"# \u4ec0\u4e48\u662fRS-485\uff1fModbus\u901a\u8baf\u534f\u8bae\u8981\u70b9\u7b2c1\u90e8\u5206\n\n> 2023-10-02 | 2023-10-02\n> https:\/\/www.modbus.cn\/en\/25151.html\n\n**Modbus \u534f\u8bae\u6807\u51c6**\n\n---\n\nRS-485\u662f\u7f8e\u56fd\u7535\u5b50\u5de5\u4e1a\u534f\u4f1a\uff08EIA\uff09\u57281983\u5e74\u6279\u51c6\u7684\u4e00\u79cd\u4fe1\u53f7\u4f20\u8f93\u6807\u51c6\uff0c\u5b83\u53ea\u662f\u4e00\u4e2a\u7535\u6c14\u7684\u6807\u51c6\uff0c\u4e0d\u6d89\u53ca\u4e0a\u5c42\u534f\u8bae\u7684\u89c4\u5b9a\uff0c\u4ec5\u4ec5\u662f\u63a5\u53e3\u7684\u7269\u7406\u5c42\u89c4\u5b9a\u3002\n\n## **1\u3001RS-485\u7684\u7279\u6027**\u00a0\n\n1\uff09\u91c7\u7528\u5dee\u5206\u4fe1\u53f7\u8fdb\u884c\u4f20\u8f93\uff0c\u589e\u52a0\u4e86\u6297\u566a\u58f0\u80fd\u529b\uff0c\u51cf\u5c11\u566a\u58f0\u8f90\u5c04\u5e26\u6765\u7684\u5e72\u6270\uff1b\n\n2\uff09\u652f\u6301\u957f\u8ddd\u79bb\u4f20\u8f93\uff0c\u6700\u957f\u53ef\u4ee5\u8fbe\u52304000\u82f1\u5c3a\uff08\u7ea61219\u7c73\uff09\uff1b\n\n3\uff09\u4f20\u8f93\u901f\u7387\u8f83\u9ad8\uff0c\u572840\u82f1\u5c3a\u5185\uff0c\u901f\u7387\u53ef\u9ad8\u8fbe10Mbps\uff1b\n\n4\uff09\u540c\u4e00\u603b\u7ebf\u53ef\u4ee5\u8fde\u63a5\u591a\u4e2a\u9a71\u52a8\u5668\u548c\u63a5\u6536\u5668\uff1b\n\n5\uff09\u5171\u6a21\u7535\u538b\u8303\u56f4\u5927\uff0c\u5141\u8bb8\u7684\u6700\u5927\u5171\u6a21\u7535\u538b\u53ef\u8fbe\u5230 -7V - 12V\uff1b\n\n## **2\u3001RS-485\u5e38\u89c1\u7684\u7535\u8def\u8fde\u63a5\u65b9\u5f0f**\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2023\/10\/20231002215523690.png)\n\n\u4e0a\u56fe\u4f7f\u7528\u7684485\u82af\u7247\u4e3aSP3485\uff0cR0\u4e3a\u53d1\u9001\u5f15\u811a\uff0cDI\u4e3a\u63a5\u6536\u5f15\u811a\uff0cRE\/DE\u4e3a\u6536\u53d1\u63a7\u5236\u5f15\u811a\u3002485\u82af\u7247\u6bcf\u6b21\u53ea\u80fd\u5355\u72ec\u4e00\u4e2a\u65b9\u5411\u4f20\u8f93\u6570\u636e\uff0c\u4e0d\u80fd\u6536\u53d1\u540c\u65f6\u8fdb\u884c\uff0c\u800c\u4e14\u6536\u53d1\u5fc5\u987b\u8981\u63a7\u5236\u6536\u53d1\u5f15\u811a\u7684\u7535\u5e73\u72b6\u6001\u624d\u80fd\u5b9e\u73b0\u6536\u53d1\u7684\u529f\u80fd\u3002\n\n## **3\u3001RS-485\u7684\u7535\u5e73\u4fe1\u53f7**\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \n\nRS-485\u91c7\u7528\u7684\u662f\u5dee\u5206\u4fe1\u53f7\u7684\u65b9\u5f0f\u8fdb\u884c\u4f20\u8f93\uff0c\u901a\u8fc7AB\u4e24\u6839\u7ebf\u7684\u7535\u538b\u5dee\u4f5c\u4e3a\u7535\u5e73\u4fe1\u53f7\uff0c\u5dee\u5206\u4fe1\u53f7\u5bf9\u5916\u754c\u56e0\u7d20\u7684\u5e72\u6270\u53cd\u6620\u5230\u4e24\u6839\u7ebf\u4e0a\u5f71\u54cd\u662f\u4e00\u6837\u7684\uff0c\u4e24\u6839\u7ebf\u7684\u7535\u538b\u5dee\u4e0d\u53d8\uff0c\u4fe1\u53f7\u4f20\u9012\u4e5f\u5c31\u4e0d\u4f1a\u53d7\u5e72\u6270\uff0c\u56e0\u6b64\u4f1a\u6709\u66f4\u5f3a\u7684\u6297\u566a\u58f0\u5e72\u6270\u80fd\u529b\u3002\n\n    RS-485\u5dee\u5206\u7ebf\u8def\u5305\u62ec\u4ee5\u4e0b2\u4e2a\u4fe1\u53f7\uff1a\n\n    A\uff1a\u975e\u53cd\u5411\uff08non-inverting\uff09\u4fe1\u53f7\n\n    B\uff1a\u53cd\u5411\uff08inverting\uff09\u4fe1\u53f7\n\n   ** \u903b\u8f911\uff1a**\u7ebf\u8defB\u4fe1\u53f7\u7535\u538b\u6bd4\u7ebf\u8defA\u9ad8\u3002\u4e00\u822c +2V ~ +6V\u3002\n\n\u00a0\u00a0\u00a0**\u00a0\u903b\u8f910\uff1a**\u7ebf\u8defA\u4fe1\u53f7\u7535\u538b\u6bd4\u7ebf\u8defB\u9ad8\u3002\u4e00\u822c -2V ~ -6V\u3002\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n\n\u6839\u636eRS485\u603b\u7ebf\u7684\u76f8\u5173\u6807\u51c6\uff0c\u5f53RS485\u603b\u7ebf\u5dee\u5206\u7535\u538b\u5927\u4e8e+200mV\u65f6\uff0cRS485\u6536\u53d1\u5668\u8f93\u51fa\u9ad8\u7535\u5e73\uff1b\u5f53RS485\u603b\u7ebf\u5dee\u5206\u7535\u538b\u5c0f\u4e8e-200mV\u65f6\uff0cRS485\u6536\u53d1\u5668\u8f93\u51fa\u4f4e\u7535\u5e73\uff1b\u5f53RS485\u603b\u7ebf\u4e0a\u7684\u7535\u538b\u5728-200mV\uff5e+200mV\u4e4b\u95f4\u65f6\uff0cRS485\u6536\u53d1\u5668\u53ef\u80fd\u8f93\u51fa\u9ad8\u7535\u5e73\u4e5f\u53ef\u80fd\u8f93\u51fa\u4f4e\u7535\u5e73\u3002\u56e0\u6b64\uff0c\u4e3a\u4e86\u9632\u6b62RS-485\u603b\u7ebf\u4e0a\u7684\u5dee\u5206\u7535\u538b\u5904\u4e8e-200mV\uff5e+200mV\u4e4b\u95f4\uff0c\u5c31\u9700\u8981\u5229\u7528\u4e0a\u62c9\u4e0b\u62c9\u7535\u963b\u6765\u94b3\u4f4d\u603b\u7ebf\u4e0a\u7535\u538b\u5dee\u503c\u3002\u4e0a\u4e0b\u62c9\u7535\u963b\u7684\u963b\u6b62\u4e00\u822c\u9009\u75284.7K\uff0c\u5b9e\u9645\u9700\u8981\u591a\u5927\u7684\u7535\u963b\uff0c\u9700\u8981\u6839\u636e\u5b9e\u9645\u7ebf\u8def\u8d1f\u8f7d\u548c\u7535\u8def\u60c5\u51b5\u8ba1\u7b97\u9009\u503c\u3002\n\n## **4\u3001RS-485\u603b\u7ebf\u4e0a\u7684\u6536\u53d1\u5668\u6570\u91cf**\n\nRS-485\u603b\u7ebf\u4e0a\u53ef\u4ee5\u5e26\u7684\u53d1\u5c04\u5668\u548c\u63a5\u6536\u5668\u7684\u6700\u5927\u6570\u91cf\u662f\u548c\u8d1f\u8f7d\u7279\u6027\u6709\u5173\u7684\u3002\u6839\u636e485\u7684\u89c4\u5b9a\u6587\u4ef6\u4e2d\u7684\u8bf4\u660e\uff0c\u4e00\u6839\u4f20\u8f93\u603b\u7ebf\u4e0a\u6700\u591a\u53ef\u4ee5\u6302\u8f7d128\u4e2a\u6536\u53d1\u5668\u3002\n\n## **5\u3001RS-485\u603b\u7ebf\u7684\u5de5\u4f5c\u65b9\u5f0f**\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \n\nRS-485\u603b\u7ebf\u53ef\u4ee5\u8bbe\u8ba1\u6210\u4e24\u79cd\u901a\u4fe1\u65b9\u5f0f\uff1a\u534a\u53cc\u5de5\u4e0e\u5168\u53cc\u5de5\u3002\n\n**1\uff09\u534a\u53cc\u5de5**\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n\n\u53ea\u5141\u8bb8\u6570\u636e\u5728\u603b\u7ebf\u4e0a\u5355\u5411\u7684\u4f20\u8f93\uff0c\u5373\u6bcf\u6b21\u6536\u53d1\u53ea\u80fd\u6709\u5176\u4e2d\u4e00\u4e2a\u3002\u534a\u53cc\u5de5\u603b\u7ebf\u7684\u8fde\u63a5\u65b9\u5f0f\u5982\u4e0b\uff1a\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2023\/10\/20231002215640499.png)\n\n**2\uff09\u5168\u53cc\u5de5**\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\n\n\u5141\u8bb8\u6570\u636e\u5728\u603b\u7ebf\u4e0a\u53cc\u5411\u7684\u4f20\u8f93\uff0c\u5373\u6bcf\u6b21\u6536\u53d1\u80fd\u540c\u65f6\u8fdb\u884c\u3002\u5168\u53cc\u5de5\u603b\u7ebf\u7684\u8fde\u63a5\u65b9\u5f0f\u5982\u4e0b\uff1a\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2023\/10\/20231002215728793.png)\n\n## **6\u3001RS-485\u7684\u603b\u7ebf\u7ec8\u7aef\u7535\u963b**\n\n\u4e3a\u907f\u514d\u4fe1\u53f7\u53cd\u5c04\uff0c\u5f53\u901a\u4fe1\u7ebf\u8def\u957f\u5ea6\u5f88\u957f\u65f6\u6570\u636e\u4f20\u8f93\u7ebf\u5fc5\u987b\u6709\u7ec8\u70b9\uff0c\u5e76\u4e14\u5206\u652f\u957f\u5ea6\u5c3d\u53ef\u80fd\u7684\u77ed\u3002\u6b63\u786e\u7684\u901a\u4fe1\u7ebf\u8def\u7ec8\u7aef\u9700\u8981\u7ec8\u7aef\u7535\u963bRT\u5339\u914d\uff0cRS-485\u6807\u51c6\u5efa\u8bae\u7ebf\u7f06\u7684\u00a0**Z0=120\u03a9**\u3002\u901a\u4fe1\u7ebf\u8def\u901a\u5e38\u7ec8\u7aef\u5339\u914d120\u03a9\u7684\u7535\u963b\uff0c\u7ebf\u7f06\u7684\u672b\u5c3e\u5904\u5404\u4e00\u4e2a\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff1a\n\n![](https:\/\/image.modbus.cn\/wp-content\/uploads\/2023\/10\/20231002215754144.png)\n\n---\n*modbus.cn*\n"