HD67C05-5-G43-E-B2 industrial Modbus Slave and MQTT Broker converter with LAN, LTE SIM and eSIM

HD67C05-5-G43-E-B2 – Modbus Slave and MQTT Broker Converter with LAN, LTE SIM and eSIM.

The HD67C05-5-G43-E-B2 is a high-performance industrial protocol converter that combines a Modbus Slave interface with a fully integrated MQTT Broker. With three independent communication paths – Ethernet LAN, LTE SIM and embedded eSIM – the device ensures maximum connectivity redundancy, making it ideal for remote installations, IoT platforms, SCADA systems, BMS automation and energy monitoring applications.

Designed for demanding industrial environments, the device features galvanic isolation between the power supply and Ethernet port, a DIN-Rail housing type B, and a wide operating temperature range suitable for outdoor and indoor installations. HD67C05-5-G43-E-B2 integrates seamlessly into automation networks that require stable communication, safe operation and long-term reliability.

Key Features of the HD67C05-5-G43-E-B2

• Modbus Slave (RS485) – compatible with standard Holding/Input registers.
• MQTT Broker with publish/subscribe, JSON RAW templates, QoS, retained messages.
• Triple connectivity: Ethernet LAN, LTE SIM slot and embedded eSIM.
• MQTT 3.1 / 3.1.1 / MQTT 5.0 support for cloud and IIoT platforms.
• Advanced LTE configuration including APN, authentication and signal diagnostics.
• Modbus Slave speed up to 115200 bps.
• Galvanic isolation between power supply and Ethernet interface.
• LED indicators for device status, Modbus activity, MQTT activity and errors.
• Recovery button (BTN1) for factory reset or firmware recovery.
• DIN-Rail housing type B, compact and easy to mount.
• Operating temperature from −40°C to +85°C.

How the HD67C05-5-G43-E-B2 Works

The device operates as a Modbus Slave on RS485, receiving process values, alarms and status information from field equipment. These data points are then made available through its integrated MQTT Broker using customizable topic structures, JSON encoding, QoS levels and update intervals.

The converter supports fully bidirectional communication, allowing cloud platforms, dashboards or remote applications to write values back to Modbus registers via MQTT SUBSCRIBE. This makes the HD67C05-5-G43-E-B2 a central communication hub between OT (Operational Technology) and IT / IoT systems.

Ports and Communication

• 1× RS485 Modbus Slave (3-way terminal block, 5 mm spacing). Supports cable runs up to 1200 m with proper termination.
• 1× Ethernet LAN RJ45 supporting 10/100 Base-T autosensing.
• LTE SIM slot plus integrated eSIM for redundant mobile connectivity.
• SMA antenna connector for LTE signal optimization.
• Power supply: 8…24 V AC or 12…35 V DC (2-way terminal block).
• Status LEDs: Device, Error, Modbus, MQTT.

Technical Specifications

• Modbus Slave speed: up to 115200 bps
• MQTT: 10/100 Base-T (autosensing)
• Operating temperature: −40°C to +85°C
• Dimensions: 70 × 60 × 95 mm
• Weight: approx. 200 g
• Mounting: DIN-Rail 35 mm
• Housing type: B
• Configuration software: SW67C05
• Order code: HD67C05-5-G43-E-B2

Software Download – SW67C05

The official configuration software for Modbus, MQTT, LTE/eSIM, bridges, ACL lists and firmware updates can be downloaded using the link below:

Download SW67C05

Applications

• Industrial Modbus-to-MQTT data integration.
• Remote installations requiring LTE SIM/eSIM redundancy.
• Cloud data acquisition and real-time IoT dashboards.
• SCADA, BMS and building automation systems.
• Water treatment, telemetric and environmental monitoring.
• Energy management, HVAC control and predictive maintenance.