NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
BACnet is a communication protocol for Building Automation and Control networks that has been developed by ASHRAE Standards Project Committee (SPC) 135P. The committee has been working on the standard since the middle of 1987 and published a draft version for public review in August, 1991. As a result of the public review (which generated 507 formal comments), numerous substantive changes have been made to the proposed standard. Included are changes in object type definitions, application layer services, and the network layer, MS/TP and Point-to-Point protocols. Before describing these changes and why they were made, a brief overview of BACnet would be helpful.
communication protocol, energy management and control systems
Citation
Bushby, S.
and Newman, H.
(1994),
BACnet: A Technical Update., ASHRAE Journal, , -1, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=916758
(Accessed October 10, 2025)