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Welcome!
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!


 
Latest News
 
  • Atlanta SSPC Meeting Concludes! (10/17) Atlanta, GA. SSPC 135's fall meeting in Atlanta, Georgia, took place between October 23-26 at Georgia Tech. More details will follow shortly!
     
  • Four More Addenda Go Out for Public Review! (10/17) Atlanta, GA.
    • Proposed Addendum 135-2016be has begun its 3rd 45-day Publication Public Review which will run from October 20 to December 4, 2017. This addendum adds lighting specific BIBBs and device profiles.
       
    • Proposed Addendum 135-2016bi has begun its 4th 30-day Publication Public Review of Independent Substantive Changes which will run from October 20 to November 19, 2017. This addendum adds a new Audit Reporter object type and new audit notification services to report auditable actions. Addendum bi also changes the DeviceCommunicationControl Service for Audit Reporting and modifies Logging Objects to allow for Extremely Large Logs.
       
    • Proposed Addendum 135-2016bn has begun its 1st 45-day Publication Public Review which will run from October 20 to December 4, 2017.This addendum makes SCHED BIBBs consistent on supported datatypes and adds BOOLEAN; clarifies COV- and COVP-related BIBBs; and ensures Clock is required for support of AE-ACK-A.
       
    • Proposed Addendum 135-2016bq has also begun its 1st 45-day Publication Public Review which will run from October 20 to December 4, 2017. This addendum Adds Lockout enumeration to the Authentication_ Status of the Access Point object; Fixes the Absentee_Limit property of the Access Credential object type; Specifies authentication status when authorization mode is NONE; and Ensures that the denied or granted access event is generated last.

    Please click on the links above to see the addendum's content or visit www.ASHRAE.org to both get a copy and submit comments.

  • ASHRAE Announces Public Review of Addendum 2016bd. (8/17) Atlanta, GA. Proposed Addendum 135-2016bd has begun its 3rd publication public review which will run from August 18 to October 2, 2017. The addendum adds a new Staging Object Type which provides a way for BACnet devices to map analog values onto multiple Binary Value, Binary Output, or Binary Lighting Output objects.
     
  • ASHRAE Issues Vendor ID 1000! (7/17) Atlanta, GA. Vendor IDs (VIDs) have now hit the 1000 mark! On July 12 ASHRAE assigned Vendor ID 1000 to Ekon GmbH, located in Bruneck, South Tyrol, Italy. Remarkably, the pace of issuance continues to grow. While the original purpose of the Vendor ID was to provide a numerical value to distinguish vendor-specific extensions to the BACnet protocol, the VID has also become a general metric to gauge organizations' interest in exploring BACnet technology. ASHRAE began issuing VIDs with the publication of BACnet-1995, twenty-two years ago. Today VIDs belong to organizations in 49 countries. The SSPC wishes to thank all the organizations that have shown their interest in BACnet by obtaining a VID!
     
  • BACnet Committee Meets in Long Beach! (6/17) Long Beach, CA. SSPC 135 (a.k.a. the BACnet Committee) met over 5 days in June. The committee gathered for the summer meeting in Long Beach, CA, as part of the ASHRAE Annual Conference.

    Aside from work on pending addenda and proposals, important discussion points were:

    • The release to ASHRAE of Addendum 135-2016be (Lighting BIBBs and profiles) for a 3rd Public Review.
    • The release to ASHRAE of Addendum 135-2016bn (Miscellaneous BIBB Changes) for 1st Public Review.
    • The release to ASHRAE of Addendum 135-2016bq (Miscellaneous Access Control Changes) for 1st Public Review.
    • The release to ASHRAE of Addendum 135-2016bi (Audit Logging) for a 4th 30-day Public Review of Independent Substantive Changes.
    • Discussion of the future direction of Addendum 135-2016bj (BACnet/IT), and the proposed introduction of a new, security based datalink called "BACnet Secure Connect" or "BACnet/SC".
    • Continued discussion of future applications for CSML, including discussion of BIBBs.

    The SSPC wishes to thank its volunteers for their time and effort on the BACnet standard.
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  • BACnet Committee Meets in Ft. Lauderdale! (4/17) Plantation, FL. SSPC 135 (the BACnet Committee) met over 4 days in April. The committee gathered for its spring interim meeting, generously hosted again by the Lutron Experience Center in Plantation, Florida, just west of Fort Lauderdale. In addition to work on pending addenda and proposals, important discussion points included:
    • The release to ASHRAE of Addendum 135-2016bd (Staging Object Type) for a 3rd Publication Public Review.
    • The release to ASHRAE of Addendum 135-2016bl (Miscellaneous Changes) for publication.
    • Discussion of the future direction of Addendum 135-2016bj (BACnet/IT), based on public review comments.
    • Discussion of the future direction of Addendum 135-2016bb (MS/TP zero config), based on public review comments.
    • Continued discussion of semantic tagging methodologies as they pertain to non-English locales  and ontologies.
    • Continued discussion of future applications for CSML (the Control Systems Modeling Language defined in Annex Q).

    The SSPC wishes to thank its volunteers for their time and effort on the BACnet standard.  Special thanks also go to Lutron for providing the venue, in support of the committee, and their gracious hospitality throughout this meeting and meetings past!

  • Austrian Armed Services Confer on BACnet! (4/17) Salzburg, Austria. The Austrian Leadership Support and Cyber Defense Command and the Military Real Estate Management Center of the Austrian Armed Services recently concluded their third conference on "Building Automation with BACnet". Thirty-five experts from both Germany and Austria participated in the event held in the Salzburg Schwarzenberg barracks. Among the participants were representatives of the Deutsche Bundesbank (Germany's federal bank), the Technical Universities of Vienna and Graz, as well as a number of designers and manufacturers. Longtime BACneteer Hans Kranz moderated the event.

    While the first two conferences focused on "Interoperability in Building Automation" and "BACnet Guidelines for Multivendor Projects", this event focused on the "Integrated Design and Implementation Process" and hoped to clarify the relative scopes of the owner and his specifications; the designer's services; the project's execution; and the final handover to the owner. The role of possible computer support for each of these functions was also considered.

    Meeting leader Rupert Fritzenwallner of the Leadership Support and Cyber Defense Command thanked the participants for their commitment and contributions and expressed delight that the BACnet meetings of the Austrian Armed Services, as a platform for information exchange and transfer of BACnet knowledge, were being so positively received.

  • Two Addenda Released for Public Review! (4/17) Atlanta, GA. ASHRAE has just announced the start of 45-day public reviews of two addenda to the BACnet standard. Addendum 135-2016bi, Audit Reporting, is going out for its 3rd Publication Public Review of Independent Substantive Changes while Addendum 135-2016bp, Tweaks to BACnet Web Services, is going out for its first review. Click on the above links for details!
     
  • BACnet User Group New England to meet on March 30, 2017. (3/17)  The next meeting of the BACnet User Group New England will be on Thursday, March 30, 2017 in Needham, Massachusetts.  The speakers will be Gabriel Kirby from LG and Mike Leathem from PTC.  All are welcome to attend, but preregistration is required.  Visit www.bacnetusergroupne.com for details.
     
  • Strides Made Towards Higher-Level Semantics! (1/17) Las Vegas, NV. During its winter meeting in Las Vegas, the BACnet committee made substantial progress towards the application of semantic information in BACnet and the creation of a general standard tag dictionary for building automation and associated building systems, useful in a broad range of applications and protocols, including BACnet.

    The semantic tagging concept for BACnet was voted out for an initial Publication Public Review as draft Addendum 135-2016bo. This tagging concept is foreseen to be a new BACnet Annex and defines how semantic tags from various dictionaries are applied in BACnet objects and the abstract data model (BACnet XD).

    For interoperable use of semantic tags, well-defined and robust standardized tag dictionaries are a fundamental prerequisite. The creation of a new ASHRAE standard, "Designation and Classification of Semantic Tags for Building Data", was proposed by the BACnet committee and approved by the ASHRAE Standards Committee. The new standard will provide a dictionary of tags for building automation and associated systems and protocols and is envisioned to ultimately become an ISO standard. Tags from this dictionary will be usable for tagging of building data in databases, protocols, BIM data, and other applications. For practical reasons, the draft of this new proposed ASHRAE standard 223P will be created and brought through the public review process by the BACnet committee. The formation of a dedicated project committee for this new standard and its future continuation and maintenance will be considered.

    Also related to higher-level semantics, the Elevator and Life Safety Working Groups held a joint Occupant Evacuation Operation (OEO) summit to discuss BACnet-based standardized application interfaces between fire alarm systems (FAS) and elevator systems (ES), for the purpose of OEO. This meeting was attended not only by BACnet people, but also by representatives from the fire and elevator domain. OEO is a relatively new concept, in particular for high rise buildings, enabling the use of elevators for the fast and safe evacuation of building occupants in the case of a fire. Aside from specific elevator and building construction requirements, OEO demands that FASs be able to provide detailed information about fire and evacuation states of floors to the ES, and that some state indications be available for transfer from the ES to the FAS. BACnet is considered a suitable protocol for conveying this information. As a result of this meeting, further work is planned by the Elevator and Life Safety Working Groups to create an initial draft of the application interface specification. This is a type of pioneer work, even for BACnet, above and beyond BACnet objects and semantic tags.

    Aside from work on pending addenda and proposals, Addendum 135-2016bi, Audit Reporting, was approved for a 3rd Publication Public Review of Independent Substantive Changes (ISC). Only a few substantive changes were needed after the second review and these will be open for review. A new draft Addendum 135-2016bp was also ready for review and will be approved off-meeting for its initial Publication Public Review. This new addendum will fix a number of small issues found by implementers of the BACnet RESTful web services defined in Annex W of BACnet.

    The SSPC wishes to thank its volunteers for their time and effort on the BACnet standard.

  • Addendum-135-2016bj out for 1st APR! (12/16) Atlanta, GA. ASHRAE has announced the first Advisory Public Review of Addendum 135-2016bj from December 9, 2016 until February 7, 2017. This addendum extends the BACnet Architecture for Use of Internet Application Protocols; adds BACnet Virtual Router Link Half-Router; adds new Annex YY for the BACnet Virtual Router Link; adds new Annex ZZ, BACnet IT; adds and extends Object Types for BACnet/IT; adds and extends ASN.1 Types for BACnet/IT; introduces new Error Codes for BACnet/IT; and defines Interoperability Specification Extensions for BACnet/IT.

    To read a "white paper" written by the draft addendum's principal author and SSPC chairman Bernhard Isler, please click here.

    APRs are used to get informal public comments and guidance when a proposed addendum contains a significant amount of new material some of which may generate questions or controversy. They thus give the project committee an opportunity to resolve issues prior to publication review and thus help to expedite the standards development process.

    Please click on the link above to see the addendum's content or visit www.ASHRAE.org to both get a copy and submit comments.

Coming Events

  • November 7, 2017, BACnet User Group New England, Boston, MA The next meeting of the BACnet User Group New England will be on Tuesday, November 7, 2017 at Boston University in Boston, Massachusetts. Mike Newman and Jim Butler will give presentations, and a facility tour will be offered. All are welcome to attend, but preregistration is required. Visit www.bacnetusergroupne.com for details.
     
  • January 18-22, 2018, SSPC 135 Meeting, Chicago, IL.
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