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          <div class="bt_text_y"><span><a href="/">首页</a> > <a href="/article.html">技术文章</a> > 巨鼎天衡供应网络接口tcp/ip协议的电子秤</span></div>
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       	  <div><h1>巨鼎天衡供应网络接口tcp/ip协议的电子秤</h1></div>
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  　更新时间：2021-09-27　点击量：<span id="Click">1905</span>
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          <p><strong></strong></p><p style="text-align: center"><img src="https://img66.chem17.com/2/20200528/637262749853880251636.jpg" style="max-width:800px;max-height:300%;"/></p><p style="text-align: center"><img src="https://img70.chem17.com/2/20200627/637288463881551193517.jpg" style="max-width:800px;max-height:300%;"/></p><p style="text-align: center"><img src="https://img71.chem17.com/2/20200627/637288463938491193479.jpg" style="max-width:800px;max-height:300%;"/></p><p style="text-align: center"><img src="https://img68.chem17.com/2/20200627/637288464031311193144.jpg" style="max-width:800px;max-height:300%;"/></p><p style="text-align: center"><img src="https://img70.chem17.com/2/20200627/637288464099951193204.jpg" style="max-width:800px;max-height:300%;"/></p><p style="text-align: center"><img src="https://img71.chem17.com/2/20200528/637262749528227256374.jpg" style="max-width:800px;max-height:300%;"/></p><p style="text-align: center"><img src="https://img48.chem17.com/2/20180816/636700251579569617195.jpg" style="max-width:800px;max-height:300%;"/></p><p style="text-align: center"><img style="max-width:800px;max-height:300%;" src="https://img76.chem17.com/9/20210906/637665201374917261151.jpg" alt="637665201374917261151.jpg"/><strong>巨鼎天衡供应网络接口tcp/ip协议的电子秤</strong></p><p><span>ModBus/TCP通信协议介绍：</span></p><p><span>&nbsp; &nbsp; ModBus/TCP协议是基于管理和控制自动化设备的ModBus系列通信协议的衍生协议。该协议定义了在一个使用TCP/IP协议的Intrannet或Internet环境中，如何传输ModBus报文。这种协议主要用在PLC、I/O模块、连接其他简单总线或I/O网络的网关的以太网适配器上。</span></p><p><span>&nbsp; &nbsp; ModBus/TCP协议是面向连接的协议，一个连接可以承载多个*立的事务。而UDP协议是一种面向非连接的协议，它不能实现对一个事务的持续控制。另外，由于TCP协议允许有很多个连接同时存在，所以在大多数情况下,ModBus/TCP连接的个数是由连接的发起端根据需要而定的。TCP协议应用在可靠性要求高的场合，而UDP协议则应用在可靠性要求低、传输经济的场合。对于工业控制领域，对可靠性、实时性要求很高。因此，在基于ModBus的以太网协议中，没有采用UDP协议，而采用了TCP协议。</span></p><p><span>&nbsp; <strong style="white-space: normal;">巨鼎天衡供应网络接口tcp/ip协议的电子秤</strong></span></p><p><span>&nbsp; 本项目在ModBus网络中，通过以太网和服务器实现了远程网络通信。对于由ModBus协议组网，适用于由单个主节点和众多从节点的通信网络。上位机作为主节点，现场设备作为从节点。上位机通过轮询的方式依次读取下位机的实时数据，起到控制整个网络的作用。这种通信方式可以提高整个网络的可靠性，避免网络上不同节点之间数据发生冲突。</span></p><p><span>&nbsp; &nbsp; 实践证明，这种架构满足工控的实时性要求。这种ModBus工业网络还有传输距离远的优点，可在任何有网络的地方实现远程监控功能；而且可利用现有网络设施，无需额外投资建设网络，，实施成本低；通用性强,可应用于各种需要通过网络实现实时监控功能的设备。</span></p><p><span>TCP/IP协议：</span></p><p>&nbsp;实现了五层协议。</p><p><span>&nbsp; &nbsp; （1）物理层：对应OSI的物理层。</span></p><p><span>&nbsp; &nbsp; （2）网络接口层：类似于OSI的数据链路层。</span></p><p><span>&nbsp; &nbsp; （3）Internet层：OSI模型在Internet网使用前提出，未考虑网间连接。</span></p><p><span>&nbsp; &nbsp; （4）传输层：对应OSI的传输层。</span></p><p><span>&nbsp; &nbsp; （5）应用层：对应OSI的表示层和应用层。</span></p><p><span>&nbsp; &nbsp; 串行通信协议</span></p><p><span>&nbsp; &nbsp; 串行通信协议分同步协议和异步协议。</span></p><p><span>&nbsp; &nbsp; （1）异步通信协议的实例——起止式异步协议</span></p><p><br/></p><p><br/></p><p><br/></p> 
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