HD67C03-5-G43-VPN-B2 – Industrial RS485 to MQTT Broker Converter with LAN, LTE SIM and VPN

HD67C03-5-G43-VPN-B2 – RS485 to MQTT Broker Converter with LAN, LTE SIM, VPN and Housing Type B.

The HD67C03-5-G43-VPN-B2 is a high-performance industrial converter designed to integrate RS485 serial devices with modern IoT and IIoT platforms using the MQTT Broker protocol. It belongs to the HD67C03 product family and is engineered for applications requiring secure, reliable and uninterrupted data exchange between field devices and cloud-based or on-premise monitoring systems.

What sets this model apart is its built-in VPN service, providing a secure communication channel through encrypted, authenticated industrial VPN tunnels. Combined with LAN and LTE SIM connectivity, the converter is ideal for remote installations where secure data transmission and redundancy are mission-critical.

Encased in a durable Housing Type B enclosure and equipped with screw-type terminal blocks, the HD67C03-5-G43-VPN-B2 ensures stable wiring and long-term mechanical reliability. It is designed for DIN rail mounting, enabling seamless integration into industrial automation cabinets.

All technical parameters are derived from the official product datasheet and the MN67C03 technical manual, including support for MicroSIM, LTE antenna connection via SMA Female connector, RS485 termination switches and MQTT Broker functions.

Secure RS485 integration with MQTT Broker and VPN encryption

The converter transforms serial RS485 data into MQTT topics, enabling seamless connectivity between legacy industrial equipment and cloud-hosted or edge-level IoT systems. The integrated VPN service adds a critical security layer for installations that rely on encrypted tunnels, secure network segmentation and protected access from remote sites.

Key advantages of the VPN functionality include:

• encrypted data traffic between field devices and central servers,
• secure remote access to industrial equipment,
• protection against unauthorized access and cyber threats,
• safe operation in distributed and outdoor IoT systems.

This makes the HD67C03-5-G43-VPN-B2 an excellent choice for energy networks, industrial telemetry, utility systems, transportation infrastructure and remote monitoring solutions.

LAN + LTE SIM – dual communication for reliability and flexibility

The device supports dual communication methods:

• Ethernet LAN (RJ45) – primary wired communication channel,
• LTE SIM – mobile communication for remote and distributed installations.

Thanks to these two independent communication paths, the converter can:

• operate in locations without wired infrastructure,
• maintain connectivity even when one channel fails,
• support mobile or temporary installations,
• deliver stable IoT connectivity for off-grid systems.

The LTE modem supports external SMA Female antennas, enabling long-range and high-signal-strength LTE integration for challenging environments such as industrial fields, tunnels, basements or areas with limited coverage.

Advanced RS485 communication and full MQTT Broker capabilities

The RS485 interface provides reliable serial communication with:

• speeds up to 115200 bps,
• 3-pin screw-type terminal connector,
• differential signalling resistant to industrial interference,
• DIP-switch termination (as specified in the MN67C03 documentation),
• support for multidrop bus architectures.

The integrated MQTT Broker engine supports:

• publish/subscribe communication,
• multiple simultaneous clients,
• configurable topics and payload structure,
• integration with cloud platforms and SCADA/BMS systems,
• IoT device data aggregation and routing.

Configuration via SW67C03 and built-in webserver

Configuration of the device is carried out using the SW67C03 configuration tool. Download the software here:
DOWNLOAD

With SW67C03 you can configure:

• all RS485 communication settings,
• MQTT Broker structure and clients,
• VPN profiles, routes and encryption settings,
• LAN parameters (IP, DNS, gateway, DHCP),
• LTE SIM parameters and mobile network profiles,
• data routing and topic mapping,
• firmware updates and diagnostics.

The device additionally includes an integrated webserver that allows:

• real-time activity and status monitoring,
• network and communication diagnostics,
• access to basic logs,
• management of MQTT sessions and connected clients.

Industrial design – Housing Type B, screw terminals and DIN rail mounting

The HD67C03-5-G43-VPN-B2 is built for long-term operation in industrial environments. Its main mechanical features include:

• Housing Type B (Modulbox 4M),
• Dimensions: 70 × 60 × 95 mm,
• DIN rail mounting: 35 mm standard rail,
• Weight: approx. 200 g,
• Screw-type terminal blocks for RS485, power supply and I/O connections,
• Operating temperature: -40°C…+85°C.

The rugged enclosure and connection system ensure resistance to vibration, electromagnetic disturbances, extreme temperatures and environmental fluctuations, making the device suitable for field installations, energy systems, industrial automation, utilities and infrastructure monitoring.

Technical specifications

• Ports: 1× RS485, 1× Ethernet, SIM Card
• Special function: VPN service
• RS485 protocol: differential serial bus
• MQTT Broker: full support for publish/subscribe
• Connectors: RS485 – 3-pin screw terminal; Network – RJ45 + SIM
• RS485 speed: up to 115200 bps
• MQTT speed: 10/100 Base-T Autosensing
• Power supply: 8…24 V AC or 12…35 V DC
• Operating temperature: -40°C…+85°C
• Dimensions: 70 × 60 × 95 mm
• Weight: approx. 200 g
• Software: SW67C03
• Order code: HD67C03-5-G43-VPN-B2

If you need assistance selecting the right RS485 to MQTT Broker converter with VPN and LTE, or you want to confirm whether this model fits your industrial communication architecture, our engineering specialists are ready to help.