Official Website of ASHRAE SSPC 135
This Website is dedicated to providing the latest information on BACnet - A
Data Communication Protocol for Building Automation and Control Networks.
Developed under the auspices of the American Society of Heating, Refrigerating
and Air-Conditioning Engineers (ASHRAE), BACnet is an American national standard,
a European standard, a national standard in more than 30 countries, and an ISO
global standard. The protocol is supported and maintained by ASHRAE Standing
Standard Project Committee 135 whose members have created and provided the
content for this Website.
Here you will find the latest BACnet news, the status of SSPC 135
activities, a comprehensive bibliography of BACnet publications - many of
which are available on-line - along with a wealth of other information. In
keeping with ASHRAE's long-standing tradition and policy of non-commercialism,
this site contains no advertising. However, BACnet's success depends on the
implementation of BACnet in commercial products. Thus, we are pleased to
offer links to the Websites of manufacturers who are supporting BACnet
through their product offerings.
The SSPC welcomes your comments and suggestions concerning this site!
- Big steps into IT environments and IoT! (7/16) St. Louis MO.
The long anticipated BACnet/IT additions to the BACnet standard have been released for
advisory public review (APR) as Addendum 135-2016bj. An advisory public review is a
mechanism utilized by ASHRAE committees as a way to obtain market feedback and increased
public scrutiny of the proposed material. BACnet/IT will enable BACnet to live in
modern and managed IT infrastructures and applying IT security concepts in a way well
known and accepted in such environments. In parallel to the public review, the committee
is planning for an online plugfest to spark independent implementations for verification
of the concepts. Details on this plugfest will be announced with the addendum going out
for public review.
Other items completed during the St. Louis meetings were: Addendum 135-2016be, Lighting
BIBBs and Device Profiles, was released for 2nd publication public review; Addendum
135-2016bi, Audit Reporting, was also approved for its 2nd publication public review;
and, the Data Modeling Working Group (DM-WG) discussed ideas for promoting BACnet/WS
and how to use it with other protocols.
The SSPC wishes to thank the volunteers for their time and effort on the BACnet standard.
- St. Louis Meeting Details Announced! (6/16) Zug, Switzerland.
SSPC Chairman Bernhard Isler has published the details of the upcoming meeting in St.
Louis. Click here
for the information.
- Three New Addenda Published! (5/16) Atlanta, GA.
The standard addenda listed below are now available for free download. These addenda make
up protocol Revision 19 of the BACnet standard and are the last addenda to Standard
135-2012. They will be an integral part of the upcoming consolidated BACnet Standard
135-2016, soon to be published.
- Addendum 135-2012am
Extend BACnet/WS with RESTful web services for complex data types and subscriptions,
extract the data model from Annex Q into a separate common model, rework of Annex Q
to be an XML syntax for the common model, add a JSON syntax for the common model,
deprecate Annex N SOAP services and add a migration guide, and change Clause 21
identifiers to use a consistent format.
- Addendum 135-2012ba
Add CSML based descriptions of BACnet devices, add Semantic Tags to all objects,
extend Structured View object to contain semantic information on subordinates, and
add data revisioning capabilities to CSML.
- Addendum 135-2012bc
Extend BIBBs for Primitive Value objects, add new BIBBs for event enrollment and
subscription, amend B-AWS related BIBBs for revised event reporting, add life safety
BIBBs and device profiles, add physical access control BIBBs and device profiles, and
add an All-Domain Advanced Workstation (B-XAWS) device profile.
- Five New Addenda Published! (3/16) Atlanta, GA. The standard addenda listed
below are now available for free download here or on the ASHRAE website at:
- Addendum 135-2012aj
Add support for IPv6
- Addendum 135-2012aq
Elevator object types
- Addendum 135-2012bf
Advanced Network Configuration with the Network Port object
- Addendum 135-2012bg
Add engineering units, harmonize message text handling for all alarm services, ensure
Alert Enrollment objects do not send notifications which require acknowledgment,
allow selection of the Nth last day of the month in a BACnetWeekNDay, remove initiation
of GetEnrollmentSummary from AE-AS-A, ensure UTC_Offset is configurable, clarify
ReadRange service, clarify the effect of changing Buffer_Size, stop MS/TP nodes from
sending POLL_FOR_MASTER frames to themselves, improve the Clause 12 preamble, fix the
Notification_Class property of the Notification Class object.
- Addendum 135-2012bh
Correct Application State Machine Failover, increase Segmentation Window Size for
- SSPC 135 Concludes Productive Orlando Meeting (1/16) Zug, Switzerland. The BACnet committee assembled for another 4 1/2 days of working group and plenary meetings in Orlando, FL, in the course of the ASHRAE Winter Meeting and AHR Expo 2016. While the working groups were focusing on new work items and the resolution of public review comments, the plenary voted out comment responses to several major addenda. The resolution of comment responses resulted in editorial changes only. As a result, the following addenda are now on their way to being published:
- Addendum 135-2012am defines new RESTful Web Services replacing the current Web Services that are based on SOAP. In addition, this addendum introduces the so-called BACnet Extended Data Model, also known as BACnet XD. These extensions allow for arbitrary structures, a uniform set of standardized metadata applicable to all data, a powerful mechanism for data relations, and a semantic information model.
- Addendum 135-2012ba adds device descriptions based on BACnet XD using CSML as the language, and adds extended semantic information to objects and to relations in structures of objects.
- Addendum 135-2012bc includes general BIBB updates for primitive value objects and the revised event reporting. It also includes new BIBBs and device profiles for both life safety and physical access control devices and applications. The new device profiles are added to the standard as new families, utilizing the device profile family concept introduced with Addendum 135-2012al, Protocol Revision 17.
The above three addenda will make up Protocol Revision 19. The committee decided that they are to be published as addenda to the BACnet standard 135-2012. With that, they will flow into the projected new baseline 135-2016 of the BACnet standard, expected to be publicly available this spring.
For BACnet, the RESTful Web Services Addendum 135-2012am is a major step towards support of modern IT technologies and integration with enterprise level applications, clouds, and modern user interfaces. Together with Addendum 135-2012ba, a higher level of semantic information can be provided that is consumable by machines, reducing costly manual engineering hours. On the completion of these two addenda, the committee specifically thanked and applauded former SSPC Chairman Dave Robin from Automated Logic who, as the major author of these addenda, spent an uncountable number of days and nights making possible this big achievement for the BACnet community.
- SSPC 135 Wraps up Atlanta Meetings! (11/15) Atlanta, GA.The BACnet committee met in Atlanta, Georgia, November 2-6, once again graciously hosted by Georgia Tech.
Highlights from the meeting include the following:
- Addendum 135-2012aj, that adds support for IPv6, was recommended for publication.
- Addendum 135-2012bf, that added extensions to the Network Port Object and adds clarifying text to Annex J, was recommended for publication.
- Addendum 135-2012bg, that makes several miscellaneous changes throughout the standard, was recommended for publication.
- The committee reviewed the proposal for adding audit logging and recommended it for publication public review as Addendum 135-2012bi.
The SSPC thanks the committee volunteers for their attendance and ongoing hard work!
- Three More Addenda Begin 60-day Public Review (10/15) Atlanta, GA. The following addenda have started their 60-day Publication Public Reviews which will run from October 20 until December 29, 2015:
3rd Public Review of Addendum 135-2012am
This addendum extends BACnet/WS with RESTful services for complex data types and subscriptions, extracts the data model from Annex Q into a separate common model, reworks Annex Q to be an XML syntax for the common model, adds a JSON syntax for the common model, deprecates Annex N SOAP services and adds a migration guide.
4th Public Review of Addendum 135-2012ba
This addendum adds CSML Descriptions into BACnet Devices, adds Semantic Tags to All Objects, extends Structured View Objects to Contain Semantic Information, changes Clause 21 identifiers to use a consistent format, and adds Data Revisioning Capabilities to CSML.
2nd Public Review of Addendum 135-2012bc
This addendum extends BIBBs for Primitive Value Objects; adds new BIBBs for Event Enrollment and Subscription; amends B-AWS related BIBBs for revised event reporting; and adds Life Safety BIBBs and Device Profiles, Access Control BIBBs and Device Profiles, and an All-Domain Advanced Workstation
Click on the links above to see addenda content or visit www.ASHRAE.org to both get copies and submit comments.
- Five Addenda Now Available for Public Review (8/15) Atlanta, GA. One of the main results of the April SSPC meeting in Ft. Lauderdale was the recommendation of five addenda for Publication Public Review (PPR).
Recommended for a 5th PPR of Independent Substantive Changes was:
The following four addenda are each undergoing their 1st PPR:
Click on the links above to see addenda content and dates of the PPRs or visit www.ASHRAE.org to both get copies and submit comments.
Addendum 135-2012bg; and
- SSPC Wraps up Atlanta Meetings! (7/15) Atlanta, GA.The BACnet committee met in Atlanta, Georgia at the end of June in conjunction with the ASHRAE Annual Meeting. Highlights from the meeting include the following:
The various working groups met and continued making good progress on the respective work items. Highlights of the working group meetings include:
- Continued work on test development across the board.
- Continued work on Data Modeling and the proposed direction for IT interaction.
- The Application Profiles Working Group continues to work with Project Haystack to ensure that the proposed tagging solutions are compatible.
The plenary met for two days and recommended 3 addenda for public review: Addendum 135-2012bc was recommended for a 2nd Publication Public Review; Addendum 135-2012ba was recommended for a 4th Publication Public Review; and, Addendum 135-2012am was recommended for a 3rd Publication Public Review.
This meeting marked Carl Neilsonís last meeting as the Chair of the SSPC and subsequent appointment of new Committee officers. Bernhard Isler will be assuming the role of Chair after having served as Secretary for 3 years and Vice-Chair for 3 years; Michael Osborne will be assuming the role of Vice-Chair having served as Secretary for 3 years, and, Coleman Brumley will be assuming the role of Secretary.
The Committee thanks Carl for all of his hard work!
Bernhard Isler becomes the 6th Chairman of the BACnet Committee since its inception in 1987.
Pictured from left to right: Carl Neilson, Chair 2012-2015; Dave Robin, Chair 2008-2012; Bernhard Isler, Incoming Chair; Steve Bushby, Chair 2000-2004; and, Mike Newman, Chair 1987-2000. Absent is Bill Swan, Chair 2004-2008. Bill passed away in 2011.
- Fourth Swan Award Presented to Coleman Brumley! (7/15) Atlanta, GA. During the June 27 plenary session of SSPC 135, David Fisher, President of PolarSoft Inc., announced the recipient of the fourth annual "Swan Award." Fisher reiterated the purpose of the award:
"This award, which is presented yearly, honors the memory of our dear friend and colleague, Bill Swan, a.k.a. BACnet Bill, who passed away in 2011. We want to remember him always not only for his substantial dedication and contributions to BACnet, but also as a good and honest man, devoted to his family and faith. This award carries on Bill's example of even-handedness, rational and considerate discussion, and a focus on how to make the standard better for everyone. The award honors those individuals who through their actions demonstrate the qualities of integrity, selflessness, camaraderie and fierce dedication to the standard that we admired in Bill."
Fisher explained that this year's selection was based on several criteria about the recipient:
- Authored parts of the standard
- Served as a Working Group convener
- Was an implementer/product designer
- Has provided education to others about BACnet
- Has worked on behalf of BACnet with other groups, such as BACnet International
- Has shared knowledge and experience with others through public forums such as LinkedIn and BACnet-L
Fisher then presented the 2015 Swan Award to SSPC incoming secretary Coleman Brumley.
"It is our intent to continue to sponsor these awards in the future," explained Fisher, also noting that he continues to encourage other organizations within the BACnet sphere who are interested in sharing sponsorship to contact him directly.
- June 23-27, 2016, SSPC Meeting, St. Louis, MO
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