By the advantage of high precision , strong anti - interference ability , long lifespan , etc , grating scale is the chief sensor in displacement measurement . however , as is restricted by the beam path structure , the scan frequency of the scaning circuit , etc , the maximum available measuring speed has a inverse proportion relationship to the measuring pace of a single grating scale 光栅尺具有精度高、抗干扰能力强、寿命长等优点,成为微纳米位移测量的主要工具,但由于受光路结构及信号检测电路扫描频率等因素的限制,单个光栅尺测量的最大允许移动速度与其测量步距成反比。
On the one hand of hardwar : first of all , the thesis introduces the interiror structure of pic18f8260 and its distinguishing with other singlechip ; secondly , having narrated the structure and performance of gsm communicate module - tc35i module and the hardware performance process of communications interface of gsm ; thirdly , having studied the drived principle and dynamic scanned circuit of led ’ s panel ; lastly , having put forward serial interface circuit which the application of system . on the other hand of software which have accomplished the running of hardware : in design , utilizing mscomm control to realize the serial communication between computer and cell phone , utilizing at command to realize the cell phone control and sms receiving and sending operation , the pdu ( protcol data unit ) 设计上,利用mscomm控件实现计算机与gsm模块间的串口通信,使用at指令实现对gsm模块的各种控制和短信的收发,分析发送和接收短消息的pdu ( protcoldataunit )格式、短信内容、手机号码、 smsc (短消息服务中心)号码等;单片机与pc机之间的通信采用pic中c语言和c + +语言编程,以中断方式实现pic18f8260与led的通信,同样利用mscomm控件从汉字字库的提取点阵码,最后显示在led上。