Research Of A Remote Measuring & Controlling Terminal Based On Embedded RTOS

The remote measuring and controlling terminal based on embedded real-time operating system (RTOS) discussed in this paper is a field control terminal system with the background of the railroad supply water system, and according to the embedded system design principle.In this paper the design scheme of the remote measuring and controlling terminal is presented, and its functions of all parts are described in detail, which uses Winbond's W77E58 as its MCU. The peripheral circuits of the terminal—display, keyboard, data collection, switch output, serial interface, are introduced. The real-time kernel ofμC/OS-II, which is a kind of real-time operating system, is introduced. Through analysis and research of source codes ofμC/OS-II, the kernel is known well. And the transplant plan is given based on W77E58 MCU. On these bases, the I/O devices are discussed in detail. To every device, we discuss their realization based onμC/OS-II.Additionally, the communication method of the remote measuring and controlling terminal is introduced in this paper. Making use of the RS485/ Ethernet converter, the terminal realizes long-range measure and control communication function.It may be applied not only in the railroad supply water system, but also in the electric power, water conservancy, petroleum, chemical engineering, etc. It is used in the bad geography environment and unmanned guard remote control system. It has widespread application and practical value.