HD67C04-2-G43-VPN-B2 Modbus Master and MQTT Broker Converter with LAN, LTE SIM and VPN

HD67C04-2-G43-VPN-B2 Modbus Master and MQTT Broker Converter with LAN, LTE SIM and VPN.

The HD67C04-2-G43-VPN-B2 is an advanced industrial protocol converter that combines the functionality of a Modbus Master with a fully integrated MQTT Broker. In this VPN-enabled version, the device includes a secure VPN service that ensures encrypted communication between field equipment, supervisory systems and remote cloud platforms. This makes the HD67C04-2-G43-VPN-B2 ideal for installations requiring both reliable data transfer and strong cybersecurity.

With connectivity options including Ethernet LAN and LTE SIM, the converter provides flexible and redundant communication paths suitable for industrial IoT, SCADA systems, building automation and remote monitoring scenarios. The VPN service enhances data integrity and confidentiality, allowing secure access from remote locations or central control rooms.

Key Features of the HD67C04-2-G43-VPN-B2

• Integrated VPN service for secure and encrypted industrial communication.
• Modbus Master interface for controlling and reading Modbus field devices.
• MQTT Broker functionality supporting data publishing and subscribing.
• LAN and LTE SIM communication for redundant and flexible network access.
• Advanced configuration through the SW67C04 software suite.
• Diagnostic LEDs for device status, communication activity and error indication.
• Industrial-grade design with galvanic isolation and robust EMC performance.
• Wide operating temperature range from -40°C to +85°C for harsh environments.
• DIN Rail mounting for seamless integration into control panels.

How the Converter Works

The HD67C04-2-G43-VPN-B2 acts as a Modbus Master, polling data from field devices and preparing it for structured distribution through its integrated MQTT Broker. Data can be published as MQTT topics or processed as subscribed messages that can be written back to Modbus devices. Topic management, JSON formatting, quality of service settings and update intervals can all be fully customized in the configuration software.

With the added VPN service, all communication between remote installations, cloud systems or supervisory software is securely encrypted. This ensures safe data exchange across public networks and meets demanding industrial cybersecurity requirements.

Ports and Connectivity

• 1 Modbus Master port using a 3-way 5 mm terminal block.
• 1 Ethernet port RJ45 with 10/100 Base-T autosensing.
• LTE SIM slot for cellular communication.
• Power connector via 2-way 5 mm terminal block.
• Status LEDs for Modbus, MQTT, errors and device status.

Technical Specifications

• Modbus Master speed: up to 115200 bps
• MQTT communication: 10/100 Base-T autosensing
• Dimensions: 70 x 60 x 95 mm
• Weight: approximately 200 g
• Power supply: 8 to 24 V AC or 12 to 35 V DC
• Operating temperature: -40°C to +85°C
• Mounting: DIN Rail
• Software: SW67C04
• Order code: HD67C04-2-G43-VPN-B2

Software Download (SW67C04)

The official SW67C04 configuration software for Modbus, MQTT, Ethernet and LTE/VPN settings can be downloaded here:

Download SW67C04 Software

Applications

• Secure industrial IoT communication with VPN tunnels.
• Remote monitoring through LTE connectivity.
• MQTT data aggregation for automation and cloud systems.
• SCADA, BMS and industrial platforms requiring secure data transfer.
• Distributed installations and outdoor systems.
• Energy management, HVAC and environmental monitoring.

Technical Support and Configuration Assistance

Consteel Electronics provides full support for device configuration, MQTT topic mapping, Modbus Master polling, LTE SIM setup and VPN service activation. Our team can prepare a ready-to-use configuration tailored to your application to ensure seamless deployment.