HD67C05-2-G43-E-B2 Industrial Modbus Slave and MQTT Broker Converter with LAN, LTE and eSIM

HD67C05-2-G43-E-B2 – Industrial Modbus Slave and MQTT Broker Converter with LAN, LTE and eSIM.

The HD67C05-2-G43-E-B2 is a high-performance industrial communication converter designed to connect Modbus RTU Slave networks with modern MQTT infrastructures used in IoT, SCADA, remote monitoring and building automation systems. The device is equipped with LTE connectivity and an integrated eSIM module, providing dual mobile communication paths and ensuring continuous, reliable data transfer even in remote or infrastructure-limited environments.

Download software (SW67C05):
Click here to download the configuration software

According to the technical documentation, the converter operates within an extended temperature range of -40°C to +85°C, supports 8…24 V AC / 12…35 V DC power supply, and features electrical isolation between Ethernet and the power section for enhanced safety and stability in industrial installations. The robust type-B housing with DIN rail mounting ensures quick and secure installation.

Key Features and Advantages

• Modbus Slave RS485 – exposes MQTT data as Modbus registers based on the predefined register map, supporting Holding and Input Registers with optional bit-level interpretation.
• Built-in MQTT Broker – supports multiple clients, topic configuration, JSON and RAW message formats, QoS levels, bridge connections and user authentication.
• LAN + LTE + eSIM connectivity – wired Ethernet plus dual mobile redundancy. LTE supports SMA antenna and Micro-SIM card as described in the mobile interface specifications.
• Galvanic isolation between Ethernet and power supply for improved reliability.
• SW67C05 software – configuration of Modbus parameters, MQTT topics, network interfaces, security and mobile APN settings.
• Diagnostic LEDs – indicators for device status, RS485 activity, network operation and error conditions.
• Recovery Mode – allows restoring the device in case of a failed firmware update or configuration issue.

How the Converter Works

In Modbus Slave mode, the HD67C05-2-G43-E-B2 publishes incoming MQTT data into Modbus registers, making it accessible for PLCs, SCADA controllers and other industrial devices that communicate over RS485. This ensures full compatibility with legacy systems that require Modbus access to IoT-driven data.

At the same time, the device functions as an MQTT Broker, enabling publish/subscribe communication across multiple clients, handling bidirectional data flow and synchronizing Modbus registers with MQTT topics. It can also operate alongside external brokers using MQTT Bridge functionality.

Ports and Connectivity

• 1× RS485 Modbus Slave – 3-way screw terminal (5 mm).
• 1× Ethernet RJ45 – 10/100 Base-T autosensing.
• LTE SIM + integrated eSIM – dual mobile connectivity for redundancy.
• 2-pin screw power connector – 5 mm pitch.

Technical Specifications

• Modbus Slave speed: up to 115200 bps
• MQTT Ethernet: 10/100 Base-T autosensing
• LTE SIM/eSIM: SMA antenna connector, Micro-SIM slot, integrated eSIM
• 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: HD67C05-2-G43-E-B2

Applications

• IoT platforms using MQTT communication.
• Remote monitoring, telemetry and energy management.
• HVAC and BMS control systems.
• Industrial and photovoltaic installations.
• Distributed field infrastructure requiring LTE + eSIM redundancy.

The HD67C05-2-G43-E-B2 is a reliable, flexible and secure industrial converter that bridges Modbus Slave devices with MQTT-based systems. With dual LTE and eSIM connectivity, wide temperature tolerance and robust electrical design, it is an excellent choice for advanced industrial automation, IoT deployments and remote field applications requiring continuous communication.