HD67C05-5-G43-B2 Industrial Modbus Slave and MQTT Broker Converter with LAN and LTE

HD67C05-5-G43-B2 – Industrial Modbus Slave and MQTT Broker Converter with LAN and LTE.

The HD67C05-5-G43-B2 is an industrial-grade converter combining Modbus RTU in Slave mode with a fully integrated MQTT Broker, enabling seamless data exchange between RS485 automation systems and cloud or IoT platforms. The G43 version adds LTE connectivity with SIM, providing communication redundancy or allowing deployment in remote locations without wired Ethernet access.

Designed for demanding industrial environments, the converter supports a wide 8…24V AC / 12…35V DC power input range, offers electrical isolation between Ethernet and the power section, and operates from -40°C to +85°C. Its compact type-B DIN rail housing ensures easy installation in control cabinets and distributed field locations.

Key Features and Advantages

• Modbus RTU Slave (RS485) – fully configurable mapping of MQTT data into Modbus Holding/Input Registers.
• Integrated MQTT Broker – JSON/RAW payloads, ACL lists, QoS, client management and cyclic publishing.
• LTE connectivity (G43) – Micro-SIM support, APN configuration, SMA antenna interface.
• Galvanic isolation between Ethernet and the power supply for enhanced protection.
• Configuration using SW67C05 – MQTT settings, Modbus mapping, network setup and LTE parameters.
• Diagnostic LEDs – RS485 activity, network communication, device status and error indicators.
• Industrial durability – wide temperature range and high EMC immunity.
• DIN rail mounting – compact Modulbox 4M enclosure.

How the Converter Works

In Modbus Slave mode, the device exposes data received through MQTT topics directly as Modbus registers, allowing PLCs, SCADA and BMS systems to access IoT- or cloud-originating information through RS485. The converter can also publish Modbus data to MQTT topics in JSON or RAW format, either cyclically, on change, or on demand.

Using the SW67C05 software, users can configure topic structures, client permissions, QoS, data formats and MQTT Bridges. The HD67C05-5-G43-B2 can act as a central data hub connecting multiple MQTT clients and Modbus networks.

Ports and Connectivity

• 1× RS485 Modbus Slave – 3-pin screw terminal, 5 mm pitch
• 1× Ethernet RJ45 – 10/100 Mbps autosensing
• 1× SIM slot (G43) – LTE connectivity
• 2-pin power connector – screw terminal

Technical Specifications

• Modbus Slave speed: up to 115200 bps
• MQTT via Ethernet/LTE: 10/100 Base-T autosensing
• Power supply: 8…24 V AC or 12…35 V DC
• Operating temperature: -40°C to +85°C
• Dimensions: 70 × 60 × 95 mm
• Weight: approx. 200 g
• Mounting: DIN Rail 35 mm
• Software: SW67C05
• Order code: HD67C05-5-G43-B2

Configuration Software

The official SW67C05 configuration tool for Modbus, MQTT, Ethernet and LTE settings is available here:

Download SW67C05 Software

Summary

The HD67C05-5-G43-B2 is a robust and versatile industrial converter enabling seamless integration of Modbus RTU data with MQTT-based IoT or cloud systems, enhanced by LTE connectivity. With high reliability, industrial-grade construction, isolation, flexible configuration and wide environmental tolerance, it is an ideal choice for modern automation, energy monitoring and IoT infrastructures.