Thread: Bacnet protocol

BACnet, stands for Building Automation Control Network, is the standard digital communication protocol for the HVAC control industry. Previous to the execution of BACnet, each manufacturer had its own driver and need its own proprietary host to administer its systems.

History

While software give a stopgap measure for managing dissimilar automation systems, engineers believed a uniform communication protocol ensured the most efficient interoperability. The starts of DDC (Direct Digital Control) systems also group the want for a unified protocol.

DDC

DDC devices will typically operate within a control loop. A basic direct digital control loop would measure data (sensor), calculate the data and take some form of action as a result. Without the BACnet protocol, a sensor from one company could not or would not talk to a control board from another.

Benefits

Besides permitting administration from a single host, customers could now buy systems from many different manufactures. This raised competition, lowered price and most probably inspired innovation. As a byproduct of standardization, DDC systems could be used in ways that had been previously unimagined.

Specification

BACnet protocol specifies all objects and services required for a building control system, as well as but not limited to schedule, feedback loops, analog and binary input and outputs, values and the detection of new devices. It also state data link and physical layers.

Example Systems

Fire control systems, elevators, HVAC systems, lights and security systems are all covered by the BACnet protocol and have suitable services and objects relating to their function.