The Design and Research of new cable anti-theft stategy

近年来，随着国民工业的发展，对金属资源的需求大大提高，从而导致了各种金属资源的供应紧张，其价格也逐步上升，电缆由于其含铜量高，分布分散，无人值守等特点，逐渐受到偷盗者的关注，造成了很大的社会隐患，尤其是对于大型桥梁的路灯电缆，被盗不仅会给公共事业带来困扰，更会给人民的生命带来严重的威胁。由此产生了各种各样的电力线防盗方法，主要有专业值守人员进行值守巡查，地下铺设以及利用电子仪器进行检测保护等，由于前两种防盗方法存在的缺陷，目前主要采用电子仪器检测法来进行电缆保护。 本文主要介绍一种基于阻抗特征值测量的电缆防盗方法，该方法利用电力系统的阻抗值作为电缆运行状态的主要判断依据，利用基于微分方程的算...In recent years, with the development of national industries, The demand for metal resources greatly increased, These resulted in various metal resources tight supply and its price is rising gradually. The cable is mainly made up of the copper and has been out in the open. For the above reasons, the thieves pay more attention to the cables, and then the electric cables are usually stolen. The burg...学位：工学硕士院系专业：信息科学与技术学院自动化系_检测技术与自动化装置学号：2322008115337

Microcomputer's Data Acquisition Based on Modbus Protocol

详细论述了W77E58与PC机串口通信的硬件接口电路特点以及软件编程方法,设计了数据采集的硬件电路与数据知识基于MOdbuS协议表示的算法。标准MOdbuS协议是当前在工业控制当中使用广泛一种通信协议,而且已经成为一种通用的工业标准。数据采集系统运行稳定,能够准确接收到现场单片机采集的信息,具有一定的实用性。This paper describes the hardware interface circuit and the software programming about the serial communication between the W77E58 and the computer,also designs the hardware circuit of data acquisition and the arithmetic of data tran- scription based on Modbus protocol.The standard Modbus protocol is a communication protocol which is used widely in industrial control,and it has become a universal industrial standard