The wM-Bus or Wireless Meter Bus is a European standard (EN 13757-4) that defines communication between usability meters and data loggers, hubs or intelligent meter gates. The M-Bus wireless bus has been developed as a standard to meet the needs of the European network of media meters and remote reading systems and forms the basis of a new advanced measurement infrastructure (AMI). The frequency of M-Bus and sub-GHz wireless connections has been used for several years, but is still evolving to adapt to changing environments and take advantage of technological advances, including the emergence of the Internet of Things.

2.4 GHz band vs unlicensed bands

Intelligent network devices require robust long-range wireless communication. The most common frequencies are around 868 MHz, 434 MHz and 169 MHz, which are unlicensed bands in Europe and offer better radio wave propagation compared to 2.4 GHz. By using one of these unlicensed bands, radio waves can reach difficult areas such as underground meters or the location of buildings with many walls or obstacles. Another advantage of operating in the unlicensed band is that utilities have lower solution costs.

COVID-19 and wireless technologies

In times of COVID-19 pandemic hazards, the use of wireless technologies is often a must, to prevent further spread of the coronavirus. One of obvious choices for Internet of Things and home monitorng is Wireless M-Bus implementation.

TECHBASE has added high performance module for Wireless M-Bus connectivity and multi-hop networking into Moduino series expansion options. The module is configured as an embedded micro system or simple data modem for low power applications in the metering specifically allocated band of 169 MHz or in the ISM band of 868 MHz. The device is can be configured for interoperability in a WMBus network for Industrial IoT applications.

The RF implementation guarantees best-in-class performance in terms of covered area and power consumption. The output power can be increased up to +30 dBm on the 169 MHz band (+27 dBm on optimized version for highest power efficiency) and up to +15 dBm on the 868 MHz band. The extremely reduced power consumption gives access to long lasting battery life requirement (up to 2 μA in sleep mode for wireless M-Bus module with an RTC clock running).

The Moduino devices  can be provided with a W-MBus stack specifically developed by Embit for the platform that allows to integrate the module in the desired system without effort and simplify the interaction in WMBus networks.