HD67931-B2-868MHz-250 Industrial M-Bus Wireless to MQTT Gateway for 250 devices

HD67931-B2-868MHz-250 – Industrial M-Bus Wireless to MQTT converter, master M-Bus up to 250 wired slaves and up to 32 wireless M-Bus slaves, housing type B (wide), DIN rail mount.

The HD67931-B2-868MHz-250 gateway is designed for seamless integration of M-Bus wired and wireless devices into IoT platforms using the MQTT protocol. Supporting up to 250 wired M-Bus meters and up to 32 wireless meters operating in the 868 MHz frequency band, it enables large-scale deployment in energy monitoring, smart metering, and industrial automation. This flexibility makes the device suitable for district heating systems, water consumption monitoring, and smart city infrastructure. With native support for TLS/SSL encryption, the device ensures secure and reliable data transmission over Ethernet, protecting sensitive measurement information from unauthorized access.

The gateway is compatible with M-Bus meters from renowned manufacturers such as SIEMENS, Kamstrup, Maddalena, and Sontex. Data collected from meters is published in real time to an MQTT server, allowing easy integration with BMS, SCADA, and cloud-based monitoring systems. Thanks to the free SW67931 configuration software, users can quickly define MQTT parameters, M-Bus wired line settings, and M-Bus Wireless configurations. The tool also allows to select which M-Bus variables will be sent to the MQTT server, simplifying project customization and ensuring compatibility with diverse IoT ecosystems.

Built for industrial environments, the HD67931-B2-868MHz-250 features robust performance with an operating temperature range of -40°C to +85°C. It offers compact dimensions of 71 x 60 x 95 mm and a weight of approximately 200 g, making it ideal for DIN rail installation inside control cabinets. The unit operates with a wide power supply range of 18…35 V DC, while start-up peak consumption remains limited to 30 W. High-performance communication is guaranteed through an Ethernet port 10/100 Base-T autosensing and M-Bus speeds up to 38400 bit/s. In addition, the device provides electrical isolation between Ethernet and M-Bus, increasing system safety and reducing potential interference. The manufacturer provides a 24-month warranty, emphasizing the reliability of this gateway in professional applications.

HD67931-B2-868MHz-250 allows to publish the data read from MBus meters into a MQTT Server. These gateways allow a fast and easy access to the IoT world and they are compatible with IoT Servers that support MQTT protocol. The MQTT communication can be encrypted using TLS / SSL protocols, ensuring a secure communication.

They allow to monitor MBus meters (like SIEMENS, Kamstrup, Maddalena, Sontex, etc.). Converter is easy to configure thanks to free SW67931 software.

Configuration:

Thanks to the SW67931 software on your PC you can:

• Define the parameters of MQTT line
• Define the parameters of MBus line
• Define the parameters of MBus Wireless line
• Define which MBus variables are sent to MQTT Server
• Update the device

Characteristics:

• Electrical isolation between Ethernet and MBus
• Mountable on 35mm Rail DIN
• Wide power supply input range: 18...35V DC

Specifications:

• Ports: 1x Ethernet, 1x MBus Wireless; 1x MBus
• Ethernet protocol: MQTT
• MBus Wireless protocol: MBus Wireless, S1&T1 communication
• MBus protocol: MBus Master
• MQTT connector: RJ45
• MBus Wireless connector: SMA Female Antenna
• MBus connector: 2way 5mm terminal block
• MBus Wireless frequency: 868 MHz
• Data Rates MQTT: 10/100 Base-T with autosensing
• Data Rates MBus: Up to 38400 bit/s
• Power supply: 18...35V DC
• Maximum power consumption at converter start-up: 30W
• Power supply connector: 2way 5mm terminal block
• Operating temperature: -40°C/+85°C (-40°F/+185°F)
• Dimensions: 71 mm x 60 mm x 95 mm (DxWxH)
• Weight: 200g approx
• Mechanical fixing: DIN Rail mount
• Software: SW67931
• ORDER CODE: HD67931-B2-868MHz-250

Configurator – Software SW67931 FREE DOWNLOAD

Manufacturer's warranty: 24 months

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