The Research Of Power Communication Controller Based On Embedded Linux

There are much digital and analog information needed to be collected and handled in Power Distribution Automation System.The mainstation mainly accomplishes controlling and calculating functions of the whole system, which can't always supply so many resources to accomplish collecting and handling digital and analog information;Further, Terminal measuring-controlling devices are the direct data source of the whole system, and the number of data is very large.Furthermore, there are more than one central supervising- controlling units. There are local and remote supervising- controlling units and different supervising- controlling supervises different data, the communication protocols are also different. The common mainstation doesn't support so many protocols, especially the self-defined protocols.So one link to transmit information is needed to build between mainstation and Terminal supervising-controlling units, this is communication controller.We can use communication controller to complete collection and processing of all kind of digital and analog information, transmit these information to mainstation after processing, complete protocol conversion, and help mainstation to finish the controlling task of the whole system.Generally, communication controller always use singlechip machine as the core processing unit, with serial communication chip extended etc, its structure is simple and the cost is low, so it applies to the application of slow speed and less task. Its limitations are obvious, for example, the serial ports are less, the processing speed is limited, the memory capacity is limited. But communication controller based on PC 104 can solve the problem above very well. The paper selects SBS embedded PG104 SCM-6251 as the hardware platform, and develop software to realize the function of the whole system based on SBS Linux OS.The main function of communication controller is protocol conversion, and accomplishing some other functions needed. Communication is always to involve some communication protocols, the telecontrol transmission protocols used in the paper include 101 protocol and CDT protocol. We analyze and contrast them, and also probe into the application of them, based on the understanding and the practice of developing projects. We bring up the settling scheme of some shortcomings in them.The system designed and realized communication protocols including 101 protocol and CDT protocol communication modes including serial communication and network communication GUI software modules etc, by using the modularized programming method. Finally, the paper realized protocol conversion, four remote processes including remote measuring, remote information remote adjusting and remote controlling, communications including serial communication and network communication, local supervising- controlling etc.The paper is finished in the KD JC technology limited company, based on the practice of developing projects.