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BACnet Standard

ANSI/ASHRAE Standard 135-2016

BACnet™ - A Data Communication Protocol for Building Automation and Control Networks


The BACnet standard was initially developed and is now maintained by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). In ASHRAE, the Standing Standard Project Committee (SSPC) 135, a.k.a. the BACnet Committee, is responsible for the continuous maintenance and evolution of the BACnet standard. ASHRAE is an ANSI-Accredited Standards Developer for American National Standards, so the ANSI essential requirements are mandatory for this process, including public reviews.


BACnet is designed by ASHRAE to meet the communication needs of building automation and control systems for applications such as heating, ventilating, and air-conditioning control; fire and other life safety and security systems; energy management; lighting control; physical access control; and elevator monitoring systems. 


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.


BACnet International complements the work of the BACnet committee and BACnet-related interest groups around the world by facilitating the successful use of the BACnet protocol in building automation and control systems through interoperability testing, educational programs and promotional activities.


BACnet is an American National Standard, a European standard, a national standard in many countries, and global ISO Standard 16484-5:2017.


Copies of the BACnet Standard can be purchased from ASHRAE on its website.



ANSI/ASHRAE Standard 135.1-2013

Method of Test for Conformance to BACnet®


This companion standard to the BACnet standard, a.k.a. the BACnet Test Standard, was developed for defining the method of test for conformance to BACnet, and is now also maintained and evolved by the BACnet Committee, following the same ANSI rules as for the BACnet standard.


The BACnet test standard provides a set of procedures for verifying the correct implementation of each capability claimed on a BACnet PICS, including support of each claimed BACnet service, either as an initiator, executor, or both; support of each claimed BACnet object type, including both required properties and each claimed optional property; support of the BACnet network layer protocol; support of each claimed data link option; and support of all claimed special functionality.


BACnet International supports conformance and interoperability of BACnet implementations through its BACnet Testing Laboratories (BTL) organization. The BTL Working Group (BTL-WG) embraces both the BACnet test standard and field experience to define the set of tests applicable for BACnet products to achieve the BTL mark, listing, and certification.


As with BACnet, the companion BACnet test standard is also an American National Standard, a European standard, a national standard in many countries, and global ISO Standard 16484-6:2014.


Copies of the BACnet Test Standard can be purchased from ASHRAE on its website.



The BACnet Committee website maintains a current collection of addenda, errata and interpretations to both standards.



Report on BACnet Global Market Share

BACnet International commissioned a market research report in 2018 which was conducted by BSRIA and titled "Market Penetration of Communications Protocols." The study indicated BACnet's global market share continued to rise over the last five years and now exceeds 60%. The five year outlook projects continued growth in BACnet adoption with continual improvements to the standard and its integration with technologies, such as IPv6 and web services.

Click here to view the report








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