Which standard is commonly used to enable interoperability among building automation devices?

Which standard is commonly used to enable interoperability among building automation devices?

• A. MODBUS
• B. HMI
• C. BACnet
• D. LAN

Answer: (C)

Interoperability across building automation devices relies on a common protocol and data model so devices from different vendors can communicate in a predictable way. BACnet is designed for this purpose, providing a defined set of object types (like sensors and actuators) and services that allow devices to discover each other, read and write properties, and coordinate actions. It supports multiple transport options, such as BACnet/IP and BACnet/MS/TP, and is established as an ANSI/ASHRAE and ISO standard, which helps ensure wide vendor support and cross-vendor compatibility. Other options don’t fit as well. MODBUS is a simpler fieldbus used in various industrial contexts and doesn’t offer the same universal object model and device discovery tailored to building systems. HMI refers to the human–machine interface, not a protocol for device interoperability. LAN is just a network type and does not define how devices communicate or interpret data.

Interoperability across building automation devices relies on a common protocol and data model so devices from different vendors can communicate in a predictable way. BACnet is designed for this purpose, providing a defined set of object types (like sensors and actuators) and services that allow devices to discover each other, read and write properties, and coordinate actions. It supports multiple transport options, such as BACnet/IP and BACnet/MS/TP, and is established as an ANSI/ASHRAE and ISO standard, which helps ensure wide vendor support and cross-vendor compatibility.

Other options don’t fit as well. MODBUS is a simpler fieldbus used in various industrial contexts and doesn’t offer the same universal object model and device discovery tailored to building systems. HMI refers to the human–machine interface, not a protocol for device interoperability. LAN is just a network type and does not define how devices communicate or interpret data.