{"id":44506,"date":"2026-06-28T14:16:45","date_gmt":"2026-06-28T06:16:45","guid":{"rendered":"https:\/\/www.modbus.cn\/44506.html"},"modified":"2026-06-28T14:46:12","modified_gmt":"2026-06-28T06:46:12","slug":"modbus-rtu-vs-tcp-comparison","status":"publish","type":"post","link":"https:\/\/www.modbus.cn\/en\/44506.html","title":{"rendered":"Modbus RTU \u4e0e Modbus TCP \u6df1\u5ea6\u5bf9\u6bd4\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u5168\u9762\u89e3\u6790"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Modbus RTU \u4e0e Modbus TCP \u6df1\u5ea6\u5bf9\u6bd4\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u5168\u9762\u89e3\u6790<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5173\u952e\u8bcd\uff1a<\/strong>Modbus RTU vs TCP\u3001Modbus TCP \u62a5\u6587\u683c\u5f0f\u3001Modbus RTU \u4e32\u884c\u901a\u4fe1\u3001MBAP \u62a5\u5934\u3001Modbus \u4f20\u8f93\u6a21\u5f0f\u5bf9\u6bd4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus \u534f\u8bae\u4ece 1979 \u5e74\u8bde\u751f\u81f3\u4eca\uff0c\u5386\u7ecf\u56db\u5341\u4f59\u5e74\u7684\u6f14\u8fdb\uff0c\u53d1\u5c55\u51fa\u4e86\u4e24\u79cd\u4e3b\u6d41\u7684\u4f20\u8f93\u6a21\u5f0f\uff1a\u57fa\u4e8e\u4e32\u884c\u94fe\u8def\u7684 Modbus RTU\uff08\u4ee5\u53ca ASCII\uff09\u548c\u57fa\u4e8e\u4ee5\u592a\u7f51\u7684 Modbus TCP\u3002\u867d\u7136\u4e24\u79cd\u6a21\u5f0f\u5728\u5e94\u7528\u5c42\u5171\u4eab\u76f8\u540c\u7684\u529f\u80fd\u7801\u548c\u6570\u636e\u6a21\u578b\uff0c\u4f46\u5728\u7269\u7406\u5c42\u3001\u5e27\u683c\u5f0f\u3001\u5bfb\u5740\u65b9\u5f0f\u3001\u6027\u80fd\u7279\u6027\u4e0a\u5b58\u5728\u663e\u8457\u5dee\u5f02\u3002\u9009\u62e9\u9519\u8bef\u7684\u6a21\u5f0f\uff0c\u53ef\u80fd\u5bfc\u81f4\u9879\u76ee\u5de5\u671f\u5ef6\u8bef\u751a\u81f3\u7cfb\u7edf\u4e0d\u53ef\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\u5c06\u4ece\u7269\u7406\u5c42\u3001\u6570\u636e\u94fe\u8def\u5c42\u3001\u7f51\u7edc\u5c42\u3001\u5e94\u7528\u5c42\u56db\u4e2a\u7ef4\u5ea6\uff0c\u6df1\u5ea6\u5bf9\u6bd4 Modbus RTU \u548c Modbus TCP \u7684\u6240\u6709\u5173\u952e\u5dee\u5f02\uff0c\u5e76\u7ed9\u51fa\u5b9e\u9645\u5de5\u7a0b\u4e2d\u7684\u9009\u578b\u5efa\u8bae\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u5386\u53f2\u6f14\u8fdb\uff1a\u4ece\u4e32\u884c\u5230\u4ee5\u592a\u7f51<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a03-frame-comparison.svg\" style=\"max-width:100%;height:auto\" \/ loading=\"lazy\" title=\"Modbus RTU \u4e0e Modbus TCP \u6df1\u5ea6\u5bf9\u6bd4\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u5168\u9762\u89e3\u6790\u63d2\u56fe\" alt=\"Modbus RTU \u4e0e Modbus TCP \u6df1\u5ea6\u5bf9\u6bd4\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u5168\u9762\u89e3\u6790\u63d2\u56fe\" \/><figcaption class=\"wp-element-caption\">\u25b2 \u56fe1\uff1aRTU \u5e27\uff08\u5730\u5740+\u529f\u80fd\u7801+\u6570\u636e+CRC\uff09\u4e0e TCP \u5e27\uff08MBAP\u5934+PDU\uff09\u9010\u5b57\u6bb5\u5bf9\u6bd4\u3002<\/figcaption><\/figure>\n<\/div>\n\n\n\n\n\n\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u662f Modbus \u534f\u8bae\u6700\u539f\u59cb\u7684\u5f62\u6001\uff0c\u8bbe\u8ba1\u4e8e 1979 \u5e74\uff0c\u8fd0\u884c\u5728 RS-232 \u6216 RS-485 \u4e32\u884c\u603b\u7ebf\u4e0a\u3002\u5728\u5f53\u65f6\u7684\u5de5\u4e1a\u73af\u5883\u4e2d\uff0c\u4e32\u884c\u901a\u4fe1\u662f\u6700\u7ecf\u6d4e\u53ef\u9760\u7684\u65b9\u6848\u3002RTU \u6a21\u5f0f\u91c7\u7528\u7d27\u51d1\u7684\u4e8c\u8fdb\u5236\u7f16\u7801\uff0c\u4f20\u8f93\u6548\u7387\u9ad8\uff0c\u81f3\u4eca\u4ecd\u662f\u5de5\u4e1a\u73b0\u573a\u6700\u5e7f\u6cdb\u4f7f\u7528\u7684 Modbus \u53d8\u4f53\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus TCP \u8bde\u751f\u4e8e 1999 \u5e74\uff0c\u662f\u4e3a\u9002\u5e94\u4ee5\u592a\u7f51\/IP \u7f51\u7edc\u7684\u5feb\u901f\u53d1\u5c55\u800c\u8bbe\u8ba1\u7684\u3002\u5b83\u5c06 Modbus \u7684\u5e94\u7528\u5c42\u6570\u636e\u5c01\u88c5\u5728 TCP \u62a5\u6587\u4e2d\uff0c\u4f7f\u5176\u80fd\u591f\u901a\u8fc7\u6807\u51c6\u4ee5\u592a\u7f51\u57fa\u7840\u8bbe\u65bd\u8fdb\u884c\u4f20\u8f93\u3002Modbus TCP \u4fdd\u7559\u4e86 Modbus RTU \u7684\u529f\u80fd\u7801\u548c\u6570\u636e\u6a21\u578b\uff0c\u4f46\u53bb\u9664\u4e86 CRC \u6821\u9a8c\uff08\u7531 TCP \u5c42\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\uff09\uff0c\u589e\u52a0\u4e86 MBAP \u62a5\u5934\u6765\u5904\u7406 IP \u7f51\u7edc\u573a\u666f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u7269\u7406\u5c42\u5bf9\u6bd4<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/www.modbus.cn\/wp-content\/uploads\/diagrams\/a07-osi-comparison.svg\" style=\"max-width:100%;height:auto\" \/ loading=\"lazy\" title=\"Modbus RTU \u4e0e Modbus TCP \u6df1\u5ea6\u5bf9\u6bd4\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u5168\u9762\u89e3\u6790\u63d2\u56fe1\" alt=\"Modbus RTU \u4e0e Modbus TCP \u6df1\u5ea6\u5bf9\u6bd4\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u5168\u9762\u89e3\u6790\u63d2\u56fe1\" \/><figcaption class=\"wp-element-caption\">\u25b2 \u56fe2\uff1aModbus RTU\/TCP \u4e0e\u5176\u4ed6\u4e3b\u6d41\u5de5\u4e1a\u534f\u8bae\u7684 OSI \u5c42\u7ea7\u90e8\u7f72\u5bf9\u6bd4\u3002<\/figcaption><\/figure>\n<\/div>\n\n\n\n\n\n\n\n\n<figure class=\"wp-block-table\"><table>\n    <thead>\n        <tr><th>\u5bf9\u6bd4\u7ef4\u5ea6<\/th><th>Modbus RTU<\/th><th>Modbus TCP<\/th><\/tr>\n    <\/thead>\n    <tbody>\n        <tr><td>\u7269\u7406\u4ecb\u8d28<\/td><td>RS-485\uff08\u4e3b\u6d41\uff09\/ RS-232\uff08\u70b9\u5bf9\u70b9\uff09<\/td><td>\u4ee5\u592a\u7f51\uff08\u53cc\u7ede\u7ebf\/\u5149\u7ea4\uff09<\/td><\/tr>\n        <tr><td>\u62d3\u6251\u7ed3\u6784<\/td><td>\u603b\u7ebf\u578b\uff08\u83ca\u82b1\u94fe\uff09<\/td><td>\u661f\u578b\uff08\u4ea4\u6362\u673a\uff09<\/td><\/tr>\n        <tr><td>\u6700\u5927\u8bbe\u5907\u6570<\/td><td>32 \u8282\u70b9\uff08\u6807\u51c6\uff09\/ 256\uff08\u589e\u5f3a\u6536\u53d1\u5668\uff09<\/td><td>\u7406\u8bba\u4e0a\u65e0\u9650\u5236<\/td><\/tr>\n        <tr><td>\u901a\u4fe1\u8ddd\u79bb<\/td><td>1200m\uff08RS-485 @ 9600bps\uff09<\/td><td>100m\uff08\u94dc\u7f06\uff09\/ \u6570\u516c\u91cc\uff08\u5149\u7ea4\uff09<\/td><\/tr>\n        <tr><td>\u901a\u4fe1\u901f\u7387<\/td><td>1200 ~ 115200 bps<\/td><td>10\/100\/1000 Mbps<\/td><\/tr>\n        <tr><td>\u6297\u5e72\u6270\u80fd\u529b<\/td><td>\u5dee\u5206\u4fe1\u53f7\uff0c\u8f83\u597d<\/td><td>\u6781\u597d\uff08\u5149\u7ea4\u4e0b\u51e0\u4e4e\u96f6\u5e72\u6270\uff09<\/td><\/tr>\n        <tr><td>\u5e03\u7ebf\u6210\u672c<\/td><td>\u4f4e\uff08\u53cc\u7ede\u7ebf\uff09<\/td><td>\u9ad8\uff08\u4ea4\u6362\u673a\u3001\u7f51\u7ebf\/\u5149\u7ea4\uff09<\/td><\/tr>\n        <tr><td>\u5b89\u88c5\u590d\u6742\u5ea6<\/td><td>\u7b80\u5355<\/td><td>\u8f83\u590d\u6742\uff08\u9700 IP \u914d\u7f6e\uff09<\/td><\/tr>\n    <\/tbody>\n<\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 RS-485 \u603b\u7ebf\u7684\u7269\u7406\u7279\u6027<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u662f Modbus RTU \u6700\u5e38\u7528\u7684\u7269\u7406\u5c42\u6807\u51c6\u3002\u5b83\u91c7\u7528\u5dee\u5206\u4fe1\u53f7\u4f20\u8f93\uff08A\/B \u7ebf\uff09\uff0c\u6297\u5171\u6a21\u5e72\u6270\u80fd\u529b\u5f3a\u3002\u4ee5\u4e0b\u662f RS-485 \u7684\u5173\u952e\u7269\u7406\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n    <li><strong>\u5dee\u5206\u7535\u538b\uff1a<\/strong>\u903b\u8f91 1 \u4e3a A \u7ebf\u7535\u538b &gt; B \u7ebf\u7535\u538b\uff08\u901a\u5e38 \u2265 +200mV\uff09\uff0c\u903b\u8f91 0 \u53cd\u4e4b<\/li>\n    <li><strong>\u5171\u6a21\u7535\u538b\u8303\u56f4\uff1a<\/strong>-7V ~ +12V<\/li>\n    <li><strong>\u7ec8\u7aef\u7535\u963b\uff1a<\/strong>120\u03a9\uff08\u5339\u914d\u7279\u6027\u963b\u6297\uff0c\u9632\u6b62\u4fe1\u53f7\u53cd\u5c04\uff09<\/li>\n    <li><strong>\u504f\u7f6e\u7535\u963b\uff1a<\/strong>\u5728\u603b\u7ebf\u7a7a\u95f2\u65f6\u7ef4\u6301\u786e\u5b9a\u7684\u903b\u8f91\u72b6\u6001\uff0c\u907f\u514d\u63a5\u6536\u5668\u8bef\u5224<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e38\u89c1\u5e03\u7ebf\u9519\u8bef\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n    <li>\u5c06 A\/B \u7ebf\u63a5\u53cd\u2014\u2014\u5bfc\u81f4\u4ece\u7ad9\u6536\u4e0d\u5230\u4fe1\u53f7<\/li>\n    <li>\u4f7f\u7528\u661f\u578b\u62d3\u6251\u800c\u975e\u83ca\u82b1\u94fe\u2014\u2014\u4fe1\u53f7\u53cd\u5c04\u4e25\u91cd<\/li>\n    <li>\u5fd8\u8bb0\u5728\u603b\u7ebf\u4e24\u7aef\u6dfb\u52a0\u7ec8\u7aef\u7535\u963b\u2014\u2014\u957f\u8ddd\u79bb\u901a\u4fe1\u4e0d\u7a33\u5b9a<\/li>\n    <li>\u7ec8\u7aef\u7535\u963b\u503c\u4e0d\u5339\u914d\u2014\u2014120\u03a9 \u662f\u6807\u51c6\u503c<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5e27\u683c\u5f0f\u5bf9\u6bd4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 Modbus RTU \u5e27\u7ed3\u6784<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u62a5\u6587\u4ee5\u300c\u7a7a\u95f2\u65f6\u95f4 \u2265 3.5 \u5b57\u7b26\u300d\u4f5c\u4e3a\u5e27\u95f4\u9694\u6807\u5fd7\u3002\u5e27\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 \u22653.5\u5b57\u7b26  \u2502 \u5730\u5740 1B  \u2502 \u529f\u80fd\u7801 1B \u2502 \u6570\u636e N\u5b57\u8282 \u2502 CRC 2B   \u2502 \u22653.5\u5b57\u7b26  \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\n\u793a\u4f8b\uff08\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff09:\n3.5T  01  03  00 6B 00 03  76 87  3.5T\n      \u2191   \u2191   \u2514\u2500\u2500 \u6570\u636e \u2500\u2500\u2518  \u2514 CRC \u2518\n     \u5730\u5740 \u529f\u80fd               \u6821\u9a8c<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>RTU \u5e27\u7684\u5173\u952e\u7279\u5f81\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n    <li>\u6ca1\u6709\u5e27\u5934\u548c\u5e27\u5c3e\u6807\u5fd7\uff0c\u5b8c\u5168\u4f9d\u8d56 3.5 \u5b57\u7b26\u7a7a\u95f2\u65f6\u95f4\u533a\u5206\u5e27\u8fb9\u754c<\/li>\n    <li>CRC-16 \u6821\u9a8c\u8986\u76d6\u6574\u4e2a\u62a5\u6587<\/li>\n    <li>\u540c\u4e00\u65f6\u523b\u603b\u7ebf\u4e0a\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u7ad9<\/li>\n    <li>\u6700\u5927\u5e27\u957f\u5ea6 256 \u5b57\u8282\uff08\u5730\u5740 + \u529f\u80fd\u7801 + \u6570\u636e + CRC\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 Modbus TCP \u5e27\u7ed3\u6784\uff08\u542b MBAP \u62a5\u5934\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus TCP \u5728\u6807\u51c6\u7684 Modbus PDU\uff08\u534f\u8bae\u6570\u636e\u5355\u5143\uff09\u524d\u9762\u589e\u52a0\u4e86 7 \u5b57\u8282\u7684 MBAP \u62a5\u5934\uff08Modbus Application Protocol Header\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502 \u4e8b\u52a1\u6807\u8bc6\u7b26 \u2502 \u534f\u8bae\u6807\u8bc6\u7b26 \u2502 \u957f\u5ea6 2B   \u2502 \u5355\u5143\u6807\u8bc6\u7b26 \u2502 \u529f\u80fd\u7801 1B \u2502 \u6570\u636e N\u5b57\u8282 \u2502\n\u2502   2B      \u2502   2B      \u2502          \u2502  1B      \u2502          \u2502          \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n                 \u2190\u2500\u2500\u2500\u2500\u2500\u2500 MBAP \u62a5\u5934 (7 bytes) \u2500\u2500\u2500\u2500\u2500\u2500\u2192  \u2190\u2500 PDU \u2500\u2192\n\n\u5b57\u6bb5\u8bf4\u660e:\n- \u4e8b\u52a1\u6807\u8bc6\u7b26 (Transaction ID): \u4e3b\u7ad9\u751f\u6210\uff0c\u7528\u4e8e\u5339\u914d\u8bf7\u6c42\u548c\u54cd\u5e94\n- \u534f\u8bae\u6807\u8bc6\u7b26 (Protocol ID): \u56fa\u5b9a\u4e3a 0x0000\uff0c\u8868\u793a Modbus \u534f\u8bae\n- \u957f\u5ea6 (Length): \u540e\u7eed\u5b57\u8282\u6570\uff08\u5355\u5143\u6807\u8bc6\u7b26 + \u529f\u80fd\u7801 + \u6570\u636e\uff09\n- \u5355\u5143\u6807\u8bc6\u7b26 (Unit ID): \u7528\u4e8e\u7f51\u5173\u573a\u666f\uff0c\u6807\u8bc6\u4e0b\u6e38\u4ece\u7ad9\u5730\u5740<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5b8c\u6574 TCP \u5e27\u793a\u4f8b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u8bfb\u53d6\u4ece\u7ad9 1 \u7684\u4fdd\u6301\u5bc4\u5b58\u5668 108-110\uff08\u4e0e RTU \u793a\u4f8b\u76f8\u540c\u64cd\u4f5c\uff09:\n\nTCP \u62a5\u6587:\n00 01  00 00  00 06  01  03  00 6B  00 03\n\u2514\u2500\u252c\u2500\u2500\u2518 \u2514\u2500\u252c\u2500\u2500\u2518 \u2514\u2500\u252c\u2500\u2500\u2518 \u2514\u252c\u2518 \u2514\u2500\u252c\u2500\u2500\u2518 \u2514\u2500\u2500\u252c\u2500\u2500\u2518\n\u4e8b\u52a1ID \u534f\u8baeID \u957f\u5ea6=6 \u5355\u51431 \u529f\u80fd\u7801 \u8d77\u5740=107 \u6570\u91cf=3<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3.3 MBAP \u62a5\u5934\u5404\u5b57\u6bb5\u6df1\u5ea6\u89e3\u6790<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e8b\u52a1\u6807\u8bc6\u7b26\uff08Transaction Identifier\uff09\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f TCP \u6a21\u5f0f\u4e0b\u6700\u6709\u7279\u8272\u7684\u5b57\u6bb5\u3002\u7531\u4e8e TCP \u652f\u6301\u5168\u53cc\u5de5\u901a\u4fe1\uff0c\u4e3b\u7ad9\u53ef\u4ee5\u540c\u65f6\u53d1\u9001\u591a\u4e2a\u8bf7\u6c42\uff08\u5728\u4e0d\u540c TCP \u8fde\u63a5\u6216\u540c\u4e00\u8fde\u63a5\u7684\u4e0d\u540c\u4e8b\u52a1\u4e2d\uff09\uff0c\u4e8b\u52a1\u6807\u8bc6\u7b26\u7528\u4e8e\u5c06\u54cd\u5e94\u4e0e\u5bf9\u5e94\u7684\u8bf7\u6c42\u5339\u914d\u8d77\u6765\u3002\u5728\u53ea\u6709\u4e00\u4e2a\u8bf7\u6c42\/\u54cd\u5e94\u7684\u7b80\u5355\u573a\u666f\u4e2d\uff0c\u901a\u5e38\u8bbe\u4e3a 0x0001 \u5e76\u9012\u589e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u534f\u8bae\u6807\u8bc6\u7b26\uff08Protocol Identifier\uff09\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56fa\u5b9a\u4e3a 0x0000\uff0c\u8868\u793a\u8fd9\u662f Modbus \u534f\u8bae\u3002\u8fd9\u4e2a\u5b57\u6bb5\u7684\u5b58\u5728\u662f\u4e3a\u4e86\u672a\u6765\u53ef\u80fd\u7684\u6269\u5c55\u2014\u2014\u7406\u8bba\u4e0a\u540c\u4e00\u4e2a TCP \u7aef\u53e3\u4e0a\u53ef\u4ee5\u8fd0\u884c\u591a\u79cd\u534f\u8bae\uff0c\u534f\u8bae\u6807\u8bc6\u7b26\u7528\u4e8e\u533a\u5206\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u957f\u5ea6\uff08Length\uff09\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8868\u793a\u540e\u7eed\u6240\u6709\u5b57\u8282\u7684\u6570\u91cf\uff0c\u5373\u300c\u5355\u5143\u6807\u8bc6\u7b26\uff081 \u5b57\u8282\uff09+ PDU\uff08\u529f\u80fd\u7801 + \u6570\u636e\uff09\u300d\u3002TCP \u5c42\u6ca1\u6709 3.5 \u5b57\u7b26\u7684\u7a7a\u95f2\u68c0\u6d4b\u673a\u5236\uff0c\u957f\u5ea6\u5b57\u6bb5\u662f TCP \u6a21\u5f0f\u4e2d\u89e3\u6790\u5e27\u8fb9\u754c\u7684\u5173\u952e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5355\u5143\u6807\u8bc6\u7b26\uff08Unit Identifier\uff09\uff1a<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53 Modbus TCP \u62a5\u6587\u9700\u8981\u8f6c\u53d1\u5230\u4e32\u884c\u94fe\u8def\u4e0a\u7684 Modbus RTU \u8bbe\u5907\u65f6\uff0c\u5355\u5143\u6807\u8bc6\u7b26\u5c31\u5145\u5f53 RTU \u4ece\u7ad9\u5730\u5740\u7684\u89d2\u8272\u3002\u5728\u76f4\u8fde\u8bbe\u5907\uff08\u8bbe\u5907\u672c\u8eab\u5c31\u652f\u6301 Modbus TCP\uff09\u7684\u573a\u666f\u4e2d\uff0c\u6b64\u5b57\u6bb5\u901a\u5e38\u8bbe\u4e3a 0x01 \u6216 0xFF\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5bfb\u5740\u4e0e\u901a\u4fe1\u673a\u5236\u5bf9\u6bd4<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table>\n    <thead>\n        <tr><th>\u5bf9\u6bd4\u7ef4\u5ea6<\/th><th>Modbus RTU<\/th><th>Modbus TCP<\/th><\/tr>\n    <\/thead>\n    <tbody>\n        <tr><td>\u5bfb\u5740\u65b9\u5f0f<\/td><td>8 \u4f4d\u4ece\u7ad9\u5730\u5740\uff081-247\uff09<\/td><td>IP \u5730\u5740 + \u7aef\u53e3\u53f7\uff08\u9ed8\u8ba4 502\uff09<\/td><\/tr>\n        <tr><td>\u901a\u4fe1\u6a21\u5f0f<\/td><td>\u534a\u53cc\u5de5\uff08\u540c\u4e00\u65f6\u523b\u53ea\u80fd\u4e00\u65b9\u53d1\u9001\uff09<\/td><td>\u5168\u53cc\u5de5\uff08\u53ef\u540c\u65f6\u6536\u53d1\uff09<\/td><\/tr>\n        <tr><td>\u5e76\u53d1\u8fde\u63a5<\/td><td>\u4e0d\u652f\u6301\uff08\u603b\u7ebf\u5171\u4eab\uff09<\/td><td>\u652f\u6301\u591a\u4e2a TCP \u8fde\u63a5<\/td><\/tr>\n        <tr><td>\u4e3b\u7ad9\u6570\u91cf<\/td><td>1 \u4e2a\uff08\u603b\u7ebf\u4ef2\u88c1\u56f0\u96be\uff09<\/td><td>\u591a\u4e2a\uff08IP \u8def\u7531\u5929\u7136\u652f\u6301\uff09<\/td><\/tr>\n        <tr><td>\u5e7f\u64ad\u652f\u6301<\/td><td>\u652f\u6301\uff08\u5730\u5740 0\uff09<\/td><td>\u4e0d\u76f4\u63a5\u652f\u6301\uff08\u9700\u5e94\u7528\u5c42\u5904\u7406\uff09<\/td><\/tr>\n        <tr><td>\u9519\u8bef\u68c0\u6d4b<\/td><td>CRC-16<\/td><td>TCP \u6821\u9a8c\u548c<\/td><\/tr>\n    <\/tbody>\n<\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u6027\u80fd\u7279\u6027\u6df1\u5ea6\u5bf9\u6bd4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">5.1 \u901a\u4fe1\u901f\u7387\u5206\u6790<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e00\u6b21\u5178\u578b\u7684\u300c\u8bfb\u53d6 10 \u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\u300d\u64cd\u4f5c\u4e3a\u4f8b\uff0c\u5bf9\u6bd4\u4e24\u79cd\u6a21\u5f0f\u7684\u8017\u65f6\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n    <thead>\n        <tr><th>\u73af\u8282<\/th><th>Modbus RTU (9600bps)<\/th><th>Modbus TCP (100Mbps)<\/th><\/tr>\n    <\/thead>\n    <tbody>\n        <tr><td>\u8bf7\u6c42\u62a5\u6587\u5927\u5c0f<\/td><td>8 \u5b57\u8282<\/td><td>12 \u5b57\u8282\uff08MBAP+PDU\uff09<\/td><\/tr>\n        <tr><td>\u8bf7\u6c42\u4f20\u8f93\u65f6\u95f4<\/td><td>8 \u00d7 11 \/ 9600 \u2248 9.2ms<\/td><td>&lt; 0.01ms<\/td><\/tr>\n        <tr><td>\u54cd\u5e94\u62a5\u6587\u5927\u5c0f<\/td><td>25 \u5b57\u8282<\/td><td>29 \u5b57\u8282<\/td><\/tr>\n        <tr><td>\u54cd\u5e94\u4f20\u8f93\u65f6\u95f4<\/td><td>25 \u00d7 11 \/ 9600 \u2248 28.6ms<\/td><td>&lt; 0.01ms<\/td><\/tr>\n        <tr><td>\u4ece\u7ad9\u5904\u7406\u65f6\u95f4<\/td><td>1~10ms<\/td><td>1~10ms<\/td><\/tr>\n        <tr><td>\u5e27\u95f4\u9694<\/td><td>3.5 \u5b57\u7b26 \u2248 4ms<\/td><td>0<\/td><\/tr>\n        <tr><td><strong>\u603b\u8017\u65f6<\/strong><\/td><td><strong>\u2248 42-52ms<\/strong><\/td><td><strong>\u2248 1-10ms<\/strong><\/td><\/tr>\n    <\/tbody>\n<\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7ed3\u8bba\uff1a<\/strong>Modbus TCP \u7684\u5355\u6b21\u901a\u4fe1\u5ef6\u8fdf\u53ef\u4ee5\u6bd4 RTU \u6a21\u5f0f\u4f4e 5~50 \u500d\u3002\u5728\u9700\u8981\u9ad8\u9891\u6570\u636e\u91c7\u96c6\u7684\u573a\u666f\uff08\u5982\u632f\u52a8\u76d1\u6d4b\u3001\u9ad8\u901f\u8ba1\u6570\uff09\uff0cTCP \u6709\u660e\u663e\u7684\u6027\u80fd\u4f18\u52bf\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.2 \u591a\u8bbe\u5907\u5e76\u53d1\u901a\u4fe1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Modbus RTU \u6a21\u5f0f\u4e0b\uff0c\u7531\u4e8e RS-485 \u662f\u5171\u4eab\u603b\u7ebf\uff0c\u4e3b\u7ad9\u5fc5\u987b\u4ee5\u8f6e\u8be2\u65b9\u5f0f\u9010\u4e2a\u8bbf\u95ee\u4ece\u7ad9\u3002\u5982\u679c\u6709 30 \u4e2a\u4ece\u7ad9\uff0c\u6bcf\u4e2a 50ms\uff0c\u4e00\u8f6e\u5c31\u662f 1.5 \u79d2\u2014\u2014\u8fd9\u5bf9\u4e8e\u67d0\u4e9b\u5b9e\u65f6\u63a7\u5236\u573a\u666f\u662f\u65e0\u6cd5\u63a5\u53d7\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Modbus TCP \u6a21\u5f0f\u4e0b\uff0c\u4e3b\u7ad9\u53ef\u4ee5\u540c\u65f6\u5efa\u7acb\u591a\u4e2a TCP \u8fde\u63a5\uff0c\u5e76\u53d1\u5730\u4e0e\u591a\u4e2a\u4ece\u7ad9\u901a\u4fe1\u3002\u8fd9\u4f7f\u5f97 TCP \u6a21\u5f0f\u5728\u5927\u89c4\u6a21\u6570\u636e\u91c7\u96c6\u7cfb\u7edf\u4e2d\u5177\u6709\u538b\u5012\u6027\u4f18\u52bf\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001Modbus ASCII \u6a21\u5f0f\u7b80\u4ecb<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9664\u4e86 RTU \u548c TCP\uff0cModbus \u8fd8\u6709\u4e00\u79cd ASCII \u4f20\u8f93\u6a21\u5f0f\u3002ASCII \u6a21\u5f0f\u5c06\u6bcf\u4e2a\u5b57\u8282\u7f16\u7801\u4e3a\u4e24\u4e2a\u53ef\u6253\u5370\u7684 ASCII \u5b57\u7b26\uff080-9, A-F\uff09\uff0c\u4f7f\u7528 LRC \u6821\u9a8c\uff0c\u4ee5\u5192\u53f7\uff08:\uff09\u5f00\u5934\u3001\u56de\u8f66\u6362\u884c\uff08CRLF\uff09\u7ed3\u5c3e\u3002\u867d\u7136\u6548\u7387\u6700\u4f4e\uff08\u540c\u6837\u6570\u636e\u91cf\u9700\u8981\u7ea6 2 \u500d\u7684\u5b57\u8282\u6570\uff09\uff0c\u4f46 ASCII \u6a21\u5f0f\u7684\u62a5\u6587\u662f\u4eba\u7c7b\u53ef\u8bfb\u7684\uff0c\u5728\u8c03\u8bd5\u548c\u6559\u5b66\u573a\u666f\u4e2d\u6709\u72ec\u7279\u4f18\u52bf\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ASCII \u6a21\u5f0f\u62a5\u6587\u793a\u4f8b\uff08\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668 108\uff0c1 \u4e2a\uff09:\nRTU:   01 03 00 6B 00 01 [CRC]\nASCII: :0103006B0001[LRC]rn\n\n\u2192 \u540c\u6837\u7684 PDU\uff0cASCII \u9700\u8981 19 \u4e2a\u5b57\u7b26\uff08\u542b\u5e27\u5934\u5e27\u5c3e\uff09\uff0cRTU \u53ea\u8981 8 \u4e2a\u5b57\u8282<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u9009\u578b\u51b3\u7b56\u6307\u5357<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">7.1 \u4f18\u5148\u9009\u62e9 Modbus RTU \u7684\u573a\u666f<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n    <li><strong>\u5df2\u6709 RS-485 \u5e03\u7ebf\uff1a<\/strong>\u5de5\u5382\u73b0\u573a\u5df2\u7ecf\u94fa\u8bbe\u4e86 RS-485 \u603b\u7ebf\uff0c\u6539\u9020\u4e3a\u4ee5\u592a\u7f51\u6210\u672c\u592a\u9ad8<\/li>\n    <li><strong>\u8bbe\u5907\u6570\u91cf\u5c11\uff08\uff1c20 \u4e2a\uff09\uff1a<\/strong>\u8f6e\u8be2\u5ef6\u8fdf\u5728\u53ef\u63a5\u53d7\u8303\u56f4\u5185<\/li>\n    <li><strong>\u5bf9\u5b9e\u65f6\u6027\u8981\u6c42\u4e0d\u9ad8\uff1a<\/strong>\u79d2\u7ea7\u6216\u5206\u949f\u7ea7\u7684\u6570\u636e\u91c7\u96c6\u5373\u53ef\u6ee1\u8db3\u9700\u6c42<\/li>\n    <li><strong>\u4f4e\u6210\u672c\u573a\u666f\uff1a<\/strong>\u8bbe\u5907\u672c\u8eab\u53ea\u6709 RS-485 \u63a5\u53e3\uff0c\u52a0\u88c5\u4ee5\u592a\u7f51\u6a21\u5757\u589e\u52a0\u6210\u672c<\/li>\n    <li><strong>\u8bbe\u5907\u95f4\u8ddd\u5927\uff08100m~1200m\uff09\uff1a<\/strong>RS-485 \u65e0\u9700\u4e2d\u7ee7\u5373\u53ef\u8986\u76d6\u8f83\u957f\u8ddd\u79bb<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">7.2 \u4f18\u5148\u9009\u62e9 Modbus TCP \u7684\u573a\u666f<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n    <li><strong>\u9ad8\u901f\u6570\u636e\u91c7\u96c6\uff1a<\/strong>\u9700\u8981\u6beb\u79d2\u7ea7\u751a\u81f3\u66f4\u5feb\u7684\u6570\u636e\u5237\u65b0<\/li>\n    <li><strong>\u8bbe\u5907\u6570\u91cf\u591a\uff08\uff1e30 \u4e2a\uff09\uff1a<\/strong>\u8f6e\u8be2\u5ef6\u8fdf\u5df2\u6210\u4e3a\u74f6\u9888<\/li>\n    <li><strong>\u5df2\u6709\u4ee5\u592a\u7f51\u57fa\u7840\u8bbe\u65bd\uff1a<\/strong>\u5de5\u5382\u5df2\u94fa\u8bbe\u4ee5\u592a\u7f51\u7ebf\u7f06<\/li>\n    <li><strong>\u8fdc\u7a0b\u76d1\u63a7\uff1a<\/strong>\u9700\u8981\u901a\u8fc7\u4e92\u8054\u7f51\u8bbf\u95ee\u8bbe\u5907\uff08\u53ef\u7ed3\u5408 VPN\uff09<\/li>\n    <li><strong>\u591a\u4e3b\u7ad9\u8bbf\u95ee\uff1a<\/strong>\u591a\u4e2a\u4e0a\u4f4d\u673a\u9700\u8981\u540c\u65f6\u8bbf\u95ee\u540c\u4e00\u4e2a\u4ece\u7ad9<\/li>\n    <li><strong>\u4e0e IT \u7cfb\u7edf\u96c6\u6210\uff1a<\/strong>\u9700\u8981\u4e0e\u6570\u636e\u5e93\u3001MES\u3001ERP \u7b49 IT \u7cfb\u7edf\u5bf9\u63a5<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">7.3 \u6df7\u5408\u67b6\u6784\uff1a\u7f51\u5173\u6865\u63a5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5b9e\u9645\u5de5\u7a0b\u4e2d\uff0c\u6700\u5e38\u89c1\u7684\u65b9\u6848\u662f\u6df7\u5408\u67b6\u6784\u2014\u2014\u4f7f\u7528 Modbus TCP \u5230 RTU \u7684\u7f51\u5173\u8bbe\u5907\uff0c\u5c06\u5927\u91cf RS-485 \u8bbe\u5907\u63a5\u5165\u4ee5\u592a\u7f51\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510    Modbus TCP     \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510    Modbus RTU     \u250c\u2500\u2500\u2500\u2500\u2510\u250c\u2500\u2500\u2500\u2500\u2510\u250c\u2500\u2500\u2500\u2500\u2510\n\u2502   SCADA   \u2502\u25c4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba\u2502  TCP\/RTU  \u2502\u25c4\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba\u2502\u4ece\u7ad91\u2502\u2502\u4ece\u7ad92\u2502\u2502\u4ece\u7ad9N\u2502\n\u2502  \u670d\u52a1\u5668   \u2502    \u4ee5\u592a\u7f51          \u2502  \u7f51\u5173     \u2502   RS-485 \u603b\u7ebf    \u2514\u2500\u2500\u2500\u2500\u2518\u2514\u2500\u2500\u2500\u2500\u2518\u2514\u2500\u2500\u2500\u2500\u2518\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                    \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u79cd\u67b6\u6784\u517c\u5177\u4e86 RTU \u7684\u4f4e\u8bbe\u5907\u6210\u672c\u548c TCP \u7684\u9ad8\u6027\u80fd\u4e0e\u7075\u6d3b\u6027\uff0c\u662f\u5f53\u524d\u5de5\u4e1a\u7269\u8054\u7f51\u9879\u76ee\u7684\u4e3b\u6d41\u65b9\u6848\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u5b89\u5168\u8003\u91cf<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u672c\u8d28\u4e0a\u662f\u300c\u88f8\u5954\u300d\u7684\u2014\u2014\u6ca1\u6709\u4efb\u4f55\u5185\u7f6e\u7684\u5b89\u5168\u673a\u5236\u3002\u5728 RS-485 \u603b\u7ebf\u4e0a\uff0c\u4efb\u4f55\u63a5\u5165\u603b\u7ebf\u7684\u8bbe\u5907\u90fd\u53ef\u4ee5\u8bfb\u53d6\u6216\u4fee\u6539\u4efb\u610f\u62a5\u6587\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus TCP \u540c\u6837\u7f3a\u4e4f\u5185\u7f6e\u5b89\u5168\u673a\u5236\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7 TLS\uff08\u4f20\u8f93\u5c42\u5b89\u5168\uff09\u8fdb\u884c\u52a0\u5bc6\u548c\u8ba4\u8bc1\u3002Modbus \u5b89\u5168\u534f\u8bae\uff08\u4f7f\u7528\u7aef\u53e3 802\uff09\u6b63\u5f0f\u5c06 TLS \u5c01\u88c5\u6807\u51c6\u5316\uff0c\u63d0\u4f9b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n    <li>X.509v3 \u8bc1\u4e66\u8ba4\u8bc1<\/li>\n    <li>TLS \u52a0\u5bc6\u901a\u4fe1<\/li>\n    <li>\u6d88\u606f\u5b8c\u6574\u6027\u4fdd\u62a4<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5173\u952e\u57fa\u7840\u8bbe\u65bd\u4e2d\uff0c\u5efa\u8bae\u4f18\u5148\u4f7f\u7528 Modbus \u5b89\u5168\u534f\u8bae\uff08\u7aef\u53e3 802\uff09\u800c\u975e\u6807\u51c6 Modbus TCP\uff08\u7aef\u53e3 502\uff09\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e5d\u3001\u5e38\u89c1\u95ee\u9898 FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Q1: Modbus RTU \u8bbe\u5907\u53ef\u4ee5\u76f4\u63a5\u8fde\u63a5\u5230 Modbus TCP \u7f51\u7edc\u5417\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0d\u80fd\u76f4\u63a5\u8fde\u63a5\u3002\u9700\u8981\u7ecf\u8fc7 Modbus TCP\/RTU \u7f51\u5173\u8fdb\u884c\u534f\u8bae\u8f6c\u6362\u3002\u7f51\u5173\u8d1f\u8d23\u6dfb\u52a0\/\u79fb\u9664 MBAP \u62a5\u5934\uff0c\u4ee5\u53ca CRC \u6821\u9a8c\u7684\u751f\u6210\u548c\u9a8c\u8bc1\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q2: \u540c\u4e00\u4e2a\u7f51\u7edc\u4e2d\u80fd\u540c\u65f6\u4f7f\u7528 Modbus RTU \u548c Modbus TCP \u5417\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\uff0c\u901a\u8fc7\u7f51\u5173\u6865\u63a5\u5373\u53ef\u3002\u7f51\u5173\u4e00\u4fa7\u8fde\u63a5\u4ee5\u592a\u7f51\uff08Modbus TCP\uff09\uff0c\u53e6\u4e00\u4fa7\u8fde\u63a5 RS-485 \u603b\u7ebf\uff08Modbus RTU\uff09\u3002\u8fd9\u662f\u5de5\u4e1a\u73b0\u573a\u6700\u5e38\u89c1\u7684\u6df7\u5408\u67b6\u6784\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q3: \u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u8bbe\u5907\u662f Modbus RTU \u8fd8\u662f Modbus TCP\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u7269\u7406\u63a5\u53e3\uff1aRS-232\/RS-485 \u63a5\u53e3 \u2192 Modbus RTU\uff1bRJ45 \u4ee5\u592a\u7f51\u63a5\u53e3 \u2192 Modbus TCP\u3002\u4f46\u4e5f\u6709\u8bbe\u5907\u540c\u65f6\u5177\u5907\u4e24\u79cd\u63a5\u53e3\uff08\u5982\u9ad8\u7ea7 PLC\uff09\uff0c\u9700\u8981\u67e5\u770b\u8bbe\u5907\u624b\u518c\u786e\u8ba4\u652f\u6301\u7684\u534f\u8bae\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q4: Modbus TCP \u7684\u9ed8\u8ba4\u7aef\u53e3 502 \u88ab\u5c01\u4e86\u600e\u4e48\u529e\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u591a\u6570 Modbus TCP \u8bbe\u5907\u652f\u6301\u4fee\u6539\u9ed8\u8ba4\u7aef\u53e3\u3002\u4e5f\u53ef\u4ee5\u4f7f\u7528 VPN \u5728\u9632\u706b\u5899\u4e4b\u95f4\u5efa\u7acb\u5b89\u5168\u96a7\u9053\u3002Modbus \u5b89\u5168\u534f\u8bae\u4f7f\u7528 802 \u7aef\u53e3\u4f5c\u4e3a\u66ff\u4ee3\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5341\u3001\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u548c Modbus TCP \u4e0d\u662f\u7ade\u4e89\u5173\u7cfb\uff0c\u800c\u662f\u4e92\u8865\u5173\u7cfb\u3002RTU \u5728\u8bbe\u5907\u7aef\u6210\u672c\u4f4e\u3001\u5e03\u7ebf\u7b80\u5355\uff0cTCP \u5728\u7f51\u7edc\u4fa7\u901f\u5ea6\u5feb\u3001\u6269\u5c55\u6027\u597d\u3002\u7406\u89e3\u4e24\u8005\u7684\u5dee\u5f02\u548c\u5404\u81ea\u9002\u7528\u573a\u666f\uff0c\u624d\u80fd\u5728\u5de5\u4e1a\u901a\u4fe1\u7cfb\u7edf\u8bbe\u8ba1\u4e2d\u505a\u51fa\u6b63\u786e\u7684\u67b6\u6784\u51b3\u7b56\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a<\/strong>RTU \u662f\u300c\u73b0\u573a\u603b\u7ebf\u300d\u7684\u9009\u62e9\uff0cTCP \u662f\u300c\u4fe1\u606f\u9ad8\u901f\u8def\u300d\u7684\u9009\u62e9\uff0c\u7f51\u5173\u662f\u628a\u4e24\u8005\u7c98\u5408\u5728\u4e00\u8d77\u7684\u6865\u6881\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u76f8\u5173\u9605\u8bfb\uff1a<\/strong>Modbus \u4e32\u884c\u7ebf\u901a\u4fe1\u5b9e\u6218\u6307\u5357 | Modbus TCP\/IP \u7f51\u7edc\u90e8\u7f72\u4e0e\u4f18\u5316 | Modbus \u5b89\u5168\u534f\u8bae\u6df1\u5ea6\u89e3\u6790<\/p>\n\n<span id=\"magicpostMarker\"><\/span>","protected":false},"excerpt":{"rendered":"<p>Modbus RTU \u4e0e Modbus TCP \u6df1\u5ea6\u5bf9\u6bd4\uff1a\u4ece&#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[1],"tags":[3061,650,1087,3060],"class_list":["post-44506","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-mbap","tag-modbus-rtu","tag-modbus-tcp","tag-modbus"],"_links":{"self":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/44506","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/comments?post=44506"}],"version-history":[{"count":0,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/44506\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/media?parent=44506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/categories?post=44506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/tags?post=44506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}