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BACnet Logo Official Web Site of ASHRAE SSPC 135
ADDENDA AND COMPANION STANDARDS
 

The experiences of users and implementers of BACnet have led to many constructive suggestions for improving the original standard, ANSI/ASHRAE 135-1995 and, more recently, its successors, ANSI/ASHRAE 135-2001, 135-2004, 135-2008, 135-2010, and 135-2012. The same can also be said about ANSI/ASHRAE 135.1-2003, the companion standard for BACnet conformance testing, and its subsequent updates in 2007, 2009 and 2011. The files available below are in Adobe Portable Document Format (PDF). Anyone wishing to comment on public review drafts during the listed comment period can get the necessary forms and instructions on the ASHRAE Website.

This Page was Last Updated on September 26, 2014 and is believed to be current as of that date.

BACnet Protocol Version and Revision Numbers

With the publication of Addenda 135-2012az on July 3, 2014, the following apply:

Version Number= 1
Revision Number= 16

Click on these links to jump to the addenda for a particular version:

135-2012 (BACnet-2012, Ver. 1, Rev. 14)
135-2010 (BACnet-2010, Ver. 1, Rev. 12)
135-2008 (BACnet-2008, Ver. 1, Rev. 7)
135-2004 (BACnet-2004, Ver. 1, Rev. 4)
135-2001 (BACnet-2001, Ver. 1, Rev. 2)
135-1995 (BACnet-1995, Ver. 1, Rev. Not Applicable)
 
135.1-2011
135.1-2009
135.1-2007
135.1-2003
 
Addenda to BACnet-2012

Note: Many of the addenda to BACnet-2012 were begun during the "lifetime" of BACnet-2010 or BACnet-2008 but their development and final public reviews were not completed in time to be incorporated into BACnet-2012. Therefore, some of the files for earlier drafts contain the string "2010" or "2008" in their titles even though they pertain to revisions to BACnet that will eventually be applied to BACnet-2012 or, possibly, subsequent consolidated versions of the standard.

  • Addendum 135-2012ai (This addendum is undergoing its 5th 45-day Publication Public Review from July 11 to August 25, 2014.)
     
    1. Add Network Port Object Type
    2. Changes to Annex J for the Network Port Object
    3. Changes to 135-2012al for the Network Port Object

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2008ai.
    Here is the link to the 2nd Publication Public Review Draft of Addendum 135-2010ai.
    Here is the link to the 3rd Publication Public Review Draft of Addendum 135-2010ai.
    Here is the link to the 4th Publication Public Review Draft of Addendum 135-2010ai.

  • Addendum 135-2012aj (This addendum underwent its 3rd 45-day Publication Public Review from March 7 to April 21, 2014.)
     
    1. Add support for IPv6
    2. Add an additional method for VMAC determination

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2008aj.
    Here is the link to the 2nd Advisory Public Review Draft of Addendum 135-2010aj.

  • Addendum 135-2012al (This addendum underwent its 4th 45-day Publication Public Review from March 8 to April 29, 2013.)
     
    1. Specify Best Practices for Gateway Design
    2. Add new BIBBS and Devices Profiles

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2008al.
    Here is the link to the 2nd Publication Public Review Draft of Addendum 135-2010al.
    Here is the link to the 3rd Publication Public Review Draft of Addendum 135-2010al.

  • Addendum 135-2012am (This addendum is undergoing its 1st 60-day Publication Public Review from April 11 to June 10, 2014.)
     
    1. Extend BACnet/WS with RESTful services for complex data types and subscriptions
    2. Extract data model from Annex Q into separate common model
    3. Rework Annex Q to be an XML syntax for the common model
    4. Add a JSON syntax for the common model
    5. Replace Annex N SOAP services with a migration guide
    6. Change Clause 21 identifiers to use a consistent format

    Here is the link to the 1st Advisory Public Review Draft of Addendum 135-2010am.

  • Addendum 135-2012an (This addendum is final and was approved by the ASHRAE Standards Committee on June 28, 2014; by the ASHRAE Board of Directors on July 2, 2014; and by the American National Standards Institute on July 3, 2014.)
     
    1. Add Extended Length MS/TP Frames
    2. Add Procedure for Determining Maximum Conveyable APDU

  • Addendum 135-2012ap (This addendum underwent its 1st 45-day Advisory Public Review from March 23 to May 7, 2012.)
     
    1. Define Application Interfaces
    2. Enhance Structured View Object
    3. Add New Service ReadPropertyIndirect
    4. Define Machine-Readable Definitions for Application Interfaces

  • Addendum 135-2012aq (This addendum is undergoing its 3rd 45-day Publication Public Review from July 11 to August 25, 2014.)
     
    1. Add Elevator Object Types
    2. Add COV Property Multiple Services
    3. Add a New Fault Algorithm FAULT_LISTED

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2010aq.
    Here is the link to the 2nd Publication Public Review Draft of Addendum 135-2010aq.

  • Addendum 135-2012ar (This addendum is final and was approved by the ASHRAE Standards Committee on January 26, 2013; by the ASHRAE Board of Directors on January 30, 2013; and by the American National Standards Institute on January 30, 2013.)
     
    1. Add New Engineering Units
    2. Clarify Coercion Requirements
    3. Specify SubscribeCOVProperty Error Codes
    4. Add Slave Proxy BIBBs
    5. Allow Unicast I-Have messages
    6. Require Both Time Sync Services for Time Masters

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2010ar.

  • Addendum 135-2012as (This addendum is undergoing its 2nd 45-day Publication Public Review from July 11 to August 25, 2014.)
     
    1. Add Value Source Information

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2010as.

  • Addendum 135-2012at (This addendum is final and was approved by the ASHRAE Standards Committee on June 28, 2014; by the ASHRAE Board of Directors on July 2, 2014; and by the American National Standards Institute on July 3, 2014.)
     
    1. Add Interface_Value Property

  • Addendum 135-2012au (This addendum is final and was approved by the ASHRAE Standards Committee on June 28, 2014; by the ASHRAE Board of Directors on July 2, 2014; and by the American National Standards Institute on July 3, 2014.)
     
    1. Clarify Authentication Factor Value Encoding Rules
    2. Clarify Coercion Support Requirements

  • Addendum 135-2012av (This addendum is final and was approved by the ASHRAE Standards Committee on June 28, 2014; by the ASHRAE Board of Directors on July 2, 2014; and by the American National Standards Institute on July 3, 2014.)
     
    1. Deprecate Execution of GetAlarmSummary
    2. Deprecate Execution of GetEnrollmentSummary

  • Addendum 135-2012aw (This addendum is final and was approved by the ASHRAE Standards Committee on June 28, 2014; by the ASHRAE Board of Directors on July 2, 2014; and by the American National Standards Institute on July 3, 2014.)
     
    1. Extend the CHANGE_OF_STATE Event Algorithm for All Discrete Types
    2. Add a New Event Algorithm CHANGE_OF_DISCRETE_VALUE
    3. Add a New Fault Algorithm FAULT_OUT_OF_RANGE
    4. Extend the Loop Object Type to Support Specific Low and High Error Limits
    5. Add the Ability to Report Faults to Date and Time Related Value Objects
    6. Add the Ability to Report Faults to the Command, Device, and Notification Class Objects

  • Addendum 135-2012ax (This addendum is final and was approved by the ASHRAE Standards Committee on June 28, 2014; by the ASHRAE Board of Directors on July 2, 2014; and by the American National Standards Institute on July 3, 2014.)
     
    1. Remove Incorrect Recipient_List Requirement to be Non-empty
    2. Section Removed
    3. Extend the Allowable BACnetPropertyStates Enumeration Range
    4. Specifically Disallow Duplicate Time Entries in Schedules
    5. Non-BBMD Responses to BBMD BVLL Requests

  • Addendum 135-2012ay (This addendum underwent its 2nd 45-day Publication Public Review of Independent Substantive Changes from March 7 to April 21, 2014.)
     
    1. Add a Timer Value Object
    2. Correct Expiry_Time property name to Expiration_Time in the Access Credential Object

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2012ay.

  • Addendum 135-2012az (This addendum is final and was approved by the ASHRAE Standards Committee on June 28, 2014; by the ASHRAE Board of Directors on July 2, 2014; and by the American National Standards Institute on July 3, 2014.)
     
    1. Add Binary Lighting Output Object Type
    2. Setting Non-zero Values to Change_Of_State_Count and Elapsed_Active_Time

  • Addendum 135-2012ba (This addendum underwent its 2nd 45-day Publication Public Review from March 7 to April 21, 2014.)
     
    1. Add CSML Descriptions into BACnet Devices
    2. Add Semantic Tags to All Objects
    3. Extend Structured View Object to Contain Semantic Information
    4. Change Clause 21 identifiers to use a consistent format

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2012ba.

Addenda to BACnet-2010

Note: Many of the addenda to BACnet-2010 were begun during the "lifetime" of BACnet-2008 but their development and final public reviews were not completed in time to be incorporated into BACnet-2010. Therefore, some of the files for earlier drafts contain the string "2008" in their titles even though they pertain to revisions to BACnet that will eventually be applied to BACnet-2010 or, possibly, subsequent consolidated versions of the standard.

  • Addendum 135-2010i (This addendum is final and was approved by the ASHRAE Standards Committee on October 2, 2012; by the ASHRAE Board of Directors on October 26, 2012; and by the American National Standards Institute on October 27, 2012.)
     
    1. Define new Lighting Output object type

  • Addendum 135-2010aa (This addendum is final and was approved by the ASHRAE Standards Committee on June 23, 2012; by the ASHRAE Board of Directors on June 27, 2012; and by the American National Standards Institute on July 26, 2012.)
     
    1. Add Channel Object Type
    2. Add WriteGroup Service

  • Addendum 135-2010ad (This addendum is final and was approved by the ASHRAE Standards Committee on June 25, 2011; by the ASHRAE Board of Directors on June 29, 2011; and by the American National Standards Institute on June 30, 2011.)
     
    1. This section was removed
    2. Provide Examples of Encoding Tag Numbers Greater than 14
    3. Allow Feedback_Value to be used to calculate Elapsed_Active_Time
    4. Add READ_ACCESS_DENIED condition to ReadProperty and ReadPropertyMultiple
    5. Remove Unqualified Frame Reference in USE_TOKEN
    6. Align the Loop Object's Out_Of_Service Behavior with Other Objects
    7. Add DM-DDB-A to the Device Profile B-AAC
    8. This section was removed after the first public review
    9. Clarify Requirements for BBMDs
    10. Restrict BBMD Foreign Device Forwarding
    11. Restrict ReadRange 'Count' to INTEGER16

  • Addendum 135-2010ae (This addendum is final and was approved by the ASHRAE Standards Committee on June 25, 2011; by the ASHRAE Board of Directors on June 29, 2011; and by the American National Standards Institute on June 30, 2011.)
     
    1. Add a "Too large" error condition to the ERROR authentication encoding
    2. Simplify the Initialization of Negative and Positive Access Rules
    3. Replace Master_Exemption Property of the Access Credential Object Type
    4. Add Fault Enumeration to Door_Status in Access Door Object Type
    5. Clarify the behavior of Door_Unlock_Delay_Time and Present_Value of Access Door

  • Addendum 135-2010af (This addendum is final and was approved by the ASHRAE Standards Committee on June 25, 2011; by the ASHRAE Board of Directors on June 29, 2011; and by the American National Standards Institute on June 30, 2011.)
     
    1. Remove Annex C and Annex D
    2. Clarify Optionality of Properties Related to Intrinsic Event Reporting
    3. Clarify Optionality of Properties Related to Change of Value Reporting
    4. Ensure that Pulse_Rate and Limit_Monitoring_Interval are Always Together
    5. Clarify when Priority_Array and Relinquish_Default are allowed to be Present
    6. Clarify when Segmentation Related Properties are Allowed to be Present
    7. Clarify when Virtual Terminal Related Properties are Allowed to be Present
    8. Clarify when Time Synchronization Interval Properties are Allowed to be Present
    9. Clarify when Backup and Restore Properties are Allowed to be Present
    10. Clarify when the Active_COV_Subscriptions Property is Allowed to be Present
    11. Clarify when the Slave Proxy Properties are Allowed to be Present
    12. Clarify when the Restart Related Properties are Allowed to be Present
    13. Clarify when the Log_DeviceObjectProperty Property is Allowed to be Present
    14. Clarify when the Clock Aligning Properties are Allowed to be Present
    15. Clarify when the Occupancy Counting Properties are Allowed to be Present
    16. Add the Ability to Configure Event Message Text
    17. Add an Event Detection Enable / Disable Property
    18. Add the Ability to Dynamically Suppress Event Detection
    19. Add the Ability to Specify a Different Time Delay for TO-NORMAL Transitions
    20. Add the Ability to Inhibit the Evaluation of Fault Conditions
    21. Separate the Detection of Fault Conditions from Intrinsic Reporting
    22. This section removed after the first public review.
    23. Ensure that Event Notifications are not Ignored due to Character Set Issues
    24. Make the Event Reporting Property Descriptions Consistent
    25. Identify the Property in each Object that is Monitored by Intrinsic Reporting
    26. Change the Description of the Reliability Property
    27. Improve Fault Detection in Event Enrollment Objects
    28. Add the Ability for some Objects Types to Send Only Fault Notifications
    29. Add a Notification Forwarder Object Type
    30. Reduce the Requirements on Notification-Servers
    31. Add an Alert Enrollment Object Type
    32. Improve the Specification of Event Reporting

  • Addendum 135-2010ak (This addendum is final and was approved by the ASHRAE Standards Committee on June 23, 2012; by the ASHRAE Board of Directors on June 27, 2012; and by the American National Standards Institute on June 28, 2012.)
     
    1. Specify Address Range Requirements
    2. Specify 'abort-reason' Values
    3. Add Serial_Number Property

  • Addendum 135-2010ao (This addendum is final and was approved by the ASHRAE Standards Committee on October 2, 2012; by the ASHRAE Board of Directors on October 26, 2012; and by the American National Standards Institute on October 27, 2012.)
     
    1. Update ReadRange Example
    2. Add Present Value Range to Value Objects
    3. Clarify Reject-Message-To-Network reason #3 DNET
    4. Prevent Reliance on Static Router Bindings
    5. Add Property_List Property

Addenda to BACnet-2008

Note: Many of the addenda to BACnet-2008 were begun during the "lifetime" of BACnet-2004 but their development and final public reviews were not completed in time to be incorporated into BACnet-2008. Therefore, some of the files for earlier drafts contain the string "2004" in their titles even though they pertain to revisions to BACnet that will eventually be applied to BACnet-2008 or, possibly, subsequent consolidated versions of the standard.

  • Addendum 135-2008g (This addendum is final and was approved by the ASHRAE Standards Committee on June 26, 2010; by the ASHRAE Board of Directors on June 30, 2010; and by the American National Standards Institute on July 1, 2010.)
     
    1. Update BACnet Network Security

  • Addendum 135-2008h (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.)
     
    1. Change Device_Busy to Busy and apply to the Command Object type
    2. Prevent overflow and underflow in Pulse_Converter object's Count property
    3. Add context tags to Clause 21 production BACnetPropertyStates
    4. Add new BACnetEngineering Units
    5. Define COV notification service Error returns
    6. Remove non-support for automatic cancellation of COV subscriptions
    7. (Add support for the UTF-8 character set moved to Addendum k)
    8. Add even and odd day support in scheduling

  • Addendum 135-2008j (This addendum is final and was approved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors on June 24, 2009; and by the American National Standards Institute on June 25, 2009.) The addendum defines physical access control extensions to BACnet. Although access control is part of the building automation system, in many ways it is more complex and has different constraints and requirements than typical HVAC control. In particular, there is a much greater emphasis on the security of the devices and the communications to those devices. Addendum 135-2004g provides a new BACnet security architecture to address these and other concerns.)
     
    1. Add a new Access Point object type
    2. Add a new Access Zone object type
    3. Add a new Access User object type
    4. Add a new Access Rights object type
    5. Add a new Access Credential object type
    6. Add a new Credential Data Input object type
    7. Add a new Access ACCESS_EVENT event algorithm
    8. Add a new Annex P BACnet encoding rules for authentication factor values

  • Addendum 135-2008k (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.) Addendum 135-2008k adds support for one "Character Encoding Form" at a time, needed for interoperability. Also incorporates the Japanese Industrial Standard Committee's change from "JIS C 6226" to "JIS X 0208."
     
    1. Add support for UTF-8
    2. Change JIS reference

  • Addendum 135-2008l (This addendum is final and was approved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors on June 24, 2009; and by the American National Standards Institute on June 25, 2009.) Addendum 135-2008l adds new operator workstation profiles and BIBBs.
     
    1. Add new workstation BIBBs and profiles

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2004l.
    Here is the link to the 2nd Publication Public Review Draft of Addendum 135-2008l.
    Here is the link to the 3rd Publication Public Review Draft of Addendum 135-2008l.

  • Addendum 135-2008n (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.)
     
    1. Add support for long Backup and Restore preparation times

  • Addendum 135-2008o (This addendum is final and was approved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors on June 24, 2009; and by the American National Standards Institute on June 25, 2009.)
     
    1. Accommodate remote operator access and NAT in Annex J BACnet/IP

  • Addendum 135-2008p (This addendum is final and was approved by the ASHRAE Standards Committee on June 26, 2010; by the ASHRAE Board of Directors on June 30, 2010; and by the American National Standards Institute on July 1, 2010.)
     
    1. Add a new Global Group object type

  • Addendum 135-2008q (This addendum is final and was approved by the ASHRAE Standards Committee on January 24, 2009; by the ASHRAE Board of Directors on January 28, 2009; and by the American National Standards Institute on January 29, 2009.)
     
    1. Allow unicast I-Ams
    2. Define virtual addressing for data links with MAC addresses longer than 6 octets
    3. Define the use of ZigBee as a BACnet data link layer

  • Addendum 135-2008r (This addendum is final and was approved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors on June 24, 2009; and by the American National Standards Institute on June 25, 2009.)
     
    1. Clarify transitions in FLOATING_LIMIT and OUT_OF_RANGE events
    2. Clarify router action when a network is marked as temporarily unreachable
    3. Clarify the destination MAC used when replying to a broadcast DER frame
    4. Clarify the handling of write priorities greater than 16
    5. Clarify LogDatum presentation

  • Addendum 135-2008s (This addendum is final and was approved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors on June 24, 2009; and by the American National Standards Institute on June 25, 2009.)
     
    1. Clarify the circumstances that cause the File object's Archive property to be set to TRUE or FALSE
    2. Require support for COV subscriptions of at least 8 hours' lifetime
     
  • Addendum 135-2008t (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.) A new standard way of representing building data will give BACnet new capabilities for standardized communications between a wide range of applications. A definition for an XML syntax which can be used to represent building data in a consistent, flexible and extensible manner is defined by this addenda in the form of a new annex to the standard.

    The Extensible Markup Language (XML) is a popular technology in the data processing and communications worlds due to its ability to model a wide range of data and its ability to be transformed and extended. With this new IT-friendly way of representing building data, BACnet will open up a range of possible new ways to share data. XML can be used for exchanging files between systems, integrating buildings with energy utilities, and expanding enterprise integration with richer Web services. Some of these new applications will be standardized in future addenda to the standard based on the syntax defined here.

    1. XML Data Formats

  • Addendum 135-2008u (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.)
     
    1. Clarify the use of RejectPDUs
    2. Add error code UNSUPPORTED_OBJECT_TYPE for CreateObject service
    3. Add new Abort and Error codes
    4. Specify proper Errors when attempting access to the Log_Buffer property

  • Addendum 135-2008v (This addendum is final and was approved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors on June 24, 2009; and by the American National Standards Institute on June 25, 2009.)
     
    1. Fix the MS/TP TokenCount Value
    2. Clarify "Supported"
    3. Remove NM-CE-A from Device Profiles

  • Addendum 135-2008w (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.)
     
    1. Add more primitive value objects

  • Addendum 135-2008x (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.)
     
    1. Fix the Criteria for COV for Load Control
    2. Clarify Trend Log Time Stamp
    3. Clarify ReadRange on Lists
    4. Clarify Results of Using Special Property Identifiers

  • Addendum 135-2008y (This addendum is final and was approved by the ASHRAE Standards Committee on January 23, 2010; by the ASHRAE Board of Directors on January 27, 2010; and by the American National Standards Institute on January 28, 2010.)
     
    1. Specify Deployment Options for MS/TP

  • Addendum 135-2008z (This addendum is final and was approved by the ASHRAE Standards Committee on June 26, 2010; by the ASHRAE Board of Directors on June 30, 2010; and by the American National Standards Institute on July 1, 2010.)
     
    1. Add Event_Message_Texts
    2. Add UnconfirmedEventNotification to Automated Trend Retrieval BIBBs
    3. Modify MS/TP State Machine to Ignore Data Not For Us
    4. Add New Engineering Units
    5. Add Duplicate Segment Detection

  • Addendum 135-2008ab (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Add More Standard Baud Rates for MS/TP

  • Addendum 135-2008ac (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Clarify the Usage of Dates and Times

  • Addendum 135-2008ag (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Prevent BBMD Broadcast Storms
    2. Align BIBBs for Automated Trend Retrieval

  • Addendum 135-2008ah (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on March 3, 2011.)
     
    1. Remove ReadPropertyConditional

Published Addenda to BACnet-2004 (incorporated into BACnet-2008)
  • Addendum 135-2004a (This addendum was approved for publication by the ASHRAE Board of Directors and by the American National Standards Institute on February 10, 2005.)
     
    1. Revise Life Safety Point and Life Safety Zone objects to modify their behavior when placed out of service
     
  • Addendum 135-2004b (This addendum was approved by ASHRAE Board of Directors on October 24, 2008 and by the American National Standards Institute on October 27, 2008.)
     
    1. Add a new Event Log object type
    2. Add a new Global Group object type
    3. Add a new Trend Log Multiple object type
    4. Harmonize the Trend Log object with the new Event Log and Trend Log Multiple objects
    5. Define a means for a device to provide a notification that it has restarted
    6. Define a means to configure a device to periodically send time synchronization messages
    7. Extend the number of character sets supported
    8. Enable devices other than alarm recipients to acknowledge alarms
    9. Allow MS/TP BACnet Data Expecting Reply frames to be broadcast
    10. Revise the Clause 5 state machines to handle slow servers
    11. Add new Error Codes and specify usage
    12. Add new Reliability enumeration to objects with a Reliability property

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2004b.
    Here is the link to the 2nd Publication Public Review Draft of Addendum 135-2004b that contains contains only independent substantive changes made to the first public review draft and must be reviewed with that document.
    Here is the link to the 3rd Publication Public Review Draft of Addendum 135-2004b that contains contains only independent substantive changes made to the second public review draft and must be reviewed with that document.

  • Addendum 135-2004c (This addendum was approved for publication by the ASHRAE Board of Directors September 29, 2006 and by the American National Standards Institute on October 2, 2006.)
     
    1. Add BACnet/WS web services interface

  • Addendum 135-2004d (This addendum was approved for publication by the ASHRAE Board of Directors June 29, 2006 and by the American National Standards Institute on June 30, 2006.)
     
    1. Add a new Structured View object type
    2. Allow acknowledgement of unseen TO-OFFNORMAL event notifications
    3. Relax the Private Transfer and Text Message BIBB requirements
    4. Exclude LIFE_SAFETY and BUFFER_READY notifications from the Alarm Notifications BIBBs
    5. Establish the minimum requirements for a BACnet device with an application layer
    6. Remove the requirement for the DM-DOB-A BIBB from the B-OWS and B-BC device profiles
    7. Relax mandated values for APDU timeouts and retries when configurable, and change default values
    8. Fix EventCount handling error in MS/TP Master Node State Machine
    9. Permit routers to use a local network number in Device_Address_Binding
    10. Identify conditionally writable properties
    11. Specify Error returns for the AcknowledgeAlarm service

  • Addendum 135-2004e (This addendum was approved for publication by the ASHRAE Board of Directors March 25, 2007 and by the American National Standards Institute on March 26, 2007.)
     
    1. Add a new Load Control object type
     
    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2004e.
    Here is the link to the 2nd Publication Public Review Draft of Addendum 135-2004e that contains only independent substantive changes made to the first public review draft and must be reviewed with that document.
     
  • Addendum 135-2004f (This addendum was approved for publication by the ASHRAE Board of Directors March 25, 2007 and by the American National Standards Institute on March 26, 2007.)
     
    1. Add a new Access Door object type

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2004f.
    Here is the link to the 2nd Publication Public Review Draft of Addendum 135-2004f.

  • Addendum 135-2004m (This addendum was approved for publication by the ASHRAE Board of Directors on October 24, 2008; and by the American National Standards Institute on October 27, 2008.) Addendum 135-2004m contains 12 independent changes to the BACnet standard, including: resolving Foreign Device registration period ambiguities, clarifying the GetEventEnrollment service's Priority Filter parameter, adding requirements to Alarm and Event BIBBs, and defining "object."
     
    1. Resolve Foreign Device registration grace period and remaining time ambiguities
    2. Improve Clause 5 FillWindow segment timeout constraints
    3. Clarify the Priority Filter parameter in the GetEventEnrollment service request
    4. Allow alarms to be re-acknowledged successfully
    5. Add requirements to Alarm and Event BIBBs
    6. Remove B-BC requirements for BIBBs without use cases
    7. Clarify that a device may support only the ReinitializeDevice restart choices
    8. Clarify DeviceCommunicationsControl and ReinitializeDevice interactions
    9. Define "object"
    10. Add a Deadband property to the Loop object
    11. Correct the TO-FAULT conditions in the Life Safety objects' Reliability properties
    12. Clarify the Trend Log's acquisition of Status_Flags

    Here is the link to the 1st Publication Public Review Draft of Addendum 135-2004m.

Published Addenda to BACnet-2001 (incorporated into BACnet-2004)
  • Addendum 135-2001a
     
    1. Add Partial Day Scheduling to the Schedule object
    2. Enable reporting of proprietary events by the Event Enrollment object
    3. Allow detailed error reporting when all ReadPropertyMultiple accesses fail
    4. Remove the Recipient property from the Event Enrollment object
    5. Add the capability to issue I-Am responses on behalf of MS/TP slave devices
    6. Add a new silenced mode to the DeviceCommunicationControl service
    7. Add 21 new engineering units
    8. Specify the behavior of a BACnetArray when its size is changed
    9. Clarify the behavior of a BACnet router when it receives an unknown network message type
     
  • Addendum 135-2001b
     
    1. Remove UTC timestamps from Trend Logs and guarantee Trend Log record ordering
     
  • Addendum 135-2001c
     
    1. Allow Life Safety objects to advertise supported mode
    2. Add Unsilence Options to the LifeSafetyOperation Service
    3. Specify the relationship between the Event_Type and Event_Parameter properties
    4. Add a new Accumulator Object Type
    5. Add a new Pulse Converter Object Type
    6. Standardize event notification priorities
    7. Define Abort reason when insufficient segments are available
    8. Add new Error Codes and specify usage
     
  • Addendum 135-2001d
     
    1. Add clauses describing BACnet-EIB/KNX mapping
Published Addenda to BACnet-1995 (incorporated into BACnet-2001)
  • Addendum 135-1995a
     
    1. Add Annex J - BACnet/IP and supporting definitions
     
  • Addendum 135-1995b
     
    1. Inconsistencies are eliminated in the definitions of the Analog and Binary Value object types
    2. Any device that receives and executes UnconfirmedEventNotification service requests must support programmable process identifiers
    3. Modify each event-generating object type to contain the last timestamp for each acknowledgeable transition
    4. Modify the Notification Class object by requiring that the 'Notification Class' property be equivalent to the instance number of the Notification Class object
    5. Modify the Event Notification services to make the 'To State' parameter mandatory for notifications of type ACK_NOTIFICATION
    6. A new BACnetDeviceObjectPropertyReference production is added and its use in the Event Enrollment and Schedule object types is specified
    7. Add a Multi-state Value object type
    8. Add an Averaging object type
    9. Change all 'Process Identifier' properties and parameters to Unsigned32
    10. Change the Multi-state Input object type to correct flaws related to fault detection and reporting and achieve consistency with the proposed Multi-state Value object type
    11. Add a Protocol_Revision property to the Device object type
    12. The File object type is changed to allow truncation and partial deletion operations
    13. A new ReadRange service is added to permit reading a range of data items from a property whose datatype is a list or array of lists
    14. A new UTCTimeSynchronization service is introduced and related changes are made to properties in the Device object type
    15. Add a Trend Log object type
    16. The UnconfirmedCOVNotification service is extended to allow notifications without prior subscription as a means of distributing globally important data to a potentially large number of recipients
    17. Add eight new BACnet engineering units
     
  • Addendum 135-1995c
     
    1. Add a new Life Safety Point object type that represents the characteristics of initiating and indicating devices in the fire, life safety, and security applications
    2. Add a new Life Safety Zone object type that represents the characteristics associated with an arbitrary group of BACnet Life Safety Point and Life Safety Zone objects
    3. Add functionality to the existing BACnet alarm and event features needed to support the Life Safety Point and Life Safety Zone object types
    4. Add a new LifeSafetyOperation service that provides silence and reset capabilities needed for life safety systems
    5. Add a new subclause to 19 to describe the use of existing BACnet services to provide backup and restore capability
    6. Define a new service, SubscribeCOVProperty, to allow COV notifications for arbitrary properties of an object with subscriber-specified COV increments
    7. Add Vendor ID to proprietary MS/TP frames
    8. Add a new service, GetEventInformation, that provides enough information to acknowledge alarms
     
  • Addendum 135-1995d
     
    1. Replace Clause 22 with a new clause entitled "Conformance and Interoperability"
    2. Update Annex A, "Protocol Implementation Conformance Statement"
    3. Add a new Annex K entitled "BACnet Interoperability Building Blocks (BIBBs)"
    4. Add a new Annex L entitled "Descriptions and Profiles of Standardized BACnet Devices"
     
  • Addendum 135-1995e
     
    1. Define the PTP connection status when the half-router can and cannot re-establish the connection
    2. Add Object Profiles and Extensions
    3. Add the capability for devices to advertise the maximum number of segments of a segmented APDU that they can receive
Standard ANSI/ASHRAE 135.1

The need to define a set of procedures for the testing of BACnet implementations has led to the drafting of a companion standard, ANSI/ASHRAE 135.1, Method of Test for Conformance to BACnet. The companion standard to ANSI/ASHRAE Standard 135 (BACnet) contains detailed tests for every feature of the BACnet protocol and provides the basis for testing and listing programs that have been established by BACnet International, the successor organization to the BACnet Manufacturers Association.

Addenda to 135.1-2011
  • Addendum 135.1-2011j (This addendum is final and was approved by the ASHRAE Standards Committee on June 23, 2012; by the ASHRAE Board of Directors on June 27, 2012; and by the American National Standards Institute on June 28, 2012.)
     
    1. Improve the Read All Properties Test
    2. Improve the Write Support Test
    3. Improve the Command Prioritization Test
    4. Clarify the Application of the Event_Enable Test
    5. Improve the Limit_Enable Test
    6. Update the Calendar Test
    7. Update Notification Class Tests to use UTCTimeSynchronization
    8. Update Schedule Tests to use UTCTimeSynchronization
    9. Add Protocol Revision 4 Schedule Object Tests
    10. Revise Stop_When_Full Test
    11. Make the Start_Time Test Generic
    12. Make the Log_Interval Test Generic
    13. Make the Buffer_Size Test Generic
    14. Correct the Record_Count Test
    15. Correct the Notification_Threshold Test
    16. Add Trigger Verification Tests
    17. Update BUFFER_READY Tests
    18. Add COV Subscription Lifetime Value Range Tests
    19. Modify List Management Test
    20. Implement COV Testing By Datatype

  • Addendum 135.1-2011k (This addendum is final and was approved by the ASHRAE Standards Committee on October 2, 2012; by the ASHRAE Board of Directors on October 26, 2012; and by the American National Standards Institute on October 27, 2012.)
     
    1. Manual MS/TP Tests

  • Addendum 135.1-2011l (This addendum is final and was approved by the ASHRAE Standards Committee on January 21, 2012; by the ASHRAE Board of Directors on January 25, 2012; and by the American National Standards Institute on January 26, 2012.)
     
    1. Generalize the Notify_Type Test
    2. Add in a Test for Resizable Array Properties
    3. Correct the Usage of VERIFY vs. CHECK in the Record_Count Test
    4. Correct the Trend Log COV Subscription Failure Test
    5. Remove the Testing Requirement That Status_Flags be Changeable
    6. Allow WritePropertyMultiple Tests to be Applied to Array Properties
    7. Modify Event Notifications Tests to Allow Use of Event Enrollment Objects
    8. Add a Test for Acknowledging Offnormal Events
    9. Update Expected Error Codes Negative COV Tests
    10. Correct the Use of WAIT vs. BEFORE in COV Notification Tests
    11. Improve Reading Multiple Properties with Multiple Embedded Access Errors Test
    12. Expand Allowable Errors for Older Product When Reading Array Properties
    13. Improve the Basic DeviceCommunicationControl Tests
    14. Add Alarm Summarization Tests
    15. Add Event Log Tests
    16. Add Structured View Tests
    17. Correct AddListElement Test
    18. Add ReadRange Test
    19. Remove Reliance on EPICS from DCC Test
    20. Add Who-Has Tests
    21. Correct Unknown Network Layer Message Type For Someone Else Test
    22. Clarify TRANSMIT And RECEIVE Addressing Information

  • Addendum 135.1-2011m (This addendum is final and was approved by the ASHRAE Standards Committee on October 2, 2012; by the ASHRAE Board of Directors on October 26, 2012; and by the American National Standards Institute on October 27, 2012.)
     
    1. Add Network Priority Test
    2. Add Virtual Router Tests
    3. Replace Time Master Tests
    4. Add Backup and Restore Tests
    5. Add APDU Retry Test
    6. Add Workstation Schedule Interaction Tests

  • Addendum 135.1-2011n (This addendum is final and was approved by the ASHRAE Standards Committee on January 21, 2012; by the ASHRAE Board of Directors on January 25, 2012; and by the American National Standards Institute on January 26, 2012.)
     
    1. Restrict The "Non-Documented" Test To Standard Object Types
    2. Add Router Binding Test
    3. Update Priority_For_Writing Tests
    4. Make Trend Log Tests Generic
    5. Bring Attention To Change In Length Of BACnetLogStatus
    6. Clarify That "Ignore Remote Packets" Test is Not for Use with Intervening Router
    7. Modify B/IP Test For NAT Operation

  • Addendum 135.1-2011o (This addendum completed its 1st 45-day Publication Public Review on September 16, 2013.)
     
    1. Align SubscribeCOVProperty error codes with SubscribeCOV
Addenda to 135.1-2009
  • Addendum 135.1-2009d (This addendum is final and was approved by the ASHRAE Standards Committee on June 26, 2010; by the ASHRAE Board of Directors on June 30, 2010; and by the American National Standards Institute on July 1, 2010.)
     
    1. Add test to verify that COV subscription lifetimes are not affected by time-sync requests
    2. Add new Active_COV_Subscription tests

  • Addendum 135.1-2009e (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Revise BACnet/IP tests

  • Addendum 135.1-2009f (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Clarify Tests for Ack Notification Timestamps
    2. Add new Database_Revision tests
    3. Update CreateObject Service Tests
    4. Update DeleteObject Service Tests

  • Addendum 135.1-2009g (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Correct Test Step Indention
    2. Remove Recipient Test
    3. Correct Errors in Routing Tests
    4. Change the Ignore Process ID Test
    5. Add Test for Device Identifier Recipients
    6. Add Test for Network Address Recipients
    7. Add Tests for Disable Initiation
    8. Change Tests for Out_Of_Service, Status_Flags, and Reliability
    9. Add Tests for Non-router Network Layer Messages
    10. Remove Time Delay in TO-FAULT Tests
    11. Make Additions to the TCSL Language
    12. Change Acknowledge Alarm Initiation Tests
    13. Add New Tests for Reading and Presenting Properties
    14. Add New Event Notification Tests
    15. Update Trending Tests for Revision 3
    16. Add New Tests for Revision 4 Schedules
    17. Add New Test for Event Notification Network Priority
    18. Add Device and Network Mapping Tests
    19. Add Device Restart Notification Tests
    20. Add Schedule Written Datatypes Tests

  • Addendum 135.1-2009h (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Change GetEventInformation Chaining Tests
    2. Change CHANGE_OF_STATE Test for Event Enrollment Object
    3. Change ConfirmedCOVEventNotification Service Initiation Tests to Non-infinite Lifetimes
    4. Change intrinsic tests for Event Enrollment Object

  • Addendum 135.1-2009i (This addendum is final and was approved by the ASHRAE Standards Committee on January 29, 2011; by the ASHRAE Board of Directors on February 2, 2011; and by the American National Standards Institute on February 3, 2011.)
     
    1. Improve Schedule Object Restoration Tests
    2. Add Test to Check Range of the Present_Value of Multi-state Objects
    3. Add Test for SubscribeCOV Service Execution Without a Lifetime Parameter
    4. Update Test for Processing of ReadProperty Service Responses
    5. Add Tests for Processing of GetEventInformation Service Responses
    6. Add Tests for Fallback from ReadPropertyMultiple to ReadProperty
    7. Allow Priorities in WriteProperty and WritePropertyMultiple Tests
    8. Add Test for Writing Array Size
    9. Clarify Test for Writing with a Value that is Out of Range
    10. Update Test for Writing with an Invalid Datatype
    11. Relax ReadPropertyMultiple Error Test
    12. Add Test for Unicast Who-Is
    13. Revise Unknown Network Layer Message Test
    14. Add New Trend Log Tests
    15. Add Event_Type Test
    16. Revise DeviceCommunicationControl Test
    17. Add Alarm Re-acknowledgement Tests
    18. Modify I-Am Tests
    19. Add A-side Trend Tests
    20. Make the EPICS Definition Generic
    21. Clarify Priority in the GetEnrollmentSummary Priority Filter Test
    22. Add Non-documented Property and Read-Only Property Tests

Addenda to 135.1-2007
  • Addendum 135.1-2007b (This addendum is final and was approved by the ASHRAE Standards Committee on June 20, 2009; by the ASHRAE Board of Directors on June 24, 2009; and by the American National Standards Institute on June 25, 2009.)
     
    1. Omit certain tests when Averaging and Command properties are fixed or not present
    2. Accommodate Group objects whose members list is not changeable
    3. Revise Alarm Acknowledgement tests
    4. Add new Alarm Acknowledgement "offnormal" tests
    5. Label conditionally-writable properties in the EPICS
    6. Add new object types

Published Addenda to 135.1-2003 (incorporated into 135.1-2007)
  • Addendum 135.1-2003a (This addendum was approved by the ASHRAE Standards Committee on January 21, 2006; by the ASHRAE Board of Directors on January 26, 2006; and by the American National Standards Institute on January 27, 2006.)
     
    1. Add Partial Day Scheduling to the Schedule object
    2. Enable reporting of proprietary events by the Event Enrollment object
    3. Allow detailed error reporting when all ReadPropertyMultiple accesses fail
    4. Remove the Recipient property from the Event Enrollment object
    5. MS/TP slave proxy tests
    6. Add a new silenced mode to the DeviceCommunicationControl service
    7. Addition of tests for Data Sharing BIBBs
    8. Specify the behavior of a BACnetARRAY when its size is changed
    9. Clarifying the behavior of a BACnet router when it receives an unknown network message type
    10. Testing unsupported service request execution
    11. Reading entire arrays
    12. Update negative tests
     
  • Addendum 135.1-2003c (This addendum was approved by the ASHRAE Standards Committee on June 23, 2007; by the ASHRAE Board of Directors on June 27, 2007; and by the American National Standards Institute on June 28, 2007.)
     
    1. Update references to refer to 135-2004
    2. Add new object types from 135-2004
    3. Omit certain tests based on Protocol_Revision
    4. Exception schedule priority requirements
    5. Minor corrections