毕业设计（论文）-某中小企业监控系统的设计与实施精选.doc

摘 要 随着互联网技术的发展，网络已经渗透到了控制系统的控制层和设备层。大量的楼宇现场设备主要通过串行口、CAN和USB总线进行通信，但因其不具备网络接口，以至无法直接接入互联网。本文论证了采用FPGA构建片上系统，并移植操作系统，在操作系统上完成协议转换的方案；设计了以EP2C35F672为核心的硬件平台，实现了串口到以太网的协议转换，完成了基于监控中心和用户的远程安全监控。通过验证，整个系统运行稳定，可靠性好。 本文首先给出了整个系统的方案设计和系统组成，并进行方案论证。然后简要介绍了CAN、USB；硬件部分描述了RS-232、RS-485、CAN和USB接口电路设计，在核心器件EP2C35F672上构建片上系统——NiosⅡ系统；软件部分描述了移植操作系统的整个过程，并给出了应用程序流程图及关键代码。最后对串口转以太网的实验作出分析及展望。 关键词：EP2C35F672；串口；TCP/IP；uClinux操作系统 ABSTRACT With the development of the Internet technology, the network has penetrated into the control layer and equipment layer of the control system. A large number of building site equipment through the serial port, CAN and USB bus communication, but because it does not have a network interface, and can not be directly connected to the internet. This paper demonstrates the construction of system on chip using FPGA, and transplant operating system, complete the protocol conversion program in the operating system; the design of the hardware platform based on EP2C35F672, realize the serial to Ethernet protocol conversion, Cheng Anquan completed the remote monitoring center and the user based on monitoring. Through verification, the whole system is stable and reliable. In this paper, the design of the whole system and the composition of the system are presented. Then a brief introduction of CAN and USB; the hardware part describes the RS-232, RS-485, CAN and USB interface circuit design, construction of the system on chip Nios II system in the core of the device EP2C35F672; the software part describes the whole process of porting operating system, and gives the application flow chart and key code. Finally, the paper analyzes and prospects the serial port Ethernet experiment. Keywords: EP2C35F672；serial port；TCP/IP；UClinux 目 录 摘 要 I ABSTRACT II 1 绪论 1 1.1 研究背景及意义 1 1.2 研究现状 1 2 项目概况 2 3 硬件设计与实现 3 3.1RS-232接口电路设计 3 3.2RS-485接口电路设计 4 3.3CAN接口电路设计 5 3.4USB接口电路设计 6 3.5网络接口 7 3.6安防监控系统硬件集成 8 3.7 出入口控制系统硬件集成 10 3.8入侵报警系统硬件集成 11 3.9安防集成系统整体硬件架构 12 4系统集成的设计与实现 1