"# RS-485\u603b\u7ebf\u4f18\u5316\u6307\u5357\uff1a\u89e3\u51b3\u4e0d\u540c\u8bbe\u5907\u901a\u8baf\u4e2d\u7684\u7535\u5e73\u4e0d\u7a33\u5b9a\u95ee\u9898\n\n> 2024-02-20 | 2024-05-07\n> https:\/\/www.modbus.cn\/en\/26605.html\n\n**Modbus\u76f8\u5173\u6587\u7ae0**\n\n---\n\nRS-485\u603b\u7ebf\u5e94\u7528\u4e2d\uff0c\u65f6\u5e38\u4f1a\u9047\u5230\u4e0d\u540c\u7684RS-485\u8bbe\u5907\u4e4b\u95f4\u901a\u8baf\uff0c\u4e0d\u540c\u7684\u8bbe\u5907\u95f4\u517c\u5bb9\u6027\u5b58\u5728\u4e0d\u540c\uff0c\u6709\u7684\u8bbe\u5907\u5f88\u7a33\u5b9a\uff0c\u6709\u7684\u8bbe\u5907\u5374\u65f6\u5e38\u6536\u5230\u5f02\u5e38\u6570\u636e\uff0c\u8fd9\u662f\u4ec0\u4e48\u539f\u56e0\u5bfc\u81f4\u7684\u5462\uff1f\u53c8\u5e94\u5982\u4f55\u907f\u514d\u5462\uff1f\n\n## RS-485\u5e94\u7528\u5f02\u5e38\n\n\u67d0\u50a8\u80fd\u5ba2\u6237\u5728\u4f7f\u7528ZLG\u7684\u5168\u9694\u79bbRS-485\u6536\u53d1\u82af\u7247SM4500\u8fc7\u7a0b\u4e2d\uff0c\u65f6\u5e38\u4f1a\u51fa\u73b0\u6570\u636e\u4e0d\u7a33\u5b9a\u60c5\u51b5\uff0c\u5982\u4e0b\u56fe 1\uff0c\u5ba2\u6237\u8bbe\u5907\u4e0e\u4e0d\u540c\u7684RS-485\u8bbe\u5907\u901a\u8baf\u65f6\uff0c\u6709\u7684\u8bbe\u5907\u901a\u8baf\u7a33\u5b9a\uff0c\u6709\u7684\u8bbe\u5907\u5219\u65f6\u4e0d\u65f6\u4f1a\u6536\u5230\u5f02\u5e38\u7535\u5e73\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155326245.jpeg?x-oss-process=image\/resize,m_lfit,w_950,h_650)\n\n\u56fe1 SM4500\u5e94\u7528\u7b80\u56fe\n\u7ecf\u8fc7\u6d4b\u8bd5\u53d1\u73b0\u5ba2\u6237\u677f\u5361RS-485\u901a\u9053\u5728\u7a7a\u95f2\u65f6\uff0c\u603b\u7ebf\u7535\u5e73\u5904\u4e8e0\u7535\u4f4d\u3002\u5982\u56fe 1\u6240\u793a\uff0cRS-485\u6807\u51c6\u89c4\u5b9a\u4e86\u5f53AB\u603b\u7ebf\u95f4\u7535\u5e73\u5904\u4e8e-200mV~+200mV\u65f6\uff0c\u63a5\u6536\u5668\u7aef\uff08RXD\uff09\u4f1a\u63a5\u6536\u5230\u4e0d\u786e\u5b9a\u7535\u5e73\uff08\u4e3a\u89e3\u91ca\u65b9\u4fbf\uff0c\u4e0b\u9762\u7edf\u79f0\u201c\u95e8\u9650\u7535\u5e73\u201d\uff09\u3002\u800c\u4e0d\u540c\u7684RS-485\u8bbe\u5907\uff0c\u95e8\u9650\u7535\u5e73\u5b58\u5728\u4e0d\u540c\uff0cSM4500\u95e8\u9650\u7535\u5e73\u4e3a-10mV ~ -200mV\uff0c\u5f53\u4e0e\u95e8\u9650\u7535\u5e73\u4e3a-200mV ~ +200mV\u7684\u8bbe\u5907\u901a\u8baf\u65f6\uff0c\u5c31\u6709\u53ef\u80fd\u51fa\u73b0\u5f02\u5e38\uff0c\u90a3\u4e48\u5982\u4f55\u907f\u514d\u8fd9\u4e00\u95ee\u9898\u53d1\u751f\uff1f\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155347562.jpeg?x-oss-process=image\/resize,m_lfit,w_950,h_650)\n\n\u56fe2 RS-485 \u63a5\u6536\u7535\u5e73\u793a\u610f\u56fe\n\n\u603b\u7ebf\u7535\u5e73\u4e0d\u786e\u5b9a\u72b6\u6001\u539f\u56e0\n1. \u5c11\u4e0d\u4e86\u7684\u4e0a\u4e0b\u62c9\u7535\u963b\n\u5982\u56fe 3\u3001\u56fe 4\uff0c\u4e3aSM4500\u901a\u8baf\u7684\u603b\u7ebf\u6ce2\u5f62\uff0c\u53d1\u9001\u6570\u636e\u65f6\uff08\u975e\u7a7a\u95f2\u72b6\u6001\uff09\uff0c\u603b\u7ebf\u7535\u5e73\u6700\u5927\u503c\u4e3a3.28V\uff0c\u6700\u5c0f\u503c\u4e3a-2.96V\uff1b\u7a7a\u95f2\u72b6\u6001\u65f6\uff0c\u603b\u7ebf\u7535\u5e73\u6700\u5927\u503c\u4e3a240mV\uff0c\u6700\u5c0f\u503c\u4e3a-160mV\uff0c\u6b64\u65f6\u603b\u7ebf\u5df2\u7ecf\u5904\u4e8e\u4e0d\u786e\u5b9a\u72b6\u6001\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155436315.jpeg?x-oss-process=image\/resize,m_lfit,w_950,h_627)\n\n\u56fe3 SM4500\u975e\u7a7a\u95f2\u65f62Mbps\u603b\u7ebf\u6ce2\u5f62\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155503396.jpeg?x-oss-process=image\/resize,m_lfit,w_950,h_627)\n\n\u56fe4 SM4500\u7a7a\u95f2\u65f6\u603b\u7ebf\u6ce2\u5f62\n\u6839\u636eSM4500\u624b\u518c\u7684\u5178\u578b\u8fde\u63a5\u7535\u8def\u56fe\uff0c\u5728\u603b\u7ebf\u4e0a\u589e\u52a0\u4e0a\u4e0b\u62c9\u7535\u963b\u540e\uff0c\u603b\u7ebf\u7535\u5e73\u88ab\u62c9\u9ad8\uff0c\u6b64\u65f6\u5df2\u7ecf\u8fdc\u5927\u4e8e\u4e0d\u786e\u5b9a\u72b6\u6001\u7535\u538b\uff0c\u5982\u56fe 6\u3002\u53ef\u89c1\u5728RS-485\u5e94\u7528\u8fc7\u7a0b\u4e2d\uff0c\u4e0a\u4e0b\u62c9\u7535\u963b\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155522607.jpeg?x-oss-process=image\/resize,m_lfit,w_950,h_408)\n\n\u56fe5 SM4500\u5178\u578b\u8fde\u63a5\u7535\u8def\u56fe\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155541807.jpeg?x-oss-process=image\/resize,m_lfit,w_950,h_610)\n\n\u56fe6 SM4500\u7a7a\u95f2\u65f6\u6ce2\u5f62\uff08\u8bbe\u7f6e\u4e0a\u4e0b\u62c9\u7535\u963b100k\u03a9\uff09\n2. 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7\u3002\u8fd9\u53c8\u600e\u4e48\u89e3\u51b3\u5462\uff1f\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155559812.jpeg?x-oss-process=image\/resize,m_lfit,w_950,h_602)\n\n\u56fe7 SM4500\u7a7a\u95f2\u65f6\u6ce2\u5f62\uff08\u8bbe\u7f6e\u4e0a\u4e0b\u62c9\u7535\u963b100k\u03a9\u300160\u03a9\u7ec8\u7aef\u7535\u963b\uff09\n\n\u5982\u4f55\u4f7f\u603b\u7ebf\u4e0d\u5904\u4e8e\u95e8\u9650\u7535\u5e73\u5185\n\u6211\u4eec\u5148\u6765\u770b\u4e0b\u4e3a\u4ec0\u4e48\u5728\u63a5\u5165\u7ec8\u7aef\u7535\u963b\u540e\uff0c\u603b\u7ebf\u7535\u5e73\u53c8\u4f1a\u8fdb\u5165\u5230\u4e0d\u786e\u5b9a\u72b6\u6001\u3002SM4500\u603b\u7ebf\u7aef\u8f93\u5165\u963b\u6297\u9ad8\u8fbe\u4e0a\u767ek\u03a9\uff0c\u5728\u8bbe\u7f6e\u7ec8\u7aef\u7535\u963b\u540e\uff0c\u5ffd\u7565\u5185\u963b\u7684\u5f71\u54cd\uff0c\u5047\u8bbe\u603b\u7ebf\u4e0a\u5404\u8282\u70b9\u7684SM4500\u7684\u8f93\u51fa\u7535\u538bVISOOUT\u76f8\u540c\uff0c\u5f97\u5230\u603b\u7ebf\u7a7a\u95f2\u65f6\u7535\u5e73\u8ba1\u7b97\u516c\u5f0f\u5982\u4e0b\uff0c\u901a\u8baf\u7b49\u6548\u793a\u610f\u5982\u56fe 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7\u603b\u7ebf\u7a7a\u95f2\u7535\u538bVAB=VISOOUT*60\u03a9\/(100k\u03a9+100k\u03a9+60\u03a9)\uff0c\u8fd9\u91ccVISOOUT\u53ef\u53d65.1V\uff0c\u53ef\u5f97VAB=1.53mV\uff08\u4e0e\u5b9e\u6d4b\u6ce2\u5f62\u76f8\u7b26\uff09\uff0c\u5904\u4e8eRS-485\u6807\u51c6\u89c4\u5b9a\u7684\u95e8\u9650\u7535\u5e73\u5185\u3002\u901a\u8fc7\u516c\u5f0f\u53d1\u73b0\uff0c\u53ea\u8981\u51cf\u5c0f\u4e0a\u4e0b\u62c9\u7535\u963b\u5c31\u80fd\u63d0\u9ad8\u603b\u7ebf\u7a7a\u95f2\u65f6\u7684\u7535\u5e73\uff0c\u56e0\u6b64\u5f97\u5230\u5982\u4e0b\u516c\u5f0f\uff1a\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2024\/02\/20240220155650564.png?x-oss-process=image\/resize,m_lfit,w_950,h_318)\n\n\u6240\u4ee5\u53ea\u8981\u4e0a\u4e0b\u62c9\u7535\u963b\uff1c735\u03a9\uff0c\u7a7a\u95f2\u65f6\u7684\u603b\u7ebf\u7535\u5e73\u5c31\u80fd\uff1e200mV\u3002\u4f8b\u5982\u53d6R\u4e0a=510\u03a9\u8fdb\u884c\u9a8c\u8bc1\uff0c\u6b64\u65f6\u8ba1\u7b97VAB=283mV,\u5b9e\u6d4b\u603b\u7ebf\u7535\u5e73\u5982\u56fe 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SM4500\u7a7a\u95f2\u65f6\u603b\u7ebf\u6ce2\u5f62\uff08\u8bbe\u7f6e\u4e0a\u4e0b\u62c9\u7535\u963b510\u03a9\u300160\u03a9\u7ec8\u7aef\u7535\u963b\uff09\n\u5982\u56fe 10\uff0cSM4500\u7684\u95e8\u9650\u7535\u5e73\u4e3a-10mV ~ 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SM4500\u771f\u503c\u8868\n\n## \u603b\u7ed3\n\n1.RS-485\u603b\u7ebf\u7f51\u7edc\u4e2d\u8bbe\u7f6e\u4e0a\u4e0b\u62c9\u7535\u963b\u662f\u5fc5\u987b\u7684\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u603b\u7ebf\u7a7a\u95f2\u65f6\u8fdb\u5165\u95e8\u9650\u7535\u5e73\u5185\uff1b\n2.\u5982\u679c\u603b\u7ebf\u8bbe\u7f6e\u7ec8\u7aef\u7535\u963b\uff0c\u6b64\u65f6\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u8c03\u6574\u4e0a\u4e0b\u62c9\u7535\u963b\u5927\u5c0f\uff0c\u5fc5\u8981\u65f6\u9002\u5f53\u52a0\u5927\u7ec8\u7aef\u7535\u963b\uff0c\u4ee5\u907f\u514d\u603b\u7ebf\u7a7a\u95f2\u65f6\u5904\u4e8e\u95e8\u9650\u7535\u5e73\u5185\uff1b\n3.SM4500\u95e8\u9650\u7535\u5e73\u8303\u56f4\u5c0f\uff0c\u603b\u7ebf\u7a7a\u95f2\u65f6\u66f4\u4e0d\u5bb9\u6613\u8fdb\u5165\u95e8\u9650\u7535\u5e73\u5185\uff0c\u517c\u5bb9\u6027\u597d\u3002\n\n---\n*modbus.cn*\n"