Engineered Systems Magazine

ASHRAE 2008 BACnet Published

May 4, 2009

Guidance to reduce a building’s energy consumption on demand is contained in ASHRAE’s newly published BACnet standard.

ANSI/ASHRAE Standard 135-2008, BACnet® -- A Data Communication Protocol for Building Automation and Control Networks, allows building equipment and systems manufactured by different companies to work together. It is the only open, consensus-developed standard in the building controls industry. The new standard contains seven addenda approved since the 2004 standard was published.

“The 2008 version of the standard incorporates many years of work by the BACnet committee,” said immediate past chair Bill Swan. “This includes material first published a couple of months ago. It replaces the 2004 version as the standard for BACnet technical and specification efforts.”

The standard contains new guidance related to the Load Control object, an extension to reduce a building's energy consumption on demand - a key element of the integration of energy utilities and buildings to reduce or eliminate brownouts and blackouts from energy grid overload.

It also covers:
  • The Access Door object, the first of the extensions to fully support physical access control
  • Improvements in requirements on BACnet devices
  • New capabilities such as BACnet Web Services which, among other things, are being considered for energy utility-building communications
  • A standardized and interoperable means to record alarms
The cost of ANSI/ASHRAE Standard 135-2008, BACnet® -- A Data Communication Protocol for Building Automation and Control Networks, is $119 ($99 ASHRAE members).

To order, contact ASHRAE Customer Service at 1-800-527-4723 (United States and Canada) or 404-636-8400 (worldwide), fax 404-321-5478, or visit at www.ashrae.org/bookstore.