BACnet (Building Automation and Control Network) is a communication protocol created to allow automation and control products to communicate with each other in commercial buildings.
BACnet was specifically designed to be able to integrate applications from different vendors in the same system.
This protocol allows these products to communicate over Ethernet, ARCNet, Master-Slave/Token-Passing, and LonWorks.
BACnet is an open standard maintained by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).
It is commonly used for controlling building functions such as air handling systems, security, fire and life safety, lighting, and energy management.