BACnet™--the ASHRAE Building Automation and Control Networking Protocol
The BACnet protocol provides mechanisms by which computerized
equipment of arbitrary
function may exchange information, regardless of
the particular building service it performs. As a result, the BACnet
protocol may be used by mobile and cloud-hosted devices, head-end
computers, general-purpose direct digital controllers, and
application-specific or unitary controllers with equal effect.
This protocol provides a comprehensive set of messages for conveying encoded building automation data between devices including, but not limited to
(a) hardware binary input and output values,
(b) hardware analog input and output values,
(c) software data values,
(d) schedule information,
(e) alarm and event information,
(f) trend and event logs,
(g) files,
(h) control logic,
(i) application specific data for a large range of building services, and
(j) network configuration including security.
The 2020 edition of Standard 135
includes many new capabilities and several clarifications. New
capabilities include lighting and elevator device profiles that provide a
standardized description for these types of devices, along with audit
reporting and logging to capture auditable actions. BACnet Secure
Connect, a BACnet data link layer, was also added. This datalink is fully
compatible with all existing BACnet data links and provides
aninteroperable secure path for BACnet communications.
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