食堂磁卡售饭系统窗口机的设计.doc

食堂磁卡系统窗口机的设计 摘 要 。介绍了一种针对双频相位相干编码的食堂磁卡读写窗口机系统。此窗口机系统具有磁卡信息的读入及数据传送、财务管理、键盘输入与帐户余额显示等功能包括窗口机的硬件和软件设计。MRON公司生产的MCR译码器对磁卡进行译码，用RS485串行口通信与上位机进行数据传送，通过INTEL公司的8255通用可编程并行接口芯片完成键盘输入与余额显示等功能控制。软件的设计包括主程序、磁卡信息读取、正反向划卡数据处理、卡码校对、8255键盘输入处理及显示功能控制等程序设计方案及主要程序介绍。该系统具有功能齐全，设计简单，可靠性强，成本低廉等特点，用于具有相对固定就餐人员的中、大型食堂，用于超市等。 关键词：磁卡MCR译码 键盘与显示 Design of the Window-Machine for the Magcard Meal-Selling System in a Dining Room Abstract With the number of student increases greatly, and the management of students information is so complex that could not be conveniently managed in the original papery,. Therefore, more and more colleges build campus dining room management system, using contactless Magcard and network technology. As a developing trend, this technique will be extended widely in school and other organization. It introduces one kind of reading-writing window machine system to the magcard encoded by double frequency phase coherent code. This window machine system has functions of magcard information reading-in, data transferring, financial management, keyboard entry, display of account function and so on, including window machine hardware and software design. The hardware part takes ATMEL company’s AT89C51 chip as a core, uses the MCR decoder produced by Japanese OMRON Corporation to decode magcard, carries on the data transfer with position-on machine by the RS485 serial communication, completes the controlling function of display of keyboard entry and account with INTEL Corporation’s 8255 general programmable parallel interface chip. The software design includes the main procedure, magcard information reading-in, card data processing pro and con, the card code coordinated programming, 8255 keyboards entry dealing and display function controlling. This system has the character of fine and reliable functions, simple design and inexpensive cost. It’s practical in the large-scale or mid-scale canteens that have relatively stable eaters, also practical in supermarket and so on. Key wo