HD67931-B2-433MHz-40 Industrial M-Bus Wireless to MQTT Gateway, 40 Slaves, 433 MHz, DIN

HD67931-B2-433MHz-40 – Industrial MBus Wireless to MQTT converter, master MBus up to 40 slaves, housing type B (wide), DIN rail mount. 

The HD67931-B2-433MHz-40 is a professional industrial gateway that bridges M-Bus Wireless networks with MQTT servers. Supporting up to 40 slaves, it is optimized for energy and utilities monitoring across large facilities. Operating at 433 MHz, it ensures robust wireless communication with good penetration through walls and building structures, making it suitable for both residential complexes and industrial plants.

Data collected from M-Bus meters is published directly to MQTT topics, enabling real-time integration with IoT platforms, cloud dashboards, or BMS/EMS solutions. By supporting TLS/SSL encryption, the gateway guarantees secure data transmission, protecting sensitive metering information. Thanks to its wide 18…35 V DC power supply range and -40…+85 °C operating temperature, the device provides reliable performance even in harsh conditions.

The unit is compatible with a variety of meters from SIEMENS, Kamstrup, Maddalena, Sontex and others. With the included SW67931 software, configuration is simple: users can define MQTT settings, M-Bus parameters, and select which variables should be sent to the broker. This flexibility makes the device an excellent choice for tenant billing, sub-metering, smart metering and remote energy management.

HD67931-B2-433MHz-40 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.

Use cases:

• Smart metering – centralized reading of water, gas and heat meters.
• Energy monitoring – integration with SCADA/BMS for consumption analysis.
• Tenant billing – publish data to MQTT for automated billing systems.
• IoT and cloud integration – easy connection to dashboards and analytics tools.

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

Configuration best practices:

• Enable TLS/SSL encryption for secure MQTT sessions.
• Organize MQTT topics in a logical hierarchy (e.g. building/floor/meter/parameter).
• Choose appropriate QoS levels depending on SCADA or cloud platform needs.
• Validate 433 MHz signal strength and antenna placement to avoid interference.

Characteristics:

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

Installation and wiring:

• Ethernet (RJ45) – 10/100 Base-T autosensing, recommended VLAN for IoT traffic.
• M-Bus – 2-way 5 mm terminal block for wired meters.
• M-Bus Wireless – 433 MHz via SMA antenna; check positioning for coverage.
• Power supply – 18…35 V DC, with start-up consumption up to 30 W.

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: 433 MHz
• Data Rates MQTT: 10/100 Base-T with autosensing
• Data Rates MBus: Up to 38400 bit/s
• Power supply: 18...35V DC
• 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)
• Maximum power consumption at converter start-up: 30W
• Weight: 200g approx
• Mechanical fixing: DIN Rail mount
• Software: SW67931
• ORDER CODE: HD67931-B2-433MHz-40

Configurator – Software SW67931 FREE DOWNLOAD

Manufacturer's warranty: 24 months

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