![\"\u8be6\u89e3RS-422\u4e0eRS-485\u4e32\u884c\u63a5\u53e3\u6807\u51c6\"](\"http:\/\/6.canyin.cc\/wp-content\/uploads\/2026\/05\/20260516083825-6a082d01edf36.png\")
<\/p>\n\u7531\u4e8eRS-232-C\u63a5\u53e3\u6807\u51c6\u51fa\u73b0\u8f83\u65e9\uff0c\u96be\u514d\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u56db\u70b9\uff1a<\/p>\n
\u63a5\u53e3\u7684\u4fe1\u53f7\u7535\u5e73\u503c\u8f83\u9ad8\uff0c\u6613\u635f\u574f\u63a5\u53e3\u7535\u8def\u7684\u82af\u7247\uff0c\u53c8\u56e0\u4e3a\u4e0eTTL\u7535\u5e73\u4e0d\u517c\u5bb9\u6545\u9700\u4f7f\u7528\u7535\u5e73\u8f6c\u6362\u7535\u8def\u65b9\u80fd\u4e0eTTL\u7535\u8def\u8fde\u63a5\u3002<\/p>\n
\u4f20\u8f93\u901f\u7387\u8f83\u4f4e\uff0c\u5728\u5f02\u6b65\u4f20\u8f93\u65f6\uff0c\u6ce2\u7279\u7387\u4e3a20Kbps\u3002<\/p>\n
\u63a5\u53e3\u4f7f\u7528\u4e00\u6839\u4fe1\u53f7\u7ebf\u548c\u4e00\u6839\u4fe1\u53f7\u8fd4\u56de\u7ebf\u800c\u6784\u6210\u5171\u5730\u7684\u4f20\u8f93\u5f62\u5f0f\uff0c\u8fd9\u79cd\u5171\u5730\u4f20\u8f93\u5bb9\u6613\u4ea7\u751f\u5171\u6a21\u5e72\u6270\uff0c\u6240\u4ee5\u6297\u566a\u58f0\u5e72\u6270\u6027\u5f31\u3002<\/p>\n
\u4f20\u8f93\u8ddd\u79bb\u6709\u9650\uff0c\u6700\u5927\u4f20\u8f93\u8ddd\u79bb\u6807\u51c6\u503c\u4e3a50\u82f1\u5c3a\uff0c\u5b9e\u9645\u4e0a\u4e5f\u53ea\u80fd\u7528\u572850\u7c73\u5de6\u53f3\u3002\u9488\u5bf9RS-232-C\u7684\u4e0d\u8db3\uff0c\u4e8e\u662f\u5c31\u4e0d\u65ad\u51fa\u73b0\u4e86\u4e00\u4e9b\u65b0\u7684\u63a5\u53e3\u6807\u51c6\uff0cRS-485\u5c31\u662f\u5176\u4e2d\u4e4b\u4e00<\/p>\n
\u5b83\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n
1)RS-485\u7684\u7535\u6c14\u7279\u6027\uff1a\u903b\u8f91”1″\u4ee5\u4e24\u7ebf\u95f4\u7684\u7535\u538b\u5dee\u4e3a+(2-6)V\u8868\u793a;\u903b\u8f91”0″\u4ee5\u4e24\u7ebf\u95f4\u7684\u7535\u538b\u5dee\u4e3a-(2-6)V\u8868\u793a\u3002\u63a5\u53e3\u4fe1\u53f7\u7535\u5e73\u6bd4RS-232-C\u964d\u4f4e\u4e86\uff0c\u5c31\u4e0d\u6613\u635f\u574f\u63a5\u53e3\u7535\u8def\u7684\u82af\u7247\uff0c\u4e14\u8be5\u7535\u5e73\u4e0eTTL\u7535\u5e73\u517c\u5bb9\uff0c\u53ef\u65b9\u4fbf\u4e0eTTL\u7535\u8def\u8fde\u63a5\u3002<\/p>\n
2)RS-485\u7684\u6570\u636e\u6700\u9ad8\u4f20\u8f93\u901f\u7387\u4e3a10Mbps<\/p>\n
3)RS-485\u63a5\u53e3\u662f\u91c7\u7528\u5e73\u8861\u9a71\u52a8\u5668\u548c\u5dee\u5206\u63a5\u6536\u5668\u7684\u7ec4\u5408\uff0c\u6297\u5171\u6a21\u5e72\u80fd\u529b\u589e\u5f3a\uff0c\u5373\u6297\u566a\u58f0\u5e72\u6270\u6027\u597d\u3002<\/p>\n
4)RS-485\u63a5\u53e3\u7684\u6700\u5927\u4f20\u8f93\u8ddd\u79bb\u6807\u51c6\u503c\u4e3a4000\u82f1\u5c3a\uff0c\u5b9e\u9645\u4e0a\u53ef\u8fbe3000\u7c73\uff0c\u53e6\u5916RS-232-C\u63a5\u53e3\u5728\u603b\u7ebf\u4e0a\u53ea\u5141\u8bb8\u8fde\u63a51\u4e2a\u6536\u53d1\u5668\uff0c\u5373\u5355\u7ad9\u80fd\u529b\u3002\u800cRS-485\u63a5\u53e3\u5728\u603b\u7ebf\u4e0a\u662f\u5141\u8bb8\u8fde\u63a5\u591a\u8fbe128\u4e2a\u6536\u53d1\u5668\u3002\u5373\u5177\u6709\u591a\u7ad9\u80fd\u529b,\u8fd9\u6837\u7528\u6237\u53ef\u4ee5\u5229\u7528\u5355\u4e00\u7684RS-485\u63a5\u53e3\u65b9\u4fbf\u5730\u5efa\u7acb\u8d77\u8bbe\u5907\u7f51\u7edc\u3002<\/p>\n
5)\u56e0RS-485\u63a5\u53e3\u5177\u6709\u826f\u597d\u7684\u6297\u566a\u58f0\u5e72\u6270\u6027\uff0c\u957f\u7684\u4f20\u8f93\u8ddd\u79bb\u548c\u591a\u7ad9\u80fd\u529b\u7b49\u4e0a\u8ff0\u4f18\u70b9\u5c31\u4f7f\u5176\u6210\u4e3a\u9996\u9009\u7684\u4e32\u884c\u63a5\u53e3\u3002<\/p>\n
\u56e0\u4e3aRS485\u63a5\u53e3\u7ec4\u6210\u7684\u534a\u53cc\u5de5\u7f51\u7edc\uff0c\u4e00\u822c\u53ea\u9700\u4e8c\u6839\u8fde\u7ebf\uff0c\u6240\u4ee5RS485\u63a5\u53e3\u5747\u91c7\u7528\u5c4f\u853d\u53cc\u7ede\u7ebf\u4f20\u8f93\u3002RS485\u63a5\u53e3\u8fde\u63a5\u5668\u91c7\u7528DB-9\u76849\u82af\u63d2\u5934\u5ea7\uff0c\u4e0e\u667a\u80fd\u7ec8\u7aefRS485\u63a5\u53e3\u91c7\u7528DB-9(\u5b54)\uff0c\u4e0e\u952e\u76d8\u8fde\u63a5\u7684\u952e\u76d8\u63a5\u53e3RS485\u91c7\u7528DB-9(\u9488)\u3002<\/p>\n
\u4e8c\u3001RS-422\u4e0eRS-485\u4e32\u884c\u63a5\u53e3\u6807\u51c6<\/p>\n
1\u3001\u5e73\u8861\u4f20\u8f93<\/p>\n
RS-422\u3001RS-485\u4e0eRS-232\u4e0d\u4e00\u6837\uff0c\u6570\u636e\u4fe1\u53f7\u91c7\u7528\u5dee\u5206\u4f20\u8f93\u65b9\u5f0f\uff0c\u4e5f\u79f0\u4f5c\u5e73\u8861\u4f20\u8f93\uff0c\u5b83\u4f7f\u7528\u4e00\u5bf9\u53cc\u7ede\u7ebf\uff0c\u5c06\u5176\u4e2d\u4e00\u7ebf\u5b9a\u4e49\u4e3aA\uff0c\u53e6\u4e00\u7ebf\u5b9a\u4e49\u4e3aB<\/p>\n
\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u53d1\u9001\u9a71\u52a8\u5668A\u3001B\u4e4b\u95f4\u7684\u6b63\u7535\u5e73\u5728+2\uff5e+6V\uff0c\u662f\u4e00\u4e2a\u903b\u8f91\u72b6\u6001\uff0c\u8d1f\u7535\u5e73\u5728-2\uff5e6V\uff0c\u662f\u53e6\u4e00\u4e2a\u903b\u8f91\u72b6\u6001\u3002\u53e6\u6709\u4e00\u4e2a\u4fe1\u53f7\u5730C\uff0c\u5728RS-485\u4e2d\u8fd8\u6709\u4e00”\u4f7f\u80fd”\u7aef\uff0c\u800c\u5728RS-422\u4e2d\u8fd9\u662f\u53ef\u7528\u53ef\u4e0d\u7528\u7684\u3002”\u4f7f\u80fd”\u7aef\u662f\u7528\u4e8e\u63a7\u5236\u53d1\u9001\u9a71\u52a8\u5668\u4e0e\u4f20\u8f93\u7ebf\u7684\u5207\u65ad\u4e0e\u8fde\u63a5\u3002\u5f53”\u4f7f\u80fd”\u7aef\u8d77\u4f5c\u7528\u65f6\uff0c\u53d1\u9001\u9a71\u52a8\u5668\u5904\u4e8e\u9ad8\u963b\u72b6\u6001\uff0c\u79f0\u4f5c”\u7b2c\u4e09\u6001”\uff0c\u5373\u5b83\u662f\u6709\u522b\u4e8e\u903b\u8f91”1″\u4e0e”0″\u7684\u7b2c\u4e09\u6001\u3002\u63a5\u6536\u5668\u4e5f\u4f5c\u4e0e\u53d1\u9001\u7aef\u76f8\u5bf9\u7684\u89c4\u5b9a\uff0c\u6536\u3001\u53d1\u7aef\u901a\u8fc7\u5e73\u8861\u53cc\u7ede\u7ebf\u5c06AA\u4e0eBB\u5bf9\u5e94\u76f8\u8fde\uff0c\u5f53\u5728\u6536\u7aefAB\u4e4b\u95f4\u6709\u5927\u4e8e+200mV\u7684\u7535\u5e73\u65f6\uff0c\u8f93\u51fa\u6b63\u903b\u8f91\u7535\u5e73\uff0c\u5c0f\u4e8e-200mV\u65f6\uff0c\u8f93\u51fa\u8d1f\u903b\u8f91\u7535\u5e73\u3002\u63a5\u6536\u5668\u63a5\u6536\u5e73\u8861\u7ebf\u4e0a\u7684\u7535\u5e73\u8303\u56f4\u901a\u5e38\u5728200mV\u81f36V\u4e4b\u95f4\u3002<\/p>\n
2\u3001RS-422\u7535\u6c14\u89c4\u5b9a<\/p>\n
RS-422\u6807\u51c6\u5168\u79f0\u662f”\u5e73\u8861\u7535\u538b\u6570\u5b57\u63a5\u53e3\u7535\u8def\u7684\u7535\u6c14\u7279\u6027”\uff0c\u5b83\u5b9a\u4e49\u4e86\u63a5\u53e3\u7535\u8def\u7684\u7279\u6027\u3002\u56fe2\u662f\u5178\u578b\u7684RS-422\u56db\u7ebf\u63a5\u53e3\u3002\u5b9e\u9645\u4e0a\u8fd8\u6709\u4e00\u6839\u4fe1\u53f7\u5730\u7ebf\uff0c\u51715\u6839\u7ebf\u3002\u56fe1\u662f\u5176DB9\u8fde\u63a5\u5668\u5f15\u811a\u5b9a\u4e49\u3002<\/p>\n
\u7531\u4e8e\u63a5\u6536\u5668\u91c7\u7528\u9ad8\u8f93\u5165\u963b\u6297\u548c\u53d1\u9001\u9a71\u52a8\u5668\u6bd4RS232\u66f4\u5f3a\u7684\u9a71\u52a8\u80fd\u529b\uff0c\u6545\u5141\u8bb8\u5728\u76f8\u540c\u4f20\u8f93\u7ebf\u4e0a\u8fde\u63a5\u591a\u4e2a\u63a5\u6536\u8282\u70b9\uff0c\u6700\u591a\u53ef\u63a510\u4e2a\u8282\u70b9\u3002\u5373\u4e00\u4e2a\u4e3b\u8bbe\u5907(Master)\uff0c\u5176\u4f59\u4e3a\u4ece\u8bbe\u5907(Salve)\uff0c\u4ece\u8bbe\u5907\u4e4b\u95f4\u4e0d\u80fd\u901a\u4fe1\uff0c\u6240\u4ee5RS-422\u652f\u6301\u70b9\u5bf9\u591a\u7684\u53cc\u5411\u901a\u4fe1\u3002\u63a5\u6536\u5668\u8f93\u5165\u963b\u6297\u4e3a4k\uff0c\u6545\u53d1\u7aef\u6700\u5927\u8d1f\u8f7d\u80fd\u529b\u662f10\u00d74k+100\u03a9(\u7ec8\u63a5\u7535\u963b)\u3002<\/p>\n
RS-422\u56db\u7ebf\u63a5\u53e3\u7531\u4e8e\u91c7\u7528\u5355\u72ec\u7684\u53d1\u9001\u548c\u63a5\u6536\u901a\u9053\uff0c\u56e0\u6b64\u4e0d\u5fc5\u63a7\u5236\u6570\u636e\u65b9\u5411\uff0c\u5404\u88c5\u7f6e\u4e4b\u95f4\u4efb\u4f55\u5fc5\u987b\u7684\u4fe1\u53f7\u4ea4\u6362\u5747\u53ef\u4ee5\u6309\u8f6f\u4ef6\u65b9\u5f0f(XON\/XOFF\u63e1\u624b)\u6216\u786c\u4ef6\u65b9\u5f0f(\u4e00\u5bf9\u5355\u72ec\u7684\u53cc\u7ede\u7ebf)\u5b9e\u73b0\u3002<\/p>\n
RS-422\u7684\u6700\u5927\u4f20\u8f93\u8ddd\u79bb\u4e3a4000\u82f1\u5c3a(\u7ea61219\u7c73)\uff0c\u6700\u5927\u4f20\u8f93\u901f\u7387\u4e3a10Mb\/s\u3002\u5176\u5e73\u8861\u53cc\u7ede\u7ebf\u7684\u957f\u5ea6\u4e0e\u4f20\u8f93\u901f\u7387\u6210\u53cd\u6bd4\uff0c\u5728100kb\/s\u901f\u7387\u4ee5\u4e0b\uff0c\u624d\u53ef\u80fd\u8fbe\u5230\u6700\u5927\u4f20\u8f93\u8ddd\u79bb\u3002\u53ea\u6709\u5728\u5f88\u77ed\u7684\u8ddd\u79bb\u4e0b\u624d\u80fd\u83b7\u5f97\u6700\u9ad8\u901f\u7387\u4f20\u8f93\u3002\u4e00\u822c100\u7c73\u957f\u7684\u53cc\u7ede\u7ebf\u4e0a\u6240\u80fd\u83b7\u5f97\u7684\u6700\u5927\u4f20\u8f93\u901f\u7387\u4ec5\u4e3a1Mb\/s\u3002<\/p>\n
RS-422\u9700\u8981\u4e00\u7ec8\u63a5\u7535\u963b\uff0c\u8981\u6c42\u5176\u963b\u503c\u7ea6\u7b49\u4e8e\u4f20\u8f93\u7535\u7f06\u7684\u7279\u6027\u963b\u6297\u3002\u5728\u77e9\u8ddd\u79bb\u4f20\u8f93\u65f6\u53ef\u4e0d\u9700\u7ec8\u63a5\u7535\u963b\uff0c\u5373\u4e00\u822c\u5728300\u7c73\u4ee5\u4e0b\u4e0d\u9700\u7ec8\u63a5\u7535\u963b\u3002\u7ec8\u63a5\u7535\u963b\u63a5\u5728\u4f20\u8f93\u7535\u7f06\u7684\u6700\u8fdc\u7aef\u3002<\/p>\n
3\u3001RS-485\u7535\u6c14\u89c4\u5b9a<\/p>\n
\u7531\u4e8eRS-485\u662f\u4eceRS-422\u57fa\u7840\u4e0a\u53d1\u5c55\u800c\u6765\u7684\uff0c\u6240\u4ee5RS-485\u8bb8\u591a\u7535\u6c14\u89c4\u5b9a\u4e0eRS-422\u76f8\u4eff\u3002\u5982\u90fd\u91c7\u7528\u5e73\u8861\u4f20\u8f93\u65b9\u5f0f\u3001\u90fd\u9700\u8981\u5728\u4f20\u8f93\u7ebf\u4e0a\u63a5\u7ec8\u63a5\u7535\u963b\u7b49\u3002RS-485\u53ef\u4ee5\u91c7\u7528\u4e8c\u7ebf\u4e0e\u56db\u7ebf\u65b9\u5f0f\uff0c\u4e8c\u7ebf\u5236\u53ef\u5b9e\u73b0\u771f\u6b63\u7684\u591a\u70b9\u53cc\u5411\u901a\u4fe1\u3002<\/p>\n
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1\u3001\u91c7\u7528\u4e00\u6761\u53cc\u7ede\u7ebf\u7535\u7f06\u4f5c\u603b\u7ebf\uff0c\u5c06\u5404\u4e2a\u8282\u70b9\u4e32\u63a5\u8d77\u6765\uff0c\u4ece\u603b\u7ebf\u5230\u6bcf\u4e2a\u8282\u70b9\u7684\u5f15\u51fa\u7ebf\u957f\u5ea6\u5e94\u5c3d\u91cf\u77ed\uff0c\u4ee5\u4fbf\u4f7f\u5f15\u51fa\u7ebf\u4e2d\u7684\u53cd\u5c04\u4fe1\u53f7\u5bf9\u603b\u7ebf\u4fe1\u53f7\u7684\u5f71\u54cd\u6700\u4f4e\u3002<\/p>\n
\u56fe8\u6240\u793a\u4e3a\u5b9e\u9645\u5e94\u7528\u4e2d\u5e38\u89c1\u7684\u4e00\u4e9b\u9519\u8bef\u8fde\u63a5\u65b9\u5f0f(a\uff0cc\uff0ce)\u548c\u6b63\u786e\u7684\u8fde\u63a5\u65b9\u5f0f(b\uff0cd\uff0cf)\u3002a\uff0cc\uff0ce\u8fd9\u4e09\u79cd\u7f51\u7edc\u8fde\u63a5\u5c3d\u7ba1\u4e0d\u6b63\u786e\uff0c\u5728\u77ed\u8ddd\u79bb\u3001\u4f4e\u901f\u7387\u4ecd\u53ef\u80fd\u6b63\u5e38\u5de5\u4f5c\uff0c\u4f46\u968f\u7740\u901a\u4fe1\u8ddd\u79bb\u7684\u5ef6\u957f\u6216\u901a\u4fe1\u901f\u7387\u7684\u63d0\u9ad8\uff0c\u5176\u4e0d\u826f\u5f71\u54cd\u4f1a\u8d8a\u6765\u8d8a\u4e25\u91cd\uff0c\u4e3b\u8981\u539f\u56e0\u662f\u4fe1\u53f7\u5728\u5404\u652f\u8def\u672b\u7aef\u53cd\u5c04\u540e\u4e0e\u539f\u4fe1\u53f7\u53e0\u52a0\uff0c\u4f1a\u9020\u6210\u4fe1\u53f7\u8d28\u91cf\u4e0b\u964d\u3002<\/p>\n
2\u3001\u5e94\u6ce8\u610f\u603b\u7ebf\u7279\u6027\u963b\u6297\u7684\u8fde\u7eed\u6027\uff0c\u5728\u963b\u6297\u4e0d\u8fde\u7eed\u70b9\u5c31\u4f1a\u53d1\u751f\u4fe1\u53f7\u7684\u53cd\u5c04\u3002\u4e0b\u5217\u51e0\u79cd\u60c5\u51b5\u6613\u4ea7\u751f\u8fd9\u79cd\u4e0d\u8fde\u7eed\u6027\uff1a\u603b\u7ebf\u7684\u4e0d\u540c\u533a\u6bb5\u91c7\u7528\u4e86\u4e0d\u540c\u7535\u7f06\uff0c\u6216\u67d0\u4e00\u6bb5\u603b\u7ebf\u4e0a\u6709\u8fc7\u591a\u6536\u53d1\u5668\u7d27\u9760\u5728\u4e00\u8d77\u5b89\u88c5\uff0c\u518d\u8005\u662f\u8fc7\u957f\u7684\u5206\u652f\u7ebf\u5f15\u51fa\u5230\u603b\u7ebf\u3002<\/p>\n
\u603b\u4e4b\uff0c\u5e94\u8be5\u63d0\u4f9b\u4e00\u6761\u5355\u4e00\u3001\u8fde\u7eed\u7684\u4fe1\u53f7\u901a\u9053\u4f5c\u4e3a\u603b\u7ebf\u3002\u56db\u3001RS-422\u4e0eRS-485\u4f20\u8f93\u7ebf\u4e0a\u5339\u914d\u7684\u4e00\u4e9b\u8bf4\u660e\u5bf9RS-422\u4e0eRS-485\u603b\u7ebf\u7f51\u7edc\u4e00\u822c\u8981\u4f7f\u7528\u7ec8\u63a5\u7535\u963b\u8fdb\u884c\u5339\u914d\u3002\u4f46\u5728\u77ed\u8ddd\u79bb\u4e0e\u4f4e\u901f\u7387\u4e0b\u53ef\u4ee5\u4e0d\u7528\u8003\u8651\u7ec8\u7aef\u5339\u914d\u3002<\/p>\n
\u90a3\u4e48\u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4e0d\u7528\u8003\u8651\u5339\u914d\u5462?\u7406\u8bba\u4e0a\uff0c\u5728\u6bcf\u4e2a\u63a5\u6536\u6570\u636e\u4fe1\u53f7\u7684\u4e2d\u70b9\u8fdb\u884c\u91c7\u6837\u65f6\uff0c\u53ea\u8981\u53cd\u5c04\u4fe1\u53f7\u5728\u5f00\u59cb\u91c7\u6837\u65f6\u8870\u51cf\u5230\u8db3\u591f\u4f4e\u5c31\u53ef\u4ee5\u4e0d\u8003\u8651\u5339\u914d\u3002<\/p>\n
\u4f46\u8fd9\u5728\u5b9e\u9645\u4e0a\u96be\u4ee5\u638c\u63e1\uff0c\u7f8e\u56fdMAXIM\u516c\u53f8\u6709\u7bc7\u6587\u7ae0\u63d0\u5230\u4e00\u6761\u7ecf\u9a8c\u6027\u7684\u539f\u5219\u53ef\u4ee5\u7528\u6765\u5224\u65ad\u5728\u4ec0\u4e48\u6837\u7684\u6570\u636e\u901f\u7387\u548c\u7535\u7f06\u957f\u5ea6\u65f6\u9700\u8981\u8fdb\u884c\u5339\u914d\uff1a\u5f53\u4fe1\u53f7\u7684\u8f6c\u6362\u65f6\u95f4(\u4e0a\u5347\u6216\u4e0b\u964d\u65f6\u95f4)\u8d85\u8fc7\u7535\u4fe1\u53f7\u6cbf\u603b\u7ebf\u5355\u5411\u4f20\u8f93\u6240\u9700\u65f6\u95f4\u76843\u500d\u4ee5\u4e0a\u65f6\u5c31\u53ef\u4ee5\u4e0d\u52a0\u5339\u914d\u3002<\/p>\n
\u4f8b\u5982\u5177\u6709\u9650\u659c\u7387\u7279\u6027\u7684RS-485\u63a5\u53e3MAX483\u8f93\u51fa\u4fe1\u53f7\u7684\u4e0a\u5347\u6216\u4e0b\u964d\u65f6\u95f4\u6700\u5c0f\u4e3a250ns\uff0c\u5178\u578b\u53cc\u7ede\u7ebf\u4e0a\u7684\u4fe1\u53f7\u4f20\u8f93\u901f\u7387\u7ea6\u4e3a0.2m\/ns(24AWGPVC\u7535\u7f06)\uff0c\u90a3\u4e48\u53ea\u8981\u6570\u636e\u901f\u7387\u5728250kb\/s\u4ee5\u5185\u3001\u7535\u7f06\u957f\u5ea6\u4e0d\u8d85\u8fc716\u7c73\uff0c\u91c7\u7528MAX483\u4f5c\u4e3aRS-485\u63a5\u53e3\u65f6\u5c31\u53ef\u4ee5\u4e0d\u52a0\u7ec8\u7aef\u5339\u914d\u3002<\/p>\n
\u4e00\u822c\u7ec8\u7aef\u5339\u914d\u91c7\u7528\u7ec8\u63a5\u7535\u963b\u65b9\u6cd5\uff0c\u524d\u6587\u5df2\u6709\u63d0\u53ca\uff0cRS-422\u5728\u603b\u7ebf\u7535\u7f06\u7684\u8fdc\u7aef\u5e76\u63a5\u7535\u963b\uff0cRS-485\u5219\u5e94\u5728\u603b\u7ebf\u7535\u7f06\u7684\u5f00\u59cb\u548c\u672b\u7aef\u90fd\u9700\u5e76\u63a5\u7ec8\u63a5\u7535\u963b\u3002\u7ec8\u63a5\u7535\u963b\u4e00\u822c\u5728RS-422\u7f51\u7edc\u4e2d\u53d6100\u03a9\uff0c\u5728RS-485\u7f51\u7edc\u4e2d\u53d6120\u03a9\u3002<\/p>\n
\u76f8\u5f53\u4e8e\u7535\u7f06\u7279\u6027\u963b\u6297\u7684\u7535\u963b\uff0c\u56e0\u4e3a\u5927\u591a\u6570\u53cc\u7ede\u7ebf\u7535\u7f06\u7279\u6027\u963b\u6297\u5927\u7ea6\u5728100\uff5e120\u03a9\u3002\u8fd9\u79cd\u5339\u914d\u65b9\u6cd5\u7b80\u5355\u6709\u6548\uff0c\u4f46\u6709\u4e00\u4e2a\u7f3a\u70b9\uff0c\u5339\u914d\u7535\u963b\u8981\u6d88\u8017\u8f83\u5927\u529f\u7387\uff0c\u5bf9\u4e8e\u529f\u8017\u9650\u5236\u6bd4\u8f83\u4e25\u683c\u7684\u7cfb\u7edf\u4e0d\u592a\u9002\u5408\u3002\u53e6\u5916\u4e00\u79cd\u6bd4\u8f83\u7701\u7535\u7684\u5339\u914d\u65b9\u5f0f\u662fRC\u5339\u914d\uff0c\u5982\u56fe1\u3002\u5229\u7528\u4e00\u53ea\u7535\u5bb9C\u9694\u65ad\u76f4\u6d41\u6210\u5206\u53ef\u4ee5\u8282\u7701\u5927\u90e8\u5206\u529f\u7387\u3002\u4f46\u7535\u5bb9C\u7684\u53d6\u503c\u662f\u4e2a\u96be\u70b9\uff0c\u9700\u8981\u5728\u529f\u8017\u548c\u5339\u914d\u8d28\u91cf\u95f4\u8fdb\u884c\u6298\u8877\u3002<\/p>\n
\u8fd8\u6709\u4e00\u79cd\u91c7\u7528\u4e8c\u6781\u7ba1\u7684\u5339\u914d\u65b9\u6cd5\uff0c\u5982\u56fe2\u3002\u8fd9\u79cd\u65b9\u6848\u867d\u672a\u5b9e\u73b0\u771f\u6b63\u7684”\u5339\u914d”\uff0c\u4f46\u5b83\u5229\u7528\u4e8c\u6781\u7ba1\u7684\u94b3\u4f4d\u4f5c\u7528\u80fd\u8fc5\u901f\u524a\u5f31\u53cd\u5c04\u4fe1\u53f7\uff0c\u8fbe\u5230\u6539\u5584\u4fe1\u53f7\u8d28\u91cf\u7684\u76ee\u7684\u3002\u8282\u80fd\u6548\u679c\u663e\u8457\u3002\u4e94\u3001RS-422\u4e0eRS-485\u7684\u63a5\u5730\u95ee\u9898\u7535\u5b50\u7cfb\u7edf\u63a5\u5730\u662f\u5f88\u91cd\u8981\u7684\uff0c\u4f46\u5e38\u5e38\u88ab\u5ffd\u89c6\u3002\u63a5\u5730\u5904\u7406\u4e0d\u5f53\u5f80\u5f80\u4f1a\u5bfc\u81f4\u7535\u5b50\u7cfb\u7edf\u4e0d\u80fd\u7a33\u5b9a\u5de5\u4f5c\u751a\u81f3\u5371\u53ca\u7cfb\u7edf\u5b89\u5168\u3002<\/p>\n
RS-422\u4e0eRS-485\u4f20\u8f93\u7f51\u7edc\u7684\u63a5\u5730\u540c\u6837\u4e5f\u662f\u5f88\u91cd\u8981\u7684\uff0c\u56e0\u4e3a\u63a5\u5730\u7cfb\u7edf\u4e0d\u5408\u7406\u4f1a\u5f71\u54cd\u6574\u4e2a\u7f51\u7edc\u7684\u7a33\u5b9a\u6027\uff0c\u5c24\u5176\u662f\u5728\u5de5\u4f5c\u73af\u5883\u6bd4\u8f83\u6076\u52a3\u548c\u4f20\u8f93\u8ddd\u79bb\u8f83\u8fdc\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8e\u63a5\u5730\u7684\u8981\u6c42\u66f4\u4e3a\u4e25\u683c\u3002<\/p>\n
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2\u3001\u65c1\u8def\u4fdd\u62a4\u65b9\u6cd5<\/p>\n
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RS-485\/RS-422\u4e00\u822c\u91c7\u7528\u53cc\u7ede\u7ebf(\u5c4f\u853d\u6216\u975e\u5c4f\u853d)\u8fde\u63a5\uff0c\u7ec8\u7aef\u7535\u963b\u4e00\u822c\u4ecb\u4e8e100\u81f3140\u03a9\u4e4b\u95f4\uff0c\u5178\u578b\u503c\u4e3a120\u03a9\u3002\u5728\u5b9e\u9645\u914d\u7f6e\u65f6\uff0c\u5728\u7535\u7f06\u7684\u4e24\u4e2a\u7ec8\u7aef\u8282\u70b9\u4e0a\uff0c\u5373\u6700\u8fd1\u7aef\u548c\u6700\u8fdc\u7aef\uff0c\u5404\u63a5\u5165\u4e00\u4e2a\u7ec8\u7aef\u7535\u963b\uff0c\u800c\u5904\u4e8e\u4e2d\u95f4\u90e8\u5206\u7684\u8282\u70b9\u5219\u4e0d\u80fd\u63a5\u5165\u7ec8\u7aef\u7535\u963b\uff0c\u5426\u5219\u5c06\u5bfc\u81f4\u901a\u8baf\u51fa\u9519\u3002\u5341\u4e00\u3001RS-485\u7f51\u4e0d\u77e5\u9053\u6700\u8fdc\u7ad9\u70b9\u662f\u54ea\u4e00\u4e2a\uff0c\u5e94\u8be5\u5982\u4f55\u63a5\u5339\u914d\u7535\u963b\u5462?\u7b54\uff1a\u4f1a\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff0c\u662f\u7531\u4e8e\u7528\u6237\u7ec4\u6210RS-485\u7f51\u65f6\uff0c\u6ca1\u6709\u9075\u5faa\u7ad9\u70b9\u81f3\u603b\u7ebf\u7684\u8fde\u7ebf\u5e94\u5c3d\u53ef\u80fd\u77ed\u7684\u539f\u5219\u3002\u5982\u679c\u603b\u7ebf\u5e03\u7ebf\u9075\u5faa\u8fd9\u4e00\u539f\u5219\uff0c\u5c31\u4e0d\u5b58\u5728\u4e0d\u77e5\u9053\u54ea\u4e2a\u7ad9\u70b9\u662f\u6700\u8fdc\u7684\u95ee\u9898\u3002\u800c\u4e14\u8981\u6ce8\u610f\uff0c\u8fd9\u6837\u7684\u5e03\u7ebf\uff0c\u7cfb\u7edf\u5c06\u4f1a\u5de5\u4f5c\u5f97\u4e0d\u597d\u3002\u5341\u4e8c\u3001RS-485\/RS-422\u63a5\u53e3\u4e3a\u4f55\u5728\u505c\u6b62\u901a\u4fe1\u65f6\u63a5\u6536\u5668\u4ecd\u6709\u6570\u636e\u8f93\u51fa?\u7b54\uff1a\u7531\u4e8eRS-485\/RS-422\u5728\u53d1\u9001\u6570\u636e\u5b8c\u6210\u540e\uff0c\u8981\u6c42\u6240\u6709\u7684\u53d1\u9001\u4f7f\u80fd\u63a7\u5236\u4fe1\u53f7\u5173\u95ed\u4e14\u4fdd\u6301\u63a5\u6536\u4f7f\u80fd\u6709\u6548\uff0c\u6b64\u65f6\uff0c\u603b\u7ebf\u9a71\u52a8\u5668\u8fdb\u5165\u9ad8\u963b\u72b6\u6001\u4e14\u63a5\u6536\u5668\u80fd\u591f\u76d1\u6d4b\u603b\u7ebf\u4e0a\u662f\u5426\u6709\u65b0\u7684\u901a\u4fe1\u6570\u636e\u3002<\/p>\n
\u4f46\u662f\u7531\u4e8e\u6b64\u65f6\u603b\u7ebf\u5904\u4e8e\u65e0\u6e90\u9a71\u52a8\u72b6\u6001(\u82e5\u603b\u7ebf\u6709\u7ec8\u7aef\u5339\u914d\u7535\u963b\u65f6\uff0cA\u548cB\u7ebf\u7684\u5dee\u5206\u7535\u5e73\u4e3a0\uff0c\u63a5\u6536\u5668\u7684\u8f93\u51fa\u4e0d\u786e\u5b9a\uff0c\u4e14\u5bf9AB\u7ebf\u4e0a\u7684\u5dee\u5206\u4fe1\u53f7\u7684\u53d8\u5316\u5f88\u654f\u611f;\u82e5\u65e0\u7ec8\u7aef\u5339\u914d\uff0c\u5219\u603b\u7ebf\u5904\u4e8e\u9ad8\u963b\u6001\uff0c\u63a5\u6536\u5668\u7684\u8f93\u51fa\u4e0d\u786e\u5b9a),\u5bb9\u6613\u53d7\u5230\u5916\u754c\u7684\u566a\u58f0\u5e72\u6270\u3002<\/p>\n
\u5f53\u566a\u58f0\u7535\u538b\u8d85\u8fc7\u8f93\u5165\u4fe1\u53f7\u95e8\u9650\u65f6(\u5178\u578b\u503c\u00b1200mV)\uff0c\u63a5\u6536\u5668\u5c06\u8f93\u51fa\u6570\u636e\uff0c\u5bfc\u81f4\u5bf9\u5e94\u7684UART\u63a5\u6536\u65e0\u6548\u7684\u6570\u636e\uff0c\u4f7f\u7d27\u63a5\u7740\u7684\u6b63\u5e38\u901a\u8baf\u51fa\u9519;\u53e6\u5916\u4e00\u79cd\u60c5\u51b5\u53ef\u80fd\u53d1\u751f\u5728\u6253\u5f00\/\u5173\u95ed\u53d1\u9001\u4f7f\u80fd\u63a7\u5236\u7684\u77ac\u95f4\uff0c\u4f7f\u63a5\u6536\u5668\u8f93\u51fa\u4fe1\u53f7\uff0c\u4e5f\u4f1a\u5bfc\u81f4UART\u9519\u8bef\u5730\u63a5\u6536\u3002<\/p>\n
\u89e3\u51b3\u65b9\u6cd5\uff1a<\/p>\n
1)\u5728\u901a\u8baf\u603b\u7ebf\u4e0a\u91c7\u7528\u540c\u76f8\u8f93\u5165\u7aef\u4e0a\u62c9(A\u7ebf)\u3001\u53cd\u76f8\u8f93\u5165\u7aef\u4e0b\u62c9(B\u7ebf)\u7684\u65b9\u6cd5\u5bf9\u603b\u7ebf\u8fdb\u884c\u94b3\u4f4d\uff0c\u4fdd\u8bc1\u63a5\u6536\u5668\u8f93\u51fa\u4e3a\u56fa\u5b9a\u7684”1″\u7535\u5e73;<\/p>\n
2)\u91c7\u7528\u5185\u7f6e\u9632\u6545\u969c\u6a21\u5f0f\u7684MAX308x\u7cfb\u5217\u7684\u63a5\u53e3\u4ea7\u54c1\u66ff\u6362\u8be5\u63a5\u53e3\u7535\u8def;<\/p>\n
3)\u901a\u8fc7\u8f6f\u4ef6\u65b9\u5f0f\u6d88\u9664\uff0c\u5373\u5728\u901a\u4fe1\u6570\u636e\u5305\u5185\u589e\u52a02-5\u4e2a\u8d77\u59cb\u540c\u6b65\u5b57\u8282\uff0c\u53ea\u6709\u5728\u6ee1\u8db3\u540c\u6b65\u5934\u540e\u624d\u5f00\u59cb\u771f\u6b63\u7684\u6570\u636e\u901a\u8baf\u3002<\/p>\n
\u5341\u4e09\u3001\u5f71\u54cdRS-485\u603b\u7ebf\u901a\u8baf\u901f\u5ea6\u548c\u901a\u4fe1\u53ef\u9760\u6027\u7684\u4e09\u4e2a\u56e0\u7d20<\/p>\n
\u5728\u901a\u4fe1\u7535\u7f06\u4e2d\u7684\u4fe1\u53f7\u53cd\u5c04<\/p>\n
\u5728\u901a\u4fe1\u8fc7\u7a0b\u4e2d\uff0c\u6709\u4e24\u79cd\u4fe1\u53f7\u56e0\u5bfc\u81f4\u4fe1\u53f7\u53cd\u5c04\uff1a\u963b\u6297\u4e0d\u8fde\u7eed\u548c\u963b\u6297\u4e0d\u5339\u914d\u3002\u963b\u6297\u4e0d\u8fde\u7eed\uff0c\u4fe1\u53f7\u5728\u4f20\u8f93\u7ebf\u672b\u7aef\u7a81\u7136\u9047\u5230\u7535\u7f06\u963b\u6297\u5f88\u5c0f\u751a\u81f3\u6ca1\u6709\uff0c\u4fe1\u53f7\u5728\u8fd9\u4e2a\u5730\u65b9\u5c31\u4f1a\u5f15\u8d77\u53cd\u5c04\uff0c\u5982\u56fe1\u6240\u793a\u3002<\/p>\n
\u8fd9\u79cd\u4fe1\u53f7\u53cd\u5c04\u7684\u539f\u7406\uff0c\u4e0e\u5149\u4ece\u4e00\u79cd\u5a92\u8d28\u8fdb\u5165\u53e6\u4e00\u79cd\u5a92\u8d28\u8981\u5f15\u8d77\u53cd\u5c04\u662f\u76f8\u4f3c\u7684\u3002\u6d88\u9664\u8fd9\u79cd\u53cd\u5c04\u7684\u65b9\u6cd5\uff0c\u5c31\u5fc5\u987b\u5728\u7535\u7f06\u7684\u672b\u7aef\u8de8\u63a5\u4e00\u4e2a\u4e0e\u7535\u7f06\u7684\u7279\u6027\u963b\u6297\u540c\u6837\u5927\u5c0f\u7684\u7ec8\u7aef\u7535\u963b\uff0c\u4f7f\u7535\u7f06\u7684\u963b\u6297\u8fde\u7eed\u3002<\/p>\n
\u7531\u4e8e\u4fe1\u53f7\u5728\u7535\u7f06\u4e0a\u7684\u4f20\u8f93\u662f\u53cc\u5411\u7684\uff0c\u56e0\u6b64\uff0c\u5728\u901a\u8baf\u7535\u7f06\u7684\u53e6\u4e00\u7aef\u53ef\u8de8\u63a5\u4e00\u4e2a\u540c\u6837\u5927\u5c0f\u7684\u7ec8\u7aef\u7535\u963b\u4ece\u7406\u8bba\u4e0a\u5206\u6790\uff0c\u5728\u4f20\u8f93\u7535\u7f06\u7684\u672b\u7aef\u53ea\u8981\u8de8\u63a5\u4e86\u4e0e\u7535\u7f06\u7279\u6027\u963b\u6297\u76f8\u5339\u914d\u7684\u7ec8\u7aef\u7535\u963b\uff0c\u5c31\u518d\u4e5f\u4e0d\u4f1a\u51fa\u73b0\u4fe1\u53f7\u53cd\u5c04\u73b0\u8c61\u3002<\/p>\n
\u4f46\u662f\uff0c\u5728\u5b9e\u73b0\u5e94\u7528\u4e2d\uff0c\u7531\u4e8e\u4f20\u8f93\u7535\u7f06\u7684\u7279\u6027\u963b\u6297\u4e0e\u901a\u8baf\u6ce2\u7279\u7387\u7b49\u5e94\u7528\u73af\u5883\u6709\u5173\uff0c\u7279\u6027\u963b\u6297\u4e0d\u53ef\u80fd\u4e0e\u7ec8\u7aef\u7535\u963b\u5b8c\u5168\u76f8\u7b49\uff0c\u56e0\u6b64\u6216\u591a\u6216\u5c11\u7684\u4fe1\u53f7\u53cd\u5c04\u8fd8\u4f1a\u5b58\u5728\u3002<\/p>\n
\u5f15\u8d77\u4fe1\u53f7\u53cd\u5c04\u7684\u53e6\u4e2a\u539f\u56e0\u662f\u6570\u636e\u6536\u53d1\u5668\u4e0e\u4f20\u8f93\u7535\u7f06\u4e4b\u95f4\u7684\u963b\u6297\u4e0d\u5339\u914d\u3002\u8fd9\u79cd\u539f\u56e0\u5f15\u8d77\u7684\u53cd\u5c04\uff0c\u4e3b\u8981\u8868\u73b0\u5728\u901a\u8baf\u7ebf\u8def\u5904\u5728\u7a7a\u95f2\u65b9\u5f0f\u65f6\uff0c\u6574\u4e2a\u7f51\u7edc\u6570\u636e\u6df7\u4e71\u3002<\/p>\n
\u4fe1\u53f7\u53cd\u5c04\u5bf9\u6570\u636e\u4f20\u8f93\u7684\u5f71\u54cd\uff0c\u5f52\u6839\u7ed3\u5e95\u662f\u56e0\u4e3a\u53cd\u5c04\u4fe1\u53f7\u89e6\u53d1\u4e86\u63a5\u6536\u5668\u8f93\u5165\u7aef\u7684\u6bd4\u8f83\u5668\uff0c\u4f7f\u63a5\u6536\u5668\u6536\u5230\u4e86\u9519\u8bef\u7684\u4fe1\u53f7\uff0c\u5bfc\u81f4CRC\u6821\u9a8c\u9519\u8bef\u6216\u6574\u4e2a\u6570\u636e\u5e27\u9519\u8bef\u3002\u5728\u4fe1\u53f7\u5206\u6790\uff0c\u8861\u91cf\u53cd\u5c04\u4fe1\u53f7\u5f3a\u5ea6\u7684\u53c2\u6570\u662fRAF(RefectionAttenuationFactor\u53cd\u5c04\u8870\u51cf\u56e0\u5b50)\u3002\u5b83\u7684\u8ba1\u7b97\u516c\u5f0f\u5982\u5f0f(1)\u3002RAF=20lg(Vref\/Vinc)(1)\u5f0f\u4e2d\uff1aVref-\u53cd\u5c04\u4fe1\u53f7\u7684\u7535\u538b\u5927\u5c0f;Vinc-\u5728\u7535\u7f06\u4e0e\u6536\u53d1\u5668\u6216\u7ec8\u7aef\u7535\u963b\u8fde\u63a5\u70b9\u7684\u5165\u5c04\u4fe1\u53f7\u7684\u7535\u538b\u5927\u5c0f\u3002\u5177\u4f53\u7684\u6d4b\u91cf\u65b9\u6cd5\u5982\u56fe3\u6240\u793a\u3002\u4f8b\u5982\uff0c\u7531\u5b9e\u9a8c\u6d4b\u5f972.5MHz\u7684\u5165\u5c04\u4fe1\u53f7\u6b63\u5f26\u6ce2\u7684\u5cf0-\u5cf0\u503c\u4e3a+5V\uff0c\u53cd\u5c04\u4fe1\u53f7\u7684\u5cf0-\u5cf0\u503c\u4e3a+0.297V\uff0c\u5219\u8be5\u901a\u8baf\u7535\u7f06\u57282.5MHz\u7684\u901a\u8baf\u901f\u7387\u65f6\uff0c\u5b83\u7684\u53cd\u5c04\u8870\u51cf\u56e0\u5b50\u4e3a\uff1aRAF=20lg(0.297\/2.5)=-24.52dB\u8981\u51cf\u5f31\u53cd\u5c04\u4fe1\u53f7\u5bf9\u901a\u8baf\u7ebf\u8def\u7684\u5f71\u54cd\uff0c\u901a\u5e38\u91c7\u7528\u566a\u58f0\u6291\u5236\u548c\u52a0\u504f\u7f6e\u7535\u963b\u7684\u65b9\u6cd5\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5bf9\u4e8e\u6bd4\u8f83\u5c0f\u7684\u53cd\u5c04\u4fe1\u53f7\uff0c\u4e3a\u7b80\u5355\u65b9\u4fbf\uff0c\u7ecf\u5e38\u91c7\u7528\u52a0\u504f\u7f6e\u7535\u963b\u7684\u65b9\u6cd5\u3002\u5728\u901a\u8baf\u7ebf\u8def\u4e2d\uff0c\u5982\u4f55\u901a\u8fc7\u52a0\u504f\u7f6e\u7535\u963b\u63d0\u9ad8\u901a\u8baf\u53ef\u9760\u6027\u7684\u539f\u7406\uff0c\u540e\u9762\u5c06\u505a\u8be6\u7ec6\u4ecb\u7ecd\u3002\u5341\u56db\u3001\u5728\u901a\u8baf\u7535\u7f06\u4e2d\u7684\u4fe1\u53f7\u8870\u51cf\u7b2c\u4e8c\u4e2a\u5f71\u54cd\u4fe1\u53f7\u4f20\u8f93\u7684\u56e0\u7d20\u662f\u4fe1\u53f7\u5728\u7535\u7f06\u7684\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u8870\u51cf\u3002\u4e00\u6761\u4f20\u8f93\u7535\u7f06\u53ef\u4ee5\u628a\u5b83\u770b\u51fa\u7531\u5206\u5e03\u7535\u5bb9\u3001\u5206\u5e03\u7535\u611f\u548c\u7535\u963b\u8054\u5408\u7ec4\u6210\u7684\u7b49\u6548\u7535\u8def\u3002\u7535\u7f06\u7684\u5206\u5e03\u7535\u5bb9C\u4e3b\u8981\u662f\u7531\u53cc\u7ede\u7ebf\u7684\u4e24\u6761\u5e73\u884c\u5bfc\u7ebf\u4ea7\u751f\u3002\u5bfc\u7ebf\u7684\u7535\u963b\u5728\u8fd9\u91cc\u5bf9\u4fe1\u53f7\u7684\u5f71\u54cd\u5f88\u5c0f\uff0c\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u3002<\/p>\n
\u4fe1\u53f7\u7684\u635f\u5931\u4e3b\u8981\u662f\u7531\u4e8e\u7535\u7f06\u7684\u5206\u5e03\u7535\u5bb9\u548c\u5206\u5e03\u7535\u611f\u7ec4\u6210\u7684LC\u4f4e\u901a\u6ee4\u6ce2\u5668\u3002PROFIBUS\u7528\u7684LAN\u6807\u51c6\u578b\u4e8c\u82af\u7535\u611f(\u897f\u95e8\u5b50\u4e3aDP\u603b\u7ebf\u9009\u7528\u7684\u6807\u51c6\u7535\u7f06)\uff0c\u5728\u4e0d\u540c\u6ce2\u7279\u7387\u65f6\u7684\u8870\u51cf\u7cfb\u6570\u5982\u88681\u6240\u793a\u3002<\/p>\n
<\/p>\n
\u5341\u4e94\u3001\u5728\u901a\u8baf\u7535\u7f06\u4e2d\u7684\u7eaf\u963b\u8d1f\u8f7d<\/p>\n
\u5f71\u54cd\u901a\u8baf\u6027\u80fd\u7684\u7b2c\u4e09\u4e2a\u56e0\u7d20\u662f\u7eaf\u963b\u6027\u8d1f\u8f7d(\u4e5f\u53eb\u76f4\u6d41\u8d1f\u8f7d)\u7684\u5927\u5c0f\u3002\u8fd9\u91cc\u6307\u7684\u7eaf\u963b\u6027\u8d1f\u8f7d\u4e3b\u8981\u7531\u7ec8\u7aef\u7535\u963b\u3001\u504f\u7f6e\u7535\u963b\u548cRS-485\u6536\u53d1\u5668\u4e09\u8005\u6784\u6210\u3002\u5728\u53d9\u8ff0EIARS-485\u89c4\u8303\u65f6\u66fe\u63d0\u5230\u8fc7RS-485\u9a71\u52a8\u5668\u5728\u5e26\u4e8632\u4e2a\u8282\u70b9\uff0c\u914d\u7f6e\u4e86150\u03a9\u7ec8\u7aef\u7535\u963b\u7684\u60c5\u51b5\u4e0b\uff0c\u81f3\u5c11\u80fd\u8f93\u51fa1.5V\u7684\u5dee\u5206\u7535\u538b\u3002\u4e00\u4e2a\u63a5\u6536\u5668\u7684\u8f93\u5165\u7535\u963b\u4e3a12k\u03a9\uff0c\u6574\u4e2a\u7f51\u7edc\u7684\u7b49\u6548\u7535\u8def\u5982\u56fe5\u6240\u793a\u3002\u6309\u8fd9\u6837\u8ba1\u7b97\uff0cRS-485\u9a71\u52a8\u5668\u7684\u8d1f\u8f7d\u80fd\u529b\u4e3a\uff1aRL=32\u4e2a\u8f93\u5165\u7535\u963b\u5e76\u8054||2\u4e2a\u7ec8\u7aef\u7535\u963b=((12000\/32)\u00d7(150\/2))\/(12000\/32)+(150\/2))\u224851.7\u03a9\u73b0\u5728\u6bd4\u8f83\u5e38\u7528\u7684RS-485\u9a71\u52a8\u5668\u6709MAX485\u3001DS3695\u3001MAX1488\/1489\u4ee5\u53ca\u548c\u5229\u65f6\u516c\u53f8\u4f7f\u7528\u7684SN75176A\/D\u7b49\uff0c\u5176\u4e2d\u6709\u7684RS-485\u9a71\u52a8\u5668\u8d1f\u8f7d\u80fd\u529b\u53ef\u4ee5\u8fbe\u523020\u03a9\u3002\u5728\u4e0d\u8003\u8651\u5176\u5b83\u8bf8\u591a\u56e0\u7d20\u7684\u60c5\u51b5\u4e0b\uff0c\u6309\u7167\u9a71\u52a8\u80fd\u529b\u548c\u8d1f\u8f7d\u7684\u5173\u7cfb\u8ba1\u7b97\uff0c\u4e00\u4e2a\u9a71\u52a8\u5668\u53ef\u5e26\u8282\u70b9\u7684\u6700\u5927\u6570\u91cf\u5c06\u8fdc\u8fdc\u5927\u4e8e32\u4e2a\u3002\u5728\u901a\u8baf\u6ce2\u7279\u7387\u6bd4\u8f83\u9ad8\u7684\u65f6\u5019\uff0c\u5728\u7ebf\u8def\u4e0a\u504f\u7f6e\u7535\u963b\u662f\u5f88\u6709\u5fc5\u8981\u7684\u3002\u504f\u7f6e\u7535\u963b\u7684\u8fde\u63a5\u65b9\u6cd5\u5982\u56fe6\u3002\u5b83\u7684\u4f5c\u7528\u662f\u5728\u7ebf\u8def\u8fdb\u5165\u7a7a\u95f2\u72b6\u6001\u540e\uff0c\u628a\u603b\u7ebf\u4e0a\u6ca1\u6709\u6570\u636e\u65f6(\u7a7a\u95f2\u65b9\u5f0f)\u7684\u7535\u5e73\u62c9\u79bb0\u7535\u5e73\uff0c\u5982\u56fe7\u3002<\/p>\n
\u8fd9\u6837\u4e00\u6765\uff0c\u5373\u4f7f\u7ebf\u8def\u4e2d\u51fa\u73b0\u4e86\u6bd4\u8f83\u5c0f\u7684\u53cd\u5c04\u4fe1\u53f7\u6216\u5e72\u6270\uff0c\u6302\u63a5\u5728\u603b\u7ebf\u4e0a\u7684\u6570\u636e\u63a5\u6536\u5668\u4e5f\u4e0d\u4f1a\u7531\u4e8e\u8fd9\u4e9b\u4fe1\u53f7\u7684\u5230\u6765\u800c\u4ea7\u751f\u8bef\u52a8\u4f5c\u3002\u901a\u8fc7\u4e0b\u9762\u540e\u4f8b\u5b50\u4e86\uff0c\u53ef\u4ee5\u8ba1\u7b97\u51fa\u504f\u7f6e\u7535\u963b\u7684\u5927\u5c0f\uff1a\u7ec8\u7aef\u7535\u963bRt1=Rr2=120\u03a9;\u5047\u8bbe\u53cd\u5c04\u4fe1\u53f7\u6700\u5927\u7684\u5cf0-\u5cf0\u503cVref\u22640.3Vp-p\uff0c\u5219\u8d1f\u534a\u5468\u7684\u7535\u538bVref\u22640.15V;\u7ec8\u7aef\u7684\u7535\u963b\u4e0a\u7531\u53cd\u5c04\u4fe1\u53f7\u5f15\u8d77\u7684\u53cd\u5c04\u7535\u6d41Iref\u22640.15\/(120||120)=2.5mA\u3002\u4e00\u822cRS-485\u6536\u53d1\u5668(\u5305\u62ecSN75176)\u7684\u6ede\u540e\u7535\u538b\u503c(hysteresisvalue)\u4e3a50mV\uff0c\u5373\uff1a<\/p>\n
(Ibias-Iref)\u00d7(Rt1||Rt2)\u226550mV\u4e8e\u662f\u53ef\u4ee5\u8ba1\u7b97\u51fa\u504f\u7f6e\u7535\u963b\u4ea7\u751f\u7684\u504f\u7f6e\u7535\u6d41Ibias\u22653.33mA+5V=Ibias(R\u4e0a\u62c9+R\u4e0b\u62c9+(Rt1||Rt2))(2)\u901a\u8fc7\u5f0f2\u53ef\u4ee5\u8ba1\u7b97\u51faR\u4e0a\u62c9=R\u4e0b\u62c9=720\u03a9<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0cRS-485\u603b\u7ebf\u52a0\u504f\u7f6e\u7535\u963b\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n
(1)\u628a\u504f\u7f6e\u7535\u963b\u5e73\u8861\u5206\u914d\u7ed9\u603b\u7ebf\u4e0a\u7684\u6bcf\u4e00\u4e2a\u6536\u53d1\u5668\u3002\u8fd9\u79cd\u65b9\u6cd5\u7ed9\u6302\u63a5\u5728RS-485\u603b\u7ebf\u4e0a\u7684\u6bcf\u4e00\u4e2a\u6536\u53d1\u5668\u52a0\u4e86\u504f\u7f6e\u7535\u963b\uff0c\u7ed9\u6bcf\u4e00\u4e2a\u6536\u53d1\u5668\u90fd\u52a0\u4e86\u4e00\u4e2a\u504f\u7f6e\u7535\u538b\u3002<\/p>\n
(2)\u5728\u4e00\u6bb5\u603b\u7ebf\u4e0a\u53ea\u7528\u4e00\u5bf9\u504f\u7f6e\u7535\u963b\u3002\u8fd9\u79cd\u65b9\u6cd5\u5bf9\u603b\u7ebf\u4e0a\u5b58\u5728\u5927\u7684\u53cd\u5c04\u4fe1\u53f7\u6216\u5e72\u6270\u4fe1\u53f7\u6bd4\u8f83\u6709\u6548\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\u504f\u7f6e\u7535\u963b\u7684\u52a0\u5165\uff0c\u589e\u52a0\u4e86\u603b\u7ebf\u7684\u8d1f\u8f7d\u3002\u5341\u516d\u3001RS-485\u603b\u7ebf\u7684\u8d1f\u8f7d\u80fd\u529b\u548c\u901a\u8baf\u7535\u7f06\u957f\u5ea6\u4e4b\u95f4\u7684\u5173\u7cfb\u5728\u8bbe\u8ba1RS-485\u603b\u7ebf\u7ec4\u6210\u7684\u7f51\u7edc\u914d\u7f6e(\u603b\u7ebf\u957f\u5ea6\u548c\u5e26\u8d1f\u8f7d\u4e2a\u6570)\u65f6\uff0c\u5e94\u8be5\u8003\u8651\u5230\u4e09\u4e2a\u53c2\u6570\uff1a\u7eaf\u963b\u6027\u8d1f\u8f7d\u3001\u4fe1\u53f7\u8870\u51cf\u548c\u566a\u58f0\u5bb9\u9650\u3002\u7eaf\u963b\u6027\u8d1f\u8f7d\u3001\u4fe1\u53f7\u8870\u51cf\u8fd9\u4e24\u4e2a\u53c2\u6570\uff0c\u5728\u524d\u9762\u5df2\u7ecf\u8ba8\u8bba\u8fc7\uff0c\u73b0\u5728\u8981\u8ba8\u8bba\u7684\u662f\u566a\u58f0\u5bb9\u9650(NoiseMargin)\u3002RS-485\u603b\u7ebf\u63a5\u6536\u5668\u7684\u566a\u58f0\u5bb9\u9650\u81f3\u5c11\u5e94\u8be5\u5927\u4e8e200mV\u3002<\/p>\n
\u524d\u9762\u7684\u8bba\u8ff0\u8005\u662f\u5728\u5047\u8bbe\u566a\u58f0\u5bb9\u9650\u4e3a0\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u7684\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u4e3a\u4e86\u63d0\u9ad8\u603b\u7ebf\u7684\u6297\u5e72\u6270\u80fd\u529b\uff0c\u603b\u5e0c\u671b\u7cfb\u7edf\u7684\u566a\u58f0\u5bb9\u9650\u6bd4EIARS-485\u6807\u51c6\u4e2d\u89c4\u5b9a\u7684\u597d\u4e00\u4e9b\u3002\u4ece\u4e0b\u9762\u7684\u516c\u5f0f\u80fd\u770b\u51fa\u603b\u7ebf\u5e26\u8d1f\u8f7d\u7684\u591a\u5c11\u548c\u901a\u8baf\u7535\u7f06\u957f\u5ea6\u4e4b\u95f4\u7684\u5173\u7cfb\uff1aVend=0.8(Vdriver-Vloss-Vnoise-Vbias)(3)\u5176\u4e2d\uff1aVend\u4e3a\u603b\u7ebf\u672b\u7aef\u7684\u4fe1\u53f7\u7535\u538b\uff0c\u5728\u6807\u51c6\u6d4b\u5b9a\u65f6\u89c4\u5b9a\u4e3a0.2V;Vdriver\u4e3a\u9a71\u52a8\u5668\u7684\u8f93\u51fa\u7535\u538b(\u4e0e\u8d1f\u8f7d\u6570\u6709\u5173\u3002<\/p>\n
\u8d1f\u8f7d\u6570\u57285\uff5e35\u4e2a\u4e4b\u95f4\uff0cVdriver=2.4V;\u5f53\u8d1f\u8f7d\u6570\u5c0f\u4e8e5\uff0cVdriver=2.5V;\u5f53\u8d1f\u8f7d\u6570\u5927\u4e8e35\uff0cVdriver\u22642.3V);Vloss\u4e3a\u4fe1\u53f7\u5728\u603b\u7ebf\u4e2d\u7684\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u7684\u635f\u8017(\u4e0e\u901a\u8baf\u7535\u7f06\u7684\u89c4\u683c\u548c\u957f\u5ea6\u6709\u5173)\uff0c\u7531\u88681\u63d0\u4f9b\u7684\u6807\u51c6\u7535\u7f06\u7684\u8870\u51cf\u7cfb\u6570\uff0c\u6839\u636e\u516c\u5f0f\u8870\u51cf\u7cfb\u6570b=20lg(Vout\/Vin)\u53ef\u4ee5\u8ba1\u7b97\u51faVloss=Vin-Vout=0.6V(\u6ce8\uff1a\u901a\u8baf\u6ce2\u7279\u7387\u4e3a9.6kbps\uff0c\u7535\u7f06\u957f\u5ea61km\uff0c\u5982\u679c\u7279\u7387\u589e\u52a0\uff0cVloss\u4f1a\u76f8\u5e94\u589e\u5927);Vnoise\u4e3a\u566a\u58f0\u5bb9\u9650\uff0c\u5728\u6807\u51c6\u6d4b\u5b9a\u65f6\u89c4\u5b9a\u4e3a0.1V;Vbias\u662f\u7531\u504f\u7f6e\u7535\u963b\u63d0\u4f9b\u7684\u504f\u7f6e\u7535\u538b(\u5178\u578b\u503c\u4e3a0.4V)\u3002<\/p>\n
\u5f0f(3)\u4e2d\u4e58\u4ee50.8\u662f\u4e3a\u4e86\u4f7f\u901a\u4fe1\u7535\u7f06\u4e0d\u8fdb\u5165\u6ee1\u8f7d\u72b6\u6001\u3002\u4ece\u5f0f(3)\u53ef\u4ee5\u770b\u51fa\uff0cVdriver\u7684\u5927\u5c0f\u548c\u603b\u7ebf\u4e0a\u5e26\u8d1f\u8f7d\u6570\u7684\u591a\u5c11\u6210\u53cd\u6bd4\uff0cVloss\u7684\u5927\u5c0f\u548c\u603b\u7ebf\u957f\u5ea6\u6210\u53cd\u6bd4\uff0c\u5176\u4ed6\u51e0\u4e2a\u53c2\u6570\u53ea\u548c\u7528\u7684\u9a71\u52a8\u5668\u7c7b\u578b\u6709\u5173\u3002<\/p>\n
\u56e0\u6b64\uff0c\u5728\u9009\u5b9a\u4e86\u9a71\u52a8\u5668\u7684RS-495\u603b\u7ebf\u4e0a\uff0c\u5728\u901a\u4fe1\u6ce2\u7279\u7387\u4e00\u5b9a\u7684\u60c5\u51b5\u4e0b\uff0c\u5e26\u8d1f\u8f7d\u6570\u7684\u591a\u5c11\uff0c\u4e0e\u4fe1\u53f7\u80fd\u4f20\u8f93\u7684\u6700\u5927\u8ddd\u79bb\u662f\u76f4\u63a5\u76f8\u5173\u7684\u3002\u5177\u4f53\u5173\u7cfb\u662f\uff1a<\/p>\n
\u5728\u603b\u7ebf\u5141\u8bb8\u7684\u8303\u56f4\u5185\uff0c\u5e26\u8d1f\u8f7d\u6570\u8d8a\u591a\uff0c\u4fe1\u53f7\u80fd\u4f20\u8f93\u7684\u8ddd\u79bb\u5c31\u8d8a\u5c0f;\u5e26\u8d1f\u8f7d\u6570\u636e\u5c11\uff0c\u4fe1\u53f7\u80fd\u4f20\u8f93\u7684\u8ddd\u79bb\u5c31\u53d1\u8d8a\u8fdc\u3002\u5341\u4e03\u3001\u5206\u5e03\u7535\u5bb9\u5bf9RS-485\u603b\u7ebf\u4f20\u8f93\u6027\u80fd\u7684\u5f71\u54cd\u7535\u7f06\u7684\u5206\u5e03\u7535\u5bb9\u4e3b\u662f\u7531\u53cc\u7ede\u7ebf\u7684\u4e24\u6761\u5e73\u884c\u5bfc\u7ebf\u4ea7\u751f\u3002\u53e6\u5916\uff0c\u5bfc\u7ebf\u548c\u5730\u4e4b\u95f4\u4e5f\u5b58\u5728\u5206\u5e03\u7535\u5bb9\uff0c\u867d\u7136\u5f88\u5c0f\uff0c\u4f46\u5728\u5206\u6790\u65f6\u4e5f\u4e0d\u80fd\u5ffd\u89c6\u3002\u5206\u5e03\u7535\u5bb9\u5bf9\u603b\u7ebf\u4f20\u8f93\u6027\u80fd\u7684\u5f71\u54cd\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u603b\u7ebf\u4e0a\u4f20\u8f93\u7684\u662f\u57fa\u6ce2\u4fe1\u53f7\uff0c\u4fe1\u53f7\u7684\u8868\u8fbe\u65b9\u5f0f\u53ea\u6709”1″\u548c”0″\u3002<\/p>\n
\u5728\u7279\u6b8a\u7684\u5b57\u8282\u4e2d\uff0c\u4f8b\u59820x01\uff0c\u4fe1\u53f7”0″\u4f7f\u5f97\u5206\u5e03\u7535\u5bb9\u6709\u8db3\u591f\u7684\u5145\u7535\u65f6\u95f4\uff0c\u800c\u4fe1\u53f7”1″\u5230\u6765\u65f6\uff0c\u7531\u4e8e\u5206\u5e03\u7535\u5bb9\u4e2d\u7684\u7535\u8377\uff0c\u6765\u4e0d\u53ca\u653e\u7535\uff0c(Vin+)-(Vin-)-\u8fd8\u5927\u4e8e200mV\uff0c\u7ed3\u679c\u4f7f\u63a5\u7231\u8bef\u8ba4\u4e3a\u662f”0″\uff0c\u800c\u6700\u7ec8\u5bfc\u81f4CRC\u6821\u9a8c\u9519\u8bef\uff0c\u6574\u4e2a\u6570\u636e\u5e27\u4f20\u8f93\u9519\u8bef\u3002<\/p>\n
\u7531\u4e8e\u603b\u7ebf\u4e0a\u5206\u5e03\u5f71\u54cd\uff0c\u5bfc\u81f4\u6570\u636e\u4f20\u8f93\u9519\u8bef\uff0c\u4ece\u800c\u4f7f\u6574\u4e2a\u7f51\u7edc\u6027\u80fd\u964d\u4f4e\u3002\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a<\/p>\n
(1)\u964d\u4f4e\u6570\u636e\u4f20\u8f93\u7684\u6ce2\u7279\u7387;(2)\u4f7f\u7528\u5206\u5e03\u7535\u5bb9\u5c0f\u7684\u7535\u7f06\uff0c\u63d0\u9ad8\u4f20\u8f93\u7ebf\u7684\u8d28\u91cf\u3002\u5341\u516b\u3001\u5355\u5de5\u3001\u534a\u53cc\u5de5\u548c\u5168\u53cc\u5de5\u7684\u5b9a\u4e49\u5982\u679c\u5728\u901a\u4fe1\u8fc7\u7a0b\u7684\u4efb\u610f\u65f6\u523b\uff0c\u4fe1\u606f\u53ea\u80fd\u7531\u4e00\u65b9A\u4f20\u5230\u53e6\u4e00\u65b9B\uff0c\u5219\u79f0\u4e3a\u5355\u5de5\u3002<\/p>\n
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