Digitalized measuring signal is processed in the at89c52 single chip that is the core chip of the inferior subsystem , and the measuring result is obtained , then it is transmitted to the superior subsystem through the serial - parallel interface of single chip 数字测量信号在下位机系统的核心处理芯片at89c52中计算后,得到测量结果,再经串口送入上位机系统显示。本文的最后一章论述了上位机系统的硬件结构和软件程序。
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。
The most important project of the study on high speed solid - state storage technique with compactflash card array is the design of parallel interface unit , which consists of two pieces of isplsi 3448 , one piece of isplsi 3448 realizes 4 - route branching , totaling to realize 8 - route branching 并行接口单元设计包括两部分,一部分是cf卡读写的实现,另一部分是并行分路的实现,并行接口单元由两片isplsi3448组成,每片实现分四路,共分八路。
Comparing with the traditional parallel interface chips , they have fewer legs ~ smaller volume and use fewer resources . therefore , multiple channel data selecting controls keyboar & . display and alarm are realized through at89c52 ? four eight - bit i / o interface , without extending other i / o interface , making the system simplified and reliability increased 单片机的i / o接口芯片全部采用最新的串行工作方式接口芯片,与传统的并行接口芯片相比,它们引脚数少,体积小,占用的口资源少,因此用at89c52的4个8位的i / o口就完成了多个通道的数据采集、控制、键盘、显示和报警等功能,没有扩展其它i / o接口,使系统接线简化,可靠性提高。
1284 - 1994 improves the rate of data transfer of parallel interface greatly and provides bi - directional data transfers it makes the demand for data is no more the bottleneck of peripheral performance at the same time , due to the characteristic of bi - directional data transfer , the host can identify the mode of peripheral sc the problem of mistake operation on unsupported device can be avoided Ieee1284 - 1994标准使并行接口的数据传输速度得到了极大的提高,并且支持双向数据传输。这使得对数据的需求量不再成为外设的性能瓶颈,同时由于双向数据传输特性,所以主机能识别外设的型号,这样就不至于对不支持的设备误操作。
8051 processor testing system was designed to test the sample in 16 bits parallel interface . because of the limitation of the testing system interface , however , easyarm2131 based on arm7tdmi - s was selected to use in 18 bits parallel interface test . and it sufficed the higher bits parallel interface test such as 18 bits , 24 bits , or more , while 8051 testing system ca n ' t do 为测试16bit并行接口,设计了以8051芯片为处理器的测试机;在测试18bit并行接口时,由于8051测试机的接口限制,采用了基于arm7tdmi - s核的easyarm2131开发板系统,解决了8051无法满足18bit乃至以后可能用到的24bit甚至更高的并行接口问题。
6 . automatic judgment of order of priority : during the installation of kit , microdog v3 . 4 needs not choose the order of priority of access to dog hardware , obj will automatically identify the types of softdogs usb interface dog or parallel interface dog , thus increasing the speed of running of encryption software 14不再支援dos win16模组客户研发人员开发时注意事项: 1此版本的软体不相容pmh以及以前型号的并口狗,部分相容umc硬体convert函数不支援,其馀函数都支援。
According to the designing requirement of relay protection , the paper analyses the bad handling ability of single a / d converters , the conflict between high speed and high precision of vfc , low precision in inside a / d of mc9s12dg256 , then brings forward the ad7890 which include multi - path switches , track / hold and a / d circuits . in addition , the traditional digital output circuit consists of parallel interfaces . photo - electricity segregation and middle relays , which are complex and low reliable 传统的开关量输出电路结构一般由并行接口、光电隔离和中间继电器组成,光祸多,电路复杂,可靠性差,我们采用mc33291作为开出接口芯片,大大提高了保护动作的可靠性,提高了驱动能力, mc33291的sp工接口也简化了开出电路,减少了pcb板面积。
The function of the software use pc - computer to dispose the output signal which is produced by the device as following steps : ( 1 ) to input data by parallel interface ( 2 ) to record and form a file ( 3 ) to demonstrate results step by step ( 4 ) the results could be compiled ( 5 ) it can synthesis in the permitted error scope , substituted original dot for line or arc , finally we could get a graph that is described by some simply curve . ( 6 ) to convert these graph into a program , which used in the cutting process of numerical control . ( 7 ) the software also includes some protective methods 而系统处理软件的作用是:利用pc兼容机,将上述装置的输出信号( 1 )通过并行口输入( 2 )记录成文件( 3 )逐点显示出来( 4 )可人工进行化简,编辑(删、改点)等( 5 )可在给定误差范围内进行人工拟合,用直线和圆弧取代原来的点,得到一个与原图形的误差在规定范围内,又消除跟踪过程中因受到各种干扰而造成的缺陷,由尽可能少而简捷的数学曲线描述的图形( 6 )把这些图形转化成用于编制数控线切割加工程序及autocad能够识别的文件(主要指dxf格式) ( 7 )该软件还有一定的加密措施。