基于HART协议的采暖温控装置硬件设计毕业论文.doc

哈尔滨理工大学学士学位论文 PAGE IV - - 哈 尔 滨 理 工 大 学 毕 业 设 计 题 目：基于HART协议的采暖温控装置硬件设计 院 系： 测通学院 测控技术与仪器系 基于HART协议的采暖温控装置硬件设计 摘 要 随着人们对供暖设施的不断要求，随着计算机技术，通信技术的发展，更加智能方便的供暖技术也在不断提高。目前，现场总线已经成为过程控制领域的热点，代表着采暖温控发展的方向。随着现场总线国际标准的完成，现场总线产品以其完善的功能和突出的特点必将为市场所接受。HART协议作为一个开放性的协议，现已成为采暖温控的标准之一。其特点是在现有的模拟信号传输线上实现数字信号通信，属于模拟系统向数字系统转变过程中的过渡产品，因而在当前的过渡时期具有较强的市场竞争能力，得到了较快的发展。 在此背景下，本论文所研究的基于HART协议的采暖温控装置的设计为HART协议在采暖温控领域的应用做了一些有益尝试。对HART协议作了一个较为全面的分析，分别介绍了HART协议三个层次（物理层、数据链路层和应用层）的定义和功能。 本文根据对HART协议的理解以及自己在实践过程中的总结，在论文中对HART协议实现过程中的一些问题做了更进一步的说明和讨论。在设计方案上，基于对实际需求和应用环境的深入分析，采用了“模块化”和“标准接口”的设计思路，使本HART协议通信系统在对原有设备和线路改动很小的情况下用于对传统采暖温控装置进行升级。本文介绍的内容很多都是在系统的实际研发过程中总结获得的，具有较强的针对性和实用性。 关键词 HART协议；温控系统；组成模块 Heating temperature control device based on HART protocol design Abstract With heating facilities requirements, along with the development of computer technology, communication technology, the more intelligent and convenient heating techniques are constantly improved. At present, the field bus has become a hot area of process control, represents the direction of the heating temperature. With the completion of the international fieldbus standard, fieldbus products with improved features and prominent feature is bound to gain market acceptance. HART protocol as an open protocol, which has become one of the standard heating temperature. Which is characterized by the digital signal communications, belonging to the analog system to a transitional product in the transformation process of the digital system, and thus has a strong market competitiveness in the current period of transition, the rapid development in the existing analog signal transmission line. In this context, the heating and temperature control devices studied in this thesis based on HART protocol design to the HART protocol heating temperature field of application of some useful attempt. Made a more comprehensive analysis of the HART protocol, introduces the HART protocol definition of three levels (physical l