Daikin DMS502B51 D-BACS Interface for BACnet

Product Parameters

• Model Number: DMS502B51
• Manufacturer: Daikin Industries, Ltd.
• Interface Type: D-BACS (BACnet over IP)
• Standard Compliance: ASHRAE / ANSI / ISO 16484-5 (BACnet)
• Max Connectable Indoor Units: Up to 256 units (via 4 DIII-Net ports)
• Power Supply: 100 – 240 Vac, 50/60 Hz
• Communication Port: 10BASE-T/100BASE-TX Ethernet Port
• DIII-Net Ports: 4 separate lines (64 units per line)

Product Description The DMS502B51 is a high-performance gateway interface designed to integrate Daikin VRV and SkyAir air conditioning systems into a Building Management System (BMS) via the BACnet protocol. This interface acts as a translator, converting Daikin’s proprietary DIII-Net communication into standardized BACnet objects. It allows facility managers to monitor and control indoor unit status, temperature setpoints, operation modes, and error codes from a centralized BACnet-compatible workstation.

Product Applications This interface is primarily used in large-scale commercial buildings, such as office towers, hotels, hospitals, and educational institutions, that utilize centralized building automation. It is essential for projects requiring seamless interoperability between HVAC systems and other building services (lighting, security, fire safety) under a single management platform. It facilitates energy management and sophisticated climate control strategies across extensive VRV networks.

Product Specifications

• Weight: 1.80 kg
• Dimensions: 26.0 cm x 19.0 cm x 6.5 cm
• Country of Origin: Japan
• Mounting: Wall mount or Control Panel mount

Operational Precautions

• Network Configuration: Ensure the IP address, Subnet Mask, and Gateway are correctly assigned through the Daikin configuration tool before connecting to the main building network.
• Wiring Polarity: Maintain strict adherence to DIII-Net wiring standards (F1/F2 lines) to avoid communication timeouts or data corruption across the indoor unit network.
• Ambient Environment: The unit should be installed in an indoor environment free from corrosive gases and excessive moisture, ideally within a temperature-controlled electrical room.
• Address Conflicts: Verify that each indoor unit has a unique DIII-Net address to prevent address duplication errors when the interface polls the network.

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