{"id":6525,"date":"2022-03-07T16:14:26","date_gmt":"2022-03-07T08:14:26","guid":{"rendered":"https:\/\/www.modbus.cn\/?p=6525"},"modified":"2026-07-01T08:55:50","modified_gmt":"2026-07-01T00:55:50","slug":"modbus-tong-xun-cuo-wu-chang-yong-jian-ce-fang-shi","status":"publish","type":"post","link":"https:\/\/www.modbus.cn\/en\/6525.html","title":{"rendered":"Modbus\u901a\u8baf\u9519\u8bef\u5e38\u7528\u68c0\u6d4b\u65b9\u5f0f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u6765\u6e90\uff1aModbus\u4e2d\u6587\u7f51\uff08modbus.cn\uff09 \u2014\u2014 \u56fd\u5185\u9886\u5148\u7684Modbus\u901a\u4fe1\u534f\u8bae\u6280\u672f\u793e\u533a<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\uff1aModbus \u901a\u8baf\u9519\u8bef\u7684\u68c0\u6d4b\u4e0e\u8bca\u65ad\uff1a\u4ece\u5947\u5076\u6821\u9a8c\u5230\u5f02\u5e38\u7801\u7684\u5b8c\u6574\u4f53\u7cfb \u00b7 \u4f5c\u8005\uff1amodbus\u6280\u672f\u56e2\u961f \u00b7 \u53d1\u5e03\u4e8e 2026-07-01<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6458\u8981\uff1aModbus \u534f\u8bae\u7684\u9519\u8bef\u68c0\u6d4b\u5206\u4e3a\u4e09\u4e2a\u5c42\u6b21\u2014\u2014\u5b57\u7b26\u7ea7\u7684\u5947\u5076\u6821\u9a8c\u3001\u5e27\u7ea7\u7684 LRC\/CRC \u6821\u9a8c\u3001\u4ee5\u53ca\u5e94\u7528\u5c42\u7684\u5f02\u5e38\u54cd\u5e94\u7801\u548c\u8d85\u65f6\u673a\u5236\u3002\u672c\u6587\u9010\u4e00\u62c6\u89e3\u6bcf\u79cd\u68c0\u6d4b\u65b9\u5f0f\u7684\u5de5\u4f5c\u539f\u7406\u3001\u7b97\u6cd5\u5b9e\u73b0\uff08\u542b\u53ef\u8fd0\u884c\u7684 C\/Python \u4ee3\u7801\uff09\u548c\u5b9e\u9645\u8c03\u8bd5\u7528\u9014\uff0c\u5e76\u7ed9\u51fa\u5b8c\u6574\u7684\u5f02\u5e38\u7801\u901f\u67e5\u8868\u548c\u6392\u969c\u6d41\u7a0b\u3002\u5173\u952e\u8bcd\uff1aModbus CRC\u3001LRC \u6821\u9a8c\u3001\u5947\u5076\u6821\u9a8c\u3001Modbus \u5f02\u5e38\u7801\u3001Modbus \u9519\u8bef\u68c0\u6d4b\u3001CRC16 Modbus\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<p class=\"wp-block-paragraph\">\u5728 RS-485 \u603b\u7ebf\u4e0a\u4f20\u8f93\u4e00\u4e2a Modbus \u5e27\uff0c\u5c31\u50cf\u5728\u5608\u6742\u7684\u8f66\u95f4\u91cc\u558a\u8bdd\u2014\u2014\u558a\u51fa\u53bb\u7684\u662f <code>01 03 00 00 00 01<\/code>\uff0c\u5bf9\u7aef\u6536\u5230\u7684\u53ef\u80fd\u53d8\u6210\u4e86 <code>01 03 00 00 00 03<\/code>\u3002\u4e00\u4e2a\u6bd4\u7279\u7ffb\u8f6c\uff0c\u6e29\u5ea6\u8bfb\u6570\u5c31\u4ece 25\u00b0C \u53d8\u6210 26\u00b0C\uff0c\u6216\u8005\u67d0\u53f0\u9600\u95e8\u300c\u4e3a\u4ec0\u4e48\u4e0d\u52a8\u300d\u7684\u539f\u56e0\u5c31\u57cb\u5728\u8fd9\u91cc\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">Modbus \u4ece 1979 \u5e74\u8bde\u751f\u5c31\u5e26\u7740\u4e00\u5957\u5206\u5c42\u9519\u8bef\u68c0\u6d4b\u673a\u5236\uff1a\u6bcf\u4e2a\u5b57\u7b26\u7528\u5947\u5076\u6821\u9a8c\u6321\u4f4f\u6bd4\u7279\u9519\u8bef\uff0c\u6574\u5e27\u6570\u636e\u7528 CRC\uff08RTU \u6a21\u5f0f\uff09\u6216 LRC\uff08ASCII \u6a21\u5f0f\uff09\u515c\u5e95\uff0c\u5e94\u7528\u5c42\u518d\u901a\u8fc7\u5f02\u5e38\u54cd\u5e94\u7801\u544a\u8bc9\u4e3b\u7ad9\u300c\u4f60\u7684\u8bf7\u6c42\u6709\u95ee\u9898\u300d\u3002\u8fd9\u4e09\u5c42\u673a\u5236\u914d\u5408\u8d85\u65f6\u91cd\u53d1\u7b56\u7565\uff0c\u6784\u6210\u4e86 Modbus \u5728\u5de5\u4e1a\u73b0\u573a\u5b58\u6d3b\u8fd1\u4e94\u5341\u5e74\u4e0d\u5012\u7684\u53ef\u9760\u6027\u57fa\u7840\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5766\u7387\u8bf4\uff0cModbus \u7684\u9519\u8bef\u68c0\u6d4b\u4e0d\u662f\u5bc6\u7801\u5b66\u7ea7\u522b\u7684\u2014\u2014CRC16 \u4e0d\u80fd\u9632\u7be1\u6539\uff0cLRC \u5bf9\u8fde\u7eed\u5076\u6570\u4f4d\u9519\u8bef\u53ef\u80fd\u6f0f\u68c0\u3002\u4f46\u5728\u4e00\u4e2a 9600bps\u3001\u51e0\u5341\u7c73 RS-485 \u603b\u7ebf\u7684\u7269\u7406\u73af\u5883\u4e0b\uff0c\u8fd9\u4e9b\u673a\u5236\u5df2\u7ecf\u591f\u7528\u4e86\u3002\u5b83\u4eec\u7684\u4ef7\u503c\u4e0d\u5728\u4e8e\u7406\u8bba\u5b8c\u7f8e\uff0c\u800c\u5728\u4e8e\u5b9e\u73b0\u7b80\u5355\u3001\u8ba1\u7b97\u5f00\u9500\u4f4e\u2014\u2014\u4e00\u4e2a 8 \u4f4d\u5355\u7247\u673a\u7528\u4e0d\u5230 100 \u5b57\u8282\u7684\u4ee3\u7801\u5c31\u80fd\u5b8c\u6210 CRC16 \u8ba1\u7b97\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u9519\u8bef\u68c0\u6d4b\u7684\u4e09\u5c42\u67b6\u6784<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Modbus \u4e32\u884c\u901a\u4fe1\u7684\u9519\u8bef\u68c0\u6d4b\u5206\u6210\u4e09\u4e2a\u5c42\u7ea7\uff0c\u4ece\u4e0a\u5230\u4e0b\u8986\u76d6\u6574\u4e2a\u901a\u4fe1\u6808\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u5e94\u7528\u5c42\uff1a\u5f02\u5e38\u54cd\u5e94\u7801 + \u8d85\u65f6\u91cd\u53d1\n   \u2193\n\u5e27\u5c42  \uff1aCRC-16\uff08RTU\uff09\u6216 LRC\uff08ASCII\uff09\n   \u2193\n\u5b57\u7b26\u5c42\uff1a\u5947\u5076\u6821\u9a8c\uff08Even\/Odd\/None\uff09<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5b57\u7b26\u5c42<\/strong>\u4fdd\u62a4\u6bcf\u4e2a\u5b57\u8282\u7684\u4f20\u8f93\u6b63\u786e\u6027\u2014\u2014\u4e00\u4e2a UART \u5e27\u91cc\u7684 8 \u4e2a\u6570\u636e\u4f4d\u52a0\u4e0a\u4e00\u4e2a\u6821\u9a8c\u4f4d\uff0c\u786c\u4ef6\u81ea\u52a8\u5b8c\u6210\u6821\u9a8c\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e27\u5c42<\/strong>\u4fdd\u62a4\u6574\u6761 Modbus \u6d88\u606f\u7684\u5b8c\u6574\u6027\u2014\u2014\u4ece\u7ad9\u5730\u5740\u5230\u6700\u540e\u4e00\u4e2a\u6570\u636e\u5b57\u8282\uff0c\u5168\u90e8\u53c2\u4e0e\u8ba1\u7b97\u3002\u5982\u679c\u5e27\u6821\u9a8c\u4e0d\u901a\u8fc7\uff0c\u4ece\u8bbe\u5907\u9759\u9ed8\u4e22\u5f03\u8fd9\u6761\u6d88\u606f\uff0c\u4e0d\u56de\u590d\u4efb\u4f55\u5185\u5bb9\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e94\u7528\u5c42<\/strong>\u5904\u7406\u300c\u7269\u7406\u5c42\u6ca1\u95ee\u9898\uff0c\u4f46\u903b\u8f91\u4e0a\u6709\u95ee\u9898\u300d\u7684\u60c5\u51b5\u2014\u2014\u6bd4\u5982\u4f60\u8bf7\u6c42\u7684\u529f\u80fd\u7801\u8bbe\u5907\u4e0d\u652f\u6301\u3001\u5bc4\u5b58\u5668\u5730\u5740\u4e0d\u5b58\u5728\u3001\u6570\u636e\u503c\u8d85\u51fa\u8303\u56f4\u3002\u8fd9\u4e9b\u9519\u8bef\u901a\u8fc7\u5f02\u5e38\u54cd\u5e94\u7801\u544a\u77e5\u4e3b\u7ad9\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u4e09\u5c42\u5404\u53f8\u5176\u804c\uff0c\u4f46\u8c03\u8bd5\u7684\u65f6\u5019\u5de5\u7a0b\u5e08\u66f4\u5bb9\u6613\u770b\u5230\u5e94\u7528\u5c42\u7684\u5f02\u5e38\u7801\uff0c\u800c\u5ffd\u7565\u4e86\u7269\u7406\u5c42\u7684\u5947\u5076\u6821\u9a8c\u9519\u8bef\u2014\u2014\u56e0\u4e3a\u5947\u5076\u6821\u9a8c\u9519\u8bef\u5728\u4ece\u8bbe\u5907\u786c\u4ef6\u5c42\u9762\u5c31\u88ab\u4e22\u5f03\u4e86\uff0c\u4f60\u6839\u672c\u770b\u4e0d\u5230\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u5b57\u7b26\u5c42\uff1a\u5947\u5076\u6821\u9a8c<\/h2>\n\n\n<h3 class=\"wp-block-heading\">2.1 \u539f\u7406<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5947\u5076\u6821\u9a8c\u662f\u5728\u6bcf\u4e2a UART \u5b57\u7b26\u5e27\u4e2d\u9644\u52a0\u4e00\u4e2a\u6821\u9a8c\u4f4d\uff0c\u4f7f\u5f97\u6574\u4e2a\u5e27\u4e2d\u300c1\u300d\u7684\u603b\u6570\u4e3a\u5947\u6570\uff08\u5947\u6821\u9a8c\uff0cOdd\uff09\u6216\u5076\u6570\uff08\u5076\u6821\u9a8c\uff0cEven\uff09\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">Modbus \u7684\u5b57\u7b26\u5e27\u5b9a\u4e49\u56e0\u6a21\u5f0f\u800c\u5f02\uff1a<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6a21\u5f0f<\/th><th>\u8d77\u59cb\u4f4d<\/th><th>\u6570\u636e\u4f4d<\/th><th>\u6821\u9a8c\u4f4d<\/th><th>\u505c\u6b62\u4f4d<\/th><th>\u603b\u4f4d\u6570<\/th><\/tr><\/thead><tbody><tr><td>RTU\uff08\u6709\u6821\u9a8c\uff09<\/td><td>1<\/td><td>8<\/td><td>1<\/td><td>1<\/td><td>11<\/td><\/tr><tr><td>RTU\uff08\u65e0\u6821\u9a8c\uff09<\/td><td>1<\/td><td>8<\/td><td>0<\/td><td>2<\/td><td>11<\/td><\/tr><tr><td>ASCII<\/td><td>1<\/td><td>7<\/td><td>1<\/td><td>1<\/td><td>10<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f RTU \u65e0\u6821\u9a8c\u65f6\u7528 2 \u4e2a\u505c\u6b62\u4f4d\u6765\u51d1\u603b\u4f4d\u6570\u2014\u2014\u8fd9\u662f\u786c\u6027\u8981\u6c42\uff0c\u5f88\u591a\u4eba\u5728\u914d\u7f6e\u4e32\u53e3\u53c2\u6570\u65f6\u9009\u4e86 No Parity \u4f46\u5fd8\u4e86\u628a\u505c\u6b62\u4f4d\u4ece 1 \u6539\u6210 2\uff0c\u7ed3\u679c\u901a\u4fe1\u4e0d\u7a33\u5b9a\u4f46\u53c8\u4e0d\u81f3\u4e8e\u5b8c\u5168\u4e0d\u901a\uff0c\u975e\u5e38\u96be\u67e5\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">2.2 \u8ba1\u7b97\u793a\u4f8b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u53d6\u4e00\u4e2a\u5b57\u8282\uff1a<code>11000101<\/code>\u3002\u5176\u4e2d 1 \u7684\u4e2a\u6570\u662f 4\uff08\u5076\u6570\uff09\u3002<\/p>\n\n\n<ul class=\"wp-block-list\"><li>\u5076\u6821\u9a8c \u2192 \u6821\u9a8c\u4f4d = 0\uff0c\u4fdd\u6301 1 \u7684\u603b\u6570\u4e3a\u5076\u6570\uff084 \u4e2a\uff09<\/li><li>\u5947\u6821\u9a8c \u2192 \u6821\u9a8c\u4f4d = 1\uff0c\u4f7f 1 \u7684\u603b\u6570\u4e3a\u5947\u6570\uff085 \u4e2a\uff09<\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\">\u786c\u4ef6 UART \u5728\u53d1\u9001\u65f6\u81ea\u52a8\u8ba1\u7b97\u5e76\u586b\u5165\u6821\u9a8c\u4f4d\uff0c\u63a5\u6536\u65f6\u81ea\u52a8\u6821\u9a8c\u3002\u5982\u679c\u63a5\u6536\u7aef\u6821\u9a8c\u4e0d\u901a\u8fc7\uff0cUART \u786c\u4ef6\u4f1a\u6807\u8bb0\u4e00\u4e2a\u5947\u5076\u6821\u9a8c\u9519\u8bef\uff08Parity Error\uff09\uff0c\u4f46\u4e0d\u4f1a\u81ea\u52a8\u4e22\u5f03\u6570\u636e\u2014\u2014\u8981\u4e0d\u8981\u4e22\u5f03\u7531\u8f6f\u4ef6\u51b3\u5b9a\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">2.3 \u5947\u5076\u6821\u9a8c\u7684\u5c40\u9650<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5947\u5076\u6821\u9a8c\u53ea\u80fd\u68c0\u6d4b<strong>\u5947\u6570\u4e2a\u6bd4\u7279\u9519\u8bef<\/strong>\u3002\u5982\u679c\u4f20\u8f93\u4e2d\u6070\u597d\u7ffb\u8f6c\u4e86 2 \u4e2a\u6bd4\u7279\uff0c\u5947\u5076\u6027\u4e0d\u53d8\uff0c\u6821\u9a8c\u901a\u8fc7\uff0c\u4f46\u6570\u636e\u5df2\u7ecf\u9519\u4e86\u3002\u5728 RS-485 \u4e0a\uff0c\u7535\u78c1\u5e72\u6270\u5bfc\u81f4\u5355\u6bd4\u7279\u7ffb\u8f6c\u7684\u6982\u7387\u8fdc\u9ad8\u4e8e\u591a\u6bd4\u7279\u540c\u65f6\u7ffb\u8f6c\uff0c\u6240\u4ee5\u5947\u5076\u6821\u9a8c\u5728\u5b9e\u9645\u4e2d\u8fd8\u662f\u6709\u7528\u7684\u2014\u2014\u4f46\u5b83\u7edd\u4e0d\u662f\u4e07\u80fd\u7684\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8c03\u8bd5\u5efa\u8bae<\/strong>\uff1a\u5982\u679c\u4f60\u6000\u7591\u7ebf\u8def\u8d28\u91cf\u6709\u95ee\u9898\uff0c\u7528\u903b\u8f91\u5206\u6790\u4eea\u6293 UART \u5e27\u770b\u6bcf\u4e2a\u5b57\u7b26\u7684\u5947\u5076\u6821\u9a8c\u9519\u8bef\u6807\u8bb0\u3002\u4e32\u53e3\u52a9\u624b\uff08\u5982 SSCOM\uff09\u53ef\u4ee5\u663e\u793a\u5947\u5076\u9519\u8bef\u6b21\u6570\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u5982\u679c\u4e00\u76f4\u5728\u6da8\uff0c\u8bf4\u660e\u4f60\u7684\u7269\u7406\u7ebf\u8def\u6709\u7535\u78c1\u5e72\u6270\u95ee\u9898\u2014\u2014\u53ef\u80fd\u662f\u7535\u7f06\u4e0d\u5c4f\u853d\u3001\u548c\u53d8\u9891\u5668\u8d70\u5230\u4e00\u4e2a\u6865\u67b6\u91cc\u4e86\u3001\u6216\u8005\u7ec8\u7aef\u7535\u963b\u6ca1\u63a5\u5bfc\u81f4\u4fe1\u53f7\u53cd\u5c04\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5e27\u5c42\uff08\u4e00\uff09\uff1aLRC \u6821\u9a8c \u2014\u2014 Modbus ASCII \u6a21\u5f0f<\/h2>\n\n\n<h3 class=\"wp-block-heading\">3.1 LRC \u662f\u4ec0\u4e48<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u7eb5\u5411\u5197\u4f59\u6821\u9a8c\uff08Longitudinal Redundancy Check\uff0cLRC\uff09\u662f Modbus ASCII \u6a21\u5f0f\u4f7f\u7528\u7684\u5e27\u6821\u9a8c\u7b97\u6cd5\u3002\u5b83\u662f\u4e00\u4e2a 8 \u4f4d\uff081 \u5b57\u8282\uff09\u7684\u6821\u9a8c\u7801\uff0c\u4f4d\u4e8e\u5e27\u7684\u672b\u5c3e\uff0c\u6821\u9a8c\u8303\u56f4\u662f\u4ece\u7ad9\u5730\u5740\u5230\u6570\u636e\u533a\u7684\u6240\u6709\u5b57\u8282\uff0c\u4e0d\u5305\u62ec\u5e27\u5934\uff08\u5192\u53f7 <code>:<\/code>\uff09\u548c\u5e27\u5c3e\uff08\u56de\u8f66\u6362\u884c\u7b26 CR\/LF\uff09\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">3.2 Modbus ASCII \u5e27\u7ed3\u6784<\/h3>\n\n\n<pre class=\"wp-block-code\"><code>:   01  03  21  02  00  02  D7  CR  LF\n\u2502   \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518   \u2502\n\u5e27\u5934       LRC \u6821\u9a8c\u8303\u56f4      LRC\u7801<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u4e2a\u5b8c\u6574\u7684 Modbus ASCII \u8bf7\u6c42\u5e27\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>:0103020002F8rn<\/code><\/pre>\n\n\n<h3 class=\"wp-block-heading\">3.3 LRC \u7b97\u6cd5<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u7b97\u6cd5\u6781\u5176\u7b80\u5355\u2014\u2014\u4e09\u6b65\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\"><li>\u5c06\u5730\u5740\u7801\u5230\u6570\u636e\u533a\u7684\u6240\u6709\u5b57\u8282\u76f8\u52a0\u6c42\u548c<\/li><li>\u53d6\u548c\u7684\u4f4e 8 \u4f4d\uff08\u6a21 256\uff09<\/li><li>\u53d6\u5176\u8865\u7801\uff08256 \u51cf\u53bb\u8fd9\u4e2a\u503c\uff0c\u6216\u8005\u6309\u4f4d\u53d6\u53cd\u540e\u52a0 1\uff09<\/li><\/ol>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a\u62a5\u6587 <code>: 01 03 21 02 00 02<\/code><\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u6c42\u548c\uff1a0x01 + 0x03 + 0x21 + 0x02 + 0x00 + 0x02 = 0x29\n\u4f4e 8 \u4f4d\uff1a0x29\n\u8865\u7801\uff1a256 - 0x29 = 0xD7\nLRC \u6821\u9a8c\u7801 = D7<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u5b8c\u6574\u5e27\u4e3a\uff1a<code>: 01 03 21 02 00 02 D7 rn<\/code><\/p>\n\n\n<h3 class=\"wp-block-heading\">3.4 LRC \u7684 C \u8bed\u8a00\u5b9e\u73b0<\/h3>\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u8ba1\u7b97 Modbus ASCII LRC \u6821\u9a8c\u7801\n * buf: \u9700\u8981\u6821\u9a8c\u7684\u6570\u636e\uff08\u4ece\u5730\u5740\u7801\u5230\u6570\u636e\u533a\u7684\u6240\u6709\u5b57\u8282\uff09\n * len: \u5b57\u8282\u6570\n * \u8fd4\u56de\u503c: 1 \u5b57\u8282 LRC \u6821\u9a8c\u7801\n *\/\nunsigned char LRC(unsigned char *buf, unsigned short len)\n{\n    unsigned char lrc = 0;\n    while (len--) {\n        lrc += *buf++;\n    }\n    \/\/ \u53d6\u8865\u7801\uff1a256 - lrc\uff0c\u7b49\u6548\u4e8e (-lrc)\n    return (unsigned char)(-lrc);\n}<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u7528 Python \u9a8c\u8bc1\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>def calc_lrc(data: bytes) -&gt; int:\n    \"\"\"\u8ba1\u7b97 Modbus ASCII LRC \u6821\u9a8c\u7801\"\"\"\n    return (256 - (sum(data) &amp; 0xFF)) &amp; 0xFF\n\n# \u6d4b\u8bd5\nmsg = bytes([0x01, 0x03, 0x21, 0x02, 0x00, 0x02])\nlrc = calc_lrc(msg)\nprint(f\"LRC: 0x{lrc:02X}\")  # \u8f93\u51fa: LRC: 0xD7<\/code><\/pre>\n\n\n<h3 class=\"wp-block-heading\">3.5 LRC \u7684\u5c40\u9650<\/h3>\n\n\n<p class=\"wp-block-paragraph\">LRC \u53ea\u80fd\u68c0\u6d4b\u5230\u4e00\u5b9a\u6bd4\u4f8b\u7684\u9519\u8bef\u3002\u5982\u679c\u4e24\u4e2a\u5b57\u8282\u7684\u540c\u4e00\u4e2a\u6bd4\u7279\u4f4d\u540c\u65f6\u7ffb\u8f6c\uff08\u6bd4\u5982\u5b57\u8282 A \u7684\u7b2c 3 \u4f4d\u4ece 0 \u53d8 1\uff0c\u5b57\u8282 B \u7684\u7b2c 3 \u4f4d\u4ece 1 \u53d8 0\uff09\uff0c\u6c42\u548c\u7ed3\u679c\u4e0d\u53d8\uff0cLRC \u6821\u9a8c\u901a\u8fc7\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48 Modbus RTU \u4f7f\u7528\u66f4\u5f3a\u7684 CRC-16 \u800c\u4e0d\u662f LRC\u2014\u2014RTU \u6a21\u5f0f\u7528\u4e8e\u4e8c\u8fdb\u5236\u6570\u636e\u4f20\u8f93\uff0c\u5bf9\u53ef\u9760\u6027\u8981\u6c42\u66f4\u9ad8\uff0c\u800c ASCII \u6a21\u5f0f\u4e3b\u8981\u7528\u4e8e\u8c03\u8bd5\u548c\u517c\u5bb9\u8001\u8bbe\u5907\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5e27\u5c42\uff08\u4e8c\uff09\uff1aCRC-16 \u6821\u9a8c \u2014\u2014 Modbus RTU \u6a21\u5f0f<\/h2>\n\n\n<h3 class=\"wp-block-heading\">4.1 CRC-16 Modbus \u7684\u6570\u5b66\u5b9a\u4e49<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u4f7f\u7528 CRC-16 \u7b97\u6cd5\uff0c\u53c2\u6570\u5982\u4e0b\uff1a<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u53c2\u6570<\/th><th>\u503c<\/th><\/tr><\/thead><tbody><tr><td>\u5bbd\u5ea6<\/td><td>16 \u4f4d<\/td><\/tr><tr><td>\u751f\u6210\u591a\u9879\u5f0f<\/td><td>0x8005\uff08x\u00b9\u2076 + x\u00b9\u2075 + x\u00b2 + 1\uff09<\/td><\/tr><tr><td>\u5b9e\u9645\u8fd0\u7b97\u591a\u9879\u5f0f<\/td><td>0xA001\uff080x8005 \u4f4d\u53cd\u8f6c\u5f62\u5f0f\uff09<\/td><\/tr><tr><td>\u521d\u59cb\u503c<\/td><td>0xFFFF<\/td><\/tr><tr><td>\u8f93\u5165\u5b57\u8282\u53cd\u5c04<\/td><td>\u5426<\/td><\/tr><tr><td>\u8f93\u51fa CRC \u53cd\u5c04<\/td><td>\u662f\uff08\u6700\u7ec8\u7ed3\u679c\u9ad8\u4f4e\u5b57\u8282\u4ea4\u6362\uff09<\/td><\/tr><tr><td>\u8f93\u51fa\u5f02\u6216\u503c<\/td><td>0x0000<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u7684\u300c\u4f4d\u53cd\u8f6c\u300d\u662f CRC \u53c2\u6570\u4f53\u7cfb\u4e2d\u5f88\u5bb9\u6613\u641e\u6df7\u7684\u6982\u5ff5\u3002Modbus \u7684\u8ba1\u7b97\u5b9e\u9645\u4e0a\u662f\u6309\u4f4d\u5904\u7406\u7684\u3001\u4ece LSB \u65b9\u5411\u79fb\u4f4d\uff0c\u4f7f\u7528\u53cd\u8f6c\u591a\u9879\u5f0f 0xA001\uff0c\u8ba1\u7b97\u7ed3\u679c\u81ea\u7136\u5c31\u662f\u53cd\u8f6c\u7684\u2014\u2014\u6240\u4ee5\u6700\u7ec8\u4e0d\u9700\u8981\u518d\u505a\u4e00\u6b21\u5168\u5c40\u53cd\u8f6c\uff0c\u53ea\u9700\u8981<strong>\u9ad8\u4f4e\u5b57\u8282\u4ea4\u6362<\/strong>\u3002\u53d1\u9001\u65f6\u4f4e\u5b57\u8282\u5728\u524d\uff0c\u9ad8\u5b57\u8282\u5728\u540e\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.2 CRC-16 Modbus \u7b97\u6cd5\u6d41\u7a0b\uff08\u9010\u4f4d\u8ba1\u7b97\u6cd5\uff09<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u9010\u4f4d\u8ba1\u7b97\u867d\u7136\u6162\uff0c\u4f46\u80fd\u8ba9\u4eba\u770b\u6e05\u6bcf\u4e00\u6b65\u53d1\u751f\u4e86\u4ec0\u4e48\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\"><li>\u9884\u7f6e 16 \u4f4d CRC \u5bc4\u5b58\u5668\u4e3a <code>0xFFFF<\/code><\/li><li>\u5c06\u62a5\u6587\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u4e0e CRC \u5bc4\u5b58\u5668\u7684\u4f4e 8 \u4f4d\u5f02\u6216\uff0c\u7ed3\u679c\u5b58\u56de CRC \u5bc4\u5b58\u5668<\/li><li>CRC \u5bc4\u5b58\u5668\u53f3\u79fb 1 \u4f4d\uff0c\u6700\u9ad8\u4f4d\u8865 0\uff0c\u68c0\u67e5\u79fb\u51fa\u7684\u6700\u4f4e\u4f4d<\/li><li>\u79fb\u51fa\u4f4d = 1 \u2192 CRC \u5bc4\u5b58\u5668\u4e0e 0xA001 \u5f02\u6216\uff1b\u79fb\u51fa\u4f4d = 0 \u2192 \u4e0d\u505a\u64cd\u4f5c<\/li><li>\u91cd\u590d\u6b65\u9aa4 3~4\uff0c\u5171 8 \u6b21\uff08\u5904\u7406\u5b8c\u4e00\u4e2a\u5b57\u8282\u7684 8 \u4e2a\u4f4d\uff09<\/li><li>\u91cd\u590d\u6b65\u9aa4 2~5\uff0c\u5904\u7406\u62a5\u6587\u4e2d\u4e0b\u4e00\u4e2a\u5b57\u8282<\/li><li>\u6240\u6709\u5b57\u8282\u5904\u7406\u5b8c\u6210\u540e\uff0cCRC \u5bc4\u5b58\u5668\u7684\u4f4e\u5b57\u8282\u5728\u524d\u3001\u9ad8\u5b57\u8282\u5728\u540e\uff0c\u5373\u4e3a CRC-16 \u6821\u9a8c\u7801<\/li><\/ol>\n\n\n<h3 class=\"wp-block-heading\">4.3 CRC-16 Modbus C \u8bed\u8a00\u5b9e\u73b0<\/h3>\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u8ba1\u7b97 Modbus RTU CRC-16 \u6821\u9a8c\u7801\uff08\u9010\u4f4d\u8ba1\u7b97\u6cd5\uff09\n * buf: \u9700\u8981\u6821\u9a8c\u7684\u6570\u636e\uff08\u4ece\u5730\u5740\u7801\u5230\u6570\u636e\u533a\u7684\u6240\u6709\u5b57\u8282\uff09\n * len: \u5b57\u8282\u6570\n * \u8fd4\u56de\u503c: 16 \u4f4d CRC \u503c\uff08\u4f4e\u5b57\u8282\u5728\u524d\uff09\n *\/\nunsigned short CRC16_Modbus(unsigned char *buf, unsigned short len)\n{\n    unsigned short crc = 0xFFFF;\n    unsigned short i, j;\n\n    for (i = 0; i &lt; len; i++) {\n        crc ^= buf[i];               \/\/ \u6b65\u9aa4 2\n        for (j = 0; j &lt; 8; j++) {    \/\/ \u6b65\u9aa4 3~5 \u5faa\u73af 8 \u6b21\n            if (crc &amp; 0x0001) {\n                crc = (crc &gt;&gt; 1) ^ 0xA001;  \/\/ \u79fb\u51fa\u4f4d\u4e3a 1\n            } else {\n                crc &gt;&gt;= 1;                  \/\/ \u79fb\u51fa\u4f4d\u4e3a 0\n            }\n        }\n    }\n    \/\/ \u6ce8\u610f\uff1aModbus CRC \u53d1\u9001\u65f6\u4f4e\u5b57\u8282\u5728\u524d\n    return crc;\n}<\/code><\/pre>\n\n\n<h3 class=\"wp-block-heading\">4.4 \u67e5\u8868\u6cd5 \u2014\u2014 \u5d4c\u5165\u5f0f\u8bbe\u5907\u4e0a\u7684\u6807\u51c6\u5b9e\u73b0<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u9010\u4f4d\u8ba1\u7b97\u6bcf\u4e2a\u5b57\u8282\u8981\u505a 8 \u6b21\u5faa\u73af\uff0c\u5bf9\u5d4c\u5165\u5f0f MCU \u5f00\u9500\u592a\u5927\u3002\u5de5\u7a0b\u4e0a\u7528\u7684\u662f\u67e5\u8868\u6cd5\uff0c\u9884\u5148\u8ba1\u7b97 256 \u4e2a\u5b57\u8282\u7684 CRC \u503c\uff0c\u6bcf\u5b57\u8282\u53ea\u505a\u4e00\u6b21\u67e5\u8868 + \u4e00\u6b21\u5f02\u6216 + \u4e00\u6b21\u79fb\u4f4d\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u9ad8\u4f4d\u8868\u67e5\u8868\u6cd5<\/strong>\uff08\u6700\u5e38\u7528\uff09\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\/* CRC \u9ad8\u4f4d\u8868 *\/\nstatic const unsigned char auchCRCHi[] = {\n    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,\n    0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,\n    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,\n    \/* ... \u5b8c\u6574 256 \u9879\uff0c\u6b64\u5904\u7701\u7565 *\/\n};\n\n\/* CRC \u4f4e\u4f4d\u8868 *\/\nstatic const unsigned char auchCRCLo[] = {\n    0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06,\n    0x07, 0xC7, 0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD,\n    0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,\n    \/* ... \u5b8c\u6574 256 \u9879\uff0c\u6b64\u5904\u7701\u7565 *\/\n};\n\nunsigned short CRC16_Modbus_Table(unsigned char *buf, unsigned short len)\n{\n    unsigned char crcHi = 0xFF;\n    unsigned char crcLo = 0xFF;\n    unsigned short index;\n\n    while (len--) {\n        index = crcLo ^ *buf++;\n        crcLo = crcHi ^ auchCRCHi[index];\n        crcHi = auchCRCLo[index];\n    }\n    return (crcHi &lt;&lt; 8) | crcLo;\n}<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u5b8c\u6574\u7684\u9ad8\u4f4e\u4f4d\u8868\u5171 512 \u5b57\u8282\uff0c\u53ef\u76f4\u63a5\u4ece Modbus \u534f\u8bae\u89c4\u8303\u9644\u5f55\u4e2d\u6284\u8fc7\u6765\uff0cModbus.org V1.1b3 \u89c4\u8303\u7684\u7b2c 40 \u9875\u7ed9\u51fa\u4e86\u5b8c\u6574\u7684\u793a\u4f8b\u8868\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.5 \u9a8c\u8bc1\u4f60\u7684 CRC \u5b9e\u73b0<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u7528\u5df2\u77e5\u62a5\u6587\u6d4b\u8bd5\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u62a5\u6587: 01 03 00 00 00 01\n\u6b63\u786e\u7684 CRC: 84 0A\uff08\u4f4e\u5b57\u8282\u5728\u524d\uff09\n\n\u9a8c\u8bc1\u6b65\u9aa4:\ncrc = 0xFFFF\ncrc ^= 0x01 \u2192 0xFFFE\n  bit0=0, crc&gt;&gt;1 \u2192 0x7FFF\n  bit1=1, (0x3FFF) ^ 0xA001 \u2192 0x9FFE\n  ...\n\u6700\u7ec8 crc = 0x0A84\n\u53d1\u9001\u65f6\u4f4e\u5b57\u8282\u5728\u524d: 84 0A<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u6574\u4e2a\u62a5\u6587\u53d1\u9001\u5e8f\u5217\uff1a<code>01 03 00 00 00 01 84 0A<\/code><\/p>\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u4e5f\u53ef\u4ee5\u7528 Modbus Poll \u6216 Modbus \u5c0f\u7a0b\u5e8f\u76f4\u63a5\u7b97 CRC\uff0c\u548c\u4f60\u7684\u4ee3\u7801\u5b9e\u73b0\u4ea4\u53c9\u9a8c\u8bc1\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.6 CRC \u7684\u68c0\u9519\u80fd\u529b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">CRC-16 \u53ef\u4ee5\u68c0\u6d4b\u5230\u4ee5\u4e0b\u9519\u8bef\u7c7b\u578b\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\"><li>\u6240\u6709\u5355\u6bd4\u7279\u9519\u8bef<\/li><li>\u6240\u6709\u53cc\u6bd4\u7279\u9519\u8bef\uff08\u5728\u62a5\u6587\u4e0d\u8d85\u8fc7 32767 \u4f4d\u7684\u6761\u4ef6\u4e0b\uff09<\/li><li>\u6240\u6709\u5947\u6570\u4e2a\u6bd4\u7279\u9519\u8bef<\/li><li>\u6240\u6709\u7a81\u53d1\u9519\u8bef\uff0c\u957f\u5ea6 \u2264 16 \u4f4d<\/li><li>99.998% \u7684\u66f4\u957f\u7a81\u53d1\u9519\u8bef<\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\">\u7b80\u5355\u8bf4\uff0c\u5728 Modbus \u5e27\u901a\u5e38\u4e0d\u8d85\u8fc7 256 \u5b57\u8282\u7684\u524d\u63d0\u4e0b\uff0cCRC-16 \u53ef\u4ee5\u6355\u6349\u51e0\u4e4e\u6240\u6709\u7269\u7406\u5c42\u4f20\u8f93\u9519\u8bef\u3002\u7528 CRC \u6821\u9a8c\u901a\u8fc7\u7684\u6570\u636e\u5e27\uff0c\u57fa\u672c\u53ef\u4ee5\u4fe1\u4efb\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u5e94\u7528\u5c42\uff1a\u5f02\u5e38\u54cd\u5e94\u7801<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u7269\u7406\u5c42\u548c\u5e27\u6821\u9a8c\u90fd\u901a\u8fc7\u4e86\uff0c\u4ece\u8bbe\u5907\u6536\u5230\u4e86\u4e00\u4e2a\u5b8c\u6574\u6709\u6548\u7684 Modbus \u5e27\u2014\u2014\u4f46\u903b\u8f91\u4e0a\u662f\u9519\u7684\u3002\u8fd9\u65f6\u5019\u4ece\u8bbe\u5907\u4e0d\u662f\u6c89\u9ed8\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u5f02\u5e38\u54cd\u5e94\uff0c\u544a\u8bc9\u4e3b\u7ad9\u300c\u4f60\u8ba9\u6211\u505a\u7684\u4e8b\u6211\u505a\u4e0d\u4e86\u300d\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.1 \u5f02\u5e38\u54cd\u5e94\u7684\u5e27\u683c\u5f0f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u5e38\u54cd\u5e94\u548c\u5f02\u5e38\u54cd\u5e94\u7684\u533a\u522b\u53ea\u6709\u4e00\u4e2a\uff1a<strong>\u529f\u80fd\u7801\u7684\u6700\u9ad8\u4f4d<\/strong>\u3002<\/p>\n\n\n<ul class=\"wp-block-list\"><li>\u6b63\u5e38\u54cd\u5e94\uff1a\u529f\u80fd\u7801 = \u539f\u59cb\u529f\u80fd\u7801\uff08\u5982 0x03 \u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff09<\/li><li>\u5f02\u5e38\u54cd\u5e94\uff1a\u529f\u80fd\u7801 = \u539f\u59cb\u529f\u80fd\u7801 + 0x80\uff08\u5982 0x83\uff09\uff0c\u7136\u540e\u8ddf\u4e00\u4e2a\u5b57\u8282\u7684\u5f02\u5e38\u7801<\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a\u4e3b\u7ad9\u8bf7\u6c42\u8bfb\u5bc4\u5b58\u5668 <code>01 03 00 00 00 01 84 0A<\/code><\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u5e38\u54cd\u5e94\uff1a<code>01 03 02 00 7B F9 8D<\/code>\uff08\u8bfb\u56de 2 \u5b57\u8282\u6570\u636e <code>00 7B<\/code>\uff09<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5f02\u5e38\u54cd\u5e94\uff08\u5047\u8bbe\u5bc4\u5b58\u5668\u4e0d\u5b58\u5728\uff09\uff1a<code>01 83 02 C0 F1<\/code><\/p>\n\n\n<ul class=\"wp-block-list\"><li><code>83<\/code> = 0x03\uff08\u539f\u529f\u80fd\u7801\uff09+ 0x80<\/li><li><code>02<\/code> = \u5f02\u5e38\u7801\uff0c\u8868\u793a\u300c\u975e\u6cd5\u6570\u636e\u5730\u5740\u300d<\/li><\/ul>\n\n\n<h3 class=\"wp-block-heading\">5.2 \u6807\u51c6\u5f02\u5e38\u7801\u901f\u67e5\u8868<\/h3>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u5f02\u5e38\u7801<\/th><th>\u540d\u79f0<\/th><th>\u542b\u4e49<\/th><th>\u5e38\u89c1\u539f\u56e0<\/th><\/tr><\/thead><tbody><tr><td>0x01<\/td><td>Illegal Function<\/td><td>\u975e\u6cd5\u7684\u529f\u80fd\u7801<\/td><td>\u8bbe\u5907\u4e0d\u652f\u6301\u8be5\u529f\u80fd\u7801\uff08\u5982\u7ed9\u53ea\u8bfb\u8bbe\u5907\u53d1\u5199\u6307\u4ee4\uff09<\/td><\/tr><tr><td>0x02<\/td><td>Illegal Data Address<\/td><td>\u975e\u6cd5\u7684\u6570\u636e\u5730\u5740<\/td><td>\u5bc4\u5b58\u5668\u5730\u5740\u8d85\u51fa\u8303\u56f4\uff0c\u6216\u8d77\u59cb\u5730\u5740+\u6570\u91cf\u8d8a\u754c<\/td><\/tr><tr><td>0x03<\/td><td>Illegal Data Value<\/td><td>\u975e\u6cd5\u7684\u6570\u636e\u503c<\/td><td>\u5199\u5165\u7684\u503c\u8d85\u51fa\u4e86\u5bc4\u5b58\u5668\u7684\u5141\u8bb8\u8303\u56f4<\/td><\/tr><tr><td>0x04<\/td><td>Slave Device Failure<\/td><td>\u4ece\u8bbe\u5907\u6545\u969c<\/td><td>\u4ece\u8bbe\u5907\u5728\u6267\u884c\u64cd\u4f5c\u65f6\u53d1\u751f\u4e86\u4e0d\u53ef\u6062\u590d\u7684\u9519\u8bef<\/td><\/tr><tr><td>0x05<\/td><td>Acknowledge<\/td><td>\u786e\u8ba4\uff08\u6b63\u5728\u5904\u7406\u4e2d\uff09<\/td><td>\u8bf7\u6c42\u5df2\u63a5\u53d7\u4f46\u9700\u8981\u8f83\u957f\u65f6\u95f4\u5904\u7406\uff0c\u4e3b\u7ad9\u5e94\u7b49\u5f85<\/td><\/tr><tr><td>0x06<\/td><td>Slave Device Busy<\/td><td>\u4ece\u8bbe\u5907\u5fd9<\/td><td>\u8bbe\u5907\u6b63\u5728\u5904\u7406\u53e6\u4e00\u4e2a\u547d\u4ee4\uff0c\u6682\u65f6\u65e0\u6cd5\u54cd\u5e94<\/td><\/tr><tr><td>0x07<\/td><td>Negative Acknowledge<\/td><td>\u5426\u5b9a\u786e\u8ba4<\/td><td>\u4ece\u8bbe\u5907\u4e0d\u80fd\u6267\u884c\u8be5\u529f\u80fd\uff08\u901a\u5e38\u662f\u975e\u7279\u5b9a\u9519\u8bef\uff09<\/td><\/tr><tr><td>0x08<\/td><td>Memory Parity Error<\/td><td>\u5185\u5b58\u5947\u5076\u6821\u9a8c\u9519\u8bef<\/td><td>\u6269\u5c55\u6587\u4ef6\u533a\u4e00\u81f4\u6027\u6821\u9a8c\u5931\u8d25<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p class=\"wp-block-paragraph\">0x01 \u5230 0x04 \u662f\u6700\u5bb9\u6613\u9047\u5230\u7684\uff0c0x05 \u5230 0x08 \u5728\u5e38\u89c4 Modbus \u8bbe\u5907\u4e0a\u6bd4\u8f83\u5c11\u89c1\u2014\u2014\u5f88\u591a\u8bbe\u5907\u5382\u5546\u53ea\u5b9e\u73b0\u4e86\u524d 4 \u4e2a\u5f02\u5e38\u7801\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.3 \u5f02\u5e38\u7801\u7684\u5b9e\u9645\u8c03\u8bd5\u7528\u6cd5<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u300c\u4e3a\u4ec0\u4e48\u8bbe\u5907\u4e0d\u56de\u6570\u636e\uff1f\u300d\u6392\u9664\u7269\u7406\u5c42\u548c CRC \u95ee\u9898\u540e\uff0c\u770b\u5f02\u5e38\u7801\uff1a<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6536\u5230 0x01\uff08\u975e\u6cd5\u529f\u80fd\uff09<\/strong>\uff1a\u4f60\u53d1\u4e86\u4e00\u4e2a\u8bbe\u5907\u4e0d\u652f\u6301\u7684\u529f\u80fd\u7801\u3002\u6700\u5e38\u89c1\u7684\u573a\u666f\u662f\u2014\u2014\u4f60\u7528 0x03\uff08\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff09\u53bb\u8bfb\u4e86\u4e00\u4e2a\u53ea\u80fd\u901a\u8fc7 0x04\uff08\u8bfb\u8f93\u5165\u5bc4\u5b58\u5668\uff09\u8bbf\u95ee\u7684\u6a21\u62df\u91cf\u8f93\u5165\u3002\u53bb\u7ffb\u8bbe\u5907\u624b\u518c\u7684\u5bc4\u5b58\u5668\u6620\u5c04\u8868\uff0c\u786e\u8ba4\u8be5\u5730\u5740\u5bf9\u5e94\u7684\u8bbf\u95ee\u529f\u80fd\u7801\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6536\u5230 0x02\uff08\u975e\u6cd5\u5730\u5740\uff09<\/strong>\uff1a\u4f60\u7684\u8d77\u59cb\u5730\u5740\u52a0\u4e0a\u8bf7\u6c42\u6570\u91cf\u8d85\u51fa\u4e86\u8bbe\u5907\u652f\u6301\u7684\u5730\u5740\u8303\u56f4\u3002\u6bd4\u5982\u8bbe\u5907\u53ea\u6709 10 \u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\uff08\u5730\u5740 0-9\uff09\uff0c\u4f60\u8bf7\u6c42\u4e86\u4ece\u5730\u5740 0 \u5f00\u59cb\u7684 12 \u4e2a\u5bc4\u5b58\u5668\u2014\u2014\u8de8\u8fc7\u4e86\u8fb9\u754c\u3002\u89e3\u51b3\u65b9\u6cd5\uff1a\u51cf\u5c0f\u6bcf\u6b21\u8bf7\u6c42\u7684\u5bc4\u5b58\u5668\u6570\u91cf\uff0c\u6216\u8005\u5728\u8bfb\u4e4b\u524d\u5148\u7528 0x11\uff08\u62a5\u544a\u4ece\u7ad9 ID\uff09\u786e\u8ba4\u8bbe\u5907\u7c7b\u578b\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6536\u5230 0x03\uff08\u975e\u6cd5\u6570\u636e\u503c\uff09<\/strong>\uff1a\u4f60\u8981\u5199\u5165\u7684\u503c\u5bf9\u8bbe\u5907\u6ca1\u6709\u610f\u4e49\u3002\u6bd4\u5982\u8bbe\u5907\u652f\u6301 0-100 \u7684\u6570\u636e\u8303\u56f4\uff0c\u4f60\u5199\u5165\u4e86 200\u3002\u6216\u8005\u5199\u5165\u65f6\u7684\u6570\u636e\u5b57\u8282\u6570\u4e0e\u529f\u80fd\u7801\u8981\u6c42\u7684\u957f\u5ea6\u4e0d\u5339\u914d\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5b8c\u5168\u6ca1\u6709\u54cd\u5e94<\/strong>\uff1a\u4e0d\u662f\u5f02\u5e38\u7801\uff0c\u800c\u662f\u4ec0\u4e48\u90fd\u6ca1\u6709\u3002\u53ef\u80fd\u7684\u539f\u56e0\uff1aCRC \u9519\u8bef\uff08\u4ece\u8bbe\u5907\u9759\u9ed8\u4e22\u5f03\uff09\u3001\u5e27\u95f4\u9694\uff083.5 \u4e2a\u5b57\u7b26\u65f6\u95f4\uff09\u6ca1\u6709\u6b63\u786e\u5b9e\u73b0\u3001\u8bbe\u5907\u5730\u5740\u4e0d\u5339\u914d\u3002\u8fd9\u65f6\u5019\u9700\u8981\u7528\u903b\u8f91\u5206\u6790\u4eea\u6293\u603b\u7ebf\uff0c\u786e\u8ba4\u4ece\u8bbe\u5907\u6536\u5230\u4e86\u4ec0\u4e48\u3001UART \u786c\u4ef6\u4e0a\u6709\u6ca1\u6709\u5947\u5076\u6821\u9a8c\u9519\u8bef\u6807\u8bb0\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u8d85\u65f6\u673a\u5236\uff1a\u4e3b\u7ad9\u7684\u6700\u540e\u4e00\u9053\u9632\u7ebf<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Modbus \u89c4\u8303\u8981\u6c42\u4e3b\u7ad9\u914d\u7f6e\u4e00\u4e2a\u8d85\u65f6\u65f6\u95f4\u3002\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\uff0c\u8d85\u65f6\u4f1a\u89e6\u53d1\uff1a<\/p>\n\n\n<ol class=\"wp-block-list\"><li>\u4e3b\u7ad9\u53d1\u51fa\u8bf7\u6c42\u540e\uff0c\u4ece\u7ad9\u5728\u89c4\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u4efb\u4f55\u54cd\u5e94<\/li><li>\u4ece\u7ad9\u68c0\u6d4b\u5230\u5e27\u9519\u8bef\uff08CRC\/LRC \u5931\u8d25\uff09\uff0c\u9759\u9ed8\u4e22\u5f03\u5e27\uff0c\u4e3b\u7ad9\u6536\u4e0d\u5230\u56de\u590d<\/li><li>\u4ece\u7ad9\u5730\u5740\u4e0d\u5b58\u5728\u2014\u2014\u62a5\u6587\u53d1\u5230\u4e86\u7a7a\u5730\u5740\u4e0a<\/li><\/ol>\n\n\n<p class=\"wp-block-paragraph\">\u8d85\u65f6\u65f6\u95f4\u7684\u8bbe\u7f6e\u6709\u4e00\u4e2a\u7ea6\u675f\uff1a<strong>\u5fc5\u987b\u5927\u4e8e\u4ece\u8bbe\u5907\u6700\u957f\u53ef\u80fd\u7684\u54cd\u5e94\u65f6\u95f4<\/strong>\u3002\u8ba1\u7b97\u65b9\u5f0f\u4e3a\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u8d85\u65f6\u65f6\u95f4 &gt; \u4f20\u8f93\u5ef6\u8fdf \u00d7 2 + \u4ece\u7ad9\u5904\u7406\u65f6\u95f4<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u5728 9600bps \u4e0b\uff0c\u4e00\u4e2a\u5178\u578b\u7684 Modbus RTU \u8bf7\u6c42\uff08\u8bfb 1 \u4e2a\u5bc4\u5b58\u5668\uff09\u7ea6 8 \u5b57\u8282 = 64 \u4f4d\uff0c\u4f20\u8f93\u65f6\u95f4 = 64 \/ 9600 \u2248 6.7ms\u3002\u54cd\u5e94\u7ea6 7 \u5b57\u8282 = 56 \u4f4d\uff0c\u4f20\u8f93\u65f6\u95f4 \u2248 5.8ms\u3002\u52a0\u4e0a\u4ece\u7ad9\u5904\u7406\u65f6\u95f4\uff08\u5047\u8bbe\u6700\u6162 50ms\uff09\uff0c\u53cc\u5411\u603b\u65f6\u95f4\u7ea6 6.7 + 50 + 5.8 \u2248 62.5ms\u3002\u7559\u4e00\u500d\u4f59\u91cf\uff0c\u8d85\u65f6\u8bbe 100-200ms \u6bd4\u8f83\u5408\u7406\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u603b\u7ebf\u4e0a\u6709\u591a\u4e2a\u4ece\u7ad9\uff0c\u8981\u628a\u8f6e\u8be2\u6700\u6162\u7684\u8bbe\u5907\uff08\u6bd4\u5982\u6709\u4e9b\u8001 PLC \u5904\u7406\u4e00\u4e2a\u8bf7\u6c42\u8981 100ms\uff09\u8003\u8651\u8fdb\u53bb\u3002Modbus \u89c4\u8303\u5efa\u8bae\u7684\u9ed8\u8ba4\u8d85\u65f6\u662f 1 \u79d2\u2014\u2014\u8fd9\u4e2a\u503c\u5bf9\u4e8e\u73b0\u4ee3\u8bbe\u5907\u504f\u5927\uff0c\u4f46\u4f5c\u4e3a\u521d\u59cb\u503c\u542f\u52a8\u8c03\u8bd5\u662f\u7a33\u59a5\u7684\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u5b8c\u6574\u6392\u969c\u6d41\u7a0b<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4f60\u9762\u5bf9\u300cModbus \u901a\u4fe1\u5931\u8d25\u300d\u65f6\uff0c\u6309\u8fd9\u4e2a\u987a\u5e8f\u9010\u5c42\u6392\u67e5\uff1a<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u5c42<\/th><th>\u68c0\u67e5\u9879<\/th><th>\u5de5\u5177<\/th><th>\u5224\u65ad\u65b9\u6cd5<\/th><\/tr><\/thead><tbody><tr><td>\u7269\u7406\u5c42<\/td><td>RS-485 \u63a5\u7ebf\uff08A\/B\u3001\u5171\u5730\u3001\u7ec8\u7aef\u7535\u963b\uff09<\/td><td>\u4e07\u7528\u8868<\/td><td>\u5bfc\u901a\u3001\u603b\u7ebf\u7a7a\u95f2\u7535\u5e73 \u2265 200mV<\/td><\/tr><tr><td>\u5b57\u7b26\u5c42<\/td><td>\u4e32\u53e3\u53c2\u6570\uff08\u6ce2\u7279\u7387\u3001\u6570\u636e\u4f4d\u3001\u6821\u9a8c\u4f4d\u3001\u505c\u6b62\u4f4d\uff09<\/td><td>\u903b\u8f91\u5206\u6790\u4eea<\/td><td>\u5b9e\u6d4b\u4f4d\u5bbd = 1\/baud<\/td><\/tr><tr><td>\u5b57\u7b26\u5c42<\/td><td>\u5947\u5076\u6821\u9a8c\u9519\u8bef<\/td><td>\u903b\u8f91\u5206\u6790\u4eea \/ \u4e32\u53e3\u52a9\u624b<\/td><td>\u5947\u5076\u9519\u8bef\u8ba1\u6570 = 0<\/td><\/tr><tr><td>\u5e27\u5c42<\/td><td>CRC \u6821\u9a8c<\/td><td>Modbus \u5c0f\u7a0b\u5e8f \/ \u81ea\u5199\u4ee3\u7801<\/td><td>\u63a5\u6536 CRC = \u8ba1\u7b97 CRC<\/td><\/tr><tr><td>\u5e27\u5c42<\/td><td>\u5e27\u95f4\u9694\uff08\u2265 3.5 \u5b57\u7b26\u65f6\u95f4\uff09<\/td><td>\u903b\u8f91\u5206\u6790\u4eea<\/td><td>\u5e27\u95f4\u7a7a\u95f2 \u2265 3.6ms @ 9600bps<\/td><\/tr><tr><td>\u5e94\u7528\u5c42<\/td><td>\u4ece\u7ad9\u5730\u5740<\/td><td>\u8bbe\u5907\u624b\u518c \/ \u62e8\u7801\u5f00\u5173<\/td><td>\u8bf7\u6c42\u5730\u5740 = \u4ece\u7ad9\u5b9e\u9645\u5730\u5740<\/td><\/tr><tr><td>\u5e94\u7528\u5c42<\/td><td>\u529f\u80fd\u7801 + \u5730\u5740\u8303\u56f4<\/td><td>\u8bbe\u5907\u5bc4\u5b58\u5668\u6620\u5c04\u8868<\/td><td>\u529f\u80fd\u7801\u548c\u5bc4\u5b58\u5668\u5730\u5740\u5728\u8bbe\u5907\u652f\u6301\u8303\u56f4\u5185<\/td><\/tr><tr><td>\u5e94\u7528\u5c42<\/td><td>\u5f02\u5e38\u54cd\u5e94\u7801<\/td><td>\u4e32\u53e3\u52a9\u624b \/ \u6293\u5305<\/td><td>\u529f\u80fd\u7801\u6700\u9ad8\u4f4d\u4e3a 1 \u65f6\u68c0\u67e5\u5f02\u5e38\u7801<\/td><\/tr><tr><td>\u5e94\u7528\u5c42<\/td><td>\u8d85\u65f6<\/td><td>\u6293\u5305\u770b\u65f6\u95f4\u6233<\/td><td>\u54cd\u5e94\u65f6\u95f4 &lt; \u8d85\u65f6\u914d\u7f6e<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7279\u522b\u6ce8\u610f<\/strong>\uff1a\u7528 \u300c01 03 00 00 00 01\u300d \u8fd9\u7c7b\u6807\u51c6 Modbus \u8bf7\u6c42\u53bb\u4ea4\u4e92\u65f6\uff0c\u4e0d\u8981\u76f4\u63a5\u7528 ASCII \u5b57\u7b26\u4e32\u53d1\u9001\u2014\u2014\u5fc5\u987b\u53d1\u9001\u4e8c\u8fdb\u5236\u5e27\u3002\u521d\u5b66\u8005\u5728\u4e32\u53e3\u52a9\u624b\u91cc\u7528 ASCII \u6a21\u5f0f\u53d1\u4e86 <code>0x31 0x30 0x33 0x30 0x30 0x30 0x30 0x30 0x30 0x31<\/code>\uff08ASCII \u5b57\u7b26\u4e32\u7684 &#8220;010300000001&#8221;\uff09\uff0c\u800c\u4e0d\u662f <code>01 03 00 00 00 01<\/code> \u8fd9 6 \u4e2a\u5b57\u8282\u3002\u8fd9\u4e2a\u9519\u8bef\u51e0\u4e4e\u6bcf\u4e2a\u5b66 Modbus \u7684\u4eba\u90fd\u72af\u8fc7\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<p class=\"wp-block-paragraph\">CRC \u6821\u9a8c\u7801\u7684\u6b63\u786e\u8ba1\u7b97\u662f Modbus \u901a\u4fe1\u53ef\u9760\u7684\u57fa\u77f3\u3002\u4f46\u5de5\u7a0b\u73b0\u573a\u7684\u95ee\u9898\u4e5d\u6210\u4e0d\u5728 CRC \u672c\u8eab\u2014\u2014\u5728\u63a5\u7ebf\u3001\u5728\u53c2\u6570\u3001\u5728\u5730\u5740\u8303\u56f4\u8d8a\u754c\u3001\u5728\u529f\u80fd\u7801\u9009\u9519\u3002CRC \u66f4\u50cf\u4e00\u4e2a\u5b89\u5168\u7f51\uff0c\u5728\u4f60\u8bf4\u300c\u6570\u636e\u5e94\u8be5\u662f\u5bf9\u7684\u300d\u7684\u65f6\u5019\u7ed9\u4f60\u4fe1\u5fc3\u3002\u5f53\u6570\u636e\u786e\u5b9e\u4e0d\u5bf9\u7684\u65f6\u5019\uff0c\u5148\u67e5\u524d\u9762\u51e0\u5c42\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u628a\u8fd9\u7bc7\u6587\u7ae0\u91cc\u7684\u4ee3\u7801\u653e\u5230\u4f60\u7684\u5de5\u7a0b\u91cc\u4ea4\u53c9\u9a8c\u8bc1\u4e00\u4e0b\uff0c\u522b\u6307\u671b\u7f51\u4e0a\u968f\u4fbf\u6284\u4e00\u6bb5 CRC \u4ee3\u7801\u5c31\u80fd\u76f4\u63a5\u7528\u2014\u2014\u6211\u89c1\u8fc7\u592a\u591a\u56e0\u4e3a\u5b57\u8282\u5e8f\u641e\u53cd\u5bfc\u81f4 CRC \u6c38\u8fdc\u6821\u9a8c\u4e0d\u901a\u8fc7\u7684\u6848\u4f8b\u3002\u6709\u5174\u8da3\u53ef\u4ee5\u7ffb\u4e00\u4e0b Modbus.org V1.1b3 \u89c4\u8303\u7684\u9644\u5f55\u90e8\u5206\uff0c\u90a3\u91cc\u6709 CRC \u67e5\u627e\u8868\u7684\u5b8c\u6574\u6570\u636e\u548c\u9ad8\u4f4e\u4f4d\u4e24\u79cd\u5b9e\u73b0\u65b9\u5f0f\u7684\u5b98\u65b9\u793a\u4f8b\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6709\u95ee\u9898\u518d\u804a\u3002<\/p>\n<span id=\"magicpostMarker\"><\/span>","protected":false},"excerpt":{"rendered":"<p>\u6765\u6e90\uff1aModbus\u4e2d\u6587\u7f51\uff08modbus.cn\uff09 \u2014\u2014 \u56fd\u5185\u9886&#8230;<\/p>","protected":false},"author":1,"featured_media":27977,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[270],"tags":[630,629,632,631,560,623],"class_list":["post-6525","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-modbus-knowledge-base","tag-crc","tag-lrc","tag-unsigned","tag-631","tag-560","tag-623"],"_links":{"self":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/6525","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=6525"}],"version-history":[{"count":0,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/6525\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/media\/27977"}],"wp:attachment":[{"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/media?parent=6525"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/categories?post=6525"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/tags?post=6525"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}