What is BACnet?
BACnet (Building Automation and Control Networks) is an open communication protocol used in Building Management Systems (BMS) to allow devices from different manufacturers to communicate with each other.
It is one of the most widely used protocols in Smart Buildings, enabling interoperability between HVAC, lighting, energy, and life-safety systems.
What BACnet does
BACnet defines how building devices exchange information, including:
- Temperature, pressure, and sensor values
- Setpoints and control commands
- Equipment status and alarms
- Schedules and trends
- Device and network health data
Why BACnet exists
Before BACnet, building systems were typically closed and vendor-locked. BACnet was developed to provide a standard, vendor-neutral protocol that allows systems from different manufacturers to work together.
This interoperability is critical for modern buildings that combine multiple technologies, platforms, and lifecycle upgrades.
Common BACnet network types
- BACnet/IP – runs over standard Ethernet and IP networks
- BACnet MS/TP – serial communication over RS-485
- BACnet Ethernet – legacy Ethernet-based transport
Where BACnet is used
- Commercial offices
- Hospitals and healthcare estates
- Universities and campuses
- Data centres
- Retail and mixed-use developments
BMS platforms that use BACnet
Roles that work with BACnet
- BMS Engineers
- BMS Commissioning Engineers
- BMS Project Managers
- Smart Buildings Engineers
- Energy Optimisation Specialists
Why BACnet matters
BACnet is a foundational technology for Smart Buildings. It enables flexibility, reduces vendor lock-in, and allows buildings to evolve over time as technologies change.
As buildings become more connected and data-driven, BACnet remains a critical enabler of interoperability and long-term value.