按键输入的英文

例句与用法

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1. 6 modes 10 khz high speed counters 4 modes interrupt inputs timer interrupt processing
   内建12 x 4 lcd显示与8个按键输入阶梯程序。
2. Displays a virtual keyboard so you can enter information by using a pointing device , such as a mouse or a switch input device
   显示一个虚拟键盘，以便可以通过指针设备（例如，鼠标或单一按键输入设备）输入信息。
3. Plc , robot and cad / cam are called the three major pillars in the modem factory automation . plc , as the head of the three , has become the leading basic automatic equipment in the field of the industry control in the early 1980s " but as a matter of fact , plc being with the lack of friendly man machine interface , rnakes no close relationship between human and machineometimes it even can not be promoted and applied in some fields aiming at the situation mat those imported products are too expensive while domestic products are of rare famous brands , a plc man - machine interface - plc monitor is developedthis paper systemically introduces the developing procedure for the whole system , including how to design hardware and software system . especially emphasizing plc communication protocol . real time message accessing , lcd controller instruction set , definition of data construction for message & tag screens and how to display thern , assignment of internal resource of cpuealization in software among plc & manitor , file format defining a nd download of user data , etcplc monitor will compensate some weakpoints of plc , and extend the application rangeimultanneously enhance the performance of plc and increase the attached value of mechanical machines , undoubtedly it will see hight market prospect
   针对人机界面进口产品的高昂价格和国产品牌稀少的这一现状，研制开发了一种plc人机界面? plc监控器。本文系统地介绍了整个系统的开发过程，包括硬件系统、软件系统的设计及实现，重点介绍了plc通信协议，监控器的基本工作原理以及期望实现的功能，监控器电源电路、 sram存储器掉电保护电路、 cpu监控器电路、按键输入电路的设计及按键状态的读入，时钟信息的设定与读取， cpu液晶显示器指令系统，信息画面及标签数据结构的定义及显示方法， cpu内部资源的分配，监控器与plc通信的软件实现，文件格式的定义以及画面数据的下载等。 plc监控器弥补了plc一些方面的不足，可以扩大plc的应用范围，提升机械设备的档次，增加设备的附加价值，具有一定的市场前景。
4. Then the paper analyzes control system of hybrid active power filter , the way of harmonic detecting and the principle of control system , digital low pass filter and the generation of pwm , on the base of which the paper designs a new parallel hybrid active power filter which is controlled by tms320lf2407 , and detailedly introduces drive circuit of pwm , sampling circuit of current , voltage adjustment and protection circuit , communication circuit , liquid crystal display circuit
   分析了混合型有源滤波器的控制系统、谐波检测方法及控制原理、数字低通滤波器和pwm信号的产生,在此基础上设计了一种基于tms320lf2407为控制核心的并联混合型有源电力滤波器硬件原理图。并对pwm驱动电路、电流采样电路、电压调整、按键输入和保护电路、通信模块、液晶显示模块进行了较详细的分析说明。