HD67C04-2-G43-B2 Modbus Master and MQTT Broker Converter with LAN and LTE

HD67C04-2-G43-B2 Modbus Master and MQTT Broker Converter with LAN and LTE Connectivity.

The HD67C04-2-G43-B2 is a high-performance industrial protocol converter designed to integrate Modbus Master networks with MQTT Broker environments. It combines Modbus Master functionality with a complete MQTT Broker engine, enabling seamless communication between automation devices and modern IoT platforms. Equipped with both Ethernet and LTE SIM connectivity, it is an ideal choice for applications requiring remote access, cloud integration and reliable field data acquisition.

This model is part of the HD67C04 industrial series and supports all features described in the official ADFweb documentation, such as MQTT topic management, Modbus polling configuration, publishing and subscribing, advanced bridges and access rules. The G43-B2 configuration adds an LTE modem with Micro-SIM support, allowing installation in locations without fixed network infrastructure.

Key Features of the HD67C04-2-G43-B2

• Modbus Master interface using a 3-pin terminal block for reading and writing data from RS232 Modbus devices.
• MQTT Broker functionality for publishing and subscribing industrial data through LAN or LTE.
• LTE communication with Micro-SIM, configurable APN, PIN, username and password.
• MQTT 3.1, 3.1.1 and 5.0 support depending on configuration.
• Topic management and data mapping including configurable JSON templates, variable mapping and publishing intervals.
• LED status indicators for device status, communication activity and diagnostics.
• Wide operating temperature range from -40°C to +85°C, suitable for harsh industrial environments.
• Industrial-grade isolation and power protection for long-term reliability.
• Software configuration through ADFweb Compositor SW67C04.
• Compact DIN Rail housing type B for easy installation.

How the HD67C04-2-G43-B2 Works

The converter operates as a Modbus Master polling field devices and collecting process values such as measurements, statuses, alarms and setpoints. These data points are processed and published through the integrated MQTT Broker, making them available to IoT applications, cloud platforms, dashboards or SCADA systems that support MQTT.

The device also supports customizable topic structures, quality of service levels, retained messages and JSON formatting. With bidirectional communication, the MQTT subscriber functionality enables writing from cloud or edge applications back to Modbus devices. This makes the HD67C04-2-G43-B2 a central communication hub for distributed industrial IoT architectures.

Ports and Connections

• 1 Modbus Master port on a 3-way 5 mm terminal block.
• 1 Ethernet port RJ45 supporting 10/100 Base-T autosensing.
• Micro-SIM slot for LTE connectivity.
• External SMA antenna connector for LTE signal optimization.
• Power supply via 2-way 5 mm terminal block, 8 to 24 V AC or 12 to 35 V DC.

Technical Specifications

• Modbus Master speed: up to 115200 bps
• MQTT communication: 10/100 Base-T
• Dimensions: 70 x 60 x 95 mm
• Weight: approximately 200 g
• Mounting: DIN Rail
• Operating temperature: -40°C to +85°C
• Software: SW67C04
• Order code: HD67C04-2-G43-B2

Software Download (SW67C04)

The official configuration software SW67C04 for Modbus, MQTT, Ethernet and LTE settings can be downloaded here:

Download SW67C04 Software

Technical Support and Configuration Assistance

Consteel Electronics provides complete support for configuration, MQTT mapping, Modbus polling setup, LTE settings and integration with industrial software. Our engineers help you prepare a ready-to-run configuration optimized for your application.