HD67C04-5-G43-VPN-B2 Modbus Master and MQTT Broker with LAN, LTE and VPN – Industrial Communication Converter

HD67C04-5-G43-VPN-B2 – Industrial Modbus Master and MQTT Broker with LAN, LTE and VPN Service.

The HD67C04-5-G43-VPN-B2 is a high-performance industrial protocol converter designed to link Modbus RTU networks with MQTT applications in a secure and reliable way. This model is enhanced with an integrated VPN service, enabling encrypted, protected communication between remote installations and supervisory platforms such as SCADA, cloud IoT systems or analytical dashboards.

Download software (SW67C04):
Click here to download the configuration software

Operating simultaneously as a Modbus Master and an internal MQTT Broker, the device reads field data from RS485 networks and distributes it through MQTT topics to upper-level platforms. The G43 variant includes LTE SIM connectivity, making the converter ideal for remote or infrastructure-limited locations where wireless communication is required. Built in a robust type B housing with DIN rail mounting, it is engineered for continuous operation in harsh industrial environments, featuring an extended temperature range from -40°C to +85°C.

Key Features and Advantages

• Integrated VPN service for secure, encrypted remote communication.
• Modbus Master (RS485) for polling and controlling Modbus field devices.
• Embedded MQTT Broker enabling local publish/subscribe communication.
• LAN + LTE SIM connectivity for reliable and redundant data transmission.
• Advanced MQTT configuration with topics, JSON payloads, QoS and publication rules.
• Galvanic isolation for enhanced safety between Ethernet and power supply.
• Industrial DIN rail housing optimized for automation cabinets.
• Wide operating temperature range designed for demanding environmental conditions.

How the HD67C04-5-G43-VPN-B2 Works

The converter works as a Modbus Master, periodically reading data from RS485 devices such as PLCs, energy meters, HVAC controllers and various industrial sensors. The collected values are transformed into MQTT topics and served through the built-in MQTT Broker, allowing easy integration with IoT platforms, cloud systems and SCADA applications. It also enables bidirectional communication by writing MQTT received values back into Modbus registers.

The integrated VPN service ensures that all communication is encrypted and protected, making it suitable for remote installations, energy sites, distributed infrastructure and industrial telemetry systems. LTE SIM functionality allows the converter to operate even in locations without fixed-line connectivity.

Ports and Connectivity

• 1× RS485 Modbus Master – 3-way screw terminal (5 mm).
• 1× Ethernet RJ45 – 10/100 Base-T autosensing.
• 1× LTE SIM slot – mobile data communication.
• 1× 2-pin power terminal – 5 mm pitch.

Technical Specifications

• Modbus Master speed: up to 115200 bps
• MQTT Ethernet: 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: SW67C04
• Order code: HD67C04-5-G43-VPN-B2

Applications

• SCADA systems requiring encrypted VPN communication.
• Industrial IoT and cloud data integration via MQTT.
• Energy monitoring, photovoltaic installations and remote substations.
• Distributed infrastructure using LTE as primary or backup connectivity.
• HVAC, BMS, and advanced automation systems.

Technical Support and Deployment

Consteel Electronics offers complete support for VPN setup, Modbus configuration, MQTT topic mapping, LTE SIM activation and system integration. We can prepare a ready-to-deploy configuration tailored to your application and ensure seamless commissioning in industrial environments.