HD67C06-G43-B2 – Industrial Modbus TCP Master to MQTT Broker Converter with LAN and LTE

HD67C06-G43-B2 – Industrial Modbus TCP Master to MQTT Broker Converter with LTE Connectivity and Housing Type B.

The HD67C06-G43-B2 is a high-performance industrial communication gateway designed to bridge Modbus TCP Master networks with modern MQTT Broker infrastructures used in IoT and IIoT applications. It enables seamless communication between automation systems, PLCs, industrial controllers and cloud platforms without requiring additional middleware or external brokers.

As part of the HD67C06 family, this model integrates Ethernet-based Modbus TCP Master functionality with a fully embedded MQTT Broker engine. The G43 variant adds LTE connectivity (SIM card), making it ideal for remote, mobile or distributed installations where wired infrastructure may be unavailable or where communication redundancy is required. Housing Type B and screw-terminal connectors ensure robust, vibration-resistant wiring in demanding industrial environments.

Modbus TCP Master – reliable data acquisition from industrial devices

Operating as a Modbus TCP Master, the HD67C06-G43-B2 can query multiple slave devices, collect registers, monitor machine states and convert these values into structured MQTT topics. This enables direct mapping of field data into cloud-based monitoring platforms, SCADA integrations or analytics systems.

• Master mode for multiple Modbus TCP slaves.
• Transmission speed: 10/100 Base-T Autosensing.
• Support for complex register tables and polling sequences.
• Stable communication confirmed across industrial Ethernet networks.
• Electrical isolation between power and Ethernet (as documented in the manual).

Embedded MQTT Broker – edge-level IoT communication without external servers

The integrated MQTT Broker eliminates the need for an external MQTT server, enabling local publish/subscribe communication between connected clients and field devices. This reduces latency, improves reliability and simplifies system architecture.

• Multi-client MQTT communication.
• Publish and subscribe support.
• Topic templates and JSON mapping.
• Ideal for AWS IoT, Azure, Google IoT, IBM Cloud and on-premise MQTT systems.

This makes the converter an excellent choice for predictive maintenance, telemetry, industrial dashboards and system-wide IoT integrations.

Dual communication: Ethernet LAN + LTE SIM for remote installations

The G43 version introduces mobile network communication, allowing the device to operate in locations where wired infrastructure is limited or unavailable. LTE can be used as the primary channel or a redundant backup to ensure continuous data flow.

• Ethernet (RJ45) – configuration and primary communication channel.
• LTE SIM – mobile Internet connection for remote sites.
• SMA Female antenna connector – enabling use of external antennas for improved LTE coverage.

This dual-path communication ensures flexibility for distributed automation, energy infrastructure, transport systems and off-grid monitoring applications.

Configuration via SW67C06 software

The device is configured using the SW67C06 software tool, which provides full control over:

• Modbus TCP Master parameters,
• MQTT Broker topic structure and client management,
• Ethernet and LTE network settings,
• Data routing and mapping functions,
• Firmware updates and diagnostics.

Download the software here:
DOWNLOAD SW67C06

Technical specifications

• Ports: 1× Ethernet; SIM Card
• Modbus TCP protocol: Modbus TCP Master
• Ethernet/LTE protocol: MQTT Broker
• Connectors: RJ45 (Modbus TCP), RJ45 + SIM (MQTT/LTE)
• Data rates Modbus TCP: 10/100 Base-T Autosensing
• Data rates MQTT: 10/100 Base-T Autosensing
• Power supply: 8…24V AC; 12…35V DC
• Power connector: 2-way 5 mm screw terminal
• Operating temperature: -40°C…+85°C
• Dimensions: 70 × 60 × 95 mm (D × W × H)
• Weight: approx. 200 g
• Mechanical fixing: DIN rail mount
• Software: SW67C06
• Order code: HD67C06-G43-B2

If you need assistance integrating Modbus TCP networks with MQTT Broker systems, or if you want to confirm compatibility with your automation architecture, our engineering team is ready to help.