Wireless M-Bus IoT converter

WM-Bus technology allows data to be read wirelessly from up to 128 sensors simultaneously using a single device with the Wireless M-Bus protocol EN 137 57-3.

Long battery life of up to 10 years makes the IoT converter an ideal tool for remote energy readings in apartment buildings.

  • Communication on the LoRa network via LoRaWAN 1.0.1 or NB-IoT
  • Wireless M-Bus T1,C1,S1 mode with automatic switching between the modes
  • Readings of 128 WM-Bus devices
  • External antenna with SMA connector for the possibility of outputting the antenna or using the antenna with higher gain
  • Powered by D-cell battery or external 220V AC power supply
  • Battery life up to 10 years, depending on the frequency of communication
  • Integrated LUA scripting interface for modifying device logic without changing the firmware
  • Length: 145 mm
  • Wide: 90 mm
  • Height: 55 mm
  • IP coverage: IP65
  • Operating temperature: -30 °C to +60 °C
  • Montage: wall or pole
  • ACR-CV-101N-W-D2: Wireless M-Bus IoT converter to NB-IoT with 2 x D battery
  • ACR-CV-101L-W-D2: Wireless M-Bus IoT converter to LoRa with D battery
  • ACR-CV-101N-W-D: Wireless M-Bus IoT converter to NB-IoT with D battery
  • ACR-CV-101L-W-D: Wireless M-Bus IoT converter to LoRa with D battery
  • ACR-CV-101L-W-EAC: Externally powered WM-Bus to LoRa
  • ACR-CV-101N-W-EAC: Externally powered WM-Bus to NB-IoT

  • Configuration converter
  • Configuration converter, optically isolated up to 5kV
  • 1x IoT converter
  • 1x Antenna

Communication on the LoRa network via LoRaWAN 1.0.1 or NB-IoT

The external SMA connector allows you to pull the antenna out in installations where it is not possible to operate radio equipment otherwise - for example in sheet metal cabinets.

We offer battery-powered variants for installations where there is no access to power and externally powered variants for long-term operation without worries.

The device lasts up to 10 years on one battery with a sending period of once a month. Consumption when sending a message is 0.067mAh.

The LUA scripting language allows you to adapt the device to a specific project and very quickly implement additional functions that may be needed.

Tested with the following devices

- B-Meter IWM-TX3
- Maddalena Radio Evo 868
- ZENNER Minomess
- AXIS Industries WFH-M
- Qundis Q Cal 5.5
- ZENNER zelsius

Uncommon long battery life

Although we also offer an economical variant with an AA battery, the most popular converter is the variant with a D-cell battery, which provides a capacity of 17 Ah for the LoRaWAN device and 14 Ah for the NB-IoT version. So you can afford to send messages much more often than you ever need. Together with optimized consumption, we can easily reach a service life of more than 10 years. For extremely demanding applications, we can supply a battery pack with 2xD batteries with a capacity of 34 Ah or externally powered variants with a power supply range of 85 - 305V AC.

Robust design for the most demanding applications

In our designs, we aim for the most robust design that can withstand rough handling. All sensitive components are on the underside of the PCB where there is no risk of damage. SMA connectors are not in the form of a so-called pigtail, but it is a solid piece of metal. We do not buy third-party radio modules, but we design our own solutions. The bushings themselves are sealed with both a rubber seal and a glued thread seal. The printed circuit board is lacquered and on the top side of the board, there are only those components with which the user should interact with. We do everything we can so that our products can be operated in the most demanding applications.

Customization to any application

The converter is used for electricity meter or water meter readings where the output is defined. But more often than not, you need to read a non-standard device or you come across an application that you can't find any product "from the shelf". For these projects, we can prepare a turnkey solution and use a LUA script to modify the device so that it works reliably in a defined application, or make the necessary changes to the hardware itself.

Custom integration service

We also offer customers a custom integration service. It is especially suitable for those who want a complete turnkey solution and do not want to deal with the integration of a specific device/meter. Based on the equipment that needs to be read remotely, we will prepare a solution, including documentation for a specific application.

Case study - apartment building readings

For our customer, we implemented a project of water meter readings and secondary calorimeters in apartment buildings. Due to poor signal throughput and apartment situation, 2 Wireless M-Bus units were used to communicate on the NB-IoT network with periodic data transmission once a week. One of the challenges was how to collect data from water meters communicating in the so-called "C" mode and secondary calorimeters communicating in the so-called "S" mode. By easily modifying the logic of the LUA script, we are able to collect data from both frequencies and then send it via the NB-IoT network to a database that further serves the customer. The device lasts 5 years of operation on one battery in a similar mode.