HD67671-MSTP-4-A1 converter BACnet MSTP slave to RS-485 Modbus master for BMS and automation

Industrial BACnet MSTP slave to RS-485 Modbus master converter, housing type A (slim), DIN rail mount.

HD67671 allows you to connect a BACnet Master (for example a Supervisory System, etc) with some Modbus slaves. Converter is easy to configure thanks to free SW67671 software. This makes it an ideal solution for Building Management Systems (BMS) and Industrial Automation Systems (IAS), where seamless communication between heterogeneous protocols is critical. By supporting bi-directional data exchange, the device ensures that BACnet controllers can both read and write information to Modbus field devices such as sensors, meters, or actuators. Thanks to its slim DIN rail housing, it can be installed even in compact panels, offering high reliability in environments with limited space.

Configuration:

Thanks to the SW67671 software on your PC you can:

• Define the parameters of BACnet line
• Define the parameters of Modbus line
• Define BACnet objects that contains the data read from the Modbus slaves
• Define BACnet objects that contains the data to send to the Modbus slaves
• Update the device

The SW67671 configuration tool provides an intuitive interface for mapping Modbus registers into BACnet objects and vice versa. This simplifies commissioning, reduces engineering time and minimizes the risk of configuration errors. The software also enables firmware updates directly from a PC, ensuring long-term support and adaptation to evolving project requirements. This functionality is particularly important for integrators handling large-scale deployments where up to 2000 BACnet objects may need to be defined.

Characteristics:

• Up to 2000 BACnet objects (Read+Write)
• Triple isolation between BACnet - Power Supply, BACnet - Modbus, Power Supply - Modbus
• Bi-directional information exchange between BACnet bus and Modbus bus
• Mountable on 35mm Rail DIN

In addition to its technical capacity, the HD67671 ensures system safety through galvanic isolation, which protects equipment from ground loops and electromagnetic disturbances. Its wide operating temperature range (-40°C to +85°C) makes it suitable for both indoor and outdoor applications, from control cabinets in industrial plants to building automation panels in commercial facilities. The converter’s robust design, combined with a lightweight 200 g housing, guarantees durability even in demanding conditions.

Specifications:

• Ports: 2x RS-485; 1x Ethernet (programmable port)
• Serial protocol: Modbus Master
• BACnet protocol: BACnet MSTP Slave
• Data Rates Serials: Up to 115200 bps
• Data Rates BACnet: Up to 115200 bps
• Serials connector: 3way 5mm removable screw terminal
• BACnet connector: 3way 5mm removable screw terminal
• Power supply: 8 ~ 24VAC; 12 ~ 35VDC
• Power supply connector: 2way 5mm terminal block
• Operating temperature: -40°C to +85°C (-40°F to +185°F)
• Dimensions: 120 mm x 23 mm x 107 mm (DxWxH)
• Weight: 200g approx
• Mechanical fixing: 35mm DIN Rail mount
• Software: SW67671
• ORDER CODE: HD67671-MSTP-4-A1

The combination of dual RS-485 ports and an Ethernet port offers flexibility in deployment, enabling both traditional serial networks and modern hybrid architectures. Support for Modbus Master and BACnet MSTP Slave protocols ensures compatibility with a wide range of PLCs, SCADA systems and building controllers. This versatility makes the device a universal bridge for automation engineers, helping unify Modbus-based field devices with BACnet supervisory systems without complex custom coding.

Configurator – Software SW67671 FREE DOWNLOAD

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