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BACnet Addenda Approved for Publication
Three addenda to the American Society of Heating, Refrigerating and Air-Conditioning
Engineers’ (ASHRAE) BACnet® have been approved for publication.
ANSI/ASHRAE Standard 135-2001, BACnet – A Data Communication Protocol
for Building Automation and Control Networks, is the only open, consensus-developed
standard in the building controls industry.
Addenda 135a, c and d were approved for publication at ASHRAE’s 2004 Winter
Meeting.
Addendum 135a changes the way schedules are represented and maintained in BACnet
systems. BACnet always has had the capability to represent even very complex
schedules, according to Steve Bushby, chair of the committee.
However, if a schedule represents the combination of several independent events,
it has not been possible for a workstation to read the schedule object information
and determine the individual components that were combined to make the overall
schedule.
The features in 135a make it possible to view and manipulate the schedules
at this finer level of detail, he said.
Addendum c contains eight new features that include enhancements to the life
safety objects and services and the ability to represent utility meters and
other measuring devices that provide pulsed outputs.
Addendum d contains information on how to interconnect BACnet devices with
devices that use the EIB/Konnex protocol. In Europe, there is a large installed
base of EIB/Konnex products and defining a way to interconnect these devices
with BACnet devices was one of the key features that led to the adoption of
BACnet as an International Organization for Standardization (ISO) standard.
The addenda are subject to a 15-day appeals period to the Board of Directors.
Published addenda to ASHRAE standards are available for free at ASHRAE.org.
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