HD67C06-G43-VPN-B2 Modbus TCP Master with MQTT Broker and VPN for Secure IoT Integration

HD67C06-G43-VPN-B2 – Modbus TCP Master and MQTT Broker with VPN and LTE Connectivity.

HD67C06-G43-VPN-B2 is a high-performance industrial gateway that combines Modbus TCP Master functionalities with a powerful built-in MQTT Broker. Equipped with an integrated VPN service, it ensures fully encrypted communication between field devices, SCADA systems and cloud applications. This makes it ideal for critical infrastructure, distributed IoT networks, BMS systems and secure remote monitoring.

The G43 variant adds LTE SIM connectivity, enabling installation in locations that lack wired internet access and providing communication redundancy. With a robust industrial housing, DIN-rail mount, wide supply range and an operating temperature of −40°C to +85°C, the device delivers stability even in harsh industrial conditions.

Key Features of the HD67C06-G43-VPN-B2

• Integrated VPN service for encrypted and secure industrial communication.
• Modbus TCP Master for reading and writing data across TCP/IP networks.
• MQTT Broker supporting full publish/subscribe workflows.
• LTE SIM communication for remote installations and backup connectivity.
• Dual communication paths – Ethernet LAN + LTE with automatic failover.
• Galvanic isolation between power supply and Ethernet interface.
• Diagnostic LEDs for MQTT, Modbus TCP, device status and error indications.
• Industrial-grade housing Modulbox 4M, designed for DIN-rail mounting.
• Configuration via SW67C06 (Modbus TCP, MQTT, JSON mapping, bridges).

How the HD67C06-G43-VPN-B2 Works

The converter operates as a Modbus TCP Master, collecting process data from industrial devices and transforming it into MQTT messages using the integrated MQTT Broker. Using the SW67C06 configuration tool, users can define custom topic structures, JSON payloads, data update intervals, QoS levels and mapping rules for both single variables and complex multi-point data frames.

The integrated VPN service ensures that all communication between field locations, cloud services and SCADA platforms is encrypted. This is essential for energy systems, automation networks, remote cabinets, water/wastewater installations and IoT setups operating over public networks.

Ports and Connectivity

• 1× Ethernet RJ45 – 10/100 Base-T autosensing.
• LTE SIM slot providing mobile communication.
• 2-pin power connector (5 mm pitch).
• Status LEDs for device state, Modbus TCP, MQTT and errors.

Technical Specifications

• Modbus TCP: 10/100 Base-T autosensing
• MQTT: 10/100 Base-T autosensing
• Power supply: 8–24 V AC or 12–35 V DC
• Power consumption: approx. 5 W
• Operating temperature: −40°C to +85°C
• Dimensions: 70 × 60 × 95 mm
• Weight: approx. 200 g
• Software: SW67C06
• Order code: HD67C06-G43-VPN-B2

Applications

• Secure industrial IoT communication using VPN tunneling.
• Remote monitoring with LTE connectivity.
• Modbus TCP device integration with MQTT platforms.
• SCADA, BMS and automation systems requiring encrypted communication.
• Energy, HVAC, infrastructure and environmental monitoring.
• Redundant LTE communication for distributed installations.