarded with small LoRaWAN® radio packets by means of an integrated segmentation and reassembly protocol.

Besides LoRaWAN® a proprietary Point-to-Point and Point-to-Multipoint protocol (LR Base) can be selected for local configuration and message forwarding.*

* on request
Frequency rangeSRD Band 863 to 870 MHz
ModulationLoRa® Spread-Spectrum / FSK / Wireless M-Bus standard (EN 13757-4)
WM-Bus ModesWM-Bus S and combined C/T Mode supported
Max.Output Power+14 dBm
Data Memory8 MBit Flash
Dimensions145 x 92 x 55 mm
Operating temperature-10 °C to +55 °C
AntennaIntegrated antenna or external antenna (on request)
HousingIP65 Housing for wall mounting

We look forward to working with you!