Email   Password


ASHRAE Membership

ASHRAE membership is open to any person associated with heating, ventilation, air conditioning or refrigeration. ASHRAE is unique because its membership is drawn from a wide range of disciplines relating to the HVAC&R field. Over 56,000 individuals from more than 100 nations belong to the Society.

Discounts on Publications

ASHRAE members earn 15% off publications. Hundreds of titles are available including the complete collection of ASHRAE Standards including 90.1, 62.1 and 189.1.

Develop Leadership Skills

When you join ASHRAE, you are making an investment in yourself. When you become active in the Society by giving your time and sharing your knowledge, you get even more out of that investment.

Network with Industry Professionals

Each month, all over the world, ASHRAE chapters convene for an informational program featuring a speaker or topic that is key to professionals in the industry. Meet with your peers and share ideas.
Need technical info? Search ASHRAE's Bookstore >
Standards, Research & Technology

Addenda to Standard 135-1995

NOTE: All documents linked from this page are in PDF PDF-format.

(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.)