HD67C04-5-B2 Modbus Master and MQTT Broker – Industrial Protocol Converter

HD67C04-5-B2 Modbus Master and MQTT Broker – Industrial Protocol Converter.

The HD67C04-5-B2 is a compact industrial protocol converter designed to seamlessly integrate traditional automation networks based on Modbus RTU with modern MQTT applications and IoT platforms. The device operates simultaneously as a Modbus Master and an embedded MQTT Broker, enabling efficient data acquisition from field devices and secure distribution to cloud systems, SCADA platforms and remote monitoring applications.

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

Built in a durable housing type B, the converter is engineered for industrial environments and offers reliable operation across a wide temperature range from -40°C to +85°C. Its DIN rail mounting and terminal block connectors make it easy to integrate into control cabinets and automation systems.

Key Features and Benefits

• Modbus Master support for RS485 field devices.
• Embedded MQTT Broker for local publish/subscribe communication.
• Ethernet RJ45 port for MQTT communication and device configuration.
• Advanced data mapping between Modbus registers and MQTT topics.
• Industrial-grade design for harsh conditions from -40°C to +85°C.
• Flexible power supply with AC/DC input from 8…24 V AC or 12…35 V DC.
• DIN rail mounting for quick and secure installation.

How the HD67C04-5-B2 Works

As a Modbus Master, the device polls data from Modbus RTU devices connected via RS485, such as meters, HVAC controllers, sensors and PLC modules. All collected values can be instantly distributed through the integrated MQTT Broker, enabling real-time data availability for IoT applications, dashboards, cloud services and SCADA systems.

The converter allows defining MQTT topic structures, payload formats, update intervals, QoS levels and custom mappings, ensuring maximum flexibility for both small installations and large industrial networks.

Ports and Connectivity

• 1× Modbus Master (RS485) – 3-way 5 mm terminal block.
• 1× Ethernet RJ45 – 10/100 Base-T autosensing.
• Power connector – 2-way terminal block (AC/DC).

Technical Specifications

• Modbus Master: 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-B2

Applications

• Modbus RTU integration with IoT platforms.
• Industrial and energy monitoring systems.
• Building automation and BMS communication.
• SCADA applications requiring MQTT connectivity.
• Sensors and analyzers connected to MQTT dashboards.

Technical Support

Consteel Electronics provides full support for Modbus configuration, MQTT topic mapping, payload formatting and integrating the converter into your automation system. We can prepare a ready-to-use configuration tailored to your project requirements.