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

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

The HD67C03-5-G43-E-B2 is an advanced industrial-grade communication converter designed to integrate RS485 serial devices into modern IoT and IIoT platforms using the MQTT Broker protocol. This model represents one of the most versatile and feature-rich variants of the HD67C03 family, designed for applications that require high reliability, redundant communication paths and long-term stable operation in demanding environments.

Equipped with Ethernet LAN, LTE communication via a MicroSIM card and an integrated eSIM module, the HD67C03-5-G43-E-B2 supports triple connectivity modes, making it ideal for distributed or remote installations that need continuous access to an MQTT Broker service even in locations without cable infrastructure. This level of flexibility is particularly valuable in telemetry, environmental monitoring, energy management, industrial automation and edge computing applications.

The device is housed in a robust Housing Type B enclosure, offering DIN rail mounting and screw-type terminal blocks for secure and vibration-resistant wiring. It is engineered for reliable performance in harsh industrial conditions, including extreme temperatures ranging from -40°C to +85°C. The hardware specifications listed in the HD67C03-5-G43-E-B2 datasheet manual cover full MQTT Broker functionality, RS485 communication, LTE modem behaviour, external LTE antenna connection via SMA Female, MicroSIM compatibility and integrated eSIM operation.

RS485 to MQTT Broker – modern integration of serial devices with IoT and IIoT systems

The converter transforms RS485 data into MQTT structures, allowing legacy and modern industrial devices to operate within cloud-based and IoT-oriented architectures. It is ideally suited for:

• industrial controllers and PLC systems,
• remote telemetry units,
• sensors and measurement devices,
• field automation modules,
• monitoring and analytics platforms.

Key features of the RS485 interface include:

• data transmission up to 115200 bps,
• differential signalling for long-distance and noise-resistant communication,
• 3-pin screw terminal connector,
• DIP-switch termination (as specified in the MN67C03 manual),
• support for multidrop serial bus networks.

The integrated MQTT Broker engine allows multiple clients to connect simultaneously, making the converter a local message-distribution node. This ensures interoperability between on-site devices and remote servers or cloud applications.

Triple connectivity: LAN + LTE SIM + eSIM

The G43-E version is built specifically for installations requiring communication redundancy or fully standalone remote connectivity. It supports:

• Ethernet LAN (RJ45) – primary wired communication,
• LTE via MicroSIM – mobile communication through a physical SIM card,
• eSIM module – integrated SIM for remote provisioning and operation without a physical card.

This communication trio provides:

• automatic failover options between LTE/eSIM and LAN,
• continuous operation in sites with limited network coverage,
• high reliability for critical infrastructure,
• ready-to-use connectivity for temporary or mobile installations.

The LTE modem supports an SMA Female antenna connector, enabling the use of high-gain external antennas in areas with weak cellular signal conditions. This enhances communication performance for remote industrial locations.

Configuration via SW67C03 software and integrated webserver

The device is configured using the SW67C03 configuration software, available at:
DOWNLOAD

Using SW67C03, the user can configure:

• all RS485 communication parameters,
• MQTT Broker settings including topics, QoS, payload structures and client sessions,
• LAN settings (IP, DNS, gateway, DHCP),
• LTE SIM and eSIM profiles,
• data routing and topic mapping,
• firmware upgrades and diagnostic tools.

The built-in webserver interface enhances convenience by offering:

• real-time communication monitoring,
• diagnostics and status reporting,
• network activity overview,
• basic log access,
• operational health checks.

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

The HD67C03-5-G43-E-B2 is engineered for long-term stability in industrial automation, energy systems, utility infrastructures and outdoor installations. Key hardware features include:

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

The mechanical design ensures resistance to vibration, electrical noise and temperature extremes, making the device suitable for demanding industrial applications and long-term field deployments.

Technical specifications

• Ports: 1× RS485, 1× Ethernet, SIM Card, eSIM
• RS485 protocol: differential serial bus
• MQTT Broker: full publish/subscribe support
• RS485 connector: 3-pin screw terminal block
• Network connectors: RJ45 + SIM + eSIM
• 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-E-B2

If you need assistance selecting the correct RS485 to MQTT Broker converter with LTE and eSIM connectivity, or if you want to verify compatibility with your existing infrastructure, our engineering staff is ready to support you.