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Wireless for Controls: An Update (Emerging Technologies)

By ASHRAE Journal

Release : 2008-08-01

Genre : Engineering, Books, Professional & Technical

Kind : ebook

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Wireless systems in commercial buildings offer the potential to reduce the installed cost of communicating sensed data by supplanting or augmenting wired infrastructure with digital radio-based communications. A generic wireless data transmission system includes transmitters and receivers, and a translator to allow the wireless receiver to communicate with a control network. It may also use repeaters to increase the range of wireless signals. Basic wireless systems include wire replacement systems, where the sensor, transmitter and receiver use line power but communicate wirelessly, and fully wireless schemes (i.e., having all battery-powered components). More sophisticated wireless systems use mesh networks, where some or all nodes can serve as transmitters and receivers and as routers that can relay messages from their neighbors. An effective mesh network provides multiple communication pathways and dynamically identifies the optimum transmission path for each node in response to network traffic and interference. (1,2) Consequently, the network tends to become stronger as the number of devices connected to the network increases (more potential paths from one node to another). (3) This redundancy increases reliability in real-world building applications, where objects are moved and floorplans altered after network deployment. (4)

Wireless for Controls: An Update (Emerging Technologies)

By ASHRAE Journal

Release : 2008-08-01

Genre : Engineering, Books, Professional & Technical

Kind : ebook

(0 ratings)
Wireless systems in commercial buildings offer the potential to reduce the installed cost of communicating sensed data by supplanting or augmenting wired infrastructure with digital radio-based communications. A generic wireless data transmission system includes transmitters and receivers, and a translator to allow the wireless receiver to communicate with a control network. It may also use repeaters to increase the range of wireless signals. Basic wireless systems include wire replacement systems, where the sensor, transmitter and receiver use line power but communicate wirelessly, and fully wireless schemes (i.e., having all battery-powered components). More sophisticated wireless systems use mesh networks, where some or all nodes can serve as transmitters and receivers and as routers that can relay messages from their neighbors. An effective mesh network provides multiple communication pathways and dynamically identifies the optimum transmission path for each node in response to network traffic and interference. (1,2) Consequently, the network tends to become stronger as the number of devices connected to the network increases (more potential paths from one node to another). (3) This redundancy increases reliability in real-world building applications, where objects are moved and floorplans altered after network deployment. (4)

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