{"id":73199,"date":"2026-02-07T08:57:17","date_gmt":"2026-02-07T00:57:17","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/73199.html"},"modified":"2026-02-07T08:57:17","modified_gmt":"2026-02-07T00:57:17","slug":"%e3%80%90modbus%e3%80%91rs-232%e3%80%81rs-485-%e4%b8%8e-rs-422%ef%bc%9a%e9%80%9a%e4%bf%a1%e6%a0%87%e5%87%86%e5%8e%9f%e7%90%86%e4%b8%8e%e5%b7%ae%e5%bc%82%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/73199.html","title":{"rendered":"\u3010Modbus\u3011RS-232\u3001RS-485 \u4e0e RS-422\uff1a\u901a\u4fe1\u6807\u51c6\u539f\u7406\u4e0e\u5dee\u5f02\u8be6\u89e3"},"content":{"rendered":"<h2>\u3010Modbus\u3011RS-232\u3001RS-485 \u4e0e RS-422&#xff1a;\u901a\u4fe1\u6807\u51c6\u539f\u7406\u4e0e\u5dee\u5f02\u8be6\u89e3<\/h2>\n<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u3010Modbus\u3011RS-232\u3001RS-485 \u4e0e RS-422&#xff1a;\u901a\u4fe1\u6807\u51c6\u539f\u7406\u4e0e\u5dee\u5f02\u8be6\u89e3<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001\u57fa\u7840\u6982\u5ff5&#xff1a;\u4ec0\u4e48\u662f RS \u7cfb\u5217\u6807\u51c6&#xff1f;<\/li>\n<li>\u4e8c\u3001\u5404\u6807\u51c6\u7684\u5b9e\u73b0\u539f\u7406<\/li>\n<li>\n<ul>\n<li>1. RS-232&#xff1a;\u70b9\u5bf9\u70b9\u7684\u5355\u7aef\u901a\u4fe1\u6807\u51c6<\/li>\n<li>\n<ul>\n<li>\u6838\u5fc3\u539f\u7406&#xff1a;\u5355\u7aef\u4fe1\u53f7\u4f20\u8f93<\/li>\n<\/ul>\n<\/li>\n<li>2. RS-485&#xff1a;\u591a\u70b9\u534a\u53cc\u5de5\u7684\u5dee\u5206\u901a\u4fe1\u6807\u51c6<\/li>\n<li>\n<ul>\n<li>\u6838\u5fc3\u539f\u7406&#xff1a;\u5dee\u5206\u4fe1\u53f7\u4f20\u8f93<\/li>\n<\/ul>\n<\/li>\n<li>3. RS-422&#xff1a;\u70b9\u5bf9\u70b9\u5168\u53cc\u5de5\u7684\u5dee\u5206\u901a\u4fe1\u6807\u51c6<\/li>\n<li>\n<ul>\n<li>\u6838\u5fc3\u539f\u7406&#xff1a;\u5dee\u5206\u4fe1\u53f7 &#043; \u72ec\u7acb\u6536\u53d1\u901a\u9053<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u4e09\u79cd\u6807\u51c6\u7684\u6838\u5fc3\u5dee\u5f02\u5bf9\u6bd4<\/li>\n<li>\u56db\u3001\u5173\u952e\u5dee\u5f02\u6df1\u5ea6\u89e3\u6790<\/li>\n<li>\n<ul>\n<li>1. \u6297\u5e72\u6270\u80fd\u529b&#xff1a;\u4e3a\u4ec0\u4e48 RS-485\/422 \u8fdc\u4f18\u4e8e RS-232&#xff1f;<\/li>\n<li>2. \u901a\u4fe1\u8ddd\u79bb\u4e0e\u901f\u7387&#xff1a;\u4e3a\u4ec0\u4e48 RS-485\/422 \u80fd\u4f20 1200 \u7c73&#xff1f;<\/li>\n<li>3. \u534a\u53cc\u5de5 vs \u5168\u53cc\u5de5&#xff1a;RS-485 \u4e3a\u4ec0\u4e48\u4e0d\u652f\u6301\u5168\u53cc\u5de5&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u9009\u578b\u5efa\u8bae<\/li>\n<li>\u516d\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u89e3\u51b3\u65b9\u6848<\/li>\n<li>\n<ul>\n<li>1. RS-485 \u603b\u7ebf\u901a\u4fe1\u4e0d\u7a33\u5b9a&#xff1f;<\/li>\n<li>2. RS-232 \u901a\u4fe1\u8ddd\u79bb\u4e0d\u591f&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u603b\u7ed3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p> \u5728\u5de5\u4e1a\u81ea\u52a8\u5316\u3001\u6570\u636e\u91c7\u96c6\u3001\u8bbe\u5907\u63a7\u5236\u7b49\u9886\u57df&#xff0c;\u4e32\u884c\u901a\u4fe1\u662f\u8bbe\u5907\u95f4\u6570\u636e\u4ea4\u4e92\u7684\u6838\u5fc3\u65b9\u5f0f\u4e4b\u4e00\u3002RS-232\u3001RS-485 \u548c RS-422 \u4f5c\u4e3a\u6700\u5e38\u7528\u7684\u4e09\u79cd\u4e32\u884c\u901a\u4fe1\u6807\u51c6&#xff0c;\u5206\u522b\u9488\u5bf9\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u8bbe\u8ba1&#xff0c;\u5728<br \/>\n\u7535\u6c14\u7279\u6027\u3001\u62d3\u6251\u7ed3\u6784\u3001\u901a\u4fe1\u8ddd\u79bb\u3001\u6297\u5e72\u6270\u80fd\u529b\u7b49\u65b9\u9762\u5b58\u5728\u663e\u8457\u5dee\u5f02\u3002\u672c\u6587\u5c06\u4ece \u201c\u5b9e\u73b0\u539f\u7406\u201d \u548c \u201c\u6838\u5fc3\u5dee\u5f02\u201d \u4e24\u4e2a\u7ef4\u5ea6&#xff0c;\u6df1\u5165\u89e3\u6790\u8fd9\u4e09\u79cd\u6807\u51c6&#xff0c;\u5e2e\u52a9\u8bfb\u8005\u7406\u89e3\u5176\u9002\u7528\u573a\u666f\u4e0e\u9009\u578b\u903b\u8f91\u3002<\/p>\n<h3>\u4e00\u3001\u57fa\u7840\u6982\u5ff5&#xff1a;\u4ec0\u4e48\u662f RS \u7cfb\u5217\u6807\u51c6&#xff1f;<\/h3>\n<p>RS&#xff08;Recommended Standard&#xff0c;\u63a8\u8350\u6807\u51c6&#xff09;\u7cfb\u5217\u662f\u7531\u7f8e\u56fd\u7535\u5b50\u5de5\u4e1a\u534f\u4f1a&#xff08;EIA&#xff09;\u5236\u5b9a\u7684\u4e32\u884c\u901a\u4fe1\u63a5\u53e3\u6807\u51c6&#xff0c;\u6838\u5fc3\u4f5c\u7528\u662f\u89c4\u8303\u8bbe\u5907\u95f4\u7684\u7535\u6c14\u8fde\u63a5\u3001\u4fe1\u53f7\u7535\u5e73\u3001\u65f6\u5e8f\u7b49\u53c2\u6570&#xff0c;\u786e\u4fdd\u4e0d\u540c\u5382\u5546\u7684\u8bbe\u5907\u53ef\u4e92\u8054\u4e92\u901a\u3002<\/p>\n<p>\u8fd9\u4e09\u79cd\u6807\u51c6\u5747\u5c5e\u4e8e \u201c\u5f02\u6b65\u4e32\u884c\u901a\u4fe1\u201d&#xff08;\u65e0\u9700\u65f6\u949f\u4fe1\u53f7\u540c\u6b65&#xff0c;\u901a\u8fc7\u8d77\u59cb\u4f4d \/ \u505c\u6b62\u4f4d\u6807\u8bc6\u6570\u636e\u5e27\u8fb9\u754c&#xff09;&#xff0c;\u4f46\u5728 \u201c\u4fe1\u53f7\u4f20\u8f93\u65b9\u5f0f\u201d \u548c \u201c\u786c\u4ef6\u8bbe\u8ba1\u201d \u4e0a\u5dee\u5f02\u5de8\u5927&#xff0c;\u6700\u7ec8\u51b3\u5b9a\u4e86\u5b83\u4eec\u7684\u5e94\u7528\u573a\u666f\u8fb9\u754c\u3002<\/p>\n<h3>\u4e8c\u3001\u5404\u6807\u51c6\u7684\u5b9e\u73b0\u539f\u7406<\/h3>\n<h4>1. RS-232&#xff1a;\u70b9\u5bf9\u70b9\u7684\u5355\u7aef\u901a\u4fe1\u6807\u51c6<\/h4>\n<p>RS-232 \u662f\u6700\u65e9&#xff08;1962 \u5e74\u53d1\u5e03&#xff09;\u7684\u4e32\u884c\u901a\u4fe1\u6807\u51c6\u4e4b\u4e00&#xff0c;\u6700\u521d\u7528\u4e8e\u8ba1\u7b97\u673a\u4e0e\u8c03\u5236\u89e3\u8c03\u5668&#xff08;Modem&#xff09;\u3001\u6253\u5370\u673a\u7b49\u5916\u8bbe\u7684\u70b9\u5bf9\u70b9\u8fde\u63a5&#xff0c;\u81f3\u4eca\u4ecd\u5e7f\u6cdb\u7528\u4e8e\u77ed\u8ddd\u79bb\u3001\u4f4e\u901f\u7387\u7684\u8bbe\u5907\u901a\u4fe1&#xff08;\u5982 PLC \u8c03\u8bd5\u53e3\u3001\u4f20\u611f\u5668\u914d\u7f6e\u53e3&#xff09;\u3002<\/p>\n<h5>\u6838\u5fc3\u539f\u7406&#xff1a;\u5355\u7aef\u4fe1\u53f7\u4f20\u8f93<\/h5>\n<p>\u201c\u5355\u7aef\u901a\u4fe1\u201d \u6307\u4ee5\u516c\u5171\u5730&#xff08;GND&#xff09;\u4e3a\u53c2\u8003&#xff0c;\u901a\u8fc7\u4e00\u6839\u4fe1\u53f7\u7ebf\u4f20\u8f93\u4fe1\u53f7\u7535\u5e73&#xff0c;\u4fe1\u53f7\u7684 \u201c\u9ad8 \/ \u4f4e\u201d \u7531\u4fe1\u53f7\u7ebf\u4e0e\u5730\u4e4b\u95f4\u7684\u7535\u538b\u5dee\u51b3\u5b9a\u3002<\/p>\n<ul>\n<li>\n<p>\u4fe1\u53f7\u7535\u5e73\u5b9a\u4e49&#xff08;EIA\/TIA-232-E \u6807\u51c6&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u903b\u8f91 1&#xff08;MARK&#xff09;&#xff1a;-3V ~ -15V&#xff08;\u8d1f\u7535\u538b&#xff09;<\/li>\n<li>\u903b\u8f91 0&#xff08;SPACE&#xff09;&#xff1a;&#043;3V ~ &#043;15V&#xff08;\u6b63\u7535\u538b&#xff09;<\/li>\n<li>\u65e0\u6548\u7535\u5e73&#xff1a;-3V ~ &#043;3V&#xff08;\u907f\u514d\u566a\u58f0\u8bef\u89e6\u53d1&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5178\u578b\u63a5\u53e3\u5f15\u811a&#xff08;DB9 \u8fde\u63a5\u5668&#xff0c;\u5e38\u7528\u5f15\u811a&#xff09;&#xff1a;<\/p>\n<table>\n<tr>\u5f15\u811a\u53f7\u540d\u79f0\u529f\u80fd\u63cf\u8ff0<\/tr>\n<tbody>\n<tr>\n<td>2<\/td>\n<td>TXD<\/td>\n<td>\u53d1\u9001\u6570\u636e&#xff08;\u4e3b\u673a\u2192\u4ece\u673a&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>RXD<\/td>\n<td>\u63a5\u6536\u6570\u636e&#xff08;\u4ece\u673a\u2192\u4e3b\u673a&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>GND<\/td>\n<td>\u516c\u5171\u5730&#xff08;\u4fe1\u53f7\u53c2\u8003&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>7<\/td>\n<td>RTS<\/td>\n<td>\u8bf7\u6c42\u53d1\u9001&#xff08;\u6d41\u91cf\u63a7\u5236&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>8<\/td>\n<td>CTS<\/td>\n<td>\u6e05\u9664\u53d1\u9001&#xff08;\u6d41\u91cf\u63a7\u5236&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/li>\n<li>\n<p>\u901a\u4fe1\u6d41\u7a0b &#xff1a;<\/p>\n<li>\u4e3b\u673a\u901a\u8fc7 TXD \u5f15\u811a\u53d1\u9001\u4e32\u884c\u6570\u636e&#xff08;\u5e26\u8d77\u59cb\u4f4d\u3001\u6570\u636e\u4f4d\u3001\u6821\u9a8c\u4f4d\u3001\u505c\u6b62\u4f4d&#xff09;&#xff1b;<\/li>\n<li>\u4ece\u673a\u901a\u8fc7 RXD \u5f15\u811a\u63a5\u6536\u6570\u636e&#xff0c;\u4ee5 GND \u4e3a\u53c2\u8003\u89e3\u6790\u7535\u5e73&#xff1b;<\/li>\n<li>\u82e5\u542f\u7528\u6d41\u91cf\u63a7\u5236&#xff08;RTS\/CTS&#xff09;&#xff0c;\u4e3b\u673a\u4f1a\u5148\u53d1\u9001 \u201c\u8bf7\u6c42\u201d&#xff0c;\u4ece\u673a\u5c31\u7eea\u540e\u8fd4\u56de \u201c\u5141\u8bb8\u201d&#xff0c;\u518d\u5f00\u59cb\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<\/li>\n<\/ul>\n<h4>2. RS-485&#xff1a;\u591a\u70b9\u534a\u53cc\u5de5\u7684\u5dee\u5206\u901a\u4fe1\u6807\u51c6<\/h4>\n<p>RS-485&#xff08;1983 \u5e74\u53d1\u5e03&#xff09;\u662f\u4e3a\u89e3\u51b3 RS-232\u201c\u8ddd\u79bb\u77ed\u3001\u6297\u5e72\u6270\u5f31\u3001\u4e0d\u80fd\u591a\u70b9\u8fde\u63a5\u201d \u7684\u75db\u70b9\u8bbe\u8ba1\u7684&#xff0c;\u4e3b\u6253\u5de5\u4e1a\u73af\u5883\u4e0b\u7684\u957f\u8ddd\u79bb\u3001\u591a\u8bbe\u5907\u901a\u4fe1&#xff0c;\u662f Modbus RTU\u3001Profibus \u7b49\u5de5\u4e1a\u534f\u8bae\u7684\u6838\u5fc3\u7269\u7406\u5c42\u6807\u51c6\u3002<\/p>\n<h5>\u6838\u5fc3\u539f\u7406&#xff1a;\u5dee\u5206\u4fe1\u53f7\u4f20\u8f93<\/h5>\n<p>\u201c\u5dee\u5206\u901a\u4fe1\u201d \u6307\u901a\u8fc7\u4e24\u6839\u53cc\u7ede\u7ebf&#xff08;A \u7ebf\u548c B \u7ebf&#xff09;\u4f20\u8f93\u76f8\u53cd\u7684\u4fe1\u53f7&#xff0c;\u4fe1\u53f7\u7684\u903b\u8f91\u7531 A\u3001B \u7ebf\u4e4b\u95f4\u7684\u7535\u538b\u5dee\u51b3\u5b9a&#xff0c;\u800c\u975e\u4ee5\u5730\u4e3a\u53c2\u8003\u3002<\/p>\n<ul>\n<li>\n<p>\u4fe1\u53f7\u7535\u5e73\u5b9a\u4e49&#xff08;EIA\/TIA-485-A \u6807\u51c6&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u903b\u8f91 1&#xff1a;B \u7ebf\u7535\u538b &#8211; A \u7ebf\u7535\u538b \u2265 &#043;0.2V&#xff08;\u901a\u5e38 A \u7ebf\u4e3a\u4f4e\u3001B \u7ebf\u4e3a\u9ad8&#xff09;<\/li>\n<li>\u903b\u8f91 0&#xff1a;A \u7ebf\u7535\u538b &#8211; B \u7ebf\u7535\u538b \u2265 &#043;0.2V&#xff08;\u901a\u5e38 A \u7ebf\u4e3a\u9ad8\u3001B \u7ebf\u4e3a\u4f4e&#xff09;<\/li>\n<li>\u603b\u7ebf\u7a7a\u95f2&#xff1a;A\u3001B \u7ebf\u7535\u538b\u5dee\u63a5\u8fd1 0V&#xff08;\u9700\u5916\u63a5 120\u03a9 \u7ec8\u7aef\u7535\u963b\u5339\u914d\u963b\u6297&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5178\u578b\u63a5\u53e3\u7ed3\u6784&#xff1a;<\/p>\n<ul>\n<li>\u603b\u7ebf\u62d3\u6251&#xff1a;\u6240\u6709\u8bbe\u5907\u7684 A \u7ebf\u5e76\u8054\u3001B \u7ebf\u5e76\u8054&#xff08;\u65e0\u661f\u578b \/ \u73af\u5f62\u62d3\u6251&#xff0c;\u907f\u514d\u4fe1\u53f7\u53cd\u5c04&#xff09;&#xff1b;<\/li>\n<li>\u9a71\u52a8\u82af\u7247&#xff1a;\u9700\u4e13\u7528 RS-485 \u82af\u7247&#xff08;\u5982 MAX485\u3001SN75176&#xff09;&#xff0c;\u5b9e\u73b0 \u201c\u53d1\u9001 \/ \u63a5\u6536\u201d \u6a21\u5f0f\u5207\u6362&#xff08;\u901a\u8fc7 DE\/RE \u5f15\u811a\u63a7\u5236&#xff09;&#xff1b;<\/li>\n<li>\u7ec8\u7aef\u7535\u963b&#xff1a;\u5728\u603b\u7ebf\u7684\u4e24\u7aef\u8bbe\u5907\u4e0a\u5404\u63a5\u4e00\u4e2a 120\u03a9 \u7535\u963b&#xff08;\u5339\u914d\u53cc\u7ede\u7ebf\u7279\u6027\u963b\u6297&#xff0c;\u51cf\u5c11\u4fe1\u53f7\u53cd\u5c04&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u901a\u4fe1\u6d41\u7a0b&#xff08;\u534a\u53cc\u5de5&#xff09;&#xff1a;<\/p>\n<li>\u4e3b\u8bbe\u5907\u63a7\u5236 RS-485 \u82af\u7247\u8fdb\u5165 \u201c\u53d1\u9001\u6a21\u5f0f\u201d&#xff08;DE&#061;1\u3001RE&#061;0&#xff09;&#xff0c;\u901a\u8fc7 A\/B \u7ebf\u53d1\u9001\u5dee\u5206\u4fe1\u53f7&#xff1b;<\/li>\n<li>\u6240\u6709\u4ece\u8bbe\u5907\u5904\u4e8e \u201c\u63a5\u6536\u6a21\u5f0f\u201d&#xff08;DE&#061;0\u3001RE&#061;1&#xff09;&#xff0c;\u89e3\u6790 A\/B \u7ebf\u7684\u7535\u538b\u5dee\u83b7\u53d6\u6570\u636e&#xff1b;<\/li>\n<li>\u4ece\u8bbe\u5907\u54cd\u5e94\u65f6&#xff0c;\u5207\u6362\u4e3a \u201c\u53d1\u9001\u6a21\u5f0f\u201d&#xff0c;\u4e3b\u8bbe\u5907\u5207\u6362\u4e3a \u201c\u63a5\u6536\u6a21\u5f0f\u201d&#xff1b;<\/li>\n<li>\u540c\u4e00\u65f6\u95f4\u603b\u7ebf\u53ea\u80fd\u6709\u4e00\u4e2a\u8bbe\u5907\u53d1\u9001\u6570\u636e&#xff08;\u907f\u514d\u51b2\u7a81&#xff0c;\u9700\u4e0a\u5c42\u534f\u8bae\u63a7\u5236&#xff0c;\u5982 Modbus \u7684\u4e3b\u4ece\u673a\u5236&#xff09;\u3002<\/li>\n<\/li>\n<\/ul>\n<h4>3. RS-422&#xff1a;\u70b9\u5bf9\u70b9\u5168\u53cc\u5de5\u7684\u5dee\u5206\u901a\u4fe1\u6807\u51c6<\/h4>\n<p>RS-422&#xff08;\u4e0e RS-485 \u540c\u671f\u53d1\u5e03&#xff09;\u540c\u6837\u57fa\u4e8e\u5dee\u5206\u4fe1\u53f7\u4f20\u8f93&#xff0c;\u4f46\u5176\u8bbe\u8ba1\u76ee\u6807\u662f\u89e3\u51b3 RS-232 \u7684 \u201c\u5168\u53cc\u5de5\u201d \u9700\u6c42\u2014\u2014 \u5373\u8bbe\u5907\u53ef\u540c\u65f6\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e&#xff0c;\u65e0\u9700\u5207\u6362\u6a21\u5f0f&#xff0c;\u9002\u7528\u4e8e\u9700\u8981\u9ad8\u901f\u53cc\u5411\u901a\u4fe1\u7684\u573a\u666f&#xff08;\u5982\u5de5\u4e1a\u76f8\u673a\u3001\u8fd0\u52a8\u63a7\u5236\u5668&#xff09;\u3002<\/p>\n<h5>\u6838\u5fc3\u539f\u7406&#xff1a;\u5dee\u5206\u4fe1\u53f7 &#043; \u72ec\u7acb\u6536\u53d1\u901a\u9053<\/h5>\n<p>RS-422 \u7684\u6838\u5fc3\u662f\u901a\u8fc7 4 \u6839\u53cc\u7ede\u7ebf&#xff08;A&#043;\u3001A-\u3001B&#043;\u3001B-&#xff09;\u6784\u5efa\u4e24\u4e2a\u72ec\u7acb\u7684\u5dee\u5206\u901a\u9053&#xff1a;\u4e00\u4e2a\u7528\u4e8e\u53d1\u9001&#xff08;A&#043;\u3001A-&#xff09;&#xff0c;\u4e00\u4e2a\u7528\u4e8e\u63a5\u6536&#xff08;B&#043;\u3001B-&#xff09;&#xff0c;\u5b9e\u73b0\u5168\u53cc\u5de5\u901a\u4fe1\u3002<\/p>\n<ul>\n<li>\n<p>\u4fe1\u53f7\u7535\u5e73\u5b9a\u4e49&#xff1a;\u4e0e RS-485 \u5b8c\u5168\u4e00\u81f4&#xff08;\u903b\u8f91 1\/0 \u7531\u5dee\u5206\u7535\u538b\u5dee\u51b3\u5b9a&#xff09;&#xff1b;<\/p>\n<\/li>\n<li>\n<p>\u5178\u578b\u63a5\u53e3\u7ed3\u6784 &#xff1a;<\/p>\n<ul>\n<li>\u70b9\u5bf9\u70b9\u62d3\u6251&#xff1a;\u4ec5\u652f\u6301\u4e24\u4e2a\u8bbe\u5907\u901a\u4fe1&#xff08;\u4e3b\u673a\u548c\u4ece\u673a&#xff09;&#xff0c;\u65e0\u591a\u70b9\u8fde\u63a5\u80fd\u529b&#xff1b;<\/li>\n<li>\u901a\u9053\u5206\u79bb&#xff1a;\u53d1\u9001\u901a\u9053&#xff08;\u4e3b\u673a TX&#043; \u2192 \u4ece\u673a RX&#043;&#xff0c;\u4e3b\u673a TX- \u2192 \u4ece\u673a RX-&#xff09;\u3001\u63a5\u6536\u901a\u9053&#xff08;\u4ece\u673a TX&#043; \u2192 \u4e3b\u673a RX&#043;&#xff0c;\u4ece\u673a TX- \u2192 \u4e3b\u673a RX-&#xff09;&#xff1b;<\/li>\n<li>\u7ec8\u7aef\u7535\u963b&#xff1a;\u540c\u6837\u9700\u5728\u4e24\u4e2a\u8bbe\u5907\u7684\u6536\u53d1\u901a\u9053\u4e24\u7aef\u5404\u63a5 120\u03a9 \u7535\u963b&#xff08;\u5339\u914d\u963b\u6297&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u901a\u4fe1\u6d41\u7a0b&#xff08;\u5168\u53cc\u5de5&#xff09;&#xff1a;<\/p>\n<li>\u4e3b\u673a\u7684\u53d1\u9001\u901a\u9053&#xff08;A&#043;\u3001A-&#xff09;\u548c\u4ece\u673a\u7684\u63a5\u6536\u901a\u9053&#xff08;B&#043;\u3001B-&#xff09;\u5e38\u901a&#xff0c;\u4e3b\u673a\u53ef\u968f\u65f6\u53d1\u9001\u6570\u636e&#xff1b;<\/li>\n<li>\u4ece\u673a\u7684\u53d1\u9001\u901a\u9053&#xff08;A&#043;\u3001A-&#xff09;\u548c\u4e3b\u673a\u7684\u63a5\u6536\u901a\u9053&#xff08;B&#043;\u3001B-&#xff09;\u5e38\u901a&#xff0c;\u4ece\u673a\u53ef\u968f\u65f6\u54cd\u5e94&#xff1b;<\/li>\n<li>\u6536\u53d1\u901a\u9053\u72ec\u7acb&#xff0c;\u65e0\u9700\u6a21\u5f0f\u5207\u6362&#xff0c;\u652f\u6301 \u201c\u540c\u65f6\u53d1\u3001\u540c\u65f6\u6536\u201d&#xff08;\u5982\u4e3b\u673a\u53d1\u9001\u63a7\u5236\u6307\u4ee4\u7684\u540c\u65f6&#xff0c;\u4ece\u673a\u8fd4\u56de\u5b9e\u65f6\u6570\u636e&#xff09;\u3002<\/li>\n<\/li>\n<\/ul>\n<h3>\u4e09\u3001\u4e09\u79cd\u6807\u51c6\u7684\u6838\u5fc3\u5dee\u5f02\u5bf9\u6bd4<\/h3>\n<p>RS-232\u3001RS-485\u3001RS-422 \u7684\u5dee\u5f02\u8d2f\u7a7f \u201c\u7535\u6c14\u7279\u6027\u3001\u62d3\u6251\u7ed3\u6784\u3001\u529f\u80fd\u80fd\u529b\u201d \u7b49\u7ef4\u5ea6&#xff0c;\u76f4\u63a5\u51b3\u5b9a\u4e86\u5b83\u4eec\u7684\u9002\u7528\u573a\u666f\u3002\u4e0b\u8868\u4ece 10 \u4e2a\u5173\u952e\u7ef4\u5ea6\u8fdb\u884c\u5bf9\u6bd4&#xff1a;<\/p>\n<table>\n<tr>\u5bf9\u6bd4\u7ef4\u5ea6RS-232RS-485RS-422<\/tr>\n<tbody>\n<tr>\n<td>\u4fe1\u53f7\u4f20\u8f93\u65b9\u5f0f<\/td>\n<td>\u5355\u7aef&#xff08;\u4ee5 GND \u4e3a\u53c2\u8003&#xff09;<\/td>\n<td>\u5dee\u5206&#xff08;A\/B \u7ebf\u7535\u538b\u5dee&#xff09;<\/td>\n<td>\u5dee\u5206&#xff08;\u72ec\u7acb\u6536\u53d1\u901a\u9053&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u62d3\u6251\u7ed3\u6784<\/td>\n<td>\u70b9\u5bf9\u70b9&#xff08;\u4ec5 2 \u4e2a\u8bbe\u5907&#xff09;<\/td>\n<td>\u603b\u7ebf\u578b&#xff08;\u591a\u70b9\u5e76\u8054&#xff09;<\/td>\n<td>\u70b9\u5bf9\u70b9&#xff08;\u4ec5 2 \u4e2a\u8bbe\u5907&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u8bbe\u5907\u6570\u91cf<\/td>\n<td>\u6700\u591a 2 \u4e2a&#xff08;\u4e3b &#043; \u4ece&#xff09;<\/td>\n<td>\u6700\u591a 32 \u4e2a&#xff08;1 \u4e3b &#043; 31 \u4ece&#xff09;<\/td>\n<td>\u6700\u591a 2 \u4e2a&#xff08;\u4e3b &#043; \u4ece&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u901a\u4fe1\u6a21\u5f0f<\/td>\n<td>\u5168\u53cc\u5de5&#xff08;TX\/RX \u72ec\u7acb&#xff09;<\/td>\n<td>\u534a\u53cc\u5de5&#xff08;\u9700\u5207\u6362\u6536\u53d1\u6a21\u5f0f&#xff09;<\/td>\n<td>\u5168\u53cc\u5de5&#xff08;\u6536\u53d1\u901a\u9053\u72ec\u7acb&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u901a\u4fe1\u8ddd\u79bb<\/td>\n<td>\u6700\u5927 15 \u7c73&#xff08;9600bps&#xff09;<\/td>\n<td>\u6700\u5927 1200 \u7c73&#xff08;9600bps&#xff09;<\/td>\n<td>\u6700\u5927 1200 \u7c73&#xff08;9600bps&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u6700\u9ad8\u901f\u7387<\/td>\n<td>20kbps&#xff08;15 \u7c73\u65f6&#xff09;<\/td>\n<td>10Mbps&#xff08;10 \u7c73\u65f6&#xff09;<\/td>\n<td>10Mbps&#xff08;10 \u7c73\u65f6&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u6297\u5e72\u6270\u80fd\u529b<\/td>\n<td>\u5f31&#xff08;\u6613\u53d7\u5171\u6a21\u566a\u58f0\u5f71\u54cd&#xff09;<\/td>\n<td>\u5f3a&#xff08;\u5dee\u5206\u4fe1\u53f7\u6291\u5236\u5171\u6a21\u566a\u58f0&#xff09;<\/td>\n<td>\u5f3a&#xff08;\u540c RS-485&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u63a5\u7ebf\u590d\u6742\u5ea6<\/td>\n<td>\u7b80\u5355&#xff08;3 \u7ebf&#xff1a;TX\/RX\/GND&#xff09;<\/td>\n<td>\u4e2d\u7b49&#xff08;2 \u7ebf&#xff1a;A\/B&#xff0c;\u9700\u7ec8\u7aef\u7535\u963b&#xff09;<\/td>\n<td>\u590d\u6742&#xff08;4 \u7ebf&#xff1a;TX&#043;\/TX-\/RX&#043;\/RX-&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u5178\u578b\u5e94\u7528<\/td>\n<td>\u8bbe\u5907\u8c03\u8bd5\u53e3\u3001\u6253\u5370\u673a\u8fde\u63a5<\/td>\n<td>\u5de5\u4e1a\u603b\u7ebf&#xff08;Modbus RTU&#xff09;\u3001\u4f20\u611f\u5668\u7f51\u7edc<\/td>\n<td>\u9ad8\u901f\u53cc\u5411\u901a\u4fe1&#xff08;\u5de5\u4e1a\u76f8\u673a\u3001\u8fd0\u52a8\u63a7\u5236&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u6210\u672c<\/td>\n<td>\u4f4e&#xff08;\u65e0\u9700\u4e13\u7528\u82af\u7247&#xff09;<\/td>\n<td>\u4e2d&#xff08;\u9700 RS-485 \u82af\u7247 &#043; \u7ec8\u7aef\u7535\u963b&#xff09;<\/td>\n<td>\u9ad8&#xff08;\u9700 RS-422 \u82af\u7247 &#043; \u66f4\u591a\u7ebf\u6750&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u56db\u3001\u5173\u952e\u5dee\u5f02\u6df1\u5ea6\u89e3\u6790<\/h3>\n<h4>1. \u6297\u5e72\u6270\u80fd\u529b&#xff1a;\u4e3a\u4ec0\u4e48 RS-485\/422 \u8fdc\u4f18\u4e8e RS-232&#xff1f;<\/h4>\n<p>\u5de5\u4e1a\u73af\u5883\u4e2d\u5b58\u5728\u5927\u91cf \u201c\u5171\u6a21\u566a\u58f0\u201d&#xff08;\u5982\u7535\u673a\u3001\u53d8\u9891\u5668\u4ea7\u751f\u7684\u7535\u78c1\u5e72\u6270&#xff0c;\u5bfc\u81f4\u8bbe\u5907\u63a5\u5730\u7535\u4f4d\u5dee&#xff09;&#xff0c;\u8fd9\u662f RS-232 \u7684\u4e3b\u8981\u75db\u70b9&#xff1a;<\/p>\n<ul>\n<li>RS-232 \u7684\u5355\u7aef\u4fe1\u53f7\u4ee5 GND \u4e3a\u53c2\u8003&#xff0c;\u82e5\u4e3b\u4ece\u8bbe\u5907\u63a5\u5730\u7535\u4f4d\u5dee\u4e3a 2V&#xff0c;\u4f1a\u76f4\u63a5\u53e0\u52a0\u5230\u4fe1\u53f7\u4e0a&#xff0c;\u5bfc\u81f4\u903b\u8f91\u8bef\u5224&#xff1b;<\/li>\n<li>RS-485\/422 \u7684\u5dee\u5206\u4fe1\u53f7\u4ec5\u5173\u6ce8 A\/B \u7ebf\u7684\u7535\u538b\u5dee&#xff0c;\u5171\u6a21\u566a\u58f0\u4f1a\u540c\u65f6\u4f5c\u7528\u4e8e A\u3001B \u7ebf&#xff0c;\u5dee\u503c\u62b5\u6d88&#xff0c;\u56e0\u6b64\u80fd\u6291\u5236\u9ad8\u8fbe \u00b17V \u7684\u5171\u6a21\u566a\u58f0&#xff08;\u5927\u90e8\u5206\u5de5\u4e1a\u573a\u666f\u7684\u566a\u58f0\u90fd\u5728\u6b64\u8303\u56f4\u5185&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b&#xff1a;\u5f53\u5de5\u4e1a\u73b0\u573a\u5b58\u5728 5V \u5171\u6a21\u566a\u58f0\u65f6&#xff1a;<\/p>\n<ul>\n<li>RS-232&#xff1a;\u4fe1\u53f7\u7535\u5e73\u4ece &#043; 5V&#xff08;\u903b\u8f91 0&#xff09;\u53d8\u4e3a &#043; 10V&#xff08;\u4ecd\u4e3a\u903b\u8f91 0&#xff09;&#xff0c;\u4f46\u82e5\u566a\u58f0\u5bfc\u81f4\u7535\u5e73\u4f4e\u4e8e &#043; 3V&#xff0c;\u4f1a\u8bef\u5224\u4e3a\u903b\u8f91 1&#xff1b;<\/li>\n<li>RS-485&#xff1a;A \u7ebf\u7535\u538b\u4ece 0V \u53d8\u4e3a 5V&#xff0c;B \u7ebf\u7535\u538b\u4ece 5V \u53d8\u4e3a 10V&#xff0c;A\/B \u7ebf\u5dee\u503c\u4ecd\u4e3a 5V&#xff08;\u903b\u8f91 1&#xff09;&#xff0c;\u65e0\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<h4>2. \u901a\u4fe1\u8ddd\u79bb\u4e0e\u901f\u7387&#xff1a;\u4e3a\u4ec0\u4e48 RS-485\/422 \u80fd\u4f20 1200 \u7c73&#xff1f;<\/h4>\n<p>\u4fe1\u53f7\u4f20\u8f93\u8ddd\u79bb\u4e0e\u901f\u7387\u7684\u5173\u7cfb\u7531 \u201c\u4fe1\u53f7\u8870\u51cf\u201d \u548c \u201c\u4f20\u8f93\u7ebf\u7535\u5bb9\u201d \u51b3\u5b9a&#xff1a;<\/p>\n<ul>\n<li>RS-232 \u7684\u5355\u7aef\u4fe1\u53f7\u5728\u957f\u8ddd\u79bb\u4f20\u8f93\u4e2d\u8870\u51cf\u5feb&#xff0c;\u4e14\u53cc\u7ede\u7ebf\u7535\u5bb9\u4f1a\u5bfc\u81f4\u4fe1\u53f7\u8fb9\u6cbf\u53d8\u7f13&#xff0c;9600bps \u901f\u7387\u4e0b\u6700\u5927\u8ddd\u79bb\u4ec5 15 \u7c73&#xff1b;<\/li>\n<li>RS-485\/422 \u7684\u5dee\u5206\u4fe1\u53f7\u8870\u51cf\u6162&#xff0c;\u4e14\u4e13\u7528\u53cc\u7ede\u7ebf\u7684\u7279\u6027\u963b\u6297&#xff08;120\u03a9&#xff09;\u4e0e\u7ec8\u7aef\u7535\u963b\u5339\u914d&#xff0c;\u51cf\u5c11\u4fe1\u53f7\u53cd\u5c04&#xff0c;\u56e0\u6b64 9600bps \u901f\u7387\u4e0b\u53ef\u4f20 1200 \u7c73&#xff0c;10Mbps \u901f\u7387\u4e0b\u4ecd\u53ef\u4f20 10 \u7c73\u3002<\/li>\n<\/ul>\n<h4>3. \u534a\u53cc\u5de5 vs \u5168\u53cc\u5de5&#xff1a;RS-485 \u4e3a\u4ec0\u4e48\u4e0d\u652f\u6301\u5168\u53cc\u5de5&#xff1f;<\/h4>\n<p>RS-485 \u7684\u534a\u53cc\u5de5\u8bbe\u8ba1\u662f\u4e3a\u4e86 \u201c\u7b80\u5316\u63a5\u7ebf\u3001\u652f\u6301\u591a\u70b9\u8fde\u63a5\u201d&#xff1a;<\/p>\n<ul>\n<li>\u82e5 RS-485 \u8981\u5b9e\u73b0\u5168\u53cc\u5de5&#xff0c;\u9700\u989d\u5916\u589e\u52a0 2 \u6839\u7ebf&#xff08;\u53d1\u9001 A\/B &#043; \u63a5\u6536 A\/B&#xff09;&#xff0c;\u53d8\u6210 4 \u7ebf\u5236&#xff0c;\u6b64\u65f6\u62d3\u6251\u4f1a\u590d\u6742&#xff0c;\u4e14\u8bbe\u5907\u6570\u91cf\u4ecd\u53d7\u9650\u4e8e 32 \u4e2a&#xff1b;<\/li>\n<li>\u5de5\u4e1a\u573a\u666f\u4e2d&#xff0c;\u5927\u591a\u6570\u901a\u4fe1\u662f \u201c\u4e3b\u4ece\u8f6e\u8be2\u201d&#xff08;\u4e3b\u8bbe\u5907\u4f9d\u6b21\u8be2\u95ee\u4ece\u8bbe\u5907&#xff0c;\u4ece\u8bbe\u5907\u4ec5\u5728\u88ab\u8be2\u95ee\u65f6\u54cd\u5e94&#xff09;&#xff0c;\u534a\u53cc\u5de5\u5b8c\u5168\u6ee1\u8db3\u9700\u6c42&#xff0c;\u4e14 2 \u7ebf\u5236\u63a5\u7ebf\u6210\u672c\u66f4\u4f4e&#xff1b;<\/li>\n<li>RS-422 \u7684\u5168\u53cc\u5de5\u662f\u4ee5 \u201c\u727a\u7272\u591a\u70b9\u8fde\u63a5\u201d \u4e3a\u4ee3\u4ef7\u7684 \u2014\u20144 \u7ebf\u5236\u4ec5\u652f\u6301\u70b9\u5bf9\u70b9&#xff0c;\u65e0\u6cd5\u6269\u5c55\u8bbe\u5907\u6570\u91cf\u3002<\/li>\n<\/ul>\n<h3>\u4e94\u3001\u9009\u578b\u5efa\u8bae<\/h3>\n<li>\u9009 RS-232 \u7684\u573a\u666f&#xff1a;\n<ul>\n<li>\u77ed\u8ddd\u79bb&#xff08;&lt;15 \u7c73&#xff09;\u3001\u4f4e\u901f\u7387&#xff08;&lt;20kbps&#xff09;&#xff1b;<\/li>\n<li>\u65e0\u5f3a\u5e72\u6270\u73af\u5883&#xff08;\u5982\u5b9e\u9a8c\u5ba4\u3001\u8bbe\u5907\u672c\u5730\u8c03\u8bd5&#xff09;&#xff1b;<\/li>\n<li>\u4ec5\u9700\u70b9\u5bf9\u70b9\u8fde\u63a5&#xff08;\u5982 PLC \u7684 USB \u8f6c 232 \u8c03\u8bd5\u53e3&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u9009 RS-485 \u7684\u573a\u666f&#xff1a;\n<ul>\n<li>\u957f\u8ddd\u79bb&#xff08;&lt;1200 \u7c73&#xff09;\u3001\u4e2d\u9ad8\u901f\u7387&#xff08;&lt;10Mbps&#xff09;&#xff1b;<\/li>\n<li>\u5de5\u4e1a\u5e72\u6270\u73af\u5883&#xff08;\u5982\u8f66\u95f4\u3001\u53d8\u7535\u7ad9&#xff09;&#xff1b;<\/li>\n<li>\u9700\u8fde\u63a5\u591a\u4e2a\u8bbe\u5907&#xff08;\u5982 1 \u4e2a\u63a7\u5236\u5668 &#043; 10 \u4e2a\u4f20\u611f\u5668&#xff09;&#xff1b;<\/li>\n<li>\u91c7\u7528\u4e3b\u4ece\u534f\u8bae&#xff08;\u5982 Modbus RTU&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u9009 RS-422 \u7684\u573a\u666f&#xff1a;\n<ul>\n<li>\u957f\u8ddd\u79bb&#xff08;&lt;1200 \u7c73&#xff09;\u3001\u9ad8\u901f\u7387&#xff08;&lt;10Mbps&#xff09;&#xff1b;<\/li>\n<li>\u9700\u540c\u65f6\u6536\u53d1\u6570\u636e&#xff08;\u5982\u5de5\u4e1a\u76f8\u673a\u5b9e\u65f6\u4f20\u56fe\u50cf &#043; \u63a5\u6536\u63a7\u5236\u6307\u4ee4&#xff09;&#xff1b;<\/li>\n<li>\u4ec5\u9700\u70b9\u5bf9\u70b9\u8fde\u63a5&#xff08;\u5982\u8fd0\u52a8\u63a7\u5236\u5668\u4e0e\u4f3a\u670d\u9a71\u52a8\u5668&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<h3>\u516d\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u89e3\u51b3\u65b9\u6848<\/h3>\n<h4>1. RS-485 \u603b\u7ebf\u901a\u4fe1\u4e0d\u7a33\u5b9a&#xff1f;<\/h4>\n<ul>\n<li>\u672a\u63a5\u7ec8\u7aef\u7535\u963b&#xff1a;\u5bfc\u81f4\u4fe1\u53f7\u53cd\u5c04&#xff0c;\u9700\u5728\u603b\u7ebf\u4e24\u7aef\u8bbe\u5907\u63a5 120\u03a9 \u7535\u963b&#xff1b;<\/li>\n<li>\u603b\u7ebf\u62d3\u6251\u9519\u8bef&#xff1a;\u91c7\u7528\u661f\u578b\u63a5\u7ebf&#xff0c;\u5bfc\u81f4\u4fe1\u53f7\u8870\u51cf&#xff0c;\u9700\u6539\u4e3a\u603b\u7ebf\u578b&#xff08;\u6240\u6709\u8bbe\u5907 A\/B \u7ebf\u5e76\u8054&#xff09;&#xff1b;<\/li>\n<li>\u8bbe\u5907\u5730\u5740\u51b2\u7a81&#xff1a;\u591a\u4e2a\u4ece\u8bbe\u5907\u5730\u5740\u76f8\u540c&#xff0c;\u9700\u786e\u4fdd\u6bcf\u4e2a\u4ece\u8bbe\u5907\u5730\u5740\u552f\u4e00&#xff1b;<\/li>\n<li>\u5171\u6a21\u566a\u58f0\u8fc7\u5927&#xff1a;\u8d85\u8fc7 \u00b17V&#xff0c;\u9700\u589e\u52a0 \u201c\u5171\u6a21\u6291\u5236\u5668\u201d \u6216\u91c7\u7528\u9694\u79bb\u578b RS-485 \u6a21\u5757\u3002<\/li>\n<\/ul>\n<h4>2. RS-232 \u901a\u4fe1\u8ddd\u79bb\u4e0d\u591f&#xff1f;<\/h4>\n<ul>\n<li>\u901f\u7387\u964d\u4f4e&#xff1a;\u5c06 9600bps \u964d\u81f3 2400bps&#xff0c;\u53ef\u5ef6\u957f\u8ddd\u79bb\u81f3 30 \u7c73\u5de6\u53f3&#xff1b;<\/li>\n<li>\u589e\u52a0\u4e2d\u7ee7\u5668&#xff1a;\u901a\u8fc7 RS-232 \u4e2d\u7ee7\u5668\u653e\u5927\u4fe1\u53f7&#xff0c;\u6bcf\u7ea7\u53ef\u5ef6\u957f 15 \u7c73&#xff1b;<\/li>\n<li>\u66ff\u6362\u4e3a RS-485&#xff1a;\u82e5\u8ddd\u79bb\u8d85\u8fc7 50 \u7c73&#xff0c;\u5efa\u8bae\u6539\u7528 RS-485&#xff08;\u901a\u8fc7 232-485 \u8f6c\u6362\u5668\u8fc7\u6e21&#xff09;\u3002<\/li>\n<\/ul>\n<h3>\u603b\u7ed3<\/h3>\n<p>RS-232\u3001RS-485\u3001RS-422 \u5e76\u975e \u201c\u66ff\u4ee3\u5173\u7cfb\u201d&#xff0c;\u800c\u662f\u9488\u5bf9\u4e0d\u540c\u573a\u666f\u7684 \u201c\u4e92\u8865\u8bbe\u8ba1\u201d&#xff1a;<\/p>\n<ul>\n<li>RS-232 \u662f \u201c\u7b80\u5355\u6613\u7528\u7684\u77ed\u8ddd\u79bb\u65b9\u6848\u201d&#xff0c;\u9002\u5408\u672c\u5730\u8bbe\u5907\u8fde\u63a5&#xff1b;<\/li>\n<li>RS-485 \u662f \u201c\u5de5\u4e1a\u7ea7\u591a\u70b9\u603b\u7ebf\u65b9\u6848\u201d&#xff0c;\u5e73\u8861\u4e86\u6210\u672c\u3001\u8ddd\u79bb\u548c\u8bbe\u5907\u6570\u91cf&#xff1b;<\/li>\n<li>RS-422 \u662f \u201c\u9ad8\u901f\u5168\u53cc\u5de5\u65b9\u6848\u201d&#xff0c;\u9002\u5408\u9700\u5b9e\u65f6\u53cc\u5411\u901a\u4fe1\u7684\u70b9\u5bf9\u70b9\u573a\u666f\u3002<\/li>\n<\/ul>\n<p>\u7406\u89e3\u4e09\u8005\u7684\u6838\u5fc3\u5dee\u5f02&#xff08;\u5dee\u5206 vs \u5355\u7aef\u3001\u534a\u53cc\u5de5 vs \u5168\u53cc\u5de5\u3001\u591a\u70b9 vs \u70b9\u5bf9\u70b9&#xff09;&#xff0c;\u662f\u5de5\u4e1a\u901a\u4fe1\u7cfb\u7edf\u9009\u578b\u548c\u6545\u969c\u6392\u67e5\u7684\u5173\u952e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3010Modbus\u3011RS-232\u3001RS-485 \u4e0e RS-422&#xff1a;\u901a\u4fe1\u6807\u51c6\u539f\u7406\u4e0e\u5dee\u5f02\u8be6\u89e3 \u6587\u7ae0\u76ee\u5f55\u3010Modbus\u3011RS-232\u3001RS-485 \u4e0e RS-422&#xff1a;\u901a\u4fe1\u6807\u51c6\u539f\u7406\u4e0e\u5dee\u5f02\u8be6\u89e3\u4e00\u3001\u57fa\u7840\u6982\u5ff5&#xff1a;\u4ec0\u4e48\u662f RS \u7cfb\u5217\u6807\u51c6&#xff1f;\u4e8c\u3001\u5404\u6807\u51c6\u7684\u5b9e\u73b0\u539f\u74061. RS-232&#xff1a;\u70b9\u5bf9\u70b9\u7684\u5355\u7aef\u901a\u4fe1\u6807\u51c6\u6838\u5fc3\u539f\u7406&#xff1a;\u5355\u7aef\u4fe1\u53f7\u4f20\u8f932. 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