Image Processing Reference
In-Depth Information
29
Data Communications for
Distributed Building Automation
. Introduction .........................................
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. BuildingServices.....................................
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. BuildingAutomationandItsBeneits ................
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Integration
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Automation and Control
. ApplicationModeling................................
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Data Communication Services
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Communication
Characteristics and Strategies
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Distributing Functions
and Services
. OpenStandards......................................
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Plant Room and Field Level Subsystems
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BACnet
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LonWorks
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KNX
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IEEE ..
and ZigBee
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Web Services
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Home Automation
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Standardization
. ConclusionandOutlook .............................
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References .................................................
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Wolfgang Kastner
Vienna University of Technology
Georg Neugschwandtner
Vienna University of Technology
29.1 Introduction
Building automation is concerned with monitoring and control of
building services
equipment. his
specifically includes heating, ventilation, and air-conditioning (HVAC) systems as well as devices for
lighting and shading. However, integration with systems from other building disciplines, such as fire
safety, is also of relevance. Large spaces need to be covered and centralized (and remote) access to
all data is important. The requirements of this domain are best fulfilled by distributed embedded
systems. In the following pages, requirements, approaches, and standards for data communication
within such systems are discussed.
First, an overview of building services is given to describe the background of automation efforts in
this domain. hen, the benefits of automation are presented, including the pros and cons of system
integration and separation. Next, common concepts for modeling building automation applications
are introduced. his model is then extended to accommodate interoperable distribution of functions
over a network. Required communication services and communication paradigms are presented,
followed by quality of service aspects and appropriate mechanisms. A discussion of implementation
considerations concludes the first part.
The second part focuses on open protocol standards of key relevance in the building automation
domain. Besides a discussion of the three most popular representatives (BACnet, LonWorks, KNX), it
also includes information on the wireless world (ZigBee) and Web services (WS) based specifications.
Finally, a quick glance is cast on home automation and an outlook is given.