A multi-media presentation system for control oriented local area networks (COLAN) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6395wb85w

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  • In recent years, the new integrated circuit technology has spawned the development of many low cost high performance microcontrollers. With the improvement in the processor speed, instruction sets, and memory capacities, these microcontrollers are ideal for the implementation of Control-Oriented Local Area Networks (COLAN) for real-time distributed control systems. The design of COLAN V has evolved from a series of predecessor networks developed at Oregon State University. COLAN V is a low cost, real-time, distributed local control network. The network provides complex control and monitoring of activities remotely from a centralized master scheduler. With a single master scheduler, bus contention and the need for complex protocols are eliminated. Since twisted-pair wire is used as the communication medium, cost is kept at a minimum. As a practical control application, a microcontroller-based local network task node for controlling slide projectors was implemented. The use of a task node to concurrently control several slide projectors enhances the overall effectiveness of a presentation without the high cost associated with the commercially available composer systems. In addition, COLAN V can control and monitor different presentations in different locations through the use of different task nodes from the centralized master scheduler. Since the commercially available composer systems are non-networkable, this is not possible. When monitoring is not required, COLAN V provides the capability of storing a presentation onto a tape along with the corresponding sound. This offers a convenient and economical method for storing an entire audio/visual presentation that can be played back at a later time.
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