Usb Infrared Meter Design

It's an effective way to adjust needs and supply to a balance between consumer and electrical power plant by scientific management, Using multi-rates power meter is one of the way. Multi-rates power meter, portable meter controller and meter management OS all three parts together consist the multi-rate meter system. Design communication interface of the portable meter controller is my mainly work. I explain USB architecture and compare several industrial buses and interfaces, introduce the advantages of USB if used in instruments. The thesis then will talk about how to design the portable meter controller, including:device hardware,device software,and host software. Then, the thesis explains the system hardware development, the USB chip PDIUSBD12 is described and the hardware cell is presented.The next chapter is the most important in the thesis and firmware is the kernel of USB program. I mainly worked at it. This chapter discusses the state of USB device, general USB device manipulation and standard device request. The firmware design flow chart is given and some important prgram is explained.The device driver and application program are presented in the last three chapters, WDM, VC, and DLL are used to develop the driver and application program.There exists a contradiction between transfer speed and system resources possessed by interface when using traditional serial interface(RS232,RS485) or Parallel interface as the interface between memory and PC controlled by MCU. The system always transfers data via MCU and occupies lots of CPU's time. The transfer is very inefficient. Universal serial Bus (USB) provides a new method for data transfer that is different from traditional MCU system. Using USB and DMA mode, the data transfer is more effective, economic, faster and convenient than traditional method.At the end of the thesis, I talk about some shortcomings of my USB research, and expect USB used in industrial control and instrument.