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title_diff: "[{\"diffs\":[[1,\"RS232接口與RS485的不同之處\"]],\"start1\":0,\"start2\":0,\"length1\":0,\"length2\":18}]"
body_diff: "[{\"diffs\":[[1,\"<html>\\\r\\\n<head>\\\r\\\n  <title>RS232接口與RS485的不同之處</title>\\\r\\\n  <basefont face=\\\"微软雅黑\\\" size=\\\"2\\\" />\\\r\\\n  <meta http-equiv=\\\"Content-Type\\\" content=\\\"text/html;charset=utf-8\\\" />\\\r\\\n  <meta name=\\\"exporter-version\\\" content=\\\"YXBJ Windows/608924 (zh-CN, DDL); Windows/10.0.0 (Win64); EDAMVersion=V2;\\\"/>\\\r\\\n  <style>\\\r\\\n\\tbody, td {\\\r\\\n\\t  font-family: 微软雅黑;\\\r\\\n\\t  font-size: 12pt;\\\r\\\n\\t}\\\r\\\n  </style>\\\r\\\n</head>\\\r\\\n<body>\\\r\\\n<a name=\\\"19345\\\"></a>\\\r\\\n<h1>RS232接口與RS485的不同之處</h1>\\\r\\\n\\\r\\\n<div><span>\\\n  <div style=\\\"--en-clipped-content:simplified; --en-clipped-source-url:https://twgreatdaily.com/GOAzAWwBmyVoG_1ZHDFs.html; --en-clipped-source-title:RS232接口與RS485的不同之處;\\\">\\\n<div><br/></div><div style=\\\"min-height: 3860px; font-size: 16px; display:block; min-width: 100%;\\\"> <div style=\\\"background-color:transparent;font:inherit;vertical-align:baseline;\\\"><div style=\\\"background-color:transparent;font:inherit;vertical-align:baseline;font-family:&quot;PT Serif&quot;;font-size:16px;line-height:1.5em;color:rgb(31, 9, 9);text-align:left;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;width:36em;z-index:200;padding-left:2em;padding-right:2em;margin-left:auto;margin-right:auto;position:relative;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;position:relative;margin-left:-25px;margin-right:25px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;padding-top:0px;padding-bottom:9em;position:relative;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;position:relative;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><h1 style=\\\"font-family:&quot;PT Serif&quot;;text-align:left;border:0px;font:inherit;vertical-align:baseline;font-size:35px;font-weight:normal;line-height:35px;margin-bottom:20px;padding:0px;margin:0px;\\\">RS232接口與RS485的不同之處</h1><div style=\\\"padding:0px;border:0px;font:inherit;vertical-align:baseline;position:relative;height:1em;line-height:1;text-align:center;margin:0px;padding-top:1.5em;padding-bottom:1.5em;margin-bottom:0px;\\\"><div style=\\\"padding:0px;border:0px;font:inherit;vertical-align:baseline;background:-webkit-linear-gradient(0deg, rgb(243, 242, 238) 1%, rgb(31, 9, 9) 50%, rgb(243, 242, 238) 99%);position:absolute;left:-4em;top:50%;z-index:10;width:100%;padding-left:4em;padding-right:4em;height:0.1em;opacity:0.5;margin:0px;margin-bottom:0px;\\\"><span style=\\\"font:inherit;position:absolute;left:-4em;top:50%;z-index:10;width:100%;padding-left:4em;padding-right:4em;height:0.1em;margin:0px;opacity:0.5;background:-webkit-linear-gradient(0deg, rgb(243, 242, 238) 1%, rgb(31, 9, 9) 50%, rgb(243, 242, 238) 99%);\\\"></span></div></div></div><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">\\\n2019-07-17     <a href=\\\"https://twgreatdaily.com/author/Pheenet%E8%8F%B2%E5%B0%BC%E7%89%B9\\\" style=\\\"color:rgb(6, 85, 136);margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;text-decoration:none;\\\">Pheenet菲尼特</a></div><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">RS232與RS485一直是弱電常見的接口，很多朋友提到他們之間的區別，那麼今天我們一起來了解下它們。</p><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;text-align:center;margin-top:1em;margin-bottom:0px;\\\"><img src=\\\":/864fbba4aa6a4cf883eaa1e3d3a75022\\\" type=\\\"image/jpeg\\\" data-filename=\\\"yBDsYGwBUcHTFCnfU4I9.jpg\\\" height=\\\"306\\\" style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;max-width:100%;\\\" width=\\\"576\\\"/></div></div></div></div><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">一、接口的物理結構</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">1、RS232接口：</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">計算機通訊接口之一，通常 RS-232 接口以9個引腳 (DB-9) 或是25個引腳 (DB-25) 的型態出現，一般個人計算機上會有兩組 RS-232 接口，分別稱為 COM1 和 COM2。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">連接器使用型號為DB-25的25芯插頭座。一些設備與<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">PC機</strong>連接的<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">RS-232接口</strong>，因為不使用對方的傳送控制信號，只需三條接口線，即「發送數據」、「接收數據」和「信號地」。所以采DB-9的9芯插頭座，傳輸線採用屏蔽雙絞線。</p><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;text-align:center;margin-top:1em;margin-bottom:0px;\\\"><img src=\\\":/3fc338a2265c422e9c7787a81380c9b4\\\" type=\\\"image/jpeg\\\" data-filename=\\\"zhDsYGwBUcHTFCnfVIKb.jpg\\\" height=\\\"227\\\" style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;max-width:100%;\\\" width=\\\"277\\\"/></div></div></div></div><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;text-align:center;margin-top:1em;margin-bottom:0px;\\\"><img src=\\\":/27801e4645d24688891276a48194d6ed\\\" type=\\\"image/jpeg\\\" data-filename=\\\"0hDsYGwBUcHTFCnfWILR.jpg\\\" height=\\\"479\\\" style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;max-width:100%;\\\" width=\\\"445\\\"/></div></div></div></div><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">2、RS485</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">RS485無具體的物理形狀，根據工程的實際情況而採用的接口</span>。</p><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\"><div style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;text-align:center;margin-top:1em;margin-bottom:0px;\\\"><img src=\\\":/d86a8f8a5d1e4980965b23d706007c36\\\" type=\\\"image/jpeg\\\" data-filename=\\\"1RDsYGwBUcHTFCnfWYLO.jpg\\\" height=\\\"253\\\" style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;display:block;max-width:100%;\\\" width=\\\"576\\\"/></div></div></div></div><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">二、接口的電子特性</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">1、RS232：傳輸電平信號</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">接口的信號<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">電平值較高</strong>(信號「1」為「-3V至-15V」,信號「0」為「3至15V」)，易損壞接口電路的<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">晶片</strong>，又因為與TTL電平(0~「&lt;0.8V」,1~「&gt;2.0V」)不兼容故需使用電平轉換電路方能與TTL電路連接。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">另外<span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">抗</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">干擾能力差</span></strong>。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">2、RS485：傳輸差分信號</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"> 邏輯「1」以兩線間的電壓差為+（2—6） V表示；邏輯「0」以兩線間的電壓差為-（2—6）V表示。接口信號電平比RS-232降低了，就不易損壞接口電路的晶片，且該電平與TTL電平兼容，可方便與TTL電路連接。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">  <strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">抗干擾能力強</span></strong>。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">三、通訊距離長短</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">1、RS232：</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">RS232傳輸距離有限，最大傳輸距離標準值為</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">15米</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">，且只能</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">點對點</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">通訊，最大傳輸速率最大為</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">20kB/s</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">。</span></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">2、RS485：</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">RS485最大無線傳輸</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">距離為1200米</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">。最大傳輸速率為10Mbps，在1</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">00Kb/S</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">的傳輸速率下，才可以達到最大的通信距離。</span></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">採用阻抗匹配、低衰減的專用電纜可以達到1800米！超過1200米，可加<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">中繼器</strong>（最多8隻），這樣傳輸距離接<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">近10Km</strong>。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">四、能否支持多點通訊</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">RS232</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">：RS232接口在總線上只允許</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">連接1個收發器</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">，不能支持多站收發能力，所以只能點對點通信，</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">不支持</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">多點通訊。</span></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">RS485：</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">RS485接口在總線上是允許連接</span><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\"><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">多達128個收發器</span></strong><span style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;background-color:rgb(234, 226, 96);transition:background-color 0.4s ease 0s;color:black;font-weight:inherit;font-style:unset;-evernote-highlight:true;\\\" title=\\\"点击以取消高亮显示\\\">。即具有多站通訊能力，這樣用戶可以利用單一的RS485接口方便地建立起設備網絡。</span> </p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">五、通訊線的差別</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">RS232：</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">可以採用三芯雙絞線、三芯屏蔽線等。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">RS485：</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">可以採用兩芯雙絞線、兩芯屏蔽線等。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">在低速、短距離、無干擾的場合可以採用普通的雙絞線，反之，在高速、長線傳輸時，則必須採用阻抗匹配（一般為120Ω）的RS485專用電纜（STP-120Ω（用於RS485 &amp; CAN）一對18AWG），而在干擾惡劣的環境下還應採用鎧裝型雙絞屏蔽電纜（ASTP-120Ω（用於RS485 &amp; CAN）一對18AWG）。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\"><strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">補充：</strong></p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">這裡面弱電君補充下。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">即然RS232傳輸距離只有15米這麼短，那麼他有什麼<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">作用</strong>呢？</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:1.5em;\\\">其實它的應用非常<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">廣泛</strong>，可以連接各種設備，例如<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">監控</strong>、其它的設備升級或調試、、、都可能需要用到它。功能與<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">usb</strong>比較接近，隨著USB埠的越來越普遍，將會出現更多的把<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">USB轉換成RS-232</strong>或其它接口的轉換裝置。</p><p style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;margin-bottom:0px;\\\">通過USB接口可<strong style=\\\"margin:0px;padding:0px;border:0px;font:inherit;vertical-align:baseline;font-weight:bold;\\\">連接</strong>更多的RS-232設備，不僅可獲得更高的傳輸速度，實現真正的即插即用，同時解決了USB接口不能遠距離傳輸的缺點(USB通訊距離在5米內）。</p></div></div></div></div></div></div></div></div></div></div>\\\n</div>\\\n</span>\\\n</div></body></html>\\u0000\"]],\"start1\":0,\"start2\":0,\"length1\":0,\"length2\":22471}]"
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updated_time: 2025-11-28T16:12:56.063Z
created_time: 2025-11-28T16:12:56.063Z
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