HD67931-B2-250 Industrial M-Bus to MQTT Converter for up to 250 devices

HD67931-B2-250 – Industrial M-Bus to MQTT Converter, M-Bus master up to 250 slaves, housing type B (wide), DIN rail mount.

The HD67931-B2-250 is a powerful industrial communication gateway designed for seamless integration between M-Bus metering networks and MQTT-based IoT systems. Supporting up to 250 M-Bus slave devices, it is particularly suited for large-scale applications such as smart cities, building management systems (BMS), district heating, water distribution monitoring, and energy efficiency projects. Its ability to read and publish data from a wide variety of meters makes it a versatile solution for integrators and system designers working with heterogeneous infrastructures.

The device communicates via the MQTT protocol, ensuring fast and reliable data transfer to supervisory systems and IoT platforms. By supporting TLS/SSL encryption, the gateway guarantees secure data exchange even in critical environments, where cybersecurity and information confidentiality are mandatory. Compatibility with well-known brands such as SIEMENS, Kamstrup, Maddalena, Sontex, and many others ensures that the HD67931-B2-250 can be easily implemented in diverse metering infrastructures without the need for additional middleware or protocol converters.

Configuration and deployment are simplified through the free SW67931 software, which allows users to define communication parameters, select monitored variables, and perform firmware updates directly from a PC. With features like electrical isolation between Ethernet and M-Bus lines, wide input power supply range (15…21V AC or 18…35V DC), and robust DIN rail mounting, the device guarantees reliable operation in harsh industrial environments. Operating within a temperature range of -40°C to +70°C and with a startup consumption of 30W, the converter offers exceptional durability and performance for mission-critical applications.

HD67931-B2 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 DIN Rail
• Wide power supply input range: 18...35V DC

Specifications:

• Ports: 1x Ethernet, 1x MBus
• Ethernet protocol: MQTT
• Ethernet connector: RJ45
• MBus protocol: MBus master
• MBus connector: 2way 5mm fixed screw terminal
• Data Rates MBus: Up to 38400 bps
• Data Rates MQTT: 10/100 Base-T with autosensing
• Power supply: 15...21V AC; 18...35V DC
• Power supply connector: 2way 5mm terminal block
• Operating temperature: -40°C/+70°C (-40°F/+185°F)
• Dimensions: 71 mm x 60 mm x 95 mm (DxWxH)
• Weight: approx. 200g
• Maximum power consumption at converter start-up: 30W
• Mechanical fixing: DIN Rail mount
• Software: SW67931
• ORDER CODE: HD67931-B2-250

Configurator – Software SW67931 FREE DOWNLOAD

Manufacturer's warranty: 24 months

---