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

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

The HD67C04-2-G43-E-VPN-B2 is a high-performance industrial converter that integrates Modbus Master communication with an on-board MQTT Broker, enhanced with a secure and fully configurable VPN service. This model includes both a physical LTE SIM slot and an embedded eSIM, allowing unprecedented communication redundancy and enabling stable connectivity even in remote or infrastructure-limited locations. According to the official manual, this version is specifically designed for applications requiring LTE SIM + eSIM + VPN.

With Ethernet LAN, LTE SIM, eSIM and VPN encryption, the device ensures secure data transmission between Modbus networks, SCADA platforms, cloud systems and mobile IoT applications. The HD67C04-2-G43-E-VPN-B2 is suitable for industrial automation, energy monitoring, building management systems, asset management and harsh remote installations operating in extreme temperatures from -40°C to +85°C.

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

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

• Integrated VPN Service for encrypted communication.
• Embedded eSIM module plus physical LTE SIM slot for dual mobile connectivity.
• MQTT Broker functionality with configuration of clients, topics and access rules.
• Modbus Master with full control of Modbus Read/Write operations.
• Electrical isolation between Ethernet and power supply.
• Wide supply range: 12–35 V DC or 8–24 V AC.
• Four status LEDs for Modbus, MQTT, device state and errors.
• DIN Rail mountable Modulbox enclosure type B (page 41).
• Full configuration via SW67C04 software.

How the Converter Operates

The device functions as a Modbus Master, polling data from field devices such as PLCs, meters, controllers and remote sensors. Using the integrated MQTT Broker, these values can be instantly published to local or remote subscribers, cloud platforms, dashboards or SCADA systems. MQTT topic configuration includes QoS levels, retained messages, JSON or RAW payloads and multi-variable templates.

The VPN service adds a critical cybersecurity layer by encrypting all traffic between remote installations and central infrastructure. This ensures safe operation when communicating over public networks, LTE networks or shared communication media.

• 1 Modbus Master port – 3-way 5 mm terminal block.
• 1 Ethernet port RJ45, 10/100 Base-T autosensing.
• LTE SIM slot (Micro-SIM) for cellular connectivity.
• Embedded eSIM for LTE service.
• Power connector – 2-way 5 mm terminal block.
• LED diagnostics for Modbus, MQTT, device state and errors.

Technical Specifications

• Modbus Master speed: up to 115200 bps
• MQTT communication: 10/100 Base-T autosensing
• Dimensions: 70 x 60 x 95 mm
• Weight: approx. 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 35 mm
• Software: SW67C04
• Order code: HD67C04-2-G43-E-VPN-B2

Applications

• Secure industrial IoT applications requiring VPN encryption.
• Remote monitoring and control using LTE SIM or eSIM.
• MQTT Broker-based systems with Modbus field devices.
• SCADA, BMS and industrial automation platforms.
• Energy management and distributed infrastructure monitoring.
• Environmental, utility and building automation systems.

Technical Support and Assistance

Consteel Electronics provides complete technical assistance, including configuration of Modbus polling, MQTT topic mapping, LTE SIM and eSIM settings, and VPN activation. Our engineers can prepare a ready-to-use configuration tailored to your industrial application to ensure fast and reliable deployment.