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(These descriptions may not be complete and are provided for information only.)
Addendum a (Adds normative Annex J – BACnet/IP and supporting definitions.)
Addendum b (Inconsistencies eliminated in definitions of the Analog and Binary Value object types; Devices that receive and execute Unconfirmed Event Notification service requests must support programmable process identifiers; Modification to each event-generating object type; Modification to Notification Class object; Modification to the Event Notification services; Added new BACnet Device Object Property Reference production and its use specified; Added a Multi-state Value object type; Added an Averaging object type; Changed all ‘Process Identifier’ properties and parameters to Unsigned32; Changed the Multi-state input object type; Added a Protocol_Revision property to the Device object type; Changed the File object type to allow truncation and partial deletion operations; Added a new Read Range service; Added a new UTC Time Synchronization service; Added a Trend Log object type; Extended the Unconfirmed COV Notification service to allow notifications without prior subscription; Added eight new BACnet engineering units.)
Addendum c (Added a new Life Safety Point object type; Added a new Life Safety Zone object type; Added functionality to the existing BACnet alarm and event features to needed to support Life Safety Point and Zone object types; Added a new Life Safety Operation service; Added new subsection to 16 to describe the use of existing BACnet services; Defined a new service, Subscribe COV Property, to allow COV notifications; Added vendor ID to proprietary MS/TP frames; Added new service, Get Event Information that provides enough information to acknowledge alarms.)
Addendum d (Replaced existing Section 22 with new section entitled 'Conformance and Interoperability'; Updated Annex A, Added new normative Annex K entitled 'BACnet Interoperability Building Blocks (BIBBs)'; Added new Annex L entitled 'Descriptions and Profiles of Standardized BACnet Devices'.)
Addendum e (Defined the PTP connection status when the half-router can and cannot re-establish the connection; Added Object Profiles and Extensions; Added capability for devices to advertise the maximum number of segments of a segmented APDU that they can receive.)