{"id":25693,"date":"2023-10-30T19:45:31","date_gmt":"2023-10-30T11:45:31","guid":{"rendered":"https:\/\/www.modbus.cn\/?p=25693"},"modified":"2026-07-01T08:00:42","modified_gmt":"2026-07-01T00:00:42","slug":"jian-jin-shi-jie-jue-modbus-tong-xin-wen-ti-de-fang-fa","status":"publish","type":"post","link":"https:\/\/www.modbus.cn\/en\/25693.html","title":{"rendered":"\u6e10\u8fdb\u5f0f\u89e3\u51b3Modbus\u901a\u4fe1\u95ee\u9898\u7684\u65b9\u6cd5"},"content":{"rendered":"<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\n<p class=\"wp-block-paragraph\">\u672c\u6587\uff1a\u6e10\u8fdb\u5f0f\u89e3\u51b3Modbus\u901a\u4fe1\u95ee\u9898\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u7684\u5b8c\u6574\u6392\u67e5\u624b\u518c \u00b7 \u4f5c\u8005\uff1amodbus\u6280\u672f\u56e2\u961f \u00b7 \u53d1\u5e03\u4e8e 2026-07-01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6458\u8981\uff1aModbus RS-485 \u901a\u4fe1\u4e0d\u901a\u600e\u4e48\u529e\uff1f\u672c\u6587\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\uff0c\u901a\u8fc7\u771f\u5b9e\u62a5\u6587\u5206\u6790\u548c\u6392\u67e5\u5de5\u5177\u6f14\u793a\uff0c\u7ed9\u51fa\u5b8c\u6574\u7684\u6e10\u8fdb\u5f0f\u6392\u969c\u65b9\u6cd5\u3002\u5173\u952e\u8bcd\uff1aModbus \u901a\u4fe1\u6545\u969c\u6392\u67e5\u3001RS-485 \u6392\u969c\u3001Modbus \u8c03\u8bd5\u65b9\u6cd5\u3001Modbus RTU \u65e0\u54cd\u5e94\u3001CRC \u6821\u9a8c\u9519\u8bef\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5de5\u4e1a\u81ea\u52a8\u5316\u9886\u57df\uff0cModbus \u901a\u4fe1\u51fa\u95ee\u9898\u662f\u6700\u8ba9\u4eba\u5934\u75bc\u7684\u4e8b\u2014\u2014\u4e0d\u662f\u56e0\u4e3a\u5b83\u590d\u6742\uff0c\u800c\u662f\u56e0\u4e3a\u6545\u969c\u70b9\u592a\u5206\u6563\u3002\u7269\u7406\u5c42\u3001\u6570\u636e\u94fe\u8def\u5c42\u3001\u5e94\u7528\u5c42\uff0c\u4efb\u4f55\u4e00\u4e2a\u73af\u8282\u51fa\u95ee\u9898\uff0c\u73b0\u8c61\u53ef\u80fd\u4e00\u6837\uff1a<strong>\u4e3b\u7ad9\u53d1\u8bf7\u6c42\uff0c\u4ece\u7ad9\u4e0d\u56de<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u7bc7\u6587\u7ae0\u4e0d\u662f\u6559\u4f60 Modbus \u534f\u8bae\u57fa\u7840\u3002\u6211\u5047\u8bbe\u4f60\u5df2\u7ecf\u5728\u7528 Modbus\uff0c\u73b0\u5728\u7684\u95ee\u9898\u662f\u300c\u4e0d\u901a\u300d\uff0c\u4f60\u9700\u8981\u4e00\u4efd\u80fd\u7167\u7740\u64cd\u4f5c\u7684\u6392\u969c\u6e05\u5355\u3002\u6211\u4eec\u5c31\u4ece\u6700\u5e95\u5c42\u5f00\u59cb\uff0c\u4e00\u5c42\u4e00\u5c42\u5f80\u4e0a\u67e5\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6838\u5fc3\u5173\u952e\u8bcd\uff1aModbus \u901a\u4fe1\u6545\u969c\u6392\u67e5\u3001RS-485 \u6392\u969c\u3001Modbus RTU \u65e0\u54cd\u5e94\u3001CRC \u6821\u9a8c\u9519\u8bef\u3002\u66f4\u591a Modbus \u6280\u672f\u6587\u7ae0\u8bf7\u8bbf\u95ee modbus.cn\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u5178\u578b\u7684\u73b0\u573a\u6545\u969c\u957f\u4ec0\u4e48\u6837<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u770b\u4e09\u4e2a\u771f\u5b9e\u573a\u666f\uff0c\u5982\u679c\u4f60\u9047\u5230\u8fc7\u7c7b\u4f3c\u7684\uff0c\u8fd9\u7bc7\u6587\u7ae0\u5c31\u662f\u5199\u7ed9\u4f60\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u573a\u666f 1\uff1a\u67d0\u6c61\u6c34\u5904\u7406\u7ad9\uff0c16 \u4e2a Modbus RTU \u4ece\u7ad9\u6302\u5728\u4e00\u6761 RS-485 \u603b\u7ebf\u4e0a\u3002\u6bcf\u5929\u4e0b\u5348\u4e09\u70b9\u51c6\u65f6\u5168\u90e8\u6389\u7ebf\uff0c\u5341\u5206\u949f\u540e\u81ea\u52a8\u6062\u590d\u3002\u67e5\u4e86\u4e09\u4e2a\u661f\u671f\uff0c\u6700\u540e\u53d1\u73b0\u662f\u9694\u58c1\u6cf5\u623f\u7684\u5149\u4f0f\u9006\u53d8\u5668\u6bcf\u5929\u4e0b\u5348\u4e09\u70b9\u542f\u52a8\uff0cEMI \u5e72\u6270\u8026\u5408\u5230 485 \u7ebf\u4e0a\uff0c\u628a\u4fe1\u53f7\u6df9\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u573a\u666f 2\uff1a\u4e00\u53f0\u4e09\u83f1\u53d8\u9891\u5668\u901a\u8fc7 RS-485 \u63a5\u5165\u7f51\u5173\uff0c\u4e3b\u7ad9\u53d1\u529f\u80fd\u7801 03 \u8bfb\u9891\u7387\uff0c\u5076\u5c14\u80fd\u8bfb\u5230\uff0c\u5076\u5c14\u62a5 CRC \u9519\u8bef\u3002\u6ce2\u7279\u7387\u662f 9600\u3002\u6298\u817e\u4e86\u4e24\u5929\u6700\u540e\u53d1\u73b0\u662f A\/B \u7ebf\u63a5\u53cd\u4e86\u2014\u2014\u4e3b\u7ad9\u7684 A \u63a5\u5230\u4e86\u4ece\u7ad9\u7684 B\u3002\u4f46\u4e3a\u4ec0\u4e48\u5076\u5c14\u8fd8\u80fd\u8bfb\u5230\u6570\u636e\uff1f\u56e0\u4e3a RS-485 \u6536\u53d1\u5668\u6709\u4e00\u5b9a\u7684\u5171\u6a21\u5bb9\u9650\uff0c\u5728\u4fe1\u53f7\u8d28\u91cf\u597d\u7684\u65f6\u5019\u771f\u80fd\u901a\uff0c\u4e00\u6709\u5e72\u6270\u5c31 CRC \u62a5\u9519\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u573a\u666f 3\uff1a\u4ea7\u7ebf\u4e0a\u65b0\u52a0\u4e86\u4e00\u53f0\u6e29\u63a7\u5668\uff0c\u5730\u5740\u8bbe\u6210 05\uff0c\u6302\u4e0a\u53bb\u4e4b\u540e 05 \u53f7\u6ca1\u53cd\u5e94\uff0c\u4f46\u539f\u6765\u7684\u4e00\u53f0 07 \u53f7\u4e5f\u4e0d\u901a\u4e86\u3002\u62d4\u6389\u65b0\u8bbe\u5907\uff0c07 \u53f7\u6062\u590d\u6b63\u5e38\u3002\u67e5\u5230\u6700\u540e\uff0c\u65b0\u8bbe\u5907\u9ed8\u8ba4\u914d\u7f6e\u4e86 120\u03a9 \u7ec8\u7aef\u7535\u963b\uff0c\u603b\u7ebf\u4e0a\u4e00\u5171\u6302\u4e86\u4e09\u4e2a\u7ec8\u7aef\u7535\u963b\u2014\u2014\u963b\u6297\u4e0d\u5339\u914d\uff0c\u4fe1\u53f7\u53cd\u5c04\u5bfc\u81f4\u6240\u6709\u4ece\u7ad9\u65f6\u65ad\u65f6\u7eed\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e09\u4e2a\u573a\u666f\u6307\u5411\u540c\u4e00\u4e2a\u9053\u7406\uff1a<strong>Modbus \u4e0d\u901a\uff0c\u4e0d\u80fd\u731c\uff0c\u8981\u4e00\u5c42\u4e00\u5c42\u6392\u9664\u3002<\/strong> \u4e0b\u9762\u5c31\u662f\u8fd9\u4e2a\u6392\u67e5\u7684\u5b8c\u6574\u8def\u5f84\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u6392\u67e5\u7efc\u8ff0\uff1a\u4ece\u7269\u7406\u5c42\u5230\u5e94\u7528\u5c42\u7684\u56db\u5c42\u6a21\u578b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus \u901a\u4fe1\u95ee\u9898\u7684\u6392\u67e5\u8def\u5f84\uff0c\u6309\u5c42\u6b21\u4ece\u4f4e\u5230\u9ad8\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502  \u7b2c\u56db\u5c42\uff1a\u5e94\u7528\u5c42                             \u2502\n\u2502  \u4ece\u7ad9\u5730\u5740\u3001\u5bc4\u5b58\u5668\u6620\u5c04\u3001\u529f\u80fd\u7801\u3001\u5b57\u8282\u5e8f       \u2502\n\u2502  \u73b0\u8c61\uff1a\u4ece\u7ad9\u56de\u5f02\u5e38\u7801\uff0c\u6216\u6570\u636e\u503c\u660e\u663e\u4e0d\u5bf9       \u2502\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n\u2502  \u7b2c\u4e09\u5c42\uff1a\u6570\u636e\u94fe\u8def\u5c42                         \u2502\n\u2502  \u6ce2\u7279\u7387\u3001\u6821\u9a8c\u4f4d\u3001CRC\/LRC \u6821\u9a8c               \u2502\n\u2502  \u73b0\u8c61\uff1aCRC \u9519\u8bef\u3001\u5e27\u4e0d\u5b8c\u6574\u3001\u5076\u53d1\u6027\u4e22\u5e27       \u2502\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n\u2502  \u7b2c\u4e8c\u5c42\uff1a\u7535\u6c14\u5c42                             \u2502\n\u2502  A\/B \u7ebf\u63a5\u6cd5\u3001\u7ec8\u7aef\u7535\u963b\u3001\u504f\u7f6e\u7535\u963b\u3001\u63a5\u5730       \u2502\n\u2502  \u73b0\u8c61\uff1a\u5b8c\u5168\u4e0d\u901a\u3001\u6570\u636e\u5168\u662f\u4e71\u7801\u3001\u95f4\u6b47\u6027\u65ad\u8fde   \u2502\n\u251c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2524\n\u2502  \u7b2c\u4e00\u5c42\uff1a\u7269\u7406\u8fde\u63a5                           \u2502\n\u2502  \u7ebf\u7f06\u901a\u65ad\u3001\u63a5\u5934\u6c27\u5316\u3001\u5c4f\u853d\u5c42\u3001\u5e03\u7ebf\u8def\u5f84       \u2502\n\u2502  \u73b0\u8c61\uff1a\u4e3b\u7ad9\u53d1\u6570\u636e\uff0c\u4ece\u7ad9\u5b8c\u5168\u65e0\u53cd\u5e94           \u2502\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6392\u969c\u94c1\u5f8b\uff1a\u6c38\u8fdc\u4ece\u7b2c\u4e00\u5c42\u5f00\u59cb\u6392\u67e5\uff0c\u786e\u8ba4\u6ca1\u95ee\u9898\u518d\u5f80\u4e0a\u8d70\u3002<\/strong> \u4e0d\u77e5\u9053\u6709\u591a\u5c11\u4eba\u5728\u7b2c\u4e09\u5c42\uff08\u6539\u6ce2\u7279\u7387\u3001\u6539\u8d85\u65f6\u65f6\u95f4\uff09\u4e0a\u6d6a\u8d39\u4e86\u4e09\u5929\uff0c\u6700\u540e\u53d1\u73b0\u662f\u7b2c\u4e00\u5c42\u7684 A\/B \u7ebf\u63a5\u53cd\u4e86\u3002\u5982\u679c\u4f60\u53ea\u8bb0\u4f4f\u4e00\u53e5\u8bdd\uff0c\u8bb0\u4f4f\u8fd9\u53e5\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u7b2c\u4e00\u5c42\uff1a\u7269\u7406\u8fde\u63a5\u68c0\u67e5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">3.1 \u4e07\u7528\u8868\u6253\u7ebf\u2014\u2014\u6700\u57fa\u672c\u7684\u7b2c\u4e00\u6b65<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u628a\u6240\u6709\u8bbe\u5907\u65ad\u7535\u3002\u4e07\u7528\u8868\u8c03\u5230\u7535\u963b\u6863\u6216\u901a\u65ad\u6863\uff0c\u6d4b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; A \u7ebf\u4ece\u4e3b\u7ad9\u5230\u6700\u8fdc\u7aef\u4ece\u7ad9\u662f\u5426\u5bfc\u901a\uff08\u7535\u963b\u5e94 &lt; 10\u03a9\uff0c\u53d6\u51b3\u4e8e\u7ebf\u957f\u548c\u7ebf\u5f84\uff09 &#8211; B \u7ebf\u540c\u6837 &#8211; A \u548c B \u4e4b\u95f4\u4e0d\u80fd\u77ed\u8def\uff08\u7535\u963b\u5e94\u4e3a\u65e0\u7a77\u5927\u6216\u63a5\u8fd1\u65e0\u7a77\u5927\uff09 &#8211; A\/B \u5206\u522b\u5bf9 GND \u4e0d\u80fd\u77ed\u8def<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u901a\u65ad\u90fd\u6b63\u5e38\uff0c\u518d\u628a\u7535\u9001\u4e0a\uff0c\u4e07\u7528\u8868\u8c03\u5230\u76f4\u6d41\u7535\u538b\u6863\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/image.modbus.cn\/wp-content\/uploads\/2023\/10\/20231030194411512.jpg\" ><\/figure>\n\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; A \u5bf9 GND\uff1a\u9759\u6b62\u72b6\u6001\u4e0b\u7ea6 2.5V ~ 3.5V\uff08\u53d6\u51b3\u4e8e\u504f\u7f6e\u7535\u8def\uff09 &#8211; B \u5bf9 GND\uff1a\u9759\u6b62\u72b6\u6001\u4e0b\u7ea6 1.5V ~ 2.5V &#8211; A-B \u5dee\u5206\u7535\u538b\uff1a\u9759\u6b62\u72b6\u6001\u4e0b\u7ea6 0.2V ~ 2V\uff0cA \u5e94\u9ad8\u4e8e B<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5982\u679c A-B \u5dee\u5206\u7535\u538b\u63a5\u8fd1 0V\uff0c\u751a\u81f3 A \u4f4e\u4e8e B\uff0c\u4f60\u7684\u504f\u7f6e\u7535\u8def\u6709\u95ee\u9898\u3002<\/strong> \u5f88\u591a\u5ec9\u4ef7 USB-485 \u8f6c\u6362\u5668\u6ca1\u6709\u5185\u7f6e\u504f\u7f6e\u7535\u963b\uff0c\u6302\u5728\u4e00\u6839\u957f\u603b\u7ebf\u4e0a\u5de5\u4f5c\u65f6\uff0c\u7a7a\u95f2\u72b6\u6001\u4e0b A-B \u5dee\u5206\u4f1a\u6f02\u79fb\u5230\u4e0d\u786e\u5b9a\u72b6\u6001\uff0c\u5bfc\u81f4\u4ece\u7ad9\u7684 UART \u6536\u5230\u968f\u673a\u5783\u573e\u6570\u636e\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.2 A\/B \u7ebf\u5230\u5e95\u600e\u4e48\u63a5\u2014\u2014\u8fd9\u4e2a\u5751\u8e29\u7684\u4eba\u6700\u591a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u7684 A\/B \u63a5\u7ebf\u6ca1\u6709\u7edf\u4e00\u7684\u884c\u4e1a\u6807\u7b7e\u6807\u51c6\u3002\u4e0d\u540c\u8bbe\u5907\u5382\u5546\u5bf9 A \u548c B \u7684\u5b9a\u4e49\u53ef\u80fd\u662f\u53cd\u7684\u3002\u4ee5\u4e0b\u662f\u4f60\u53ef\u80fd\u4f1a\u9047\u5230\u7684\u6807\u8bb0\u65b9\u5f0f\u548c\u5b83\u4eec\u7684\u5bf9\u5e94\u5173\u7cfb\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u5e38\u89c1\u6807\u8bb0<\/th><th>\u53e6\u4e00\u79cd\u6807\u8bb0<\/th><th>\u7a7a\u95f2\u7535\u538b<\/th><th>\u8bf4\u660e<\/th><\/tr><\/thead>\n<tbody><tr><td>A \/ + \/ D+ \/ TX+ \/ \u6b63<\/td><td>Non-Inverting<\/td><td>\u9ad8\u4e8e B<\/td><td>\u540c\u76f8\u7aef<\/td><\/tr>\n<tr><td>B \/ &#8211; \/ D- \/ TX- \/ \u8d1f<\/td><td>Inverting<\/td><td>\u4f4e\u4e8e A<\/td><td>\u53cd\u76f8\u7aef<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5feb\u901f\u5224\u5b9a\u65b9\u6cd5\uff1a\u65ad\u7535\u72b6\u6001\u4e0b\u7528\u4e07\u7528\u8868\u4e8c\u6781\u7ba1\u6863\u6d4b\u3002<\/strong> \u7ea2\u8868\u7b14\u63a5 GND\uff0c\u9ed1\u8868\u7b14\u63a5 A\u2014\u2014\u5927\u591a\u6570 RS-485 \u6536\u53d1\u5668\u82af\u7247\uff08\u5982 MAX485\u3001SN75176\uff09\u7684 A \u811a\u5bf9 GND \u6709\u4e00\u4e2a\u53cd\u5411\u4fdd\u62a4\u4e8c\u6781\u7ba1\uff0c\u4f1a\u6d4b\u51fa\u6b63\u5411\u538b\u964d\u7ea6 0.6V\u3002B \u811a\u5bf9 GND \u4e5f\u4e00\u6837\u3002\u5982\u679c\u6d4b\u4e0d\u51fa\u6765\uff0c\u6362\u4e2a\u6781\u6027\u518d\u6d4b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd8\u6709\u4e00\u4e2a\u66f4\u66b4\u529b\u7684\u65b9\u6cd5\uff1a\u5982\u679c\u63a5\u4e86\u4e0d\u901a\uff0c\u628a A \u548c B \u4ea4\u6362\u4e00\u4e0b\u8bd5\u8bd5\u3002\u4e0d\u662f\u7b11\u8bdd\u2014\u2014\u8fd9\u5728\u73b0\u573a\u662f\u6700\u5e38\u7528\u7684\u300c\u6392\u969c\u624b\u6bb5\u300d\u3002\u56e0\u4e3a\u5f88\u591a\u53d8\u9891\u5668\u7684 RS-485 \u7aef\u5b50\u6807\u6ce8\u5c31\u662f\u53cd\u7684\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/image.modbus.cn\/wp-content\/uploads\/2023\/10\/20231030194450899.jpg\" ><\/figure>\n\n\n\n\n<h3 class=\"wp-block-heading\">3.3 \u7ec8\u7aef\u7535\u963b\u2014\u2014\u4ec0\u4e48\u65f6\u5019\u63a5\u3001\u63a5\u5728\u54ea<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ec8\u7aef\u7535\u963b 120\u03a9\uff0c\u63a5\u5728\u603b\u7ebf\u7684\u6700\u4e24\u7aef\u3002\u8fd9\u53e5\u8bdd\u6bcf\u4e2a\u4eba\u90fd\u542c\u8fc7\u3002\u4f46\u5b9e\u9645\u5de5\u7a0b\u4e2d\u8fd9\u4e9b\u7ec6\u8282\u624d\u51b3\u5b9a\u6210\u8d25\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4ec0\u4e48\u65f6\u5019\u5fc5\u987b\u63a5\u3002<\/strong> \u603b\u7ebf\u957f\u5ea6\u8d85\u8fc7 50 \u7c73\uff0c\u6216\u6ce2\u7279\u7387 \u2265 19200\u3002\u5224\u65ad\u6807\u51c6\u4e0d\u662f\u957f\u5ea6\uff0c\u662f\u4f60\u7528\u793a\u6ce2\u5668\u770b\u4fe1\u53f7\u6ce2\u5f62\u2014\u2014\u5982\u679c\u6709\u660e\u663e\u7684\u8fc7\u51b2\u6216\u53cd\u5c04\u53f0\u9636\uff0c\u52a0\u7ec8\u7aef\u7535\u963b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4ec0\u4e48\u65f6\u5019\u53ef\u4ee5\u4e0d\u63a5\u3002<\/strong> \u6d4b\u8bd5\u53f0\u4e0a\uff0c\u4e00\u7c73\u77ed\u7ebf\uff0c\u6ce2\u7279\u7387 9600\u3002\u8fd9\u65f6\u5019\u52a0\u7ec8\u7aef\u7535\u963b\u53cd\u800c\u53ef\u80fd\u56e0\u4e3a\u9a71\u52a8\u80fd\u529b\u4e0d\u8db3\u5bfc\u81f4\u4fe1\u53f7\u5e45\u503c\u4e0b\u964d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e00\u4e2a\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u5751\u3002<\/strong> \u5f88\u591a RS-485 \u8bbe\u5907\u5185\u90e8\u5df2\u7ecf\u96c6\u6210\u4e86\u7ec8\u7aef\u7535\u963b\uff0c\u901a\u8fc7\u8df3\u7ebf\u6216\u62e8\u7801\u5f00\u5173\u542f\u7528\u3002\u5982\u679c\u4f60\u4e0d\u77e5\u9053\u8fd9\u4e00\u70b9\uff0c\u5728\u603b\u7ebf\u4e0a\u624b\u52a8\u52a0\u4e86 120\u03a9\uff0c\u800c\u8bbe\u5907\u4e0a\u4e5f\u5f00\u7740 120\u03a9\uff0c\u7b49\u4e8e\u5e76\u8054\u6210\u4e86 60\u03a9\u2014\u2014\u4fe1\u53f7\u5e45\u5ea6\u5927\u5e45\u4e0b\u964d\uff0c\u53cd\u800c\u66f4\u4e0d\u901a\u4e86\u3002\u8fd9\u5c31\u662f\u524d\u9762\u7684\u573a\u666f 3\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6392\u67e5\u65b9\u6cd5\uff1a\u6240\u6709\u8bbe\u5907\u65ad\u7535\uff0c\u4e07\u7528\u8868\u7535\u963b\u6863\u6d4b A-B \u4e4b\u95f4\u7684\u76f4\u6d41\u7535\u963b\u3002\u6b63\u5e38\u5e94\u8be5\u662f\u51e0 k\u03a9 \u5230\u51e0\u5341 k\u03a9\uff08\u504f\u7f6e\u7535\u963b\u51b3\u5b9a\uff09\u3002\u5982\u679c\u6d4b\u51fa\u6765\u662f 60\u03a9 \u6216 120\u03a9\uff0c\u8bf4\u660e\u81f3\u5c11\u6709\u4e00\u4e2a\u7ec8\u7aef\u7535\u963b\u5728\u8d77\u4f5c\u7528\u3002\u9010\u4e2a\u62d4\u8bbe\u5907\uff0c\u770b\u54ea\u4e2a\u8bbe\u5907\u62d4\u6389\u540e\u963b\u6297\u53d8\u4e86\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3.4 \u5c4f\u853d\u548c\u63a5\u5730\u2014\u2014\u5927\u90e8\u5206\u4eba\u505a\u9519\u7684\u5730\u65b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u5c4f\u853d\u5c42\u5e94\u8be5<strong>\u5355\u7aef\u63a5\u5730<\/strong>\uff0c\u5728\u4e3b\u7ad9\u6216\u7f51\u5173\u4fa7\u63a5\u5927\u5730\u3002\u5982\u679c\u4e24\u7aef\u90fd\u63a5\u5730\uff0c\u5730\u7535\u4f4d\u5dee\u4f1a\u5728\u5c4f\u853d\u5c42\u4e0a\u5f62\u6210\u73af\u6d41\uff0c\u53cd\u800c\u628a\u5e72\u6270\u5f15\u5165\u4fe1\u53f7\u7ebf\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e6\u5916\uff0c\u4e0d\u8981\u7528\u7f51\u7ebf\u7684\u7a7a\u95f2\u7ebf\u5bf9\u505a RS-485\u3002\u7f51\u7ebf\u662f 100\u03a9 \u7279\u6027\u963b\u6297\uff0cRS-485 \u7535\u7f06\u662f 120\u03a9 \u7279\u6027\u963b\u6297\uff0c\u4e0d\u5339\u914d\u4f1a\u5bfc\u81f4\u9ad8\u901f\u7387\u4e0b\u4fe1\u53f7\u53cd\u5c04\u4e25\u91cd\u3002\u77ed\u8ddd\u79bb\uff08&lt; 10 \u7c73\uff09\u51d1\u5408\u80fd\u7528\uff0c\u4f46\u4e0d\u8981\u4f5c\u4e3a\u6b63\u5f0f\u5de5\u7a0b\u65b9\u6848\u3002\u6b63\u89c4\u7684 RS-485 \u7535\u7f06\u662f\u4e00\u5bf9\u53cc\u7ede\u7ebf\u52a0\u5c4f\u853d\u5c42\uff0c\u7279\u6027\u963b\u6297 120\u03a9\uff0c\u6bd4\u5982 Belden 3105A \u6216\u7b49\u6548\u578b\u53f7\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u7b2c\u4e8c\u5c42\uff1a\u7535\u6c14\u5c42\u68c0\u67e5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7269\u7406\u8fde\u63a5\u786e\u8ba4\u6ca1\u95ee\u9898\u4e4b\u540e\uff0c\u5982\u679c\u8fd8\u662f\u4e0d\u901a\u6216\u6709\u8bef\u7801\uff0c\u8fdb\u5165\u7535\u6c14\u5c42\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 \u7528\u793a\u6ce2\u5668\u770b\u6ce2\u5f62<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u793a\u6ce2\u5668\u63a2\u5934\u6302\u5728 A \u7ebf\u5bf9 GND \u548c B \u7ebf\u5bf9 GND\uff0c\u89c2\u5bdf\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; \u7a7a\u95f2\u72b6\u6001\u4e0b A \u548c B \u7684\u7535\u538b\u503c\u662f\u5426\u7a33\u5b9a\uff08A \u5e94\u9ad8\u4e8e B \u81f3\u5c11 200mV\uff09 &#8211; \u6709\u6570\u636e\u4f20\u8f93\u65f6\uff0cA \u548c B \u662f\u5426\u5448\u73b0\u6807\u51c6\u7684\u5dee\u5206\u4fe1\u53f7\uff08A \u548c B \u955c\u50cf\u5bf9\u79f0\uff09 &#8211; \u6ce2\u5f62\u4e0a\u5347\u6cbf\u548c\u4e0b\u964d\u6cbf\u662f\u5426\u5e72\u51c0\uff08\u4e0d\u5e94\u8be5\u6709\u660e\u663e\u7684\u53f0\u9636\u6216\u5706\u5f27\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u6ce2\u5f62\u8fb9\u7f18\u5f88\u5706\uff0c\u53ef\u80fd\u662f\u7ebf\u7f06\u7535\u5bb9\u592a\u5927\uff08\u7ebf\u592a\u957f\u6216\u7ebf\u5f84\u592a\u7ec6\uff09\uff0c\u6216\u8005\u9a71\u52a8\u80fd\u529b\u4e0d\u8db3\u3002\u964d\u4f4e\u6ce2\u7279\u7387\u901a\u5e38\u80fd\u7f13\u89e3\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4.2 \u504f\u7f6e\u7535\u963b\uff08Fail-Safe \u504f\u7f6e\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u6807\u51c6\u8981\u6c42\u5dee\u5206\u8f93\u5165\u7535\u538b \u2265 200mV \u65f6\u5224\u5b9a\u4e3a\u903b\u8f91 1\uff0c\u2264 -200mV \u65f6\u5224\u5b9a\u4e3a\u903b\u8f91 0\u3002\u4f46\u5728\u603b\u7ebf\u7a7a\u95f2\uff08\u6240\u6709\u8bbe\u5907\u90fd\u4e0d\u9a71\u52a8\uff09\u65f6\uff0c\u5dee\u5206\u7535\u538b\u53ef\u80fd\u843d\u5728 -200mV \u5230 +200mV \u7684\u4e0d\u786e\u5b9a\u533a\u95f4\u5185\uff0c\u5bfc\u81f4\u63a5\u6536\u5668\u8f93\u51fa\u968f\u673a\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u9700\u8981\u504f\u7f6e\u7535\u963b\uff1a\u5728\u603b\u7ebf\u7684\u67d0\u4e00\u4e2a\u4f4d\u7f6e\uff08\u901a\u5e38\u5728\u4e3b\u7ad9\u6216\u504f\u7f6e\u7535\u8def\u6240\u5728\u5904\uff09\u7528\u4e24\u4e2a\u7535\u963b\u628a A \u4e0a\u62c9\u5230 VCC\u3001B \u4e0b\u62c9\u5230 GND\uff0c\u4fdd\u8bc1\u7a7a\u95f2\u72b6\u6001\u4e0b A &gt; B \u4e14\u5dee\u503c &gt; 200mV\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e38\u89c1\u7684\u504f\u7f6e\u7535\u963b\u53d6\u503c\u662f 680\u03a9 \u6216 560\u03a9\uff08\u4e0a\u62c9\u548c\u4e0b\u62c9\u5404\u4e00\u4e2a\uff09\u3002\u4f46\u8981\u6ce8\u610f\uff1a\u504f\u7f6e\u7535\u963b\u548c\u7ec8\u7aef\u7535\u963b\u662f\u5e76\u8054\u5173\u7cfb\u3002\u5982\u679c\u4f60\u7684\u7ec8\u7aef\u7535\u963b\u662f 120\u03a9\uff0c\u504f\u7f6e\u7535\u963b\u5404 680\u03a9\uff0c\u5b9e\u9645\u7684\u7a7a\u95f2\u5dee\u5206\u7535\u538b\u662f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>V_diff = VCC \u00d7 R_term \/ (R_term + R_pullup + R_pulldown)\n       = 5V \u00d7 120 \/ (120 + 680 + 680) \u2248 0.405V = 405mV<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u503c &gt; 200mV\uff0c\u6ee1\u8db3\u8981\u6c42\u3002\u4f46\u5982\u679c\u4f60\u628a\u7ec8\u7aef\u7535\u963b\u6362\u6210\u4e86 60\u03a9\uff08\u4e24\u4e2a 120\u03a9 \u5e76\u8054\uff09\uff0c\u5dee\u5206\u7535\u538b\u5c31\u53ea\u5269\u7ea6 210mV\uff0c\u5361\u5728\u4e34\u754c\u70b9\u4e0a\u3002\u6240\u4ee5\u7ec8\u7aef\u7535\u963b\u7684\u6570\u91cf\u548c\u4f4d\u7f6e\u662f\u89c4\u5212\u504f\u7f6e\u7535\u963b\u7684\u524d\u63d0\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u7b2c\u4e09\u5c42\uff1a\u6570\u636e\u94fe\u8def\u5c42\u68c0\u67e5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7535\u6c14\u5c42\u6ca1\u95ee\u9898\uff0c\u4f46\u901a\u4fe1\u8fd8\u662f\u4e0d\u5bf9\u2014\u2014\u8fdb\u5165\u534f\u8bae\u672c\u8eab\u7684\u6392\u969c\u3002\u8fd9\u4e00\u5c42\u9700\u8981\u4e32\u53e3\u6293\u5305\u5de5\u5177\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.1 \u786e\u8ba4\u4ece\u7ad9\u662f\u5426\u652f\u6301 Modbus<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u91cc\u4e0d\u662f\u8ba9\u4f60\u770b\u8bbe\u5907\u8bf4\u660e\u4e66\u2014\u2014\u8bf4\u660e\u4e66\u5199\u4e86\u652f\u6301\u4e0d\u4ee3\u8868\u56fa\u4ef6\u771f\u7684\u5f00\u4e86\u3002\u7528\u4e32\u53e3\u52a9\u624b\u53d1\u4e00\u6761\u6700\u7b80\u5355\u7684\u8bf7\u6c42\u5e27\uff0c\u770b\u4ece\u7ad9\u56de\u4e0d\u56de\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5 Modbus RTU \u4e3a\u4f8b\uff0c\u53d1\u529f\u80fd\u7801 03\uff08\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u4ece\u7ad9\u5730\u5740: 01\n\u529f\u80fd\u7801:   03\n\u8d77\u59cb\u5730\u5740: 00 00\uff08\u5bc4\u5b58\u5668 40001\uff09\n\u5bc4\u5b58\u5668\u6570: 00 01\uff08\u8bfb 1 \u4e2a\uff09\nCRC:      84 0A\n\n\u5b8c\u6574\u5e27:   01 03 00 00 00 01 84 0A<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u628a\u4f60\u7684 USB-485 \u8f6c\u6362\u5668\u63a5\u5230\u4ece\u7ad9\u7684 RS-485 \u53e3\u4e0a\uff0c\u4e32\u53e3\u52a9\u624b\u8bbe\u597d\u6ce2\u7279\u7387\/\u6570\u636e\u4f4d\/\u6821\u9a8c\u4f4d\/\u505c\u6b62\u4f4d\uff0c\u53d1\u4e0a\u9762\u8fd9\u5e27\u3002\u5982\u679c\u4ece\u7ad9\u56de\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>01 03 02 00 2A 39 9B<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bf4\u660e\u4ece\u7ad9\u652f\u6301 Modbus\uff0c\u5bc4\u5b58\u5668 40001 \u91cc\u7684\u503c\u662f 0x002A\uff08\u5341\u8fdb\u5236 42\uff09\u3002\u5982\u679c\u6ca1\u6709\u4efb\u4f55\u54cd\u5e94\uff0c\u7ee7\u7eed\u67e5\u4e0b\u9762\u51e0\u9879\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.2 \u6ce2\u7279\u7387\u548c\u5e27\u683c\u5f0f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u7684\u9ed8\u8ba4\u5e27\u683c\u5f0f\u901a\u5e38\u662f\uff1a9600-8-N-1\uff08\u6ce2\u7279\u7387 9600\uff0c8 \u6570\u636e\u4f4d\uff0c\u65e0\u6821\u9a8c\uff0c1 \u505c\u6b62\u4f4d\uff09\u3002\u4f46\u5f88\u591a\u8001\u8bbe\u5907\u7528 9600-8-E-1\uff08\u5076\u6821\u9a8c\uff09\u6216 19200-8-N-1\u3002\u8fd8\u6709\u4e00\u4e9b\u56fd\u4ea7\u8bbe\u5907\u9ed8\u8ba4 4800\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u7684 USB-485 \u8f6c\u6362\u5668\u6ce2\u7279\u7387\u8bbe\u5bf9\u4e86\uff0c\u4ece\u7ad9\u4f1a\u56de\u5e94\u3002\u5982\u679c\u6ce2\u7279\u7387\u4e0d\u5bf9\uff0c\u4ece\u7ad9\u4f1a\u6536\u5230\u4e71\u7801\u3002\u4ece\u7ad9\u770b\u5230\u4e71\u7801\u540e\u7684\u884c\u4e3a\u53d6\u51b3\u4e8e\u5176\u56fa\u4ef6\u5b9e\u73b0\u2014\u2014\u6709\u7684\u8bbe\u5907\u76f4\u63a5\u4e22\u5f03\uff0c\u6709\u7684\u8bbe\u5907\u4f1a\u5c1d\u8bd5\u89e3\u6790\u5931\u8d25\u540e\u590d\u4f4d\u63a5\u6536\u7f13\u51b2\u533a\uff0c\u8868\u73b0\u4e3a\u5b8c\u5168\u6c89\u9ed8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e0d\u8981\u731c\u6ce2\u7279\u7387\u3002<\/strong> \u5982\u679c\u624b\u5934\u6ca1\u6709\u8bbe\u5907\u624b\u518c\uff0c\u7528\u4e00\u4e2a\u7b28\u529e\u6cd5\uff1aUSB \u903b\u8f91\u5206\u6790\u4eea\uff08\u51e0\u5341\u5757\u94b1\u7684\u90a3\u79cd\u5c31\u884c\uff09\u6302\u5728 A\u3001B \u7ebf\u4e0a\uff0c\u770b\u4ece\u7ad9\u4e0a\u7535\u540e\u6709\u6ca1\u6709\u53d1\u6570\u636e\u3002\u6709\u4e9b\u4ece\u7ad9\u542f\u52a8\u540e\u4f1a\u4e3b\u52a8\u53d1\u4e00\u6bb5\u6807\u8bc6\u4fe1\u606f\uff0c\u6d4b\u91cf\u8fd9\u6bb5\u6570\u636e\u7684\u4f4d\u5bbd\u5c31\u80fd\u53cd\u63a8\u6ce2\u7279\u7387\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.3 \u6821\u9a8c\u4f4d\u3001\u505c\u6b62\u4f4d\u3001\u6570\u636e\u4f4d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">9600-8-N-1 vs 9600-8-E-1 \u7684\u533a\u522b\u4e0d\u4ec5\u662f\u4e00\u4e2a\u6821\u9a8c\u4f4d\u3002\u5e27\u603b\u957f\u5ea6\u53d8\u4e86\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; 8-N-1\uff1a1 \u8d77\u59cb\u4f4d + 8 \u6570\u636e\u4f4d + 1 \u505c\u6b62\u4f4d = 10 \u4f4d\/\u5b57\u8282 &#8211; 8-E-1\uff1a1 \u8d77\u59cb\u4f4d + 8 \u6570\u636e\u4f4d + 1 \u6821\u9a8c\u4f4d + 1 \u505c\u6b62\u4f4d = 11 \u4f4d\/\u5b57\u8282<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u7528 8-N-1 \u53d1\uff0c\u4ece\u7ad9\u7528 8-E-1 \u6536\uff0c\u4ece\u7ad9\u4f1a\u628a\u4f60\u7684\u505c\u6b62\u4f4d\u5f53\u6821\u9a8c\u4f4d\u6765\u9a8c\u8bc1\u3002\u53cd\u4e4b\u4ea6\u7136\u3002\u8fd9\u4f1a\u5bfc\u81f4\u5076\u53d1\u6027\u7684\u6821\u9a8c\u9519\u8bef\u800c\u975e\u5168\u90e8\u9519\u8bef\u2014\u2014\u56e0\u4e3a\u505c\u6b62\u4f4d\u662f\u56fa\u5b9a\u7684\u903b\u8f91 1\uff0c\u6709 50% \u7684\u6982\u7387\u78b0\u5de7\u300c\u6821\u9a8c\u901a\u8fc7\u300d\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6ce2\u7279\u7387\u3001\u6821\u9a8c\u4f4d\u3001\u505c\u6b62\u4f4d\u7684\u6392\u5217\u7ec4\u5408\u8981\u4ece\u8bbe\u5907\u624b\u518c\u91cc\u786e\u8ba4\uff0c\u800c\u4e0d\u662f\u51d1\u51fa\u6765\u3002<\/strong> 16 \u4e2a\u4ece\u7ad9\uff0c7 \u79cd\u6ce2\u7279\u7387 \u00d7 3 \u79cd\u6821\u9a8c \u00d7 2 \u79cd\u505c\u6b62\u4f4d = 42 \u79cd\u7ec4\u5408\u3002\u51d1\u51fa\u6765\u7eaf\u7cb9\u662f\u6298\u78e8\u81ea\u5df1\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.4 \u6293\u5305\u5206\u6790\u2014\u2014\u533a\u5206\u300c\u6ca1\u53d1\u51fa\u53bb\u300d\u300c\u6ca1\u56de\u5e94\u300d\u300c\u56de\u4e86\u9519\u8bef\u300d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7528\u4e32\u53e3\u76d1\u63a7\u8f6f\u4ef6\uff08\u6bd4\u5982 Device Monitoring Studio\u3001Serial Port Monitor\uff0c\u6216\u8005\u7b80\u5355\u7c97\u66b4\u5730\u7528\u4e24\u4e2a USB-485 \u8f6c\u6362\u5668\u80cc\u9760\u80cc\u63a5\u5728\u603b\u7ebf\u4e0a\uff09\u6293\u5b9e\u9645\u7684\u6536\u53d1\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u770b\u4e09\u4e2a\u5173\u952e\u6307\u6807\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e3b\u7ad9\u53d1\u51fa\u7684\u5e27\u662f\u5426\u6b63\u786e\u3002<\/strong> \u7528 CRC \u8ba1\u7b97\u5668\u9a8c\u8bc1\u4f60\u53d1\u51fa\u7684\u5e27\u91cc\u7684 CRC \u5bf9\u4e0d\u5bf9\u3002\u4e00\u4e2a\u5e38\u89c1\u9519\u8bef\u662f CRC \u9ad8\u4f4e\u5b57\u8282\u53cd\u4e86\u2014\u2014Modbus RTU \u89c4\u5b9a CRC \u4f4e\u5b57\u8282\u5728\u524d\uff0c\u9ad8\u5b57\u8282\u5728\u540e\u3002\u6bd4\u5982\u5e27 <code>01 03 00 00 00 01<\/code> \u7684 CRC \u662f 0x840A\uff0c\u5e27\u91cc\u5e94\u8be5\u662f <code>84 0A<\/code> \u800c\u4e0d\u662f <code>0A 84<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4ece\u7ad9\u6709\u6ca1\u6709\u54cd\u5e94\u3002<\/strong> \u5982\u679c\u4e3b\u7ad9\u5e27\u6b63\u786e\u53d1\u51fa\u4f46\u5728\u5408\u7406\u7684\u65f6\u95f4\u5185\uff08\u6bd4\u5982 200ms\uff09\u6ca1\u6709\u4efb\u4f55\u6570\u636e\u56de\u6765\uff0c\u68c0\u67e5\u4ece\u7ad9\u5730\u5740\u662f\u5426\u5339\u914d\u3001\u603b\u7ebf\u4e0a\u662f\u5426\u53ea\u6709\u4e00\u53f0\u8bbe\u5907\u5728\u7ebf\uff08\u52a0\u53e6\u4e00\u53f0\u540e\u53ef\u80fd\u5730\u5740\u51b2\u7a81\uff09\u3001\u4ece\u7ad9\u662f\u5426\u5904\u4e8e\u300c\u76d1\u542c\u300d\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4ece\u7ad9\u54cd\u5e94\u4e86\u4ec0\u4e48\u3002<\/strong> \u5982\u679c\u4ece\u7ad9\u56de\u4e86\u5f02\u5e38\u5e27\uff0c\u529f\u80fd\u7801\u6700\u9ad8\u4f4d\u7f6e 1 \u518d\u52a0\u5f02\u5e38\u7801\uff08\u6bd4\u5982 <code>01 83 02 C0 F1<\/code>\uff0c83 = 03 + 0x80\uff0c\u5f02\u5e38\u7801 02 = \u975e\u6cd5\u6570\u636e\u5730\u5740\uff09\uff0c\u90a3\u81f3\u5c11\u94fe\u8def\u5c42\u662f\u901a\u7684\uff0c\u95ee\u9898\u5728\u5e94\u7528\u5c42\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5.5 CRC \u6821\u9a8c\u9519\u8bef\u7684\u7cbe\u51c6\u6392\u67e5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CRC \u6821\u9a8c\u9519\u8bef\u662f\u6700\u5e38\u89c1\u7684\u94fe\u8def\u5c42\u95ee\u9898\uff0c\u53ef\u80fd\u7684\u539f\u56e0\u6709\u8fd9\u4e9b\uff0c\u6309\u9891\u7387\u4ece\u9ad8\u5230\u4f4e\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. <strong>A\/B \u7ebf\u63a5\u53cd\u3002<\/strong> \u5dee\u5206\u6781\u6027\u53cd\u4e86\uff0c\u6240\u6709\u6570\u636e\u4f4d\u53cd\u8f6c\uff0cCRC \u5927\u6982\u7387\u4e0d\u5bf9\u3002\u4f46\u6709\u5171\u6a21\u5bb9\u9650\u65f6\u5076\u5c14\u80fd\u5bf9\u2014\u2014\u8fd9\u5c31\u662f\u573a\u666f 2\u3002 2. <strong>\u6ce2\u7279\u7387\u504f\u5dee\u3002<\/strong> \u4e24\u4e2a\u8bbe\u5907\u7684\u65f6\u949f\u504f\u5dee\u5bfc\u81f4\u91c7\u6837\u70b9\u6f02\u79fb\u3002\u5982\u679c\u6ce2\u7279\u7387\u504f\u5dee\u8d85\u8fc7 \u00b12%\uff0c\u63a5\u6536\u7aef UART \u4f1a\u91c7\u6837\u5230\u9519\u8bef\u7684\u4f4d\u503c\u3002\u7279\u522b\u662f\u5728\u9ad8\u6e29\u73af\u5883\u4e0b\uff0cMCU \u5185\u90e8 RC \u632f\u8361\u5668\u7684\u6e29\u6f02\u53ef\u80fd\u8fbe\u5230 \u00b15%\u3002 3. <strong>\u63a5\u7ebf\u677e\u52a8\u6216\u63a5\u89e6\u4e0d\u826f\u3002<\/strong> \u4e00\u4e2a\u4f4d\u7684\u4e22\u5931\u4f1a\u5bfc\u81f4\u540e\u7eed\u6240\u6709\u5b57\u8282\u79fb\u4f4d\uff0cCRC \u5fc5\u9519\u3002 4. <strong>\u7535\u78c1\u5e72\u6270\u3002<\/strong> \u53d8\u9891\u5668\u542f\u52a8\u77ac\u95f4\u3001\u7535\u710a\u673a\u5de5\u4f5c\u65f6\u7684\u5f3a EMI \u4f1a\u76f4\u63a5\u6539\u53d8\u4f20\u8f93\u7ebf\u4e0a\u7684\u7535\u5e73\uff0c\u5bfc\u81f4\u4f4d\u9519\u8bef\u3002\u5982\u679c CRC \u9519\u8bef\u53ea\u5728\u7279\u5b9a\u8bbe\u5907\u542f\u52a8\u65f6\u51fa\u73b0\uff0c\u57fa\u672c\u53ef\u4ee5\u9501\u5b9a\u5e72\u6270\u6e90\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u7b2c\u56db\u5c42\uff1a\u5e94\u7528\u5c42\u68c0\u67e5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u94fe\u8def\u5c42\u901a\u4e86\uff08\u4ece\u7ad9\u6709\u54cd\u5e94\u4e14 CRC \u6b63\u786e\uff09\uff0c\u4f46\u8fd4\u56de\u7684\u6570\u636e\u4e0d\u5bf9\u6216\u529f\u80fd\u4e0d\u5982\u9884\u671f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6.1 \u4ece\u7ad9\u5730\u5740<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u5e27\u7684\u7b2c\u4e00\u4e2a\u5b57\u8282\u662f\u4ece\u7ad9\u5730\u5740\u3002\u5730\u5740\u8303\u56f4 1-247\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5730\u5740 0 \u662f\u5e7f\u64ad\u5730\u5740\u2014\u2014\u4e3b\u7ad9\u7528 0 \u53d1\u5199\u547d\u4ee4\uff0c\u6240\u6709\u4ece\u7ad9\u6267\u884c\u4f46\u4e0d\u56de\u5e94\u3002\u5982\u679c\u4f60\u7528\u5730\u5740 0 \u53d1\u4e86\u8bfb\u547d\u4ee4\uff0c\u4e0d\u4f1a\u6709\u4efb\u4f55\u4ece\u7ad9\u54cd\u5e94\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u65b0\u8bbe\u5907\u51fa\u5382\u9ed8\u8ba4\u5730\u5740\u662f 1\u3002\u5982\u679c\u4f60\u603b\u7ebf\u4e0a\u5df2\u7ecf\u6709\u4e86\u4e00\u53f0\u5730\u5740 1 \u7684\u8bbe\u5907\uff0c\u53c8\u52a0\u4e0a\u4e00\u53f0\u51fa\u5382\u9ed8\u8ba4\u5730\u5740\u4e5f\u662f 1 \u7684\u65b0\u8bbe\u5907\uff0c\u4e24\u53f0\u8bbe\u5907\u4f1a\u5728\u4e3b\u7ad9\u5bfb\u5740 1 \u65f6\u540c\u65f6\u54cd\u5e94\u2014\u2014\u603b\u7ebf\u51b2\u7a81\uff0c\u4e3b\u7ad9\u6536\u5230\u7684\u6570\u636e\u662f\u4e24\u8def\u4fe1\u53f7\u7684\u53e0\u52a0\uff0c\u8868\u73b0\u4e3a CRC \u9519\u8bef\u6216\u4e71\u7801\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6392\u67e5\u65b9\u6cd5\uff1a\u4e00\u6b21\u53ea\u5f80\u603b\u7ebf\u4e0a\u63a5\u4e00\u4e2a\u4ece\u7ad9\uff0c\u9010\u4e2a\u6d4b\u8bd5\u3002<\/strong> \u8fd9\u662f\u6700\u7b28\u4f46\u6700\u6709\u6548\u7684\u65b9\u6cd5\u3002\u4e00\u6b21\u6d4b\u901a\u4e86\u518d\u52a0\u4e0b\u4e00\u4e2a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6.2 \u5bc4\u5b58\u5668\u5730\u5740\u504f\u79fb<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus \u7684\u5bc4\u5b58\u5668\u5730\u5740\u6709\u4e24\u4e2a\u6982\u5ff5\uff0c\u641e\u6df7\u4e86\u5c31\u4f1a\u8bfb\u5230\u9519\u8bef\u7684\u6570\u636e\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>\u534f\u8bae\u5730\u5740\uff1a<\/strong> \u5e27\u91cc\u586b\u7684 16 \u4f4d\u6570\u503c\uff0c\u4ece 0 \u5f00\u59cb\u3002\u529f\u80fd\u7801 03 \u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\u65f6\uff0c\u534f\u8bae\u5730\u5740 0 \u5bf9\u5e94\u7684\u662f\u7b2c 1 \u4e2a\u4fdd\u6301\u5bc4\u5b58\u5668\u3002 &#8211; <strong>PLC \u5730\u5740\uff1a<\/strong> \u5382\u5546\u5728\u624b\u518c\u91cc\u5199\u7684\u7f16\u53f7\uff0c\u53ef\u80fd\u4ece 1 \u5f00\u59cb\uff0c\u4e5f\u53ef\u80fd\u4ece 40001 \u5f00\u59cb\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3e\u4f8b\uff1a\u8bbe\u5907\u624b\u518c\u5199\u300c\u9891\u7387\u8bbe\u5b9a\u503c\u5728\u5bc4\u5b58\u5668 40003\u300d\u3002\u8fd9\u4e2a 40003 \u53ef\u80fd\u6709\u4e09\u79cd\u542b\u4e49\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u5382\u5546\u4e60\u60ef<\/th><th>\u534f\u8bae\u5730\u5740<\/th><th>\u4f60\u5728\u5e27\u91cc\u586b\u7684\u503c<\/th><\/tr><\/thead>\n<tbody><tr><td>40003 \u5c31\u662f\u534f\u8bae\u5730\u5740<\/td><td>40003<\/td><td>40003\uff08\u8d85\u51fa\u5355\u5b57\u8282\u8303\u56f4\uff0c\u770b\u5382\u5546\u600e\u4e48\u5904\u7406\uff09<\/td><\/tr>\n<tr><td>40003 \u8868\u793a\u4fdd\u6301\u5bc4\u5b58\u5668\u533a\u7b2c 3 \u4e2a<\/td><td>2<\/td><td>00 02<\/td><\/tr>\n<tr><td>40003 \u8868\u793a\u4fdd\u6301\u5bc4\u5b58\u5668\u533a\u7b2c 3 \u4e2a\uff08\u4ece 0 \u5f00\u59cb\uff09<\/td><td>3<\/td><td>00 03<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u4e0d\u786e\u5b9a\uff0c\u4ece\u534f\u8bae\u5730\u5740 0 \u5f00\u59cb\uff0c\u8bfb 10 \u4e2a\u8fde\u7eed\u5bc4\u5b58\u5668\u3002\u770b\u54ea\u4e2a\u5730\u5740\u8fd4\u56de\u4e86\u4f60\u8ba4\u8bc6\u7684\u503c\uff08\u6bd4\u5982\u8bbe\u5907\u578b\u53f7\u7f16\u7801\u3001\u56fa\u4ef6\u7248\u672c\u53f7\u3001\u6216\u8005\u5f53\u524d\u9891\u7387\u8fd9\u4e9b\u5df2\u77e5\u6570\u636e\uff09\uff0c\u53cd\u63a8\u5382\u5546\u7684\u7f16\u5740\u65b9\u5f0f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6.3 \u529f\u80fd\u548c\u529f\u80fd\u7801<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus \u6807\u51c6\u529f\u80fd\u7801\u548c\u5bf9\u5e94\u7684\u6570\u636e\u533a\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; 01\uff1a\u8bfb\u7ebf\u5708\uff080xxxx\uff09 &#8211; 02\uff1a\u8bfb\u79bb\u6563\u8f93\u5165\uff081xxxx\uff09 &#8211; 03\uff1a\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\uff084xxxx\uff09 &#8211; 04\uff1a\u8bfb\u8f93\u5165\u5bc4\u5b58\u5668\uff083xxxx\uff09 &#8211; 05\uff1a\u5199\u5355\u7ebf\u5708 &#8211; 06\uff1a\u5199\u5355\u4fdd\u6301\u5bc4\u5b58\u5668 &#8211; 15\uff1a\u5199\u591a\u7ebf\u5708 &#8211; 16\uff1a\u5199\u591a\u4fdd\u6301\u5bc4\u5b58\u5668<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u5e76\u4e0d\u662f\u6bcf\u4e2a\u4ece\u7ad9\u90fd\u5b9e\u73b0\u4e86\u6240\u6709\u529f\u80fd\u7801\u3002\u4e00\u53f0\u7b80\u5355\u7684\u6e29\u63a7\u5668\u53ef\u80fd\u53ea\u652f\u6301 03 \u548c 06\u2014\u2014\u4f60\u53d1 16\uff08\u5199\u591a\u5bc4\u5b58\u5668\uff09\u5b83\u4e0d\u8ba4\u8bc6\uff0c\u56de\u5f02\u5e38\u7801 01\uff08\u975e\u6cd5\u529f\u80fd\u7801\uff09\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4ece\u7ad9\u56de\u4e86\u5f02\u5e38\u7801\uff0c\u5f02\u5e38\u7801\u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u5f02\u5e38\u7801<\/th><th>\u542b\u4e49<\/th><th>\u5e38\u89c1\u539f\u56e0<\/th><\/tr><\/thead>\n<tbody><tr><td>01<\/td><td>\u975e\u6cd5\u529f\u80fd<\/td><td>\u4ece\u7ad9\u4e0d\u652f\u6301\u8fd9\u4e2a\u529f\u80fd\u7801<\/td><\/tr>\n<tr><td>02<\/td><td>\u975e\u6cd5\u6570\u636e\u5730\u5740<\/td><td>\u5bc4\u5b58\u5668\u5730\u5740\u8d85\u51fa\u8303\u56f4<\/td><\/tr>\n<tr><td>03<\/td><td>\u975e\u6cd5\u6570\u636e\u503c<\/td><td>\u5199\u5165\u7684\u503c\u4e0d\u53ef\u63a5\u53d7\uff08\u8d85\u51fa\u91cf\u7a0b\u7b49\uff09<\/td><\/tr>\n<tr><td>04<\/td><td>\u4ece\u7ad9\u8bbe\u5907\u6545\u969c<\/td><td>\u4ece\u7ad9\u81ea\u68c0\u5931\u8d25<\/td><\/tr>\n<tr><td>05<\/td><td>\u786e\u8ba4<\/td><td>\u547d\u4ee4\u5df2\u63a5\u6536\u4f46\u9700\u8981\u65f6\u95f4\u5904\u7406<\/td><\/tr>\n<tr><td>06<\/td><td>\u4ece\u7ad9\u8bbe\u5907\u5fd9<\/td><td>\u6b63\u5728\u5904\u7406\u4e0a\u4e00\u4e2a\u547d\u4ee4<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6536\u5230\u5f02\u5e38\u7801\u662f\u597d\u4e8b\u2014\u2014\u8bf4\u660e\u94fe\u8def\u5c42\u901a\u4e86\uff0c\u7269\u7406\u5c42\u6ca1\u95ee\u9898\uff0c\u4f60\u53ef\u4ee5\u628a\u6ce8\u610f\u529b\u96c6\u4e2d\u5728\u5e94\u7528\u5c42\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">6.4 \u5b57\u8282\u5e8f\uff08\u5927\u7aef\/\u5c0f\u7aef\uff09<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus \u534f\u8bae\u89c4\u5b9a\u591a\u5b57\u8282\u6570\u636e\u4ee5\u5927\u7aef\u5e8f\u4f20\u8f93\uff08\u9ad8\u5b57\u8282\u5728\u524d\uff09\u3002\u4f46 32 \u4f4d\u6d6e\u70b9\u6570\u600e\u4e48\u4f20\uff1f\u6807\u51c6\u91cc\u6ca1\u6709\u5b9a\u4e49\u3002\u4e8e\u662f\u5404\u5bb6\u5382\u5546\u5404\u641e\u4e00\u5957\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; \u4e00\u4e9b\u5382\u5546\u7528 ABCD \u5e8f\uff08\u6700\u9ad8\u5b57\u8282\u5728\u524d\uff09 &#8211; \u4e00\u4e9b\u5382\u5546\u7528 CDAB \u5e8f\uff08\u4e24\u4e2a\u5b57\u4ea4\u6362\u4f4d\u7f6e\uff0c\u6bcf\u4e2a\u5b57\u5185\u90e8\u4ecd\u7136\u5927\u7aef\uff09 &#8211; \u4e00\u4e9b\u5382\u5546\u7528 BADC \u6216 DCBA<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u8bfb\u4e24\u4e2a\u8fde\u7eed\u7684\u4fdd\u6301\u5bc4\u5b58\u5668\u62fc\u6210\u4e00\u4e2a 32 \u4f4d\u6d6e\u70b9\u6570\uff0c\u8bfb\u5230\u7684\u503c\u548c\u671f\u671b\u503c\u5dee\u597d\u51e0\u4e2a\u6570\u91cf\u7ea7\uff0c\u5927\u6982\u7387\u662f\u5b57\u8282\u5e8f\u53cd\u4e86\u3002\u7528\u5df2\u77e5\u503c\u2014\u2014\u6bd4\u5982\u628a\u9891\u7387\u8bbe\u6210 50.0Hz\uff08IEEE 754 \u8868\u793a\u662f 0x42480000\uff09\u2014\u2014\u8bfb\u56de\u6765\uff0c\u770b\u5341\u516d\u8fdb\u5236\u6392\u5217\u987a\u5e8f\uff0c\u53cd\u63a8\u5382\u5546\u7684\u5b57\u8282\u5e8f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u9010\u6b65\u6dfb\u52a0\u4ece\u7ad9\u7684\u6b63\u786e\u65b9\u6cd5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u5728\u5047\u8bbe\u4f60\u6392\u67e5\u5b8c\u4e86\u4e00\u4e2a\u4ece\u7ad9\uff0c\u901a\u4fe1\u6b63\u5e38\u3002\u63a5\u4e0b\u6765\u8981\u52a0\u66f4\u591a\u4ece\u7ad9\u2014\u2014\u8fd9\u662f\u6700\u5bb9\u6613\u51fa\u5e7a\u86fe\u5b50\u7684\u73af\u8282\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u786e\u505a\u6cd5\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1. \u603b\u7ebf\u4e0a\u53ea\u7559\u4e00\u4e2a\u4ece\u7ad9\uff08\u4ece\u7ad9 A\uff09\uff0c\u786e\u8ba4 A \u901a\u4fe1\u6b63\u5e38\u3002 2. \u65ad\u5f00\u4ece\u7ad9 A\uff0c\u53ea\u63a5\u4ece\u7ad9 B\uff0c\u786e\u8ba4 B \u901a\u4fe1\u6b63\u5e38\u3002 3. A \u548c B \u540c\u65f6\u63a5\u4e0a\uff0c\u786e\u8ba4\u4e24\u8005\u90fd\u901a\u4fe1\u6b63\u5e38\u3002 4. \u5982\u679c A+B \u6b63\u5e38\uff0c\u65ad\u5f00\u6240\u6709\uff0c\u53ea\u63a5\u4ece\u7ad9 C\uff0c\u786e\u8ba4 C \u6b63\u5e38\u3002 5. A+B+C \u540c\u65f6\u63a5\u4e0a\uff0c\u786e\u8ba4\u4e09\u8005\u90fd\u6b63\u5e38\u3002 6. \u4ee5\u6b64\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5728\u7b2c 3 \u6b65 A+B \u540c\u65f6\u63a5\u4e0a\u540e\u51fa\u95ee\u9898\uff0c\u68c0\u67e5\u8fd9\u4e24\u4ef6\u4e8b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>\u5730\u5740\u51b2\u7a81\uff1a<\/strong> A \u548c B \u7684\u4ece\u7ad9\u5730\u5740\u662f\u4e0d\u662f\u76f8\u540c\u3002 &#8211; <strong>\u7ec8\u7aef\u7535\u963b\u7d2f\u79ef\uff1a<\/strong> A \u548c B \u662f\u4e0d\u662f\u90fd\u5185\u90e8\u542f\u7528\u4e86 120\u03a9 \u7ec8\u7aef\u7535\u963b\u3002\u53c2\u89c1 3.3 \u8282\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u5728\u7b2c 5 \u6b65 A+B+C \u540c\u65f6\u63a5\u4e0a\u540e\u51fa\u95ee\u9898\uff08\u524d\u4e24\u6b65\u90fd\u6b63\u5e38\uff09\uff0c\u5927\u6982\u7387\u662f\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8211; <strong>\u603b\u7ebf\u9a71\u52a8\u80fd\u529b\u4e0d\u8db3\u3002<\/strong> \u6bcf\u4e2a\u4ece\u7ad9\u7684 RS-485 \u6536\u53d1\u5668\u5728\u63a5\u6536\u72b6\u6001\u4e0b\u90fd\u6709\u4e00\u4e2a\u8f93\u5165\u963b\u6297\uff08\u6807\u51c6 \u2265 12k\u03a9\uff09\u3002\u6309\u7167 RS-485 \u6807\u51c6\uff0c\u4e00\u6761\u603b\u7ebf\u4e0a\u6700\u591a 32 \u4e2a\u5355\u4f4d\u8d1f\u8f7d\u3002\u5982\u679c\u4f60\u7528\u7684\u662f 1\/4 \u6216 1\/8 \u8d1f\u8f7d\u7684\u6536\u53d1\u5668\uff0c\u6570\u91cf\u53ef\u4ee5\u66f4\u591a\u3002\u4f46\u5982\u679c\u7528\u6700\u4fbf\u5b9c\u7684 MAX485 \u7ea7\u522b\u82af\u7247\uff0c\u6302 30 \u4e2a\u4ece\u7ad9\u540e\u4fe1\u53f7\u8870\u51cf\u4f1a\u5f88\u660e\u663e\u3002\u89e3\u51b3\u65b9\u6848\uff1a\u9009 1\/4 \u6216 1\/8 \u8d1f\u8f7d\u7684\u6536\u53d1\u5668\uff0c\u6216\u8005\u52a0 RS-485 \u4e2d\u7ee7\u5668\u3002 &#8211; <strong>\u603b\u7ebf\u62d3\u6251\u6709\u95ee\u9898\u3002<\/strong> RS-485 \u5fc5\u987b\u662f\u83ca\u82b1\u94fe\uff08Daisy Chain\uff09\uff0c\u4e0d\u80fd\u661f\u661f\u5f62\u5206\u652f\u3002\u661f\u5f62\u62d3\u6251\u4f1a\u4ea7\u751f\u4fe1\u53f7\u53cd\u5c04\uff0c\u53cd\u5c04\u4f4d\u7f6e\u521a\u597d\u5728\u5206\u652f\u70b9\u3002\u5982\u679c\u73b0\u573a\u5e03\u7ebf\u5df2\u7ecf\u661f\u661f\u5f62\u4e86\u4e14\u6ca1\u6cd5\u6539\uff0c\u52a0 RS-485 Hub \u6216\u4e2d\u7ee7\u5668\u6765\u9694\u79bb\u5404\u5206\u652f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u4e3b\u7ad9\u8f6e\u8be2\u7b56\u7565\u4e0e\u8d85\u65f6\u8bbe\u7f6e<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">8.1 \u8d85\u65f6\u65f6\u95f4\u600e\u4e48\u7b97<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modbus RTU \u7684\u8d85\u65f6\u5206\u4e24\u4e2a\u5c42\u9762\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5b57\u7b26\u95f4\u8d85\u65f6\uff08t1.5\uff09\uff1a<\/strong> \u4e24\u4e2a\u8fde\u7eed\u5b57\u8282\u4e4b\u95f4\u7684\u6700\u5927\u5141\u8bb8\u95f4\u9694\uff0c\u8bbe\u4e3a\u4f20\u8f93 1.5 \u4e2a\u5b57\u7b26\u7684\u65f6\u95f4\u3002\u7528\u6765\u5224\u65ad\u4e00\u5e27\u662f\u5426\u7ed3\u675f\u3002\u5728 9600 \u6ce2\u7279\u7387\u4e0b\uff0c\u4e00\u4e2a\u5b57\u7b26\uff0811 \u4f4d\uff09\u7ea6 1.15ms\uff0ct1.5 \u2248 1.75ms\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5e27\u95f4\u8d85\u65f6\uff08t3.5\uff09\uff1a<\/strong> \u4e24\u4e2a\u8fde\u7eed\u5e27\u4e4b\u95f4\u7684\u6700\u5c0f\u95f4\u9694\uff0c\u8bbe\u4e3a\u4f20\u8f93 3.5 \u4e2a\u5b57\u7b26\u7684\u65f6\u95f4\u3002\u5728 9600 \u6ce2\u7279\u7387\u4e0b\uff0ct3.5 \u2248 4ms\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4f60\u7684\u4e3b\u7ad9\u53d1\u5b8c\u8bf7\u6c42\u540e\u7b49 30ms \u8fd8\u6ca1\u6709\u6536\u5230\u54cd\u5e94\uff0c\u4e0d\u80fd\u7b80\u5355\u5730\u8ba4\u4e3a\u4ece\u7ad9\u574f\u4e86\u3002\u6709\u4e9b\u4ece\u7ad9\uff08\u5c24\u5176\u662f\u4f4e\u901f MCU \u9a71\u52a8\u7684\u6e29\u63a7\u5668\u3001\u7535\u80fd\u8868\uff09\u5904\u7406\u4e00\u4e2a\u8bf7\u6c42\u9700\u8981 50-100ms\u3002\u628a\u8fd9\u4e2a\u503c\u8bbe\u6210\u81f3\u5c11 200ms \u4f5c\u4e3a\u8d77\u59cb\u503c\uff0c\u786e\u8ba4\u901a\u4fe1\u6b63\u5e38\u540e\u518d\u6839\u636e\u5b9e\u9645\u54cd\u5e94\u65f6\u95f4\u8c03\u77ed\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8.2 \u5148\u8bfb\u540e\u5199<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5c1d\u8bd5\u5199\u4efb\u4f55\u5bc4\u5b58\u5668\u4e4b\u524d\uff0c\u5148\u8bfb\u4e00\u4e2a\u5df2\u77e5\u7684\u5bc4\u5b58\u5668\uff08\u6bd4\u5982\u8bbe\u5907\u578b\u53f7\u3001\u56fa\u4ef6\u7248\u672c\u53f7\u3001\u6216\u8005\u4e00\u4e2a\u4f60\u5df2\u77e5\u5f53\u524d\u503c\u7684\u5bc4\u5b58\u5668\uff09\u3002\u786e\u8ba4\u8bfb\u64cd\u4f5c\u6b63\u5e38\u540e\uff0c\u518d\u5c1d\u8bd5\u5199\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4e0d\u8981\u4e00\u4e0a\u6765\u5c31\u5f80\u7ebf\u5708\u91cc\u5199 1\u3002<\/strong> \u4f60\u4e0d\u77e5\u9053\u90a3\u4e2a\u7ebf\u5708\u63a7\u5236\u7684\u662f\u4ec0\u4e48\u2014\u2014\u53ef\u80fd\u662f\u6025\u505c\u4fe1\u53f7\u3002\u7528 06 \u529f\u80fd\u7801\u5199\u4fdd\u6301\u5bc4\u5b58\u5668\u540c\u7406\uff0c\u5148\u60f3\u6e05\u695a\u4f60\u5199\u7684\u5bc4\u5b58\u5668\u662f\u5e72\u4ec0\u4e48\u7684\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e5d\u3001\u6392\u67e5\u6e05\u5355\u901f\u67e5\u8868<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5de5\u63a7\u73b0\u573a\uff0c\u4f60\u53ef\u80fd\u6ca1\u6709\u6761\u4ef6\u4e00\u6b65\u4e00\u6b65\u6309\u672c\u6587\u987a\u5e8f\u6765\u3002\u628a\u8fd9\u5f20\u8868\u62cd\u7167\u5b58\u624b\u673a\u91cc\uff0c\u8c03\u8bd5\u65f6\u5bf9\u7740\u67e5\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u5e8f\u53f7<\/th><th>\u68c0\u67e5\u9879<\/th><th>\u5de5\u5177<\/th><th>\u901a\u8fc7\u6807\u51c6<\/th><\/tr><\/thead>\n<tbody><tr><td>1<\/td><td>A\/B \u7ebf\u901a\u65ad<\/td><td>\u4e07\u7528\u8868\u7535\u963b\u6863<\/td><td>A \u7ebf\u5bfc\u901a\uff0cB \u7ebf\u5bfc\u901a<\/td><\/tr>\n<tr><td>2<\/td><td>A\/B \u7ebf\u4e0d\u77ed\u8def<\/td><td>\u4e07\u7528\u8868\u7535\u963b\u6863<\/td><td>A-B \u7535\u963b &gt; 1k\u03a9<\/td><\/tr>\n<tr><td>3<\/td><td>\u7a7a\u95f2\u7535\u538b<\/td><td>\u4e07\u7528\u8868 DC \u7535\u538b\u6863<\/td><td>A &gt; B\uff0c\u5dee\u503c &gt; 200mV<\/td><\/tr>\n<tr><td>4<\/td><td>\u7ec8\u7aef\u7535\u963b<\/td><td>\u4e07\u7528\u8868\u7535\u963b\u6863\uff08\u8bbe\u5907\u65ad\u7535\uff09<\/td><td>A-B \u7535\u963b 120\u03a9 \u6216 &gt; 1k\u03a9\uff08\u53d6\u51b3\u4e8e\u662f\u5426\u542f\u7528\uff09<\/td><\/tr>\n<tr><td>5<\/td><td>\u504f\u7f6e\u7535\u963b<\/td><td>\u4e07\u7528\u8868\u7535\u963b\u6863\uff08\u8bbe\u5907\u65ad\u7535\uff09<\/td><td>A-VCC \u548c B-GND \u5404\u7ea6 680\u03a9<\/td><\/tr>\n<tr><td>6<\/td><td>\u6ce2\u7279\u7387\/\u6821\u9a8c\/\u505c\u6b62\u4f4d<\/td><td>\u8bbe\u5907\u624b\u518c<\/td><td>\u4e0e\u4ece\u7ad9\u624b\u518c\u4e00\u81f4<\/td><\/tr>\n<tr><td>7<\/td><td>\u53d1\u7a7a\u5e27\u6d4b\u8bd5<\/td><td>\u4e32\u53e3\u52a9\u624b<\/td><td>\u4ece\u7ad9\u5bf9 <code>01 03 00 00 00 01 84 0A<\/code> \u6709\u56de\u5e94<\/td><\/tr>\n<tr><td>8<\/td><td>CRC \u6b63\u786e<\/td><td>CRC \u8ba1\u7b97\u5668<\/td><td>\u4e3b\u7ad9\u53d1\u51fa\u7684 CRC \u4e0e\u8ba1\u7b97\u4e00\u81f4<\/td><\/tr>\n<tr><td>9<\/td><td>\u54cd\u5e94 CRC \u6b63\u786e<\/td><td>CRC \u8ba1\u7b97\u5668<\/td><td>\u4ece\u7ad9\u54cd\u5e94\u7684 CRC \u4e0e\u8ba1\u7b97\u4e00\u81f4<\/td><\/tr>\n<tr><td>10<\/td><td>\u4ece\u7ad9\u5730\u5740\u552f\u4e00<\/td><td>\u9010\u4e2a\u63a5\u5165\u6d4b\u8bd5<\/td><td>\u603b\u7ebf\u4e0a\u6ca1\u6709\u91cd\u590d\u5730\u5740<\/td><\/tr>\n<tr><td>11<\/td><td>\u5bc4\u5b58\u5668\u5730\u5740\u6b63\u786e<\/td><td>\u4ece 0 \u5f00\u59cb\u8bfb\u8fde\u7eed 10 \u4e2a<\/td><td>\u8fd4\u56de\u6570\u636e\u542b\u5df2\u77e5\u503c<\/td><\/tr>\n<tr><td>12<\/td><td>\u5b57\u8282\u5e8f\u6b63\u786e<\/td><td>\u8bfb\u5df2\u77e5\u503c\u5bf9\u7167<\/td><td>32 \u4f4d\u503c\u89e3\u6790\u7b26\u5408\u5382\u5546\u89c4\u8303<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5341\u3001FAQ\uff1a\u9ad8\u9891\u6392\u969c\u95ee\u9898<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q1\uff1a\u4e3b\u7ad9\u53d1\u6570\u636e\uff0c\u4ece\u7ad9\u5076\u5c14\u56de\u5076\u5c14\u4e0d\u56de\uff0c\u6ce2\u7279\u7387 9600\u3002\u4e3a\u4ec0\u4e48\uff1f<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\uff1a\u5076\u5c14\u6027\u95ee\u9898\u6700\u5e38\u89c1\u7684\u539f\u56e0\u662f A\/B \u7ebf\u63a5\u53cd\u3001\u7ec8\u7aef\u7535\u963b\u914d\u7f6e\u4e0d\u5f53\u3001\u6216\u7535\u6e90\u5e72\u6270\u3002\u5148\u67e5 A\/B \u6781\u6027\uff0c\u518d\u67e5\u7ec8\u7aef\u7535\u963b\u4f4d\u7f6e\u548c\u6570\u91cf\uff0c\u6700\u540e\u7528\u793a\u6ce2\u5668\u770b\u6ce2\u5f62\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q2\uff1aUSB-485 \u8f6c\u6362\u5668\u5728\u6d4b\u8bd5\u53f0\u4e0a\u6b63\u5e38\uff0c\u4e00\u5230\u73b0\u573a\u5c31\u4e0d\u884c\u3002\u6362\u4e86\u597d\u51e0\u4e2a\u8f6c\u6362\u5668\u90fd\u4e00\u6837\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\uff1a\u4e24\u4e2a\u53ef\u80fd\u3002\u4e00\u662f\u73b0\u573a\u7684 RS-485 \u7ebf\u8def\u4e0a\u6709\u5f3a\u5171\u6a21\u5e72\u6270\uff0c\u666e\u901a USB-485 \u8f6c\u6362\u5668\u7684\u5171\u6a21\u6291\u5236\u6bd4\u4e0d\u591f\u3002\u6362\u4e00\u4e2a\u5e26\u9694\u79bb\u7684\u5de5\u4e1a\u7ea7 USB-485 \u8f6c\u6362\u5668\uff08\u6bd4\u5982\u5b87\u6cf0 UT-890A \u6216\u540c\u7b49\u4ea7\u54c1\uff09\u3002\u4e8c\u662f\u73b0\u573a\u7684\u7535\u8111 USB \u53e3\u63a5\u5730\u548c RS-485 \u8bbe\u5907\u7684\u5730\u4e4b\u95f4\u6709\u7535\u4f4d\u5dee\uff0c\u901a\u8fc7\u8f6c\u6362\u5668\u5f62\u6210\u56de\u8def\u3002\u9694\u79bb\u578b\u8f6c\u6362\u5668\u80fd\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q3\uff1a\u591a\u4e2a\u4ece\u7ad9\u8f6e\u8be2\u65f6\uff0c\u7b2c\u4e00\u4e2a\u603b\u662f\u901a\uff0c\u540e\u9762\u51e0\u4e2a\u7ecf\u5e38\u4e0d\u901a\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\uff1a\u68c0\u67e5\u4e3b\u7ad9\u7684\u8f6e\u8be2\u95f4\u9694\u3002\u5982\u679c\u4f60\u5728\u53d1\u5b8c\u4e0a\u4e00\u4e2a\u8bf7\u6c42\u540e\u7acb\u5373\u53d1\u4e0b\u4e00\u4e2a\uff0c\u800c\u603b\u7ebf\u4e0a\u7684\u4e0a\u4e00\u4e2a\u54cd\u5e94\u8fd8\u6ca1\u4f20\u5b8c\uff0c\u5c31\u4f1a\u53d1\u751f\u51b2\u7a81\u3002\u786e\u4fdd\u4e24\u6b21\u8f6e\u8be2\u4e4b\u95f4\u7684\u95f4\u9694 \u2265 \u4ece\u7ad9\u6570\u91cf \u00d7\uff08\u8bf7\u6c42\u65f6\u95f4 + \u54cd\u5e94\u65f6\u95f4 + t3.5\uff09\u3002\u5728 9600 \u6ce2\u7279\u7387\u4e0b\uff0c\u5982\u679c\u6bcf\u4e2a\u4ece\u7ad9\u7684\u5e73\u5747\u54cd\u5e94\u65f6\u95f4\u662f 15ms\uff0c10 \u4e2a\u4ece\u7ad9\u7684\u8f6e\u8be2\u95f4\u9694\u81f3\u5c11\u8bbe 200ms\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q4\uff1aCRC \u603b\u662f\u62a5\u9519\uff0c\u68c0\u67e5\u4e86 A\/B \u6781\u6027\u548c\u6ce2\u7279\u7387\u90fd\u6ca1\u95ee\u9898\u3002<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\uff1a\u7528\u903b\u8f91\u5206\u6790\u4eea\u6216\u793a\u6ce2\u5668\u68c0\u67e5\u4fe1\u53f7\u8d28\u91cf\u3002\u770b\u4e0a\u5347\u6cbf\u548c\u4e0b\u964d\u6cbf\u7684\u659c\u7387\uff0c\u5982\u679c\u8fc7\u4e8e\u5e73\u7f13\uff08&gt; 30% \u4f4d\u5bbd\uff09\uff0c\u53ef\u80fd\u662f\u7ebf\u5bb9\u592a\u5927\u6216\u9a71\u52a8\u80fd\u529b\u4e0d\u8db3\u3002\u964d\u4f4e\u6ce2\u7279\u7387\u5230 4800 \u8bd5\u8bd5\u3002\u5982\u679c\u80fd\u901a\uff0c\u8bf4\u660e\u4fe1\u53f7\u8d28\u91cf\u786e\u5b9e\u662f\u95ee\u9898\u6839\u6e90\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Q5\uff1a\u600e\u4e48\u77e5\u9053\u4ece\u7ad9\u5230\u5e95\u652f\u4e0d\u652f\u6301 Modbus\uff1f<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A\uff1a\u53d1 <code>01 03 00 00 00 01 84 0A<\/code> \u8fc7\u53bb\u3002\u5982\u679c\u4e0d\u56de\uff0c\u518d\u7528 9600\/19200\/4800 \u4e09\u79cd\u6ce2\u7279\u7387\u5404\u8bd5\u4e00\u904d\uff088-N-1 \u548c 8-E-1 \u5404\u4e00\u904d\uff09\u3002\u5982\u679c\u5168\u90fd\u4e0d\u56de\uff0c\u68c0\u67e5\u4ee5\u4e0b\u53ef\u80fd\u2014\u2014\u8bbe\u5907\u6839\u672c\u6ca1\u901a\u7535\u3001RS-485 \u63a5\u53e3\u672a\u4f7f\u80fd\u9700\u8981\u8df3\u7ebf\u6216\u914d\u7f6e\u3001\u8bbe\u5907 RS-485 \u53ea\u652f\u6301 ASCII \u6a21\u5f0f\u3001\u8bbe\u5907\u9700\u8981\u7279\u6b8a\u7684\u5524\u9192\u5e8f\u5217\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<p class=\"wp-block-paragraph\">\u6709\u95ee\u9898\u518d\u804a\u3002\u73b0\u573a\u8c03\u8bd5\u8fd9\u79cd\u4e8b\uff0c\u6587\u5b57\u80fd\u8bf4\u6e05\u695a\u516b\u6210\uff0c\u5269\u4e0b\u4e24\u6210\u9760\u4f60\u81ea\u5df1\u53bb\u8bd5\u3002\u4e0d\u8fc7\u53ea\u8981\u6309\u8fd9\u4e2a\u987a\u5e8f\u6765\uff0c\u4e0d\u8d70\u56de\u5934\u8def\uff0c\u4e00\u4e2a\u4e0b\u5348\u8db3\u591f\u628a\u5927\u591a\u6570 Modbus \u901a\u4fe1\u95ee\u9898\u641e\u5b9a\u4e86\u3002<\/p>\n<span id=\"magicpostMarker\"><\/span>","protected":false},"excerpt":{"rendered":"<p>\u6765\u6e90\uff1aModbus\u4e2d\u6587\u7f51\uff08modbus.cn\uff09 \u2014\u2014 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