Five BACnet Addenda Open for Public Review

ATLANTA – Five addenda to ASHRAE’s BACnet standard are available for public review until May 1.

ANSI/ASHRAE Standard 135-2004, BACnet® -- A Data Communication Protocol for Building Automation and Control Networks, allows building equipment and systems manufactured by different companies to work together.

To obtain drafts of or comment on proposed addenda c, d, e, f and g, visit www.ashrae.org/standards.

The BACnet Web services proposed in addendum c would provide access to data in BACnet systems using standard PC desktop software vs. specialized drivers. They also are proposed for the communications between energy utilities and BACnet systems for demand limiting and real-time pricing.

Proposed addendum d contains a number of additions to the standard, foremost of which is the structured view object. This would provide a means for devices to present the relationships between objects and groups of objects, facilitating the development of standard profiles for devices such as VFD drives.

The load control object proposed in addendum e would provide a standardized means for external control over load shedding and is the first of several proposals from the utilities integration working group, working to connect the energy utilities with building automation systems.

Proposed addendum f includes the first of a series of new BACnet access control objects in development in the life safety and security working group. The access door object represents the physical characteristics of an access-controlled door and its associated physical hardware and devices, including door contacts, door locks and card readers. The work of this group is being done in conjunction with the Security Industries Association.

A new means for securing network communications would be provided through proposed addendum g. The proposed addendum draws on advances in encryption and authentication technologies, allowing two levels of access, with a general key for reading and writing basis system data, and application-specific keys plus authentication for connecting to critical systems including access control (security) and fire safety.

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