The WM-Bus modules make smart meters and IoT devices connect easily. They use less power, stay secure, and fit in small spaces.
Quectel Wireless Solutions’ KCMCA6S series of sub-GHz Wireless M-Bus (WM-Bus) modules helps developers quickly add reliable, secure, and low-power connectivity to smart metering and IoT devices. The modules support multiple WM-Bus modes (T, C, S, R, N, F), flexible frequency configurations, and dynamic multi-mode switching, making them ideal for applications in water, electricity, gas, heat, and other IoT scenarios. Their compact design and integrated software stack reduce the need for third-party protocol integration, saving time and cost in product development.
The KCMCA6S series operates across 868MHz, 169MHz, and 433MHz bands and complies with the EN13757-4 standard, ensuring seamless integration into advanced metering infrastructure (AMI) systems. The modules feature a low-power architecture with built-in multi-layer security, supporting long-term, reliable operation in both standard and space-constrained devices.
Available in two variants, the KCMCA6S includes a Surface Acoustic Wave (SAW) filter to reduce interference from cellular communications, which is useful for devices combining WM-Bus with NB-IoT or Cat-1, while the KCMCA6S-N provides the same capabilities without the SAW filter.
Designed for compact installations, the modules come in an LCC form factor measuring 25.4mm × 14.0mm × 2.9mm and operate in temperatures from -40°C to +85°C. Each module integrates an ARM Cortex-M33 processor running up to 78MHz, 32KB of RAM, and 256KB of Flash memory, offering a complete all-in-one solution for reliable sub-GHz wireless connectivity.
“The KCMCA6S series WM-Bus modules are well-suited for smart metering use cases in the well-established European smart metering and AMI systems market and we also foresee a wide range of potential applications across other IoT connectivity scenarios,” commented Delbert Sun, Vice General Manager and Product Head, Quectel Wireless Solutions. “We’re proud to bring these compact modules with multiple interfaces to the market to deliver stable network connections with strong anti-interference and reliable data transmission.”
