Ltb - ii microcomputer pedal force apply the brake manually device , mainly used for various motor vehicle hydraulic brake pedal force and hand - size power detection , automatic storage test results is also equipped with rs232 serial interface to facilitate communication with the computer Ii型微电脑踏板力手制动仪，主要用于各种机动车液压制动踏板力及手制动力大小检测，可自动存储检测结果，并配有rs232串行接口，方便与计算机通讯。
The parallel interface used the self - made pci9052data acquisition card , using for the data acquisition in the upper position machine ; the serial interface used the rs232 standard interface , using for the movementcontrolled command transmission between the upper position machine and thelower position machine 并行接口采用自制的pci9052数据采集卡,用于上位机的数据采集;串行接口采用标准的rs232接口,用于上下位机之间运动控制命令的传输。
In this paper , the main works are followed : la cqt dialing and testing system has been developed ; 2 . by using two moxa cards , the rs - 232 serial port is expanded ; 3 . a software of interface and control is programmed , which can accomplish the function of data collection and analysis Cqt拨打测试终端的研制，其中包括测试终端的总体设计、原理图及印刷电路板设计，电路板焊接与调试。 2利用moxa卡对计算机的rs - 232串行接口进行扩展的设计与实现。
Thirdly , according to the working principles of serial peripheral interface spi , it ' s advanced that the data communication of master - slave can be achieved through the i / o interfaces between modules by way of the software ' s following the spi model , thus solving the problem of integrated system 进而根据同步串行接口spi的工作原理，本文提出了通过模块间的i o口连接，用软件模拟spi模式，实现单主机多从机的数据通信，从而方便地解决了仪表系统的集成问题。
It is a fast , bi - directional , isochronous , low - cost , dynamically attachable serial interface that is consistent with the requirements of the pc platform of today and tomorrow [ 1 ] the benefits of usb , such as easy to use , true of plug and play , high performance , and reduced overall system cost , are just a few of the reasons this technology has gone from specification to product development in several years Usb是快速、双向、同步、动态连接且价格低廉的串行接口，可以满足pc机现在和将来发展的需要。 usb作为一种新兴的计算机外设总线标准，从标准的出现到大规模的应用，仅用了短短几年的时间，这一切都得益于它易用、真正的热插拔、高性能和系统造价低廉等优点。
Through program technique on line in combination with usb , the box of ultrasonic flaw detector being controlled and displayed by pc is designed , which not only improves device performance , reduces cost , makes device handy , but also caters for tendency to development of peripheral of pc 通过在线可编程技术及通用串行接口技术的结合应用，把探伤仪外置盒设计成基于pc机控制和显示的仪器，既提高了仪器的性能，降低了成本，又方便了使用，迎合了pc机外围接口设备的发展趋势。
Ab stract the author is engaged in the studying and manufacturing of an intelligent , capable and portable , multifuctional electrocardio monitoring equipment with aduc8 12 single - chip . microcomputer . the equipment can gather and record the electrocardio signals automatically , also can analyse it at real time , and send it out to the monitoring center through the telephone at real time or send it out by serial interfaces to computer . it use the graph display device to show the electrocardio waves and menu . cooperated with buttons , it provides amicable interface , and makes operation simple and convenient . based on the feature of the electrocardio signals , this paper also proposes a electrocardio distortionless data compression algorithm . the algorithn is simple but effective , it can process the data at real time , and the compression - ratio reaches 2 6 所研制的监护仪能长时间采集和记录心电信号，同时可进行心电数据的实时分析，并可通过电话向监护中心实时发送，也可通过串行接口发送至微机。该监护仪采用图形液晶显示器显示心电波形和菜单，配合按键提供友好的人机界面，操作简洁。本文还根据心电波形的特征，提出一种心电数据的无损压缩算法，该算法简单有效，能实时实现，压缩比达到2 6倍。
