HD67712-MSTP-2-A1 BACnet MSTP master to RS-232 Modbus slave converter for BMS

Industrial BACnet MSTP master to RS-232 Modbus slave converter, housing type A (slim), DIN rail mount.

HD67712 is a BACnet Master / Modbus Slave Converter and it allows you to connect some BACnet slaves with a Modbus Master (for example a PLC, HMI). Converter is easy to configure thanks to free SW67712 software. The device acts as a BACnet MSTP master and as a RS-232 Modbus slave, providing a seamless bridge between BACnet-controlled field devices and Modbus-based supervisory controllers. This makes it particularly valuable in Building Management Systems (BMS) and industrial automation, where the need to combine BACnet devices with existing Modbus infrastructure is common. The slim housing type A with DIN rail mounting allows easy installation even in compact control cabinets.

Configuration:

Thanks to the SW67712 software on your PC you can:

• Define the parameters of BACnet line
• Define the parameters of Modbus line
• Define the BACnet data that the converter reads/writes
• Update the device

The SW67712 configuration tool makes it possible to quickly define BACnet objects that represent values available to a RS-232 Modbus slave. This allows a BACnet MSTP master to manage and monitor its slaves, while at the same time providing structured access to Modbus masters such as PLCs or HMIs. The software also enables firmware updates and diagnostic functions, helping integrators ensure long-term stability and compliance with evolving standards. Thanks to the intuitive graphical interface, even complex mappings between networks can be created without deep programming knowledge.

Characteristics:

• Up to 512 BACnet objects in reading and 512 objects in writing
• Triple isolation between Serial - Power Supply, Serial - Ethernet, Ethernet - Power Supply
• Bi-directional information exchange between Modbus bus and BACnet bus
• Mountable on 35mm Rail DIN

The support for up to 1024 BACnet objects (512 read + 512 write) makes the HD67712 suitable for complex installations with many field devices. Its triple galvanic isolation enhances protection, ensuring that disturbances or ground loops do not propagate between BACnet, Modbus and the power supply. This feature is crucial for industrial environments where electromagnetic interference is common. With compact dimensions and low weight (approx. 200 g), the device fits easily into existing panels and can operate reliably across a wide temperature range from -40°C to +85°C.

Specifications:

• Ports: 1x RS-485; 1x RS-232; 1x Ethernet (programmable port)
• Serial protocol: RS-232 Modbus slave
• BACnet protocol: BACnet MSTP master
• Data Rates Serials: Up to 115200 bps
• Data Rates BACnet: Up to 115200 bps
• Serials connector: D-sub connector, type DE-9 Male
• 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: SW67712
• ORDER CODE: HD67712-MSTP-2-A1

The use of both RS-485 and RS-232 serial ports alongside a programmable Ethernet port provides flexibility during deployment. The BACnet MSTP master side ensures that supervisory controllers can coordinate large networks of BACnet devices, while the RS-232 Modbus slave interface ensures compatibility with legacy Modbus systems. This versatility makes the HD67712 an essential tool for system integrators tasked with combining new BACnet infrastructures with existing Modbus installations.

Configurator – Software SW67712 FREE DOWNLOAD