HD67934-2-B2 Industrial Modbus Slave to MQTT Converter with TLS/SSL and Sniffer Function

Industrial Modbus slave to MQTT converter, housing type B (wide), DIN rail mount. 

The HD67934-2-B2 is a high-performance industrial gateway that enables seamless integration between Modbus Slave devices and MQTT-based IoT infrastructures. It allows both publishing and receiving data via an MQTT server, enabling full bidirectional communication with Modbus Masters such as PLCs, SCADA systems, or building management controllers. In addition, it supports a unique Sniffer function that can capture and forward data from an existing Modbus network without disrupting ongoing operations, making it ideal for non-intrusive monitoring.

This converter is fully compatible with a wide range of MQTT brokers and IoT servers, allowing integration into on-premises and cloud-based IIoT solutions. The inclusion of TLS/SSL encryption ensures that all transmitted data is secure and protected from unauthorized access, meeting modern industrial cybersecurity requirements. Designed for rapid deployment, the HD67934-2-B2 supports Modbus communication speeds up to 115200 bps and features an auto-sensing Ethernet port to optimize connectivity without manual configuration.

Built into a robust type B enclosure for DIN rail mounting, the device is easy to install in industrial cabinets and control panels. Its wide operating temperature range of -40°C to +85°C ensures reliable performance in harsh environments, from freezing outdoor installations to high-heat industrial zones. Configuration is simplified through the free SW67934 software, which offers intuitive setup for MQTT and Modbus parameters, topic mapping, and firmware updates.

Configuration:

Thanks to the SW67934 software on your PC you can:

• Define MQTT connection parameters, including broker address, port, credentials, and topic configuration
• Set Modbus communication parameters such as baud rate, parity, stop bits, and timeouts
• Define MQTT topics to be published and subscribed for data exchange with the MQTT server
• Enable Sniffer mode to capture data from an existing Modbus network without interrupting operations
• Update the device firmware to maintain compatibility with new protocols and security standards

Characteristics:

• Electrical isolation between Ethernet and Modbus to improve communication stability
• Mountable on standard 35mm DIN rail for easy installation
• Wide power supply range: 18...35V DC or 8...24V AC for versatile industrial setups
• Compact, rugged design suitable for demanding environments
• High resistance to electromagnetic interference (EMI)

Specifications:

• Ports: 1x Ethernet, 1x RS-232
• Serial port protocol: Modbus Slave (RS-232)
• Ethernet protocol: MQTT
• Ethernet connector: RJ45
• Modbus connector: 2-way 5mm terminal block
• Data rates Modbus: up to 115200 bps
• Data rates MQTT: 10/100 Base-T with autosensing
• Power supply: 8…24VAC / 12…35VDC
• Power supply connector: 3-way 5mm terminal block
• Operating temperature: -40°C to +85°C (-40°F to +185°F)
• Dimensions: 60 mm x 36 mm x 95 mm (DxWxH)
• Weight: approx. 200g
• Mechanical fixing: DIN rail mount
• Software: SW67934
• Order code: HD67934-2-B2

The HD67934-2-B2 is ideal for remote monitoring, predictive maintenance, energy management, and process automation applications that require secure, real-time integration between Modbus devices and IoT platforms. The Sniffer function makes it especially valuable for upgrading legacy Modbus installations to IIoT readiness without interrupting production workflows.

By supporting standard MQTT payload formats, the converter allows easy integration with dashboards, analytics platforms, and databases. The combination of TLS/SSL encryption, electrical isolation, and wide environmental tolerance makes the HD67934-2-B2 a future-proof choice for modern industrial systems aligned with Industry 4.0 standards.

Configurator – Software SW67934 FREE DOWNLOAD

Manufacturer's warranty: 24 months