| With the development of electronics, communications and computers, Remote Terminal Unit (Abbreviation:RTU) is widely used in the water, electricity, petroleum, transportation and other industries applications.The function and performance of the RTU needs to be improved.Therefore, it is necessary to develop the flexible and adaptive RTU based on the application of advanced technology [1].In this paper the current situation and development trend of RTU is introduced.Because of the disadvantages of traditional RTU,such as single function ,simplex communication and inflexibility, combined with embedded microprocessors and embedded operating system development and application in the control area, the design of high performance and multi-purpose RTU is put forward based on the Embedded Linux and ARM9.According to the functional requirements of RTU, S3C2440 microprocessor is chosen as the hardware platform,while embedded Linux operating system is used as the software platform.In this paper, it is designed based on the sub-module in the design of hardware.There are some modules, including data acquisition, power management, communication, storage modules and other circuits.Digital input and output interface is designed in the part of data acquisition. Some power management system is designed not only to supply power, but also to reduce system power consumption.When some of the external circuits do not work, it needs to cut off the power supply by the power control circuit. In order to meet a variety of communications more communications were designed, such as CAN bus, RS232, RS485, Ethernet, GPRS, shortwave radio, MODEM and GSM. In Memory module the Flash and SDRAM interface circuit is designed to meet the more requirements.Software design consists of porting the operating system and developing application.In this paper, porting the operating system and application have been studied.At the end of this paper, the design is summarized and the future research is put forward. |
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