基于NMEA2000的罗经复示器设计 自动化专业毕业论文.doc

基于NMEA2000的罗经复示器设计 专业班级：08级自动化3班 姓 名： 指导教师： 信息科学技术学院摘 要 如今罗经越来越受到各国专家学者的重视，罗经传输的误差引起的航向的偏离，不仅导致船舶航向偏离所引起的燃料的浪费，甚至会引起船舶的相撞，导致重大的生命和财产损失。甚至对海洋的生态和环境都构成了严重的污染以及威胁。 本设计就是针对使罗经的数据能快速准确地反映到仪表盘上，为航向的决策提供正确的保障。主要内容包括：基于89C51和X5045的单片机最小系统的设计；基于SJA1000的控制电路的设计；基于CAN总线收发器82C250的电路设计；基于ZLG7290的循环显示电路的设计。 根据电气主线设计应满足可靠性、灵活性、经济性的要求。本设计所用的SJA1000为PHILIP公司生产的控制局域网的高速集成的独立通信控制器， 82C250 是CAN 协议控制器和物理总线的接口这个器件对总线提供不同的发送能力和对CAN控制器提供不同的接收能力。介绍了控制器和收发器及看门狗X5045的特点、使用方法、内部结构、以及开发程序，说明一种应用于船体的罗经通讯的CAN收发电路的设计和开发，探讨应用中需要注意的一些问题。 本设计运用国内主流CAN独立控制器PHILIP公司生产的SJA1000和82C250，实用性强，使用范围广，器件容易买到，经济性好，编写的程序稍加改动就可以应用到实际工控中。 关键词：CAN总线；控制器；收发器 ABSTRACT Nowadays study on the communication of compass is increasingly attract the attention of national experts and scholars, the departure of course because of the transporting error of the compass not only leads to the waste of the fuel, but also threaten human life and caused great losses on the property, even do the marine ecology and the environment constitute severe pollution, and threats. The main design elements includes: the design of the smallest single-chip system by AT89C51 and X5045;the design of the control circuit by SJA1000;the design of the circuit by 82C250,the transceiver of the CAN communication; the design of the display circuit of LED by ZLG7290. According to the main line of electrical design should meet the reliability, flexibility, economy requirements. The design uses SJA1000, the independent controller and 82C250, the port circuit of the CAN Bus and the independent controller. They all the products from the PHILIP corporation. To introduce the characters of the controller, the transceiver and the watch dog, including usage method, inner structure, the development procedure. Press on the design of the communication used to the Compass by CAN Bus and some problems would happened in the design. The design is using the popular independent controller and the transceiver made by PHILIP. The development procedure can be transp