{"id":6705,"date":"2022-03-15T10:47:40","date_gmt":"2022-03-15T02:47:40","guid":{"rendered":"https:\/\/www.modbus.cn\/?p=6705"},"modified":"2026-07-01T09:42:45","modified_gmt":"2026-07-01T01:42:45","slug":"modbus-rs485-jie-xian-fang-fa","status":"publish","type":"post","link":"https:\/\/www.modbus.cn\/en\/6705.html","title":{"rendered":"Modbus RS485\u63a5\u7ebf\u65b9\u6cd5"},"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 RS-485 \u63a5\u7ebf\u5b8c\u6574\u624b\u518c\uff1a\u4ece\u7ebf\u7f06\u9009\u578b\u5230\u8c03\u8bd5\u8dd1\u901a \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\uff1aRS-485 \u63a5\u7ebf\u662f Modbus \u901a\u4fe1\u7684\u7b2c\u4e00\u9053\u95e8\u69db\uff0c\u8fd9\u9053\u95e8\u69db\u6321\u4f4f\u4e86\u65e0\u6570\u65b0\u624b\u2014\u2014\u4e0d\u662f\u56e0\u4e3a\u539f\u7406\u96be\uff0c\u800c\u662f\u56e0\u4e3a\u7ec6\u8282\u592a\u591a\u3001\u5bb9\u9519\u592a\u4f4e\u3002\u672c\u6587\u4ece A\/B \u7ebf\u8fa8\u8ba4\u3001\u62d3\u6251\u7ed3\u6784\u3001\u7ebf\u6750\u9009\u62e9\u3001\u5c4f\u853d\u5c42\u63a5\u5730\u3001\u7ec8\u7aef\u7535\u963b\u4e0e\u504f\u7f6e\u7535\u963b\u914d\u7f6e\u3001\u9632\u96f7\u4fdd\u62a4\u5230\u8c03\u8bd5\u6392\u67e5\u5168\u6d41\u7a0b\u8986\u76d6\uff0c\u6bcf\u4e00\u6761\u5efa\u8bae\u90fd\u6765\u81ea\u73b0\u573a\u4e8b\u6545\uff0c\u6bcf\u4e00\u4e2a\u53c2\u6570\u90fd\u53ef\u4ee5\u76f4\u63a5\u5bf9\u7740\u65bd\u5de5\u3002\u5173\u952e\u8bcd\uff1aRS-485\u63a5\u7ebf\u3001Modbus\u5e03\u7ebf\u3001\u7ec8\u7aef\u7535\u963b\u3001\u504f\u7f6e\u7535\u963b\u3001\u5c4f\u853d\u63a5\u5730\u3001\u624b\u62c9\u624b\u62d3\u6251\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<p class=\"wp-block-paragraph\">\u73b0\u573a\u6700\u5e38\u89c1\u7684\u4e00\u5e55\uff1a\u8bbe\u5907\u90fd\u88c5\u597d\u4e86\u3001\u53c2\u6570\u4e5f\u914d\u4e86\u3001\u7a0b\u5e8f\u4e5f\u5199\u4e86\uff0c\u901a\u7535\u4e00\u6d4b\u2014\u2014\u901a\u4fe1\u706f\u4e0d\u95ea\u3002\u62ff\u4e07\u7528\u8868\u4e00\u91cf A\/B \u7ebf\uff0c\u7535\u538b\u4e00\u76f4\u5728 0.3V \u548c 1.8V \u4e4b\u95f4\u8df3\uff0c\u6839\u672c\u6ca1\u5230 5V \u7684\u5dee\u5206\u6446\u5e45\u3002\u518d\u67e5\u7ebf\u2014\u2014A \u548c B \u63a5\u53cd\u4e86\u3002\u534a\u5c0f\u65f6\u7684\u6d3b\u53d8\u6210\u4e86\u4e09\u5c0f\u65f6\u7684\u73b0\u573a\u6392\u67e5\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u63a5\u7ebf\u5c31\u662f\u8fd9\u4e48\u4e00\u4f4d\u813e\u6c14\u53e4\u602a\u7684\u8001\u5b9e\u4eba\uff1a\u89c4\u5219\u5176\u5b9e\u5f88\u7b80\u5355\uff0c\u4f46\u4f60\u4e0d\u9075\u5b88\u5b83\uff0c\u5b83\u7edd\u5bf9\u4e0d\u8ddf\u4f60\u5e9f\u8bdd\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u8ba4\u8bc6 RS-485 \u7684\u4fe1\u53f7\u7ebf\uff1a\u54ea\u6839\u662f A\u3001\u54ea\u6839\u662f B<\/h2>\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u901a\u4fe1\u53ea\u9760\u4e24\u6839\u5dee\u5206\u4fe1\u53f7\u7ebf\u2014\u2014\u4e60\u60ef\u4e0a\u6807\u8bb0\u4e3a A\uff08\u6216 D-\uff09\u548c B\uff08\u6216 D+\uff09\u3002\u5dee\u5206\u4f20\u8f93\u7684\u610f\u601d\u662f\uff1a\u4e0d\u9760\u5355\u6839\u7ebf\u7684\u7535\u538b\u7edd\u5bf9\u503c\u6765\u4f20\u6570\u636e\uff0c\u800c\u662f\u6bd4\u8f83 A \u548c B \u4e24\u6839\u7ebf\u4e4b\u95f4\u7684\u7535\u538b\u5dee\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5f53 B \u7ebf\u7535\u538b\u9ad8\u4e8e A \u7ebf\u7535\u538b 200mV \u4ee5\u4e0a\uff08\u5373 B &#8211; A &gt; +200mV\uff09\uff0c\u8868\u793a\u903b\u8f91 1\u3002\u5f53 A \u7ebf\u7535\u538b\u9ad8\u4e8e B \u7ebf\u7535\u538b 200mV \u4ee5\u4e0a\uff08\u5373 B &#8211; A &lt; -200mV\uff09\uff0c\u8868\u793a\u903b\u8f91 0\u3002\u5982\u679c A \u548c B \u4e4b\u95f4\u7684\u7535\u538b\u5dee\u5728 \u00b1200mV \u4e4b\u95f4\uff0c\u8fd9\u662f\u4e0d\u786e\u5b9a\u72b6\u6001\u2014\u2014\u63a5\u6536\u7aef\u4e0d\u77e5\u9053\u8fd9\u662f 1 \u8fd8\u662f 0\uff0c\u53ef\u80fd\u4f1a\u8bfb\u5230\u968f\u673a\u566a\u58f0\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u4f60\u5fc5\u987b\u786e\u8ba4 A \u548c B \u6ca1\u63a5\u53cd\u2014\u2014\u53cd\u4e86\u4e4b\u540e\uff0c\u53d1\u9001\u7aef\u7684\u903b\u8f91 1 \u5728\u63a5\u6536\u7aef\u53d8\u6210\u903b\u8f91 0\uff0cModbus \u5e27\u7684\u6bcf\u4e2a\u5b57\u8282\u5168\u4e71\u5957\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">1.1 \u5382\u5546\u7684 A\/B \u6807\u51c6\uff1a\u4e0d\u662f\u6bcf\u4e2a\u5382\u5546\u90fd\u6807\u300cA\u300d\u548c\u300cB\u300d<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u662f RS-485 \u63a5\u7ebf\u6700\u5751\u7684\u5730\u65b9\u2014\u2014\u4e0d\u540c\u5382\u5546\u5bf9 A \u548c B \u7684\u5b9a\u4e49\u662f\u53cd\u8fc7\u6765\u7684\u3002\u6709\u7684\u6807\u300cA = \u6b63\u6781\uff08B+\uff09\u3001B = \u8d1f\u6781\uff08A-\uff09\u300d\uff0c\u6709\u7684\u6807\u300cA = D-\u3001B = D+\u300d\u3002\u800c\u4e14 Modbus \u89c4\u8303\u672c\u8eab\u5e76\u6ca1\u6709\u5f3a\u5236 A\/B \u7684\u547d\u540d\u65b9\u5f0f\uff0c\u5b83\u53ea\u89c4\u5b9a\u4e86\u5dee\u5206\u4fe1\u53f7\u7684\u7535\u6c14\u7279\u6027\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u4f60\u624b\u4e0a\u62ff\u5230\u7684\u8bf4\u660e\u4e66\u5982\u679c\u662f\u82f1\u6587\u7248\uff0c\u53ef\u80fd\u6807\u7684\u662f D+\u3001D-\u3001Tx+\u3001Tx-\u3002\u5982\u679c\u662f\u56fd\u4ea7\u4eea\u8868\uff0c\u53ef\u80fd\u6807 A\u3001B\u3001GND\u3002\u600e\u4e48\u786e\u8ba4\uff1f\u7528\u4e07\u7528\u8868\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">1.2 \u7528\u4e07\u7528\u8868\u786e\u5b9a A\/B \u7ebf\u7684\u7ec8\u6781\u65b9\u6cd5<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8bbe\u5907\u4e0a\u7535\u4f46\u7a7a\u95f2\u65f6\uff08\u6ca1\u6709\u901a\u4fe1\uff09\uff0c\u7528\u4e07\u7528\u8868\u76f4\u6d41\u7535\u538b\u6863\u5206\u522b\u6d4b\u91cf A \u5bf9 GND \u548c B \u5bf9 GND \u7684\u7535\u538b\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u7a7a\u95f2\u72b6\u6001\u4e0b\uff08\u6ca1\u6709\u6570\u636e\u4f20\u8f93\uff09\uff0c\u603b\u7ebf\u7684\u9ed8\u8ba4\u72b6\u6001\u7528\u504f\u7f6e\u7535\u963b\u4fdd\u6301\u7740\uff1aB \u7ebf\u7535\u538b\u5e94\u8be5\u9ad8\u4e8e A \u7ebf\u3002\u5178\u578b\u503c\uff1aB \u5bf9\u5730\u7ea6 2.5V~3.5V\uff0cA \u5bf9\u5730\u7ea6 1.5V~2.5V\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u6d4b\u51fa\u6765 A \u6bd4 B \u9ad8\u2014\u2014\u90a3 A \u548c B \u7684\u5b9a\u4e49\u548c\u4f60\u8bd5\u7684\u8fd9\u53f0\u8bbe\u5907\u521a\u597d\u53cd\u4e86\uff0c\u4e92\u6362\u5373\u901a\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u8fd8\u6709\u4e00\u4e2a\u73b0\u573a\u901f\u5224\u6cd5\uff1a\u5148\u628a\u6240\u6709\u8bbe\u5907\u7684 A \u8fde\u5230 A\u3001B \u8fde\u5230 B\u3001GND \u8fde\u5230 GND\u3002\u901a\u7535\u540e\u7528\u4e07\u7528\u8868\u4ea4\u6d41\u7535\u538b\u6863\u6d4b A-B \u4e4b\u95f4\u7684\u7535\u538b\u3002\u5982\u679c\u901a\u4fe1\u6b63\u5e38\uff0c\u5728\u6570\u636e\u4f20\u8f93\u77ac\u95f4\u4f60\u4f1a\u770b\u5230\u7535\u538b\u660e\u663e\u6ce2\u52a8\uff08\u51e0\u767e\u6beb\u4f0f\u5230\u51e0\u4f0f\u7684\u6446\u5e45\uff09\u3002\u5982\u679c\u4e00\u76f4\u6ca1\u6ce2\u52a8\uff0c\u8981\u4e48\u6ca1\u63a5\u7ec8\u7aef\u7535\u963b\u5bfc\u81f4\u603b\u7ebf\u6d6e\u7a7a\uff0c\u8981\u4e48 A\/B \u63a5\u53cd\u5bfc\u81f4\u6240\u6709\u4ece\u7ad9\u540c\u65f6\u8ba4\u4e3a\u63a5\u6536\u5230\u4e86\u9519\u8bef\u5e27\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u62d3\u6251\u7ed3\u6784\uff1a\u53ea\u80fd\u624b\u62c9\u624b\uff0c\u62d2\u7edd\u4e00\u5207\u5206\u652f<\/h2>\n\n\n<h3 class=\"wp-block-heading\">2.1 \u6b63\u786e\u7684\u62d3\u6251<\/h3>\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u603b\u7ebf\u5fc5\u987b\u91c7\u7528\u300c\u624b\u62c9\u624b\u300d\u83ca\u82b1\u94fe\u62d3\u6251\u2014\u2014\u4ece\u4e00\u53f0\u8bbe\u5907\u51fa\u6765\uff0c\u53ea\u63a5\u4e0b\u4e00\u53f0\u8bbe\u5907\uff0c\u4e0d\u5206\u652f\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\"><code>\u4e3b\u673a \u2500\u2500\u2500 [\u8bbe\u59071] \u2500\u2500\u2500 [\u8bbe\u59072] \u2500\u2500\u2500 [\u8bbe\u59073] \u2500\u2500\u2500 ... \u2500\u2500\u2500 [\u8bbe\u5907N]\n  \u2502           \u2502           \u2502           \u2502                   \u2502\n  \u2514\u2500 120\u03a9 \u2500\u2500\u2500\u2500\u2518           \u2502           \u2502                   \u2502\n                    \u7ee7\u7eed\u6309\u5e8f\u4e32\u8054          \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 120\u03a9 \u2500\u2500\u2518\n                                             \uff08\u672b\u7aef\u7ec8\u7aef\u7535\u963b\uff09<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u603b\u7ebf\u4e24\u7aef\u5404\u63a5\u4e00\u4e2a 120\u03a9 \u7ec8\u7aef\u7535\u963b\uff0c\u4e2d\u95f4\u8bbe\u5907\u4f9d\u6b21\u4e32\u8054\u3002\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/image.modbus.cn\/wp-content\/uploads\/2022\/03\/o4YBAF5H7yaAAyu_AAGShAEKSmQ470.png\" \/ loading=\"lazy\" title=\"Modbus RS485\u63a5\u7ebf\u65b9\u6cd5\u63d2\u56fe\" alt=\"Modbus RS485\u63a5\u7ebf\u65b9\u6cd5\u63d2\u56fe\" \/><\/figure>\n\n<\/p>\n\n\n<h3 class=\"wp-block-heading\">2.2 \u7edd\u5bf9\u7981\u6b62\u7684\u8fde\u63a5\u65b9\u5f0f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u661f\u5f62\u8fde\u63a5<\/strong>\uff1a\u6240\u6709\u8bbe\u5907\u4ece\u540c\u4e00\u4e2a\u96c6\u4e2d\u70b9\u653e\u5c04\u51fa\u6765\u3002<\/p>\n\n\n<pre class=\"wp-block-code\"><code>        \u250c\u2500\u2500 [\u8bbe\u59071]\n\u4e3b\u673a \u2500\u2500[\u8282\u70b9]\u2500\u2500 [\u8bbe\u59072]\n        \u2514\u2500\u2500 [\u8bbe\u59073]<\/code><\/pre>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u6811\u72b6\u5206\u652f<\/strong>\uff1a\u4ece\u603b\u7ebf\u4e2d\u6bb5\u5206\u51fa\u4e00\u6761\u5206\u652f\u6302\u8bbe\u5907\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/image.modbus.cn\/wp-content\/uploads\/2022\/03\/o4YBAF5H7zKALSf9AAGVwOrszwk893.png\" \/ loading=\"lazy\" title=\"Modbus RS485\u63a5\u7ebf\u65b9\u6cd5\u63d2\u56fe1\" alt=\"Modbus RS485\u63a5\u7ebf\u65b9\u6cd5\u63d2\u56fe1\" \/><\/figure>\n\n\n\u8fd9\u4e24\u79cd\u63a5\u6cd5\u7684\u95ee\u9898\u662f\u4fe1\u53f7\u53cd\u5c04\u53e0\u52a0\u2014\u2014\u6bcf\u4e2a\u5206\u652f\u672b\u7aef\u90fd\u662f\u4e00\u6b21\u963b\u6297\u4e0d\u8fde\u7eed\uff0c\u53cd\u5c04\u6ce2\u548c\u4e3b\u4fe1\u53f7\u53e0\u52a0\u5728\u4e00\u8d77\uff0c\u63a5\u6536\u7aef\u770b\u5230\u7684\u662f\u4e00\u56e2\u566a\u58f0\u3002\u8bbe\u5907\u8d8a\u591a\u3001\u5206\u652f\u8d8a\u957f\u3001\u6ce2\u7279\u7387\u8d8a\u9ad8\uff0c\u661f\u5f62\u8fde\u63a5\u7684\u5371\u5bb3\u8d8a\u5927\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">2.3 \u73b0\u573a\u4e07\u4e0d\u5f97\u5df2\u7684\u5206\u652f\u5bf9\u7b56<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u73b0\u573a\u8bbe\u5907\u7269\u7406\u4f4d\u7f6e\u786e\u5b9e\u65e0\u6cd5\u624b\u62c9\u624b\uff08\u6bd4\u5982\u4e00\u6392\u8bbe\u5907\u88c5\u5728\u4e00\u9762\u5899\u4e0a\u3001\u53e6\u4e00\u9762\u5899\u8fd8\u6709\u8bbe\u5907\uff09\uff0c\u4e0d\u786c\u8d70\u661f\u5f62\u2014\u2014\u7528\u4e00\u4e2a RS-485 \u5206\u914d\u5668\uff08\u4e5f\u53eb\u96c6\u7ebf\u5668\uff09\u628a\u4e3b\u5e72\u5206\u6210\u591a\u4e2a\u72ec\u7acb\u7f51\u6bb5\uff0c\u6bcf\u4e2a\u7f51\u6bb5\u5185\u90e8\u4f9d\u7136\u662f\u6807\u51c6\u7684\u624b\u62c9\u624b\u62d3\u6251\u3002RS-485 \u5206\u914d\u5668\u672c\u8d28\u4e0a\u662f\u591a\u53e3\u4e2d\u7ee7\u5668\uff0c\u6bcf\u4e2a\u7aef\u53e3\u6709\u72ec\u7acb\u7684\u9a71\u52a8\u548c\u63a5\u6536\u7535\u8def\uff0c\u4ee3\u66ff\u4e86\u7b80\u5355\u7684\u94dc\u7ebf\u5206\u652f\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u7ebf\u7f06\u9009\u578b\uff1a\u4e00\u6761\u7ebf\u9009\u9519\uff0c\u5168\u76d8\u7686\u8f93<\/h2>\n\n\n<h3 class=\"wp-block-heading\">3.1 \u5fc5\u987b\u7528\u5c4f\u853d\u53cc\u7ede\u7ebf\uff08RVSP\uff09<\/h3>\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u4f9d\u8d56\u5dee\u5206\u4fe1\u53f7\u6765\u6291\u5236\u5171\u6a21\u5e72\u6270\u2014\u2014\u5e72\u6270\u4fe1\u53f7\u5728 A \u548c B \u4e24\u6839\u7ebf\u4e0a\u7684\u611f\u5e94\u7535\u538b\u51e0\u4e4e\u76f8\u540c\uff0c\u63a5\u6536\u7aef\u505a\u5dee\u5206\u51cf\u6cd5\u65f6\u81ea\u7136\u62b5\u6d88\u3002\u53cc\u7ede\u7ebf\u80fd\u4fdd\u8bc1 A \u548c B \u4e24\u6839\u7ebf\u8026\u5408\u7684\u5e72\u6270\u5c3d\u53ef\u80fd\u76f8\u540c\uff0c\u7ede\u8ddd\u8d8a\u5747\u5300\u3001\u7ede\u5408\u8d8a\u7d27\uff0c\u6297\u5e72\u6270\u6548\u679c\u8d8a\u597d\u3002<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u7ebf\u7f06\u7c7b\u578b<\/th><th>\u662f\u5426\u53ef\u7528<\/th><th>\u539f\u56e0<\/th><\/tr><\/thead><tbody><tr><td>RVSP\uff08\u5c4f\u853d\u53cc\u7ede\u7ebf\uff0c\u7279\u6027\u963b\u6297 120\u03a9\uff09<\/td><td>\u6700\u4f73\u9009\u62e9<\/td><td>\u4e13\u4e3a RS-485 \u8bbe\u8ba1<\/td><\/tr><tr><td>RVV\uff08\u666e\u901a\u62a4\u5957\u5e73\u884c\u7ebf\uff09<\/td><td>\u4e0d\u53ef\u7528<\/td><td>\u4e0d\u662f\u53cc\u7ede\uff0c\u5e72\u6270\u8026\u5408\u4e0d\u5e73\u8861<\/td><\/tr><tr><td>\u7f51\u7ebf\uff08Cat5e\/6 UTP\uff09<\/td><td>\u4e0d\u63a8\u8350<\/td><td>\u867d\u7136\u662f\u53cc\u7ede\u7ebf\u4f46\u7279\u6027\u963b\u6297 100\u03a9\uff0c\u4e14\u65e0\u603b\u5c4f\u853d<\/td><\/tr><tr><td>\u540c\u8f74\u7535\u7f06<\/td><td>\u4e0d\u53ef\u7528<\/td><td>\u5355\u7aef\u4fe1\u53f7\uff0c\u548c\u5dee\u5206\u5b8c\u5168\u4e0d\u662f\u4e00\u4e2a\u6982\u5ff5<\/td><\/tr><tr><td>\u666e\u901a BV \u7ebf\uff08\u5355\u82af\u786c\u7ebf\uff09<\/td><td>\u4e0d\u53ef\u7528<\/td><td>\u6ca1\u6709\u53cc\u7ede\u3001\u6ca1\u6709\u5dee\u5206\uff0c\u7b49\u540c\u4e8e\u4e24\u6839\u5929\u7ebf<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p class=\"wp-block-paragraph\">\u7ebf\u5f84\u8981\u6c42\uff1a0.75mm\u00b2 \u6216 1.0mm\u00b2\uff08\u7ea6 AWG18-20\uff09\u30020.5mm\u00b2 \u53ea\u80fd\u5728 300 \u7c73\u4ee5\u5185\u7684\u7406\u60f3\u73af\u5883\u4e2d\u8dd1\uff0c\u957f\u8ddd\u79bb\u6216\u5e72\u6270\u5f3a\u7684\u73b0\u573a\u5fc5\u987b\u7528 0.75mm\u00b2 \u4ee5\u4e0a\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u7279\u6027\u963b\u6297\u8981\u6c42\uff1a120\u03a9\u3002\u8fd9\u548c\u4f60\u7ec8\u7aef\u7535\u963b\u7684 120\u03a9 \u5339\u914d\uff0c\u4e0d\u80fd\u968f\u4fbf\u62ff 100\u03a9 \u7684\u7f51\u7ebf\u4ee3\u66ff\u2014\u2014\u963b\u6297\u4e0d\u5339\u914d\u610f\u5473\u7740\u6bcf\u4e00\u6bb5\u7535\u7f06\u8fc7\u6e21\u5904\u90fd\u4f1a\u53cd\u5c04\u4fe1\u53f7\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">3.2 \u73b0\u573a\u5e38\u89c1\u7684\u91ce\u8def\u5b50<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u300c\u62ff\u4e00\u6839\u7f51\u7ebf\u5206\u51fa\u4e24\u82af\u5f53 485 \u7ebf\u4f7f\u300d\u2014\u2014\u7f51\u7ebf\u662f UTP\uff08\u975e\u5c4f\u853d\uff09\uff0c\u800c\u4e14\u7f51\u7ebf 8 \u82af\u5185\u90e8\u56db\u5bf9\u53cc\u7ede\uff0c\u4f60\u53ea\u53d6\u5176\u4e2d\u4e00\u5bf9\u7528\uff0c\u5269\u4e0b\u7684 6 \u82af\u6d6e\u7a7a\u5c31\u662f 6 \u6839\u5929\u7ebf\uff0c\u7ed9\u53cc\u7ede\u7ebf\u7684\u5e72\u6270\u8026\u5408\u5f15\u5165\u4e86\u5de8\u5927\u7684\u4e0d\u5e73\u8861\u3002\u5982\u679c\u4f60<strong>\u5fc5\u987b<\/strong>\u7528\u7f51\u7ebf\uff08\u73b0\u573a\u53ea\u6709\u7f51\u7ebf\u4e86\uff09\uff0c\u7528\u5c0f\u5200\u628a\u4e0d\u7528\u7684 6 \u82af\u5168\u526a\u6389\u8d34\u5730\uff0c\u53ea\u7559\u4f60\u7528\u7684\u90a3\u4e00\u5bf9\uff0c\u518d\u628a\u8fd9 2 \u82af\u5916\u5957\u6839\u5c4f\u853d\u5c42\u63a5\u5730\u3002\u8fd9\u6bd4\u76f4\u63a5\u7528\u7f51\u7ebf\u5f3a\uff0c\u4f46\u4f9d\u7136\u6bd4\u6b63\u89c4 RVSP \u5dee\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u300c\u628a 485 \u4fe1\u53f7\u7ebf\u548c 220V \u7535\u6e90\u7ed1\u5728\u4e00\u8d77\u7a7f\u540c\u4e00\u6839\u7ba1\u300d\u2014\u2014\u53d8\u9891\u5668\u4e00\u6b21\u4fa7\u7684 PWM \u6ce2\u5f62\u5728\u7535\u6e90\u7ebf\u4e0a\u6fc0\u53d1\u7684\u7535\u78c1\u5e72\u6270\u53ef\u4ee5\u76f4\u63a5\u5e72\u7ffb 485 \u5dee\u5206\u4fe1\u53f7\u7684 200mV \u9608\u503c\u3002485 \u7ebf\u8def\u8ddd\u79bb\u5f3a\u7535\uff08\u7535\u6e90\u7ebf\u3001\u53d8\u9891\u5668\u8f93\u51fa\u7ebf\uff09\u81f3\u5c11\u4fdd\u6301 30cm \u5e73\u884c\u8ddd\u79bb\uff0c\u4ea4\u53c9\u65f6\u5fc5\u987b\u76f4\u89d2\u7a7f\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5c4f\u853d\u5c42\u63a5\u5730\uff1a\u5355\u70b9\u8fd8\u662f\u53cc\u70b9\uff1f<\/h2>\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u91c7\u7528\u7684\u662f\u4f4e\u9891\u5dee\u5206\u4fe1\u53f7\uff08\u5178\u578b\u7684\u6ce2\u7279\u7387\u6700\u9ad8\u4e5f\u5c31 115.2kbps\uff09\uff0c\u5c5e\u4e8e\u4f4e\u9891\u7535\u8def\u3002\u4f4e\u9891\u7535\u8def\u7684\u57fa\u672c\u539f\u5219\uff1a<strong>\u5355\u70b9\u63a5\u5730<\/strong>\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.1 \u89c4\u5219\uff1a\u5c4f\u853d\u5c42\u5355\u70b9\u63a5\u5730<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5c4f\u853d\u5c42\u53ea\u5728\u603b\u7ebf\u7684\u4e00\u7aef\u63a5\u5927\u5730\u3002\u53e6\u4e00\u7aef\u60ac\u7a7a\uff0c\u4e0d\u63a5\u4efb\u4f55\u4e1c\u897f\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4ec0\u4e48\uff1f\u5982\u679c\u4e24\u5934\u90fd\u63a5\u5730\uff0c\u4e24\u4e2a\u5730\u7531\u4e8e\u5404\u81ea\u7684\u63a5\u5730\u7535\u963b\u4e0d\u540c\uff0c\u4f1a\u5728\u5c4f\u853d\u5c42\u4e2d\u4ea7\u751f\u4e00\u4e2a\u73af\u8def\u7535\u6d41\uff08\u5730\u73af\u8def\uff09\u3002\u8fd9\u4e2a\u7535\u6d41\u5728\u5c4f\u853d\u5c42\u4e0a\u6d41\u52a8\u672c\u8eab\u5c31\u662f\u5e72\u6270\u6e90\u2014\u2014\u5b83\u4e0d\u4ec5\u4e0d\u5c4f\u853d\uff0c\u53cd\u800c\u5f80\u4fe1\u53f7\u7ebf\u4e0a\u8026\u5408\u566a\u58f0\u3002\u5355\u70b9\u63a5\u5730\u65a9\u65ad\u4e86\u8fd9\u4e2a\u73af\u8def\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.2 \u63a5\u54ea\u4e00\u7aef\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u4f18\u5148\u5728\u4e3b\u7ad9\u4fa7\uff08PLC\u3001\u4e0a\u4f4d\u673a\u3001\u7f51\u5173\u4fa7\uff09\u63a5\u5730\u3002\u7406\u7531\uff1a\u4e3b\u7ad9\u901a\u5e38\u6709\u66f4\u597d\u7684\u63a5\u5730\u6761\u4ef6\uff08\u6807\u51c6\u914d\u7535\u67dc\u3001\u7b49\u7535\u4f4d\u63a5\u5730\u6392\uff09\uff0c\u73b0\u573a\u8bbe\u5907\u4fa7\u63a5\u5730\u6761\u4ef6\u5dee\uff08\u8bbe\u5907\u5916\u58f3\u63a5\u4e86\u4e2a\u4e0d\u77e5\u9053\u901a\u4e0d\u901a\u7684\u63a5\u5730\u6869\uff09\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e3b\u7ad9\u4fa7\u672c\u8eab\u662f\u6d6e\u5730\u7cfb\u7edf\uff08\u8bbe\u5907\u6ca1\u6709\u63a5\u5730\u7aef\u5b50\uff09\uff0c\u53ef\u4ee5\u628a\u5c4f\u853d\u5c42\u63a5\u5230\u73b0\u573a\u8bbe\u5907\u4fa7\u7684\u9632\u96f7\u63a5\u5730\u6392\u4e0a\u3002\u5173\u952e\u662f\uff1a\u53ea\u63a5\u4e00\u7aef\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.3 \u8d85\u8fc7 50 \u7c73\u600e\u4e48\u529e<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u603b\u7ebf\u957f\u5ea6\u8d85\u8fc7 50 \u7c73\u3001\u73b0\u573a\u7535\u78c1\u73af\u5883\u7279\u522b\u6076\u52a3\uff08\u65c1\u8fb9\u6709\u53d8\u9891\u5668\u3001\u5927\u529f\u7387\u7535\u673a\uff09\uff0c\u5355\u70b9\u63a5\u5730\u53ef\u80fd\u4e0d\u591f\u2014\u2014\u5c4f\u853d\u5c42\u8fc7\u957f\u540e\uff0c\u5355\u70b9\u63a5\u5730\u7684\u6548\u679c\u4f1a\u8870\u51cf\u3002\u8fd9\u65f6\u5019\u91c7\u7528 <strong>\u53cc\u7aef\u63a5\u5730 + \u4e32\u8054\u7535\u963b<\/strong>\uff1a\u5c4f\u853d\u5c42\u7684\u8fdc\u7aef\u4e0d\u662f\u76f4\u63a5\u63a5\u5927\u5730\uff0c\u800c\u662f\u901a\u8fc7\u4e00\u4e2a 100\u03a9 ~ 1k\u03a9 \u7684\u7535\u963b\u63a5\u5927\u5730\u3002\u7535\u963b\u9650\u5236\u4e86\u5730\u73af\u8def\u7684\u7535\u6d41\uff0c\u540c\u65f6\u4fdd\u6301\u4e86\u5c4f\u853d\u5c42\u4e24\u7aef\u7684\u7535\u4f4d\u4e0d\u81f3\u4e8e\u5dee\u592a\u591a\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">4.4 \u4fe1\u53f7\u5730\uff08GND\uff09\u7684\u8fde\u63a5<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u8bb8\u591a RS-485 \u8bbe\u5907\u9664\u4e86 A\u3001B \u7ebf\u8fd8\u6709 GND\uff08\u4fe1\u53f7\u5730\uff09\u7aef\u5b50\u3002\u8fd9\u4e2a GND \u662f\u5426\u8981\u63a5\uff1f<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u6240\u6709\u8bbe\u5907\u90fd\u5728\u540c\u4e00\u5957\u7535\u6e90\u7cfb\u7edf\u4e0a\uff08\u540c\u4e00\u4e2a\u914d\u7535\u67dc\u51fa\u6765\u7684 DC 24V\uff09\uff0c\u53ef\u4ee5\u4e0d\u63a5 GND\u2014\u2014\u5404\u8bbe\u5907\u7684 GND \u5df2\u7ecf\u7b49\u7535\u4f4d\u4e86\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u8bbe\u5907\u7528\u72ec\u7acb\u7535\u6e90\uff08\u5404\u81ea\u4e00\u4e2a\u5f00\u5173\u7535\u6e90\u9002\u914d\u5668\uff09\uff0c\u5fc5\u987b\u628a\u6240\u6709\u8bbe\u5907\u7684 GND \u7aef\u5b50\u4e32\u8d77\u6765\uff08\u6ce8\u610f\uff1a\u662f GND \u4e32\u5728\u4e00\u8d77\uff0c\u4e0d\u662f\u63a5\u5927\u5730\uff09\u3002\u4e0d\u540c\u7535\u6e90\u7684 GND \u4e4b\u95f4\u53ef\u80fd\u6709\u51e0\u4f0f\u751a\u81f3\u51e0\u5341\u4f0f\u7684\u5171\u6a21\u7535\u538b\u5dee\u2014\u2014\u5982\u679c\u8fd9\u4e2a\u5dee\u8d85\u51fa\u4e86 485 \u6536\u53d1\u5668\u7684\u5171\u6a21\u8303\u56f4\uff08\u5178\u578b -7V~+12V\uff09\uff0c\u6536\u53d1\u5668\u4f1a\u70e7\u6bc1\u6216\u8005\u6c38\u8fdc\u8bc6\u522b\u4e0d\u4e86\u4fe1\u53f7\u3002GND \u7ebf\u7684\u4f5c\u7528\u5c31\u662f\u628a\u6240\u6709\u8bbe\u5907\u7684\u53c2\u8003\u5730\u62c9\u5230\u540c\u4e00\u4e2a\u7535\u4f4d\u4e0a\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u7ec8\u7aef\u7535\u963b\uff1a120\u03a9 \u7684\u4e24\u4e2a\u4f4d\u7f6e<\/h2>\n\n\n<h3 class=\"wp-block-heading\">5.1 \u7ec8\u7aef\u7535\u963b\u7684\u4f5c\u7528<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u4fe1\u53f7\u5728\u4f20\u8f93\u7ebf\u4e0a\u7684\u884c\u4e3a\u548c\u6c34\u6ce2\u5728\u7ba1\u9053\u4e2d\u7c7b\u4f3c\u3002\u7ba1\u9053\u7a81\u7136\u5230\u5c3d\u5934\uff0c\u6c34\u6ce2\u4f1a\u5f39\u56de\u6765\u3002RS-485 \u53cc\u7ede\u7ebf\u7684\u7279\u6027\u963b\u6297\u7ea6 120\u03a9\uff0c\u4fe1\u53f7\u8dd1\u5230\u7ebf\u7684\u672b\u7aef\u5982\u679c\u7a81\u7136\u9047\u5230\u9ad8\u963b\u6297\uff08\u5f00\u8def\uff09\uff0c\u80fd\u91cf\u65e0\u5904\u6d88\u8017\uff0c\u5c31\u4f1a\u53cd\u5c04\u56de\u6765\u3002\u53cd\u5c04\u6ce2\u53e0\u52a0\u5728\u539f\u59cb\u4fe1\u53f7\u4e0a\uff0c\u5f62\u6210\u632f\u94c3\u548c\u8fc7\u51b2\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u7ec8\u7aef\u7535\u963b\u5728\u603b\u7ebf\u7684\u4e24\u7aef\u5404\u63a5\u4e00\u4e2a 120\u03a9 \u7535\u963b\u8de8\u63a5\u5728 A\u3001B \u7ebf\u4e0a\uff0c\u4f7f\u7ebf\u7f06\u672b\u7aef\u963b\u6297\u7b49\u4e8e 120\u03a9\u2014\u2014\u548c\u7ebf\u7f06\u7279\u6027\u963b\u6297\u4e00\u81f4\uff0c\u4fe1\u53f7\u5230\u8fbe\u672b\u7aef\u65f6\u88ab\u7535\u963b\u5438\u6536\u80fd\u91cf\uff0c\u4e0d\u53cd\u5c04\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.2 \u63a5\u5728\u54ea\u91cc<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u53ea\u5728\u603b\u7ebf\u7684\u6700\u4e24\u7aef\u8bbe\u5907\u4e0a\u5404\u63a5\u4e00\u4e2a\u3002\u4e2d\u95f4\u8bbe\u5907\u4e0d\u63a5\u3002\u5982\u679c\u63a5\u4e86\u4e09\u4e2a\u4ee5\u4e0a\u7684\u7ec8\u7aef\u7535\u963b\uff0c\u603b\u5e76\u8054\u7535\u963b\u4f1a\u4f4e\u4e8e 120\u03a9\uff0c\u53cd\u800c\u52a0\u91cd 485 \u9a71\u52a8\u5668\u7684\u8d1f\u8f7d\uff0c\u4fe1\u53f7\u5e45\u503c\u88ab\u62c9\u4f4e\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">5.3 \u4ec0\u4e48\u60c5\u51b5\u4e0b\u9700\u8981\u8003\u8651\u4e0d\u63a5\u7ec8\u7aef\u7535\u963b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u77ed\u8ddd\u79bb\uff08&lt; 50 \u7c73\uff09\u3001\u4f4e\u6ce2\u7279\u7387\uff08\u2264 9600\uff09\u3001\u53ea\u6709 2-3 \u53f0\u8bbe\u5907\u3002\u6b64\u65f6\u4fe1\u53f7\u53cd\u5c04\u7684\u80fd\u91cf\u6781\u5c0f\uff0c\u4e0d\u63a5\u7ec8\u7aef\u7535\u963b\u4e5f\u80fd\u6b63\u5e38\u5de5\u4f5c\u3002\u4f46\u8fd9\u9700\u8981\u5b9e\u6d4b\u786e\u5b9a\u2014\u2014\u63a5\u4e86\u4e0d\u4f1a\u6709\u526f\u4f5c\u7528\uff0c\u662f\u4e00\u79cd\u4fdd\u9669\u505a\u6cd5\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6ce2\u7279\u7387 38400 \u4ee5\u4e0a\u6216\u8ddd\u79bb\u8d85\u8fc7 100 \u7c73\uff0c\u7ec8\u7aef\u7535\u963b\u662f\u5fc5\u987b\u7684\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u504f\u7f6e\u7535\u963b\uff1a\u9632\u6b62\u7a7a\u95f2\u65f6\u7684\u566a\u58f0<\/h2>\n\n\n<h3 class=\"wp-block-heading\">6.1 \u95ee\u9898\u80cc\u666f<\/h3>\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u603b\u7ebf\u7a7a\u95f2\u65f6\uff08\u6ca1\u6709\u8bbe\u5907\u5728\u53d1\u9001\u6570\u636e\uff09\uff0cA \u548c B \u7ebf\u7684\u72b6\u6001\u662f\u4e0d\u786e\u5b9a\u7684\u3002\u5982\u679c\u6b64\u65f6\u603b\u7ebf\u662f\u5b8c\u5168\u6d6e\u7a7a\u7684\uff08\u53ea\u6709\u7ec8\u7aef\u7535\u963b\u628a A \u548c B \u62c9\u5728\u4e00\u8d77\uff09\uff0c\u4efb\u4f55\u5fae\u5c0f\u7684\u7535\u78c1\u566a\u58f0\u90fd\u53ef\u80fd\u5728 A-B \u4e4b\u95f4\u4ea7\u751f\u8d85\u8fc7 \u00b1200mV \u7684\u7535\u538b\u6ce2\u52a8\u2014\u2014\u63a5\u6536\u7aef\u770b\u5230\u7684\u5c31\u662f\u672a\u7ecf\u8bf7\u6c42\u7684\u968f\u673a\u5b57\u8282\u3002\u8fd9\u4e2a\u73b0\u8c61\u53eb\u300c\u7a7a\u95f2\u566a\u58f0\u89e6\u53d1\u4e86\u901a\u4fe1\u4e2d\u65ad\u300d\uff0c\u8868\u73b0\u4e3a\u4e3b\u7ad9\u53d1\u4e86\u67e5\u8be2\uff0c\u4ece\u7ad9\u6ca1\u53cd\u5e94\u2014\u2014\u56e0\u4e3a\u4ece\u7ad9\u7684\u4e2d\u65ad\u670d\u52a1\u7a0b\u5e8f\u88ab\u7a7a\u95f2\u968f\u673a\u5b57\u8282\u5360\u6ee1\u4e86 CPU\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">6.2 \u504f\u7f6e\u7535\u963b\u7684\u539f\u7406<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5728\u603b\u7ebf\u4e00\u7aef\u52a0\u4e0a\u62c9\u7535\u963b\uff08A \u5230 +3.3V\/5V\uff09\u548c\u4e0b\u62c9\u7535\u963b\uff08B \u5230 GND\uff09\uff0c\u4f7f\u5f97\u7a7a\u95f2\u65f6 B \u7ebf\u7684\u7535\u538b\u81ea\u52a8\u9ad8\u4e8e A \u7ebf 200mV \u4ee5\u4e0a\u2014\u2014\u603b\u7ebf\u9ed8\u8ba4\u5904\u4e8e\u786e\u5b9a\u7684\u903b\u8f91 1 \u72b6\u6001\uff08\u7a7a\u95f2\u6001\uff09\u3002\u8fd9\u7ec4\u7535\u963b\u53eb\u504f\u7f6e\u7535\u963b\uff08Fail-safe Bias Resistor\uff09\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">6.3 \u8ba1\u7b97\u65b9\u6cd5<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6807\u51c6 485 \u603b\u7ebf\u6709 120\u03a9 \u7ec8\u7aef\u7535\u963b\u4e24\u4e2a\uff08\u5206\u522b\u63a5\u4e24\u7aef\uff09\u3002\u52a0\u4e0a\u504f\u7f6e\u7535\u963b\u540e\uff0c\u7aef\u63a5\u7b49\u6548\u7535\u8def\u53d8\u6210\uff1a\u4e0a\u62c9\u7535\u963b Rpu \u63a5 5V \u2192 120\u03a9 \u7ec8\u7aef\u7535\u963b \u2192 \u4e0b\u62c9\u7535\u963b Rpd \u63a5 GND\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u8981\u6c42\u7a7a\u95f2\u65f6 B &#8211; A \u2265 200mV\uff0c\u8ba1\u7b97\uff1a<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u53d6 Rpu = Rpd = 680\u03a9\uff0c\u7535\u6e90 5V\u2014\u2014<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u7a7a\u95f2\u65f6 A \u70b9\u7535\u538b = 5V \u00d7 (680\u03a9 \/\/ \u4e0b\u7aef120\u03a9\u7684\u4e00\u534a) \/ (680\u03a9 + 680\u03a9 \/\/ R)&#8230;<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u7b80\u5316\u516c\u5f0f\uff1aRpu = Rpd \u2248 5V \/ (V_AB_min \/ Rterm) = 5 \/ (0.2 \/ 60) \u2248 1.5k\u03a9 \u2014\u2014 \u8fd9\u4e2a\u8ba1\u7b97\u592a\u7406\u60f3\u3002\u5b9e\u9645\u5de5\u7a0b\u4e0a\u76f4\u63a5\u7528 680\u03a9 \u6216 560\u03a9 \u5c31\u884c\u3002\u5e38\u89c1\u65b9\u6848\uff1aRpu = Rpd = 680\u03a9\uff0c\u5728\u603b\u7ebf\u4e00\u7aef\u63a5\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u8868\u662f\u5e38\u7528\u504f\u7f6e\u7535\u963b\u503c\u5728 5V \u4f9b\u7535\u4e0b\u7684\u7a7a\u95f2\u7535\u538b\uff1a<\/p>\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u504f\u7f6e\u7535\u963b\u503c (Rpu = Rpd)<\/th><th>\u7a7a\u95f2\u65f6 B &#8211; A \u7535\u538b\uff08\u7ea6\uff09<\/th><th>\u9002\u7528\u573a\u666f<\/th><\/tr><\/thead><tbody><tr><td>1.5k\u03a9<\/td><td>200mV<\/td><td>\u4e34\u754c\u503c\uff0c\u73af\u5883\u5e72\u51c0\u53ef\u7528<\/td><\/tr><tr><td>1k\u03a9<\/td><td>300mV<\/td><td>\u4e00\u822c\u63a8\u8350<\/td><\/tr><tr><td>680\u03a9<\/td><td>430mV<\/td><td>\u6709\u8f7b\u5fae\u5e72\u6270\u7684\u73af\u5883<\/td><\/tr><tr><td>560\u03a9<\/td><td>530mV<\/td><td>\u5e72\u6270\u5f3a\u4f46\u522b\u592a\u5c0f\u7684\u5e95\u7ebf<\/td><\/tr><tr><td>470\u03a9<\/td><td>640mV<\/td><td>\u5f3a\u5e72\u6270\u4f46\u518d\u5c0f\u4f1a\u62c9\u52a8\u7535\u6e90<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<p class=\"wp-block-paragraph\">\u504f\u7f6e\u7535\u963b\u4e0d\u5b9c\u8fc7\u5c0f\u2014\u2014\u592a\u5c0f\u4f1a\u628a 485 \u9a71\u52a8\u5668\u7684\u6709\u6548\u4fe1\u53f7\u5e45\u503c\u62c9\u4f4e\uff0c\u800c\u4e14\u504f\u7f6e\u7535\u6d41\u6d6a\u8d39\u592a\u591a\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5e02\u9762\u4e0a\u5f88\u591a RS-485 \u4e32\u53e3\u5361\u548c\u8f6c\u6362\u5668\uff08\u5982 USB \u8f6c RS-485 \u6a21\u5757\uff09\u5df2\u7ecf\u5728\u7535\u8def\u677f\u4e0a\u5185\u7f6e\u4e86\u504f\u7f6e\u7535\u963b\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\u603b\u7ebf\u8fdc\u7aef\u4e0d\u7528\u518d\u52a0\u504f\u7f6e\u2014\u2014\u4f46<strong>\u8981\u786e\u8ba4<\/strong>\u3002\u7528\u4e07\u7528\u8868\u65ad\u7535\u6d4b A \u5bf9 VCC \u548c B \u5bf9 GND \u7684\u7535\u963b\u503c\uff0c\u5982\u679c\u6d4b\u5230 680\u03a9~1.5k\u03a9 \u8303\u56f4\uff0c\u8bf4\u660e\u6709\u5185\u7f6e\u504f\u7f6e\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u9632\u96f7\u4e0e\u8fc7\u538b\u4fdd\u62a4<\/h2>\n\n\n<p class=\"wp-block-paragraph\">RS-485 \u901a\u4fe1\u7ebf\u53ea\u8981\u8d70\u51fa\u5efa\u7b51\u7269\u3001\u5728\u4e24\u680b\u697c\u4e4b\u95f4\u8dd1\uff0c\u5c31\u5fc5\u987b\u8003\u8651\u6d6a\u6d8c\u4fdd\u62a4\u3002RS-485 \u6536\u53d1\u5668\u7684\u8010\u538b\u901a\u5e38\u5728 \u00b112V~\u00b115V \u5de6\u53f3\uff0c\u4e00\u4e2a\u8fd1\u8ddd\u79bb\u7684\u96f7\u51fb\u611f\u5e94\u80fd\u5e26\u6765\u51e0\u767e\u4f0f\u5230\u51e0\u5343\u4f0f\u7684\u77ac\u95f4\u7535\u538b\u2014\u2014\u76f4\u63a5\u70e7\u6bc1\u6536\u53d1\u5668\u82af\u7247\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">7.1 \u4e09\u7ea7\u9632\u62a4\u65b9\u6848<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6807\u51c6\u7684\u4e09\u7ea7 RS-485 \u6d6a\u6d8c\u9632\u62a4\u662f\uff1a<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7b2c\u4e00\u7ea7<\/strong>\uff1aA\u3001B \u7ebf\u5bf9\u4fdd\u62a4\u5730\uff08PE\uff09\u5404\u63a5\u4e00\u4e2a\u6c14\u4f53\u653e\u7535\u7ba1\uff08GDT\uff09\uff0c\u8010\u538b 90V~150V\uff0c\u6cc4\u653e\u5927\u80fd\u91cf\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7b2c\u4e8c\u7ea7<\/strong>\uff1aA\u3001B \u7ebf\u5bf9 PE \u5404\u63a5\u4e00\u4e2a TVS \u77ac\u6001\u6291\u5236\u4e8c\u6781\u7ba1\uff08\u5982 SMBJ6.5CA\uff0c\u51fb\u7a7f\u7535\u538b 6.5V\uff09\uff0c\u94b3\u4f4d\u5269\u4f59\u7535\u538b\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>\u7b2c\u4e09\u7ea7<\/strong>\uff1aA\u3001B \u7ebf\u5404\u4e32\u8054\u4e00\u4e2a PTC \u81ea\u6062\u590d\u4fdd\u9669\u4e1d\uff08\u5982 50mA-100mA \u7ea7\uff09\uff0c\u9650\u5236\u6301\u7eed\u7535\u6d41\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u4e09\u7ea7\u65b9\u6848\u4e2d\uff0cGDT \u5403\u6389\u6700\u5927\u80fd\u91cf\u3001TVS \u5403\u6389\u5269\u4f59\u5c16\u5cf0\u3001PTC \u9650\u5236\u6301\u7eed\u7535\u6d41\u3002\u5b9e\u9645\u90e8\u7f72\u4e2d\uff0c\u53ef\u4ee5\u5728\u603b\u7ebf\u7684\u5165\u53e3\u5904\uff08\u5efa\u7b51\u7269\u5916\u5899\u7a7f\u7ba1\u5904\uff09\u96c6\u4e2d\u5b89\u88c5\u4e00\u4e2a RS-485 \u9632\u96f7\u6a21\u5757\uff0c\u518d\u628a\u4fe1\u53f7\u6309\u6b63\u5e38\u63a5\u7ebf\u63a5\u5165\u5ba4\u5185\u8bbe\u5907\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">7.2 \u9632\u96f7\u63a5\u5730\u5fc5\u987b\u53ef\u9760<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u9632\u96f7\u5668\u4ef6\u7684\u63a5\u5730\u7aef\u5fc5\u987b\u4f4e\u963b\u6297\u63a5\u5165\u63a5\u5730\u6392\u3002\u9632\u96f7\u63a5\u5730\u6392\u7684\u63a5\u5730\u7535\u963b\u5e94 \u2264 4\u03a9\u3002\u5982\u679c\u9632\u96f7\u5668\u4ef6\u5730\u628a\u6d6a\u6d8c\u7535\u6d41\u5bfc\u5165\u4e86\u4e0d\u5408\u683c\u7684\u5730\u2014\u2014\u90a3\u6d6a\u6d8c\u7535\u6d41\u901a\u8fc7\u5927\u5730\u7684\u9ad8\u963b\u6297\u4f1a\u77ac\u95f4\u62ac\u5347\u6574\u4e2a\u300c\u5730\u7684\u7535\u4f4d\u300d\uff0c\u7136\u540e\u901a\u8fc7\u5171\u5730\u8026\u5408\u628a\u6d6a\u6d8c\u9001\u56de\u901a\u4fe1\u82af\u7247\uff0c\u7b49\u4e8e\u6ca1\u9632\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u8c03\u8bd5\u6d41\u7a0b\uff1a\u4ece\u4e07\u7528\u8868\u5230\u8dd1\u901a<\/h2>\n\n\n<p class=\"wp-block-paragraph\">\u6309\u8fd9\u4e2a\u987a\u5e8f\u6392\u67e5\uff0c\u662f\u6700\u6709\u6548\u7684\uff1a<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u6b65\u9aa4\u4e00\uff1a\u65ad\u7535\u68c0\u67e5<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6240\u6709\u8bbe\u5907\u65ad\u7535\u3002\u7528\u4e07\u7528\u8868\u7535\u963b\u6863\u6d4b A-B \u4e4b\u95f4\u7684\u76f4\u6d41\u7535\u963b\u3002\u5982\u679c\u7ec8\u7aef\u7535\u963b\u63a5\u4e86 120\u03a9\uff0c\u5e94\u8be5\u5728 60\u03a9~120\u03a9 \u4e4b\u95f4\uff08\u53d6\u51b3\u4e8e\u5176\u4ed6\u8bbe\u5907\u7684\u8f93\u5165\u963b\u6297\uff09\u3002\u5982\u679c\u7535\u963b\u662f\u5f00\u8def\u72b6\u6001\uff0c\u8981\u4e48\u7ebf\u65ad\u4e86\uff0c\u8981\u4e48\u7ec8\u7aef\u7535\u963b\u6ca1\u63a5\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6d4b A \u5bf9\u5730\u3001B \u5bf9\u5730\u7684\u7535\u963b\u2014\u2014\u5e94\u8be5\u662f\u9ad8\u963b\uff08\u51e0\u5341 k\u03a9 \u4ee5\u4e0a\uff09\u3002\u5982\u679c\u6d4b\u5230\u77ed\u8def\u6216\u4f4e\u963b\uff0c\u7ebf\u7f06\u6709\u7834\u635f\u78b0\u58f3\u6216\u8bbe\u5907\u7aef\u53e3\u51fb\u7a7f\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u6b65\u9aa4\u4e8c\uff1a\u4e0a\u7535\u68c0\u67e5\u7a7a\u95f2\u7535\u538b<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u6240\u6709\u8bbe\u5907\u4e0a\u7535\uff0c\u4f46\u4e3b\u7ad9\u4e0d\u53d1\u9001\u6570\u636e\uff08\u6216\u628a\u4e3b\u7ad9\u62d4\u6389\uff09\u3002\u7528\u4e07\u7528\u8868\u76f4\u6d41\u7535\u538b\u6863\u6d4b\uff1a<\/p>\n\n\n<ul class=\"wp-block-list\"><li>A \u5bf9 GND\uff1a\u5e94\u5728 1.5V~2.5V \u5de6\u53f3<\/li><li>B \u5bf9 GND\uff1a\u5e94\u5728 2.5V~3.5V \u5de6\u53f3<\/li><li>A-B \u7535\u538b\uff1aB \u5e94\u9ad8\u4e8e A\uff0c\u5dee\u503c\u5728 200mV~600mV \u5de6\u53f3<\/li><\/ul>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c A-B \u7535\u538b\u63a5\u8fd1 0V \u6216\u6781\u5c0f\uff08 B \u7535\u538b\uff09\uff0c\u5f88\u53ef\u80fd\u662f\u504f\u7f6e\u7535\u963b\u63a5\u53cd\u4e86\u6216\u8005 A\/B \u5728\u8bbe\u5907\u7aef\u88ab\u53cd\u63a5\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u6b65\u9aa4\u4e09\uff1a\u5355\u4ece\u7ad9\u901a\u4fe1\u6d4b\u8bd5<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u628a\u603b\u7ebf\u4e0a\u7684\u4ece\u7ad9\u4e00\u4e2a\u4e00\u4e2a\u52a0\u3002\u5148\u53ea\u63a5\u4ece\u7ad9 01\uff0c\u4e3b\u7ad9\u53d1\u4e00\u4e2a\u8bfb\u4fdd\u6301\u5bc4\u5b58\u5668\u7684\u547d\u4ee4\uff08\u529f\u80fd\u7801 03\uff0c\u8bfb\u4e00\u4e2a\u5bc4\u5b58\u5668\uff09\u3002\u6709\u56de\u5e94\u2192\u8fd9\u53f0\u7684\u63a5\u7ebf\u548c\u53c2\u6570\u6ca1\u9519\u3002\u6ca1\u56de\u5e94\u2192\u68c0\u67e5\u4ece\u7ad9\u5730\u5740\u3001\u6ce2\u7279\u7387\u3001\u6570\u636e\u4f4d\/\u505c\u6b62\u4f4d\/\u6821\u9a8c\u4f4d\u7684\u5339\u914d\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u591a\u65b0\u624b\u4ee5\u4e3a\u300c\u8bbe\u5907\u9ed8\u8ba4\u5730\u5740 1\u30019600\u30018N1\u300d\u2014\u2014\u4f46\u4e0d\u540c\u5382\u5546\u7684\u9ed8\u8ba4\u4e0d\u4e00\u6837\u3002\u6709\u7684\u9ed8\u8ba4 1\uff0c\u6709\u7684\u9ed8\u8ba4 247\u3002\u6ce2\u7279\u7387\u53ef\u80fd\u662f 4800\u30019600\u300119200\u3001115200 \u4e2d\u7684\u4efb\u610f\u4e00\u4e2a\u3002\u6821\u9a8c\u4f4d\u53ef\u80fd\u662f\u65e0\u6821\u9a8c\uff08N\uff09\u3001\u5076\u6821\u9a8c\uff08E\uff09\u3001\u5947\u6821\u9a8c\uff08O\uff09\u3002\u8bf4\u660e\u4e66\u4e0a\u5199\u7684\u662f\u300c\u9ed8\u8ba4 9600,8N1\u300d\uff0c\u4f46\u51fa\u5382\u6d4b\u8bd5\u65f6\u5de5\u7a0b\u5e08\u53ef\u80fd\u6539\u6210\u4e86 19200\u2014\u2014\u8fd9\u79cd\u5751\u6ca1\u6709\u6377\u5f84\uff0c\u53ea\u80fd\u5bf9\u7740\u8bf4\u660e\u4e66\u4e00\u4e2a\u4e2a\u53c2\u6570\u68c0\u67e5\u548c\u540c\u6b65\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u6b65\u9aa4\u56db\uff1a\u5168\u8bbe\u5907\u8054\u8c03<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5355\u53f0\u8dd1\u901a\u540e\uff0c\u52a0\u4e0b\u4e00\u53f0\u3002\u52a0\u4e00\u53f0\u6d4b\u4e00\u53f0\u3002\u4e0d\u8981\u4e00\u6b21\u6027\u628a\u6240\u6709\u8bbe\u5907\u6302\u4e0a\u53bb\u518d\u627e\u95ee\u9898\u2014\u2014RS-485 \u7684\u6545\u969c\u5f80\u5f80\u662f\u67d0\u4e00\u53f0\u8bbe\u5907\u6545\u969c\u628a\u6574\u6761\u603b\u7ebf\u62d6\u57ae\u4e86\uff0c\u4f46\u5982\u679c\u5341\u516d\u53f0\u5168\u6302\u7740\uff0c\u4f60\u6839\u672c\u4e0d\u77e5\u9053\u662f\u8c01\u5e72\u7684\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u52a0\u5230\u67d0\u53f0\u540e\u901a\u4fe1\u7a81\u7136\u51fa\u95ee\u9898\uff0c\u5148\u628a\u5b83\u62d4\u6389\u770b\u603b\u7ebf\u662f\u5426\u6062\u590d\u3002\u6062\u590d\u2192\u8fd9\u53f0\u8bbe\u5907\u6709\u95ee\u9898\uff08\u7aef\u53e3\u635f\u574f\u3001\u6ce2\u7279\u7387\u4e0d\u5339\u914d\u3001\u5730\u5740\u51b2\u7a81\uff09\u3002\u4e0d\u6062\u590d\u2192\u68c0\u67e5\u524d\u9762\u51e0\u53f0\u7684\u63a5\u7ebf\u3001\u7ec8\u7aef\u7535\u963b\u3001\u4f9b\u7535\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">\u6b65\u9aa4\u4e94\uff1a\u793a\u6ce2\u5668\u770b\u6ce2\u5f62<\/h3>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u4e07\u7528\u8868\u6ca1\u67e5\u51fa\u95ee\u9898\u4f46\u8fd8\u662f\u901a\u4fe1\u4e0d\u6b63\u5e38\uff0c\u793a\u6ce2\u5668\u662f\u6700\u7ec8\u6b66\u5668\u3002\u5c06\u793a\u6ce2\u5668\u63a2\u5934\uff08\u5dee\u5206\u63a2\u5934\u6700\u597d\uff0c\u6ca1\u6709\u7684\u8bdd\u7528\u4e24\u4e2a\u5355\u7aef\u63a2\u5934\u505a A-B \u8fd0\u7b97\uff09\u8de8\u63a5\u5728 A\/B \u7ebf\u4e0a\uff0c\u89e6\u53d1\u4e3b\u7ad9\u53d1\u9001\u4e00\u5e27 Modbus \u547d\u4ee4\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u6b63\u5e38\u6ce2\u5f62\u5e94\u8be5\u770b\u5230\uff1a\u7a7a\u95f2\u65f6 B \u9ad8\u4e8e A\uff08\u903b\u8f91 1\uff09\u3002\u5f00\u59cb\u53d1\u9001\u65f6\u51fa\u73b0\u6e05\u6670\u7684\u65b9\u6ce2\u2014\u2014\u4f4e\u7535\u5e73\uff08B <A> A\uff09\u662f\u903b\u8f91 1\u3002\u65b9\u6ce2\u7684\u4e0a\u5347\/\u4e0b\u964d\u6cbf\u5e94\u8be5\u5e72\u51c0\u5229\u843d\uff0c\u6ca1\u6709\u660e\u663e\u7684\u8fc7\u51b2\u548c\u632f\u94c3\u3002\u5e27\u95f4\u9699\uff083.5 \u5b57\u7b26\u65f6\u95f4\uff09\u5728\u793a\u6ce2\u5668\u4e0a\u662f\u4e00\u6bb5\u660e\u663e\u7684\u7a7a\u95f2\u9ad8\u7535\u5e73\u533a\u57df\u3002<\/p>\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u770b\u5230\u4e25\u91cd\u7684\u632f\u94c3\uff08\u65b9\u6ce2\u9876\u90e8\u6709\u591a\u6761\u6ce2\u6d6a\u7ebf\uff09\uff0c\u7ec8\u7aef\u7535\u963b\u9009\u503c\u4e0d\u5bf9\u6216\u8005\u6ca1\u63a5\u3002\u5982\u679c\u7a7a\u95f2\u65f6\u7535\u538b\u4e00\u76f4\u5728\u6296\u52a8\u4e14\u5e45\u5ea6\u8d85\u8fc7 \u00b1200mV\uff0c\u504f\u7f6e\u4e0d\u591f\u6216\u7535\u7f06\u5c4f\u853d\u672a\u63a5\u5730\u3002\u5982\u679c A-B \u7535\u538b\u603b\u662f\u6bd4\u6b63\u5e38\u4f4e\u4e0d\u5c11\uff08\u6bd4\u5982\u6446\u5e45\u53ea\u6709 1V \u800c\u4e0d\u662f 3-5V\uff09\uff0c\u9a71\u52a8\u5668\u8d1f\u8f7d\u8fc7\u91cd\uff08\u7ec8\u7aef\u7535\u963b\u5e76\u8054\u8fc7\u591a\u3001\u8bbe\u5907\u6570\u91cf\u8d85\u51fa\u82af\u7247\u9a71\u52a8\u80fd\u529b\u3001\u6216\u67d0\u4e2a\u8bbe\u5907\u7aef\u53e3\u574f\u4e86\uff09\u3002<\/p>\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n<h2 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