{"id":74687,"date":"2026-02-10T11:58:50","date_gmt":"2026-02-10T03:58:50","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/74687.html"},"modified":"2026-02-10T11:58:50","modified_gmt":"2026-02-10T03:58:50","slug":"%e4%bb%8euart%e5%88%b0rs485%ef%bc%9a%e4%b8%b2%e8%a1%8c%e9%80%9a%e4%bf%a1%e5%8d%8f%e8%ae%ae%e4%b8%8e%e7%94%b5%e5%b9%b3%e6%a0%87%e5%87%86%e7%9a%84%e5%ae%9e%e6%88%98%e9%80%89%e5%9e%8b%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/74687.html","title":{"rendered":"\u4eceUART\u5230RS485\uff1a\u4e32\u884c\u901a\u4fe1\u534f\u8bae\u4e0e\u7535\u5e73\u6807\u51c6\u7684\u5b9e\u6218\u9009\u578b\u6307\u5357"},"content":{"rendered":"

1. \u4e32\u884c\u901a\u4fe1\u57fa\u7840：\u4eceUART\u534f\u8bae\u5230\u7535\u5e73\u6807\u51c6<\/h3>\n

\u4e32\u884c\u901a\u4fe1\u662f\u5d4c\u5165\u5f0f\u7cfb\u7edf\u548c\u5de5\u4e1a\u63a7\u5236\u4e2d\u6700\u57fa\u7840\u7684\u901a\u4fe1\u65b9\u5f0f\u4e4b\u4e00\u3002\u6211\u521a\u5f00\u59cb\u63a5\u89e6\u8fd9\u4e2a\u9886\u57df\u65f6，\u4e5f\u88abUART\u3001TTL\u3001RS232\u3001RS422\u3001RS485\u8fd9\u4e9b\u672f\u8bed\u641e\u5f97\u5934\u6655\u773c\u82b1\u3002\u540e\u6765\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u8e29\u8fc7\u4e0d\u5c11\u5751，\u624d\u6162\u6162\u7406\u6e05\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n

\u7b80\u5355\u6765\u8bf4，UART（\u901a\u7528\u5f02\u6b65\u6536\u53d1\u5668）\u662f\u901a\u4fe1\u534f\u8bae\u7684"\u5927\u8111"，\u8d1f\u8d23\u6570\u636e\u7684\u6253\u5305\u548c\u89e3\u5305\u3002\u5b83\u5b9a\u4e49\u4e86\u6570\u636e\u5e27\u7684\u683c\u5f0f：\u8d77\u59cb\u4f4d\u3001\u6570\u636e\u4f4d\u3001\u6821\u9a8c\u4f4d\u548c\u505c\u6b62\u4f4d\u3002\u4f46UART\u672c\u8eab\u4e0d\u5173\u5fc3\u7535\u6c14\u7279\u6027，\u5b83\u53ea\u662f\u5904\u7406\u903b\u8f91\u4fe1\u53f7\u3002<\/p>\n

TTL\u7535\u5e73\u662fUART\u6700\u5e38\u7528\u7684"\u8bed\u8a00"\u3002\u5728\u7535\u8def\u677f\u4e0a，\u4f60\u770b\u5230\u76843.3V\u62165V\u4fe1\u53f7\u5c31\u662fTTL\u7535\u5e73\u3002\u903b\u8f910\u63a5\u8fd10V，\u903b\u8f911\u63a5\u8fd1\u7535\u6e90\u7535\u538b\u3002\u8fd9\u79cd\u7535\u5e73\u9002\u5408\u677f\u5185\u77ed\u8ddd\u79bb\u901a\u4fe1，\u6bd4\u5982\u5355\u7247\u673a\u4e0e\u4f20\u611f\u5668\u4e4b\u95f4\u7684\u8fde\u63a5\u3002<\/p>\n

\u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u6211\u7ecf\u5e38\u7528USB-TTL\u8f6c\u6362\u5668\u6765\u8c03\u8bd5\u5355\u7247\u673a\u3002\u8fde\u63a5\u65f6\u9700\u8981\u6ce8\u610fTX\u548cRX\u8981\u4ea4\u53c9\u8fde\u63a5：\u53d1\u9001\u7aefTX\u63a5\u63a5\u6536\u7aefRX，\u63a5\u6536\u7aefRX\u63a5\u53d1\u9001\u7aefTX\u3002\u5982\u679c\u63a5\u53cd\u4e86，\u6570\u636e\u5c31\u4f20\u4e0d\u8fc7\u53bb，\u8fd9\u662f\u6211\u521a\u5f00\u59cb\u7ecf\u5e38\u72af\u7684\u9519\u8bef\u3002<\/p>\n

\/\/ \u7b80\u5355\u7684UART\u521d\u59cb\u5316\u4ee3\u7801\u793a\u4f8b（STM32）
\nvoid UART_Init(void) {
\n \/\/ \u4f7f\u80fdUSART\u65f6\u949f
\n RCC->APB2ENR |= RCC_APB2ENR_USART1EN;<\/p>\n

\/\/ \u914d\u7f6e\u6ce2\u7279\u7387\u4e3a115200
\n USART1->BRR = 8000000 \/ 115200;<\/p>\n

\/\/ \u4f7f\u80fd\u53d1\u9001\u548c\u63a5\u6536
\n USART1->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE;
\n}<\/p>\n

\u5f53\u901a\u4fe1\u8ddd\u79bb\u8d85\u8fc71-2\u7c73，\u6216\u8005\u73af\u5883\u4e2d\u6709\u7535\u78c1\u5e72\u6270\u65f6，TTL\u7535\u5e73\u5c31\u663e\u5f97\u529b\u4e0d\u4ece\u5fc3\u4e86\u3002\u8fd9\u65f6\u5019\u5c31\u9700\u8981\u66f4\u5f3a\u5927\u7684\u7269\u7406\u5c42\u6807\u51c6，\u6bd4\u5982RS232\u3001RS422\u6216RS485\u3002\u8fd9\u4e9b\u6807\u51c6\u5b9a\u4e49\u4e86\u7535\u538b\u6c34\u5e73\u3001\u4fe1\u53f7\u7279\u6027\u548c\u8fde\u63a5\u65b9\u5f0f，\u786e\u4fdd\u4fe1\u53f7\u80fd\u591f\u957f\u8ddd\u79bb\u53ef\u9760\u4f20\u8f93\u3002<\/p>\n

2. \u7535\u5e73\u6807\u51c6\u8be6\u89e3：TTL\u3001RS232\u3001RS422\u3001RS485\u7684\u7279\u6027\u5bf9\u6bd4<\/h3>\n

2.1 TTL\u7535\u5e73：\u677f\u5185\u901a\u4fe1\u7684\u9996\u9009<\/h4>\n

TTL\u7535\u5e73\u662f\u6570\u5b57\u7535\u8def\u4e2d\u6700\u5e38\u89c1\u7684\u7535\u5e73\u6807\u51c6\u3002\u57283.3V\u7cfb\u7edf\u4e2d，\u901a\u5e380-0.8V\u8868\u793a\u903b\u8f910，2.0-3.3V\u8868\u793a\u903b\u8f911；\u57285V\u7cfb\u7edf\u4e2d，\u903b\u8f910\u662f0-0.8V，\u903b\u8f911\u662f2.0-5.5V\u3002TTL\u7684\u4f18\u52bf\u662f\u7b80\u5355\u3001\u6210\u672c\u4f4e，\u9002\u5408\u7535\u8def\u677f\u5185\u90e8\u7684\u77ed\u8ddd\u79bb\u901a\u4fe1\u3002<\/p>\n

\u4f46\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d，TTL\u6709\u51e0\u4e2a\u660e\u663e\u7684\u5c40\u9650\u6027\u3002\u9996\u5148\u662f\u6297\u5e72\u6270\u80fd\u529b\u5dee，\u56e0\u4e3a\u4fe1\u53f7\u4ee5\u5730\u4e3a\u53c2\u8003，\u5bb9\u6613\u53d7\u5230\u5730\u7535\u4f4d\u5dee\u548c\u566a\u58f0\u7684\u5f71\u54cd\u3002\u5176\u6b21\u662f\u4f20\u8f93\u8ddd\u79bb\u77ed，\u4e00\u822c\u4e0d\u8d85\u8fc71-2\u7c73\u3002\u6211\u66fe\u7ecf\u5c1d\u8bd5\u7528\u675c\u90a6\u7ebf\u8fde\u63a5\u4e24\u4e2a\u5f00\u53d1\u677f，\u8ddd\u79bb\u8d85\u8fc750\u5398\u7c73\u5c31\u7ecf\u5e38\u51fa\u73b0\u8bef\u7801\u3002<\/p>\n

2.2 RS232：\u5de5\u4e1a\u6807\u51c6\u7684\u8d77\u70b9<\/h4>\n

RS232\u662f\u4e3a\u4e86\u89e3\u51b3TTL\u8ddd\u79bb\u9650\u5236\u800c\u8bde\u751f\u7684\u6807\u51c6\u3002\u5b83\u91c7\u7528\u8d1f\u903b\u8f91：+3V\u5230+15V\u8868\u793a\u903b\u8f910，-3V\u5230-15V\u8868\u793a\u903b\u8f911\u3002\u8fd9\u79cd\u5927\u7535\u538b\u6446\u5e45\u8ba9RS232\u7684\u4f20\u8f93\u8ddd\u79bb\u53ef\u4ee5\u8fbe\u523015\u7c73\u5de6\u53f3，\u5728\u4f4e\u6ce2\u7279\u7387\u4e0b\u751a\u81f3\u66f4\u8fdc\u3002<\/p>\n

RS232\u901a\u5e38\u4f7f\u7528DB9\u8fde\u63a5\u5668，\u4f46\u5b9e\u9645\u901a\u4fe1\u5f80\u5f80\u53ea\u9700\u8981\u4e09\u6839\u7ebf：TXD（\u53d1\u9001）\u3001RXD（\u63a5\u6536）\u548cGND（\u5730）\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f，RS232\u7684\u903b\u8f91\u7535\u5e73\u548cTTL\u662f\u76f8\u53cd\u7684，\u6240\u4ee5\u5fc5\u987b\u4f7f\u7528MAX232\u4e4b\u7c7b\u7684\u7535\u5e73\u8f6c\u6362\u82af\u7247\u3002<\/p>\n

\u6211\u5728\u5de5\u4e1a\u73b0\u573a\u89c1\u8fc7\u5f88\u591a\u8001\u8bbe\u5907\u4ecd\u7136\u4f7f\u7528RS232\u63a5\u53e3，\u6bd4\u5982\u6570\u63a7\u673a\u5e8a\u3001PLC\u7f16\u7a0b\u53e3\u7b49\u3002\u867d\u7136\u5b83\u7684\u901f\u7387\u4e0d\u9ad8（\u901a\u5e38\u4e0d\u8d85\u8fc7115.2kbps），\u4f46\u5728\u70b9\u5bf9\u70b9\u901a\u4fe1\u4e2d\u4ecd\u7136\u5f88\u53ef\u9760\u3002<\/p>\n

2.3 RS422：\u5dee\u5206\u4f20\u8f93\u7684\u8fdb\u9636<\/h4>\n

RS422\u5f15\u5165\u4e86\u5dee\u5206\u4fe1\u53f7\u4f20\u8f93，\u8fd9\u662f\u901a\u4fe1\u6280\u672f\u7684\u4e00\u5927\u8fdb\u6b65\u3002\u5b83\u4f7f\u7528\u4e24\u6839\u7ebf\u4f20\u8f93\u4e00\u4e2a\u4fe1\u53f7：A\u7ebf（TXD-）\u548cB\u7ebf（TXD+）\u3002\u63a5\u6536\u7aef\u901a\u8fc7\u68c0\u6d4b\u4e24\u6839\u7ebf\u4e4b\u95f4\u7684\u7535\u538b\u5dee\u6765\u5224\u65ad\u903b\u8f91\u72b6\u6001：VA-VB \u2265 +0.2V\u4e3a\u903b\u8f911，VA-VB \u2264 -0.2V\u4e3a\u903b\u8f910\u3002<\/p>\n

\u5dee\u5206\u4f20\u8f93\u7684\u4f18\u52bf\u5728\u4e8e\u5f3a\u5927\u7684\u6297\u5171\u6a21\u5e72\u6270\u80fd\u529b\u3002\u566a\u58f0\u4f1a\u540c\u65f6\u5f71\u54cd\u4e24\u6761\u4fe1\u53f7\u7ebf，\u4f46\u7535\u538b\u5dee\u4fdd\u6301\u4e0d\u53d8，\u56e0\u6b64\u4fe1\u53f7\u80fd\u591f\u4fdd\u6301\u5b8c\u6574\u3002RS422\u652f\u6301\u5168\u53cc\u5de5\u901a\u4fe1，\u6709\u72ec\u7acb\u7684\u53d1\u9001\u548c\u63a5\u6536\u5dee\u5206\u5bf9，\u4f20\u8f93\u8ddd\u79bb\u53ef\u8fbe1200\u7c73（\u5728100kbps\u65f6）\u3002<\/p>\n

\u6211\u5728\u821e\u53f0\u706f\u5149\u63a7\u5236\u7cfb\u7edf\u4e2d\u7ecf\u5e38\u770b\u5230RS422\u7684\u8eab\u5f71，\u5b83\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u63a7\u5236\u5668\u5e26\u591a\u4e2a\u63a5\u6536\u5668\u7684\u5e7f\u64ad\u5f0f\u901a\u4fe1\u3002<\/p>\n

2.4 RS485：\u5de5\u4e1a\u603b\u7ebf\u7684\u4e3b\u6d41\u9009\u62e9<\/h4>\n

RS485\u53ef\u4ee5\u770b\u4f5c\u662fRS422\u7684\u589e\u5f3a\u7248，\u4e3b\u8981\u6539\u8fdb\u662f\u652f\u6301\u591a\u70b9\u53cc\u5411\u901a\u4fe1\u3002\u5b83\u91c7\u7528\u4e24\u7ebf\u5236\u534a\u53cc\u5de5\u65b9\u5f0f，\u6240\u6709\u8bbe\u5907\u5171\u4eab\u4e00\u5bf9\u5dee\u5206\u7ebf（A\u548cB），\u901a\u8fc7\u534f\u8bae\u4ef2\u88c1\u907f\u514d\u603b\u7ebf\u51b2\u7a81\u3002<\/p>\n

RS485\u7684\u7535\u6c14\u7279\u6027\u4e0eRS422\u57fa\u672c\u76f8\u540c，\u4f46\u9a71\u52a8\u80fd\u529b\u66f4\u5f3a，\u6700\u591a\u53ef\u4ee5\u652f\u630132\u4e2a\u751a\u81f3128\u4e2a\u8282\u70b9\u3002\u5b83\u9700\u8981\u5904\u7406\u603b\u7ebf\u4ef2\u88c1\u3001\u7ec8\u7aef\u7535\u963b\u5339\u914d\u7b49\u95ee\u9898，\u8fd9\u4e9b\u90fd\u662f\u6211\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u5fc5\u987b\u8003\u8651\u7684\u3002<\/p>\n

\u5b9e\u7528\u63d0\u793a：RS485\u603b\u7ebf\u4e24\u7aef\u5fc5\u987b\u5b89\u88c5120\u03a9\u7ec8\u7aef\u7535\u963b，\u5339\u914d\u7535\u7f06\u7279\u6027\u963b\u6297，\u6d88\u9664\u4fe1\u53f7\u53cd\u5c04\u3002\u4e2d\u95f4\u8282\u70b9\u4e0d\u5e94\u8be5\u5b89\u88c5\u7ec8\u7aef\u7535\u963b，\u5426\u5219\u4f1a\u5bfc\u81f4\u4fe1\u53f7\u8870\u51cf\u8fc7\u5927\u3002<\/p>\n

3. \u5b9e\u6218\u9009\u578b\u6307\u5357：\u6839\u636e\u5e94\u7528\u573a\u666f\u9009\u62e9\u6700\u4f73\u65b9\u6848<\/h3>\n

3.1 \u901a\u4fe1\u8ddd\u79bb\u51b3\u5b9a\u6280\u672f\u8def\u7ebf<\/h4>\n

\u901a\u4fe1\u8ddd\u79bb\u662f\u9009\u578b\u7684\u9996\u8981\u8003\u8651\u56e0\u7d20\u3002\u5728\u6211\u7684\u7ecf\u9a8c\u4e2d，\u53ef\u4ee5\u6309\u8ddd\u79bb\u8fd9\u6837\u5212\u5206：<\/p>\n

\u77ed\u8ddd\u79bb（<1\u7c73）：\u4f18\u5148\u9009\u62e9UART TTL\u3002\u8fd9\u662f\u6700\u7b80\u5355\u7ecf\u6d4e\u7684\u65b9\u6848，\u4e0d\u9700\u8981\u989d\u5916\u7684\u8f6c\u6362\u82af\u7247\u3002\u6bd4\u5982\u5355\u7247\u673a\u4e0e\u84dd\u7259\u6a21\u5757\u3001WiFi\u6a21\u5757\u7684\u8fde\u63a5\u3002<\/p>\n

\u4e2d\u8ddd\u79bb（1-15\u7c73）：\u8003\u8651RS232\u3002\u9002\u5408\u529e\u516c\u5ba4\u3001\u5b9e\u9a8c\u5ba4\u7b49\u76f8\u5bf9\u6d01\u51c0\u7684\u73af\u5883\u3002\u6bd4\u5982\u5de5\u63a7\u8bbe\u5907\u7684\u914d\u7f6e\u7aef\u53e3\u3001POS\u673a\u8fde\u63a5\u7b49\u3002<\/p>\n

\u957f\u8ddd\u79bb（15-1200\u7c73）：\u5fc5\u987b\u4f7f\u7528RS422\u6216RS485\u3002\u5de5\u4e1a\u73b0\u573a\u3001\u697c\u5b87\u81ea\u52a8\u5316\u7b49\u573a\u666f\u7684\u9996\u9009\u3002RS422\u9002\u5408\u70b9\u5bf9\u70b9\u6216\u5e7f\u64ad\u5e94\u7528，RS485\u9002\u5408\u591a\u8282\u70b9\u7f51\u7edc\u3002<\/p>\n

\u6211\u66fe\u7ecf\u53c2\u4e0e\u8fc7\u4e00\u4e2a\u5de5\u5382\u81ea\u52a8\u5316\u9879\u76ee，\u8bbe\u5907\u5206\u5e03\u5728\u6574\u4e2a\u8f66\u95f4，\u8ddd\u79bb\u8d85\u8fc7500\u7c73\u3002\u6211\u4eec\u9009\u62e9RS485\u7ec4\u7f51，\u7a33\u5b9a\u8fd0\u884c\u4e86\u591a\u5e74\u6ca1\u6709\u51fa\u73b0\u901a\u4fe1\u95ee\u9898\u3002<\/p>\n

3.2 \u8282\u70b9\u6570\u91cf\u4e0e\u62d3\u6251\u7ed3\u6784<\/h4>\n

\u8282\u70b9\u6570\u91cf\u76f4\u63a5\u5f71\u54cd\u534f\u8bae\u9009\u62e9：<\/p>\n

\u70b9\u5bf9\u70b9\u901a\u4fe1：UART TTL\u3001RS232\u3001RS422\u90fd\u53ef\u4ee5\u3002\u5982\u679c\u8ddd\u79bb\u8fd1\u5c31\u7528TTL，\u8ddd\u79bb\u4e2d\u7b49\u7528RS232，\u8ddd\u79bb\u8fdc\u4e14\u73af\u5883\u6076\u52a3\u7528RS422\u3002<\/p>\n

\u4e00\u5bf9\u591a\u5e7f\u64ad：RS422\u662f\u6700\u4f73\u9009\u62e9\u3002\u4e00\u4e2a\u53d1\u9001\u5668，\u591a\u4e2a\u63a5\u6536\u5668，\u6bd4\u5982\u663e\u793a\u7cfb\u7edf\u3001\u516c\u5171\u5e7f\u64ad\u7cfb\u7edf\u3002<\/p>\n

\u591a\u8282\u70b9\u7f51\u7edc：RS485\u662f\u552f\u4e00\u9009\u62e9\u3002\u652f\u6301\u591a\u4e2a\u8bbe\u5907\u5728\u603b\u7ebf\u4e0a\u901a\u4fe1，\u901a\u8fc7\u4e3b\u4ece\u534f\u8bae（\u5982Modbus）\u907f\u514d\u51b2\u7a81\u3002\u5de5\u4e1a\u63a7\u5236\u4e2d\u6700\u591a\u53ef\u4ee5\u8fde\u63a532\u4e2a\u8bbe\u5907，\u4f7f\u7528\u7279\u6b8a\u82af\u7247\u53ef\u4ee5\u6269\u5c55\u5230128\u751a\u81f3256\u4e2a\u3002<\/p>\n

\u5728\u5b9e\u9645\u7ec4\u7f51\u65f6，\u6211\u63a8\u8350\u91c7\u7528\u603b\u7ebf\u578b\u62d3\u6251，\u6240\u6709\u8bbe\u5907\u5e76\u8054\u5728\u603b\u7ebf\u4e0a\u3002\u661f\u578b\u6216\u6811\u578b\u62d3\u6251\u5bb9\u6613\u4ea7\u751f\u4fe1\u53f7\u53cd\u5c04，\u5f71\u54cd\u901a\u4fe1\u8d28\u91cf\u3002<\/p>\n

3.3 \u73af\u5883\u5e72\u6270\u4e0e\u53ef\u9760\u6027\u8981\u6c42<\/h4>\n

\u73af\u5883\u5e72\u6270\u7a0b\u5ea6\u662f\u9009\u578b\u7684\u5173\u952e\u56e0\u7d20：<\/p>\n

\u4f4e\u5e72\u6270\u73af\u5883：\u5b9e\u9a8c\u5ba4\u3001\u529e\u516c\u5ba4\u7b49\u53ef\u4ee5\u4f7f\u7528TTL\u6216RS232\u3002\u4f46\u8981\u6ce8\u610f\u907f\u5f00\u5f3a\u7535\u6e90\u7ebf\u3001\u7535\u673a\u7b49\u5e72\u6270\u6e90\u3002<\/p>\n

\u9ad8\u5e72\u6270\u73af\u5883：\u5de5\u5382\u8f66\u95f4\u3001\u6237\u5916\u7b49\u5fc5\u987b\u4f7f\u7528RS422\u6216RS485\u3002\u5dee\u5206\u4fe1\u53f7\u7684\u9ad8\u6297\u5e72\u6270\u80fd\u529b\u53ef\u4ee5\u4fdd\u8bc1\u901a\u4fe1\u53ef\u9760\u6027\u3002<\/p>\n

\u6211\u5728\u4e00\u4e2a\u53d8\u9891\u5668\u63a7\u5236\u9879\u76ee\u4e2d\u6df1\u6709\u4f53\u4f1a：\u6700\u521d\u5c1d\u8bd5\u7528RS232，\u901a\u4fe1\u7ecf\u5e38\u4e2d\u65ad；\u6539\u7528RS485\u540e，\u5373\u4f7f\u4e0e\u52a8\u529b\u7ebf\u5e76\u884c\u6577\u8bbe，\u901a\u4fe1\u4f9d\u7136\u7a33\u5b9a\u3002<\/p>\n

3.4 \u6210\u672c\u4e0e\u590d\u6742\u5ea6\u6743\u8861<\/h4>\n

\u6210\u672c\u8003\u8651\u4e0d\u4ec5\u8981\u770b\u786c\u4ef6\u6210\u672c，\u8fd8\u8981\u8003\u8651\u5f00\u53d1\u548c\u7ef4\u62a4\u6210\u672c：<\/p>\n

\u6700\u4f4e\u6210\u672c：UART TTL，\u51e0\u4e4e\u65e0\u989d\u5916\u6210\u672c，\u9002\u5408\u6d88\u8d39\u7c7b\u4ea7\u54c1\u3002<\/p>\n

\u4e2d\u7b49\u6210\u672c：RS232，\u9700\u8981\u7535\u5e73\u8f6c\u6362\u82af\u7247（\u5982MAX232），\u6bcf\u8282\u70b9\u589e\u52a0\u51e0\u5143\u6210\u672c\u3002<\/p>\n

\u8f83\u9ad8\u6210\u672c：RS422\/RS485，\u9700\u8981\u5dee\u5206\u6536\u53d1\u5668（\u5982MAX485），\u8fd8\u8981\u5904\u7406\u7ec8\u7aef\u7535\u963b\u3001\u603b\u7ebf\u4fdd\u62a4\u7b49\u95ee\u9898\u3002<\/p>\n

\u5bf9\u4e8e\u91cf\u4ea7\u7684\u4ea7\u54c1，\u6bcf\u5143\u6210\u672c\u90fd\u8981\u7cbe\u6253\u7ec6\u7b97\u3002\u4f46\u5982\u679c\u56e0\u4e3a\u7701\u6210\u672c\u800c\u9009\u62e9\u4e0d\u5408\u9002\u7684\u65b9\u6848，\u540e\u671f\u7684\u7ef4\u62a4\u6210\u672c\u53ef\u80fd\u4f1a\u66f4\u9ad8\u3002<\/p>\n

4. \u786c\u4ef6\u8bbe\u8ba1\u4e0e\u5b9e\u8df5\u6280\u5de7<\/h3>\n

4.1 \u7535\u5e73\u8f6c\u6362\u7535\u8def\u8bbe\u8ba1<\/h4>\n

UART TTL\u4e0e\u5176\u4ed6\u7535\u5e73\u6807\u51c6\u7684\u8f6c\u6362\u9700\u8981\u4e13\u95e8\u7684\u82af\u7247：<\/p>\n

TTL\u8f6cRS232：\u4f7f\u7528MAX232\u3001SP3232\u7b49\u82af\u7247\u3002\u8fd9\u4e9b\u82af\u7247\u5185\u90e8\u6709\u7535\u8377\u6cf5，\u53ef\u4ee5\u4ea7\u751fRS232\u6240\u9700\u7684\u6b63\u8d1f\u7535\u538b\u3002<\/p>\n

# Python\u4f7f\u7528pyserial\u8fdb\u884cRS232\u901a\u4fe1\u793a\u4f8b
\nimport serial<\/p>\n

# \u6253\u5f00\u4e32\u53e3
\nser = serial.Serial(
\n port='\/dev\/ttyUSB0',
\n baudrate=9600,
\n parity=serial.PARITY_NONE,
\n stopbits=serial.STOPBITS_ONE,
\n bytesize=serial.EIGHTBITS
\n)<\/p>\n

# \u53d1\u9001\u6570\u636e
\nser.write(b'Hello World')<\/p>\n

# \u63a5\u6536\u6570\u636e
\ndata = ser.read(10)
\nser.close()<\/p>\n

TTL\u8f6cRS422\/RS485：\u4f7f\u7528MAX485\u3001SN75176\u7b49\u5dee\u5206\u6536\u53d1\u5668\u3002\u9700\u8981\u6ce8\u610f\u4f7f\u80fd\u63a7\u5236，\u534a\u53cc\u5de5\u901a\u4fe1\u65f6\u53d1\u9001\u548c\u63a5\u6536\u4e0d\u80fd\u540c\u65f6\u8fdb\u884c\u3002<\/p>\n

\u6211\u5728\u8bbe\u8ba1RS485\u7535\u8def\u65f6，\u901a\u5e38\u4f1a\u52a0\u5165TVS\u7ba1\u548c\u81ea\u6062\u590d\u4fdd\u9669\u4e1d，\u4fdd\u62a4\u63a5\u53e3\u514d\u53d7\u96f7\u51fb\u548c\u6d6a\u6d8c\u635f\u5bb3\u3002<\/p>\n

4.2 \u5e03\u7ebf\u89c4\u8303\u4e0e\u63a5\u5730\u5904\u7406<\/h4>\n

\u6b63\u786e\u7684\u5e03\u7ebf\u662f\u4fdd\u8bc1\u901a\u4fe1\u53ef\u9760\u7684\u5173\u952e：<\/p>\n

\u7535\u7f06\u9009\u62e9：\u63a8\u8350\u4f7f\u7528\u53cc\u7ede\u7ebf，\u7ede\u5408\u5ea6\u8d8a\u9ad8\u6297\u5e72\u6270\u80fd\u529b\u8d8a\u5f3a\u3002\u5c4f\u853d\u53cc\u7ede\u7ebf\u5728\u6076\u52a3\u73af\u5883\u4e2d\u6548\u679c\u66f4\u597d\u3002<\/p>\n

\u63a5\u5730\u5904\u7406：\u5355\u7aef\u4fe1\u53f7（TTL\u3001RS232）\u9700\u8981\u4fdd\u8bc1\u5730\u7535\u4f4d\u4e00\u81f4，\u957f\u8ddd\u79bb\u65f6\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u9694\u79bb\u5668\u3002\u5dee\u5206\u4fe1\u53f7（RS422\u3001RS485）\u5bf9\u5730\u7535\u4f4d\u5dee\u5bb9\u5fcd\u5ea6\u8f83\u9ad8，\u4f46\u4e5f\u8981\u6ce8\u610f\u5171\u6a21\u7535\u538b\u8303\u56f4\u3002<\/p>\n

\u7ec8\u7aef\u7535\u963b：RS485\u603b\u7ebf\u4e24\u7aef\u5fc5\u987b\u5b89\u88c5120\u03a9\u7ec8\u7aef\u7535\u963b，\u4e2d\u95f4\u8282\u70b9\u4e0d\u5b89\u88c5\u3002\u9ad8\u901f\u6216\u957f\u8ddd\u79bb\u65f6，\u7535\u963b\u529f\u7387\u8981\u9002\u5f53\u52a0\u5927\u3002<\/p>\n

\u6211\u66fe\u7ecf\u9047\u5230\u4e00\u4e2aRS485\u7f51\u7edc\u901a\u4fe1\u4e0d\u7a33\u5b9a\u7684\u95ee\u9898，\u6700\u540e\u53d1\u73b0\u662f\u7ec8\u7aef\u7535\u963b\u529f\u7387\u4e0d\u8db3，\u957f\u65f6\u95f4\u5de5\u4f5c\u540e\u963b\u503c\u6f02\u79fb\u5bfc\u81f4\u7684\u3002<\/p>\n

4.3 \u5e38\u89c1\u6545\u969c\u6392\u67e5\u65b9\u6cd5<\/h4>\n

\u4e32\u884c\u901a\u4fe1\u6545\u969c\u6392\u67e5\u9700\u8981\u7cfb\u7edf\u7684\u65b9\u6cd5：<\/p>\n

\u9996\u5148\u68c0\u67e5\u786c\u4ef6\u8fde\u63a5：TX\/RX\u662f\u5426\u63a5\u53cd，\u5730\u7ebf\u662f\u5426\u8fde\u63a5，\u7ec8\u7aef\u7535\u963b\u662f\u5426\u6b63\u786e\u5b89\u88c5\u3002<\/p>\n

\u7136\u540e\u68c0\u67e5\u53c2\u6570\u8bbe\u7f6e：\u6ce2\u7279\u7387\u3001\u6570\u636e\u4f4d\u3001\u505c\u6b62\u4f4d\u3001\u6821\u9a8c\u4f4d\u662f\u5426\u4e00\u81f4\u3002\u6211\u5efa\u8bae\u5148\u75289600bps\u7b49\u6807\u51c6\u6ce2\u7279\u7387\u6d4b\u8bd5\u3002<\/p>\n

\u6700\u540e\u68c0\u67e5\u4fe1\u53f7\u8d28\u91cf：\u7528\u793a\u6ce2\u5668\u89c2\u5bdf\u4fe1\u53f7\u6ce2\u5f62，\u770b\u662f\u5426\u6709\u5931\u771f\u3001\u8fc7\u51b2\u3001\u632f\u94c3\u7b49\u73b0\u8c61\u3002<\/p>\n

\u7ecf\u9a8c\u5206\u4eab：RS485\u7f51\u7edc\u6545\u969c90%\u4ee5\u4e0a\u662f\u63a5\u7ebf\u95ee\u9898\u3002\u6211\u66fe\u7ecf\u82b1\u4e86\u4e24\u5929\u65f6\u95f4\u6392\u67e5\u4e00\u4e2a\u901a\u4fe1\u95ee\u9898，\u6700\u540e\u53d1\u73b0\u662f\u4e00\u4e2a\u8282\u70b9\u7684A\u3001B\u7ebf\u63a5\u53cd\u4e86\u3002<\/p>\n

5. \u8f6f\u4ef6\u534f\u8bae\u4e0e\u6570\u636e\u683c\u5f0f<\/h3>\n

5.1 \u6570\u636e\u5e27\u683c\u5f0f\u914d\u7f6e<\/h4>\n

UART\u7684\u6570\u636e\u5e27\u683c\u5f0f\u9700\u8981\u901a\u4fe1\u53cc\u65b9\u4e00\u81f4\u914d\u7f6e：<\/p>\n

\u6ce2\u7279\u7387：\u4ece300bps\u52303Mbps\u4e0d\u7b49\u3002\u5e38\u75289600\u3001115200\u7b49\u6807\u51c6\u503c\u3002\u8d8a\u9ad8\u901f\u5ea6\u5bf9\u786c\u4ef6\u8981\u6c42\u8d8a\u9ad8\u3002<\/p>\n

\u6570\u636e\u4f4d：5-9\u4f4d，\u901a\u5e38\u75288\u4f4d（\u4e00\u4e2a\u5b57\u8282）\u30027\u4f4d\u7528\u4e8eASCII\u5b57\u7b26\u4f20\u8f93\u3002<\/p>\n

\u6821\u9a8c\u4f4d：\u5947\u6821\u9a8c\u3001\u5076\u6821\u9a8c\u6216\u65e0\u6821\u9a8c\u3002\u6821\u9a8c\u80fd\u53d1\u73b0\u5355\u6bd4\u7279\u9519\u8bef，\u4f46\u4e0d\u80fd\u7ea0\u6b63\u3002<\/p>\n

\u505c\u6b62\u4f4d：1\u4f4d\u30011.5\u4f4d\u62162\u4f4d\u3002\u901a\u5e38\u75281\u4f4d\u3002<\/p>\n

\u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u6211\u5efa\u8bae\u4f7f\u75288\u6570\u636e\u4f4d\u3001\u65e0\u6821\u9a8c\u30011\u505c\u6b62\u4f4d（8N1）\u7684\u914d\u7f6e，\u8fd9\u662f\u6700\u5e38\u7528\u7684\u683c\u5f0f\u3002<\/p>\n

5.2 \u5e94\u7528\u5c42\u534f\u8bae\u8bbe\u8ba1<\/h4>\n

\u5728\u7269\u7406\u5c42\u4e4b\u4e0a，\u8fd8\u9700\u8981\u5e94\u7528\u5c42\u534f\u8bae\u6765\u7ec4\u7ec7\u6570\u636e：<\/p>\n

Modbus RTU：\u5de5\u4e1a\u9886\u57df\u6700\u5e38\u7528\u7684\u534f\u8bae，\u7b80\u5355\u53ef\u9760\u3002\u91c7\u7528\u4e3b\u4ece\u95ee\u7b54\u6a21\u5f0f\u3002<\/p>\n

\u81ea\u5b9a\u4e49\u534f\u8bae：\u6839\u636e\u5e94\u7528\u9700\u6c42\u8bbe\u8ba1\u7b80\u5355\u9ad8\u6548\u7684\u534f\u8bae\u3002\u901a\u5e38\u5305\u62ec\u5e27\u5934\u3001\u5730\u5740\u3001\u547d\u4ee4\u3001\u6570\u636e\u3001\u6821\u9a8c\u548c\u7b49\u5b57\u6bb5\u3002<\/p>\n

\u6211\u5728\u8bbe\u8ba1\u81ea\u5b9a\u4e49\u534f\u8bae\u65f6，\u4f1a\u52a0\u5165\u8d85\u65f6\u91cd\u53d1\u3001\u5e8f\u53f7\u786e\u8ba4\u3001CRC\u6821\u9a8c\u7b49\u673a\u5236，\u63d0\u9ad8\u901a\u4fe1\u53ef\u9760\u6027\u3002<\/p>\n

\/\/ Modbus RTU CRC16\u8ba1\u7b97\u793a\u4f8b
\nuint16_t Modbus_CRC16(uint8_t *data, uint16_t length) {
\n uint16_t crc = 0xFFFF;
\n for (uint16_t i = 0; i < length; i++) {
\n crc ^= data[i];
\n for (uint8_t j = 0; j < 8; j++) {
\n if (crc & 0x0001) {
\n crc = (crc >> 1) ^ 0xA001;
\n } else {
\n crc = crc >> 1;
\n }
\n }
\n }
\n return crc;
\n}<\/p>\n

5.3 \u6d41\u91cf\u63a7\u5236\u4e0e\u9519\u8bef\u5904\u7406<\/h4>\n

\u53ef\u9760\u7684\u901a\u4fe1\u9700\u8981\u5b8c\u5584\u7684\u9519\u8bef\u5904\u7406\u673a\u5236：<\/p>\n

\u8d85\u65f6\u91cd\u53d1：\u8bbe\u7f6e\u5408\u7406\u7684\u8d85\u65f6\u65f6\u95f4，\u8d85\u65f6\u540e\u91cd\u53d1\u6570\u636e\u5305\u3002\u91cd\u53d1\u6b21\u6570\u901a\u5e38\u4e3a3\u6b21\u3002<\/p>\n

\u5e8f\u53f7\u786e\u8ba4：\u4e3a\u6bcf\u4e2a\u6570\u636e\u5305\u5206\u914d\u5e8f\u53f7，\u63a5\u6536\u65b9\u786e\u8ba4\u540e\u53d1\u9001\u4e0b\u4e00\u4e2a\u5305\u3002<\/p>\n

\u6d41\u91cf\u63a7\u5236：\u4f7f\u7528\u786c\u4ef6\u6d41\u63a7（RTS\/CTS）\u6216\u8f6f\u4ef6\u6d41\u63a7（XON\/XOFF）\u907f\u514d\u6570\u636e\u4e22\u5931\u3002<\/p>\n

\u6211\u5728\u5904\u7406\u9ad8\u901f\u6570\u636e\u91c7\u96c6\u65f6，\u66fe\u7ecf\u56e0\u4e3a\u7f3a\u5c11\u6d41\u91cf\u63a7\u5236\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u3002\u540e\u6765\u52a0\u5165RTS\/CTS\u786c\u4ef6\u6d41\u63a7\u540e\u95ee\u9898\u5f97\u5230\u89e3\u51b3\u3002<\/p>\n

6. \u5178\u578b\u5e94\u7528\u573a\u666f\u4e0e\u6848\u4f8b\u89e3\u6790<\/h3>\n

6.1 \u5de5\u4e1a\u63a7\u5236\u7cfb\u7edf<\/h4>\n

\u5de5\u4e1a\u63a7\u5236\u662fRS485\u7684\u4e3b\u8981\u5e94\u7528\u9886\u57df\u3002\u6211\u53c2\u4e0e\u8fc7\u4e00\u4e2a\u6c61\u6c34\u5904\u7406\u5382\u81ea\u52a8\u5316\u9879\u76ee，\u4f7f\u7528RS485\u7ec4\u5efaModbus\u7f51\u7edc：<\/p>\n

\u7f51\u7edc\u7ed3\u6784：\u4e3b\u7ad9\u662f\u5de5\u63a7\u673a，\u4ece\u7ad9\u5305\u62ecPLC\u3001\u53d8\u9891\u5668\u3001\u4eea\u8868\u7b4932\u4e2a\u8bbe\u5907\u3002<\/p>\n

\u901a\u4fe1\u53c2\u6570：19200bps，8\u6570\u636e\u4f4d，\u5076\u6821\u9a8c，1\u505c\u6b62\u4f4d\u3002\u8ddd\u79bb\u6700\u957f\u7ea6800\u7c73\u3002<\/p>\n

\u5b9e\u65bd\u8981\u70b9：\u4f7f\u7528\u5c4f\u853d\u53cc\u7ede\u7ebf，\u603b\u7ebf\u4e24\u7aef\u5b89\u88c5120\u03a9\u7ec8\u7aef\u7535\u963b，\u6bcf\u4e2a\u8282\u70b9\u52a0\u5165\u9632\u96f7\u4fdd\u62a4\u3002<\/p>\n

\u8fd9\u4e2a\u7cfb\u7edf\u5df2\u7ecf\u7a33\u5b9a\u8fd0\u884c\u4e865\u5e74\u591a，\u8bc1\u660e\u4e86RS485\u5728\u5de5\u4e1a\u73af\u5883\u4e2d\u7684\u53ef\u9760\u6027\u3002<\/p>\n

6.2 \u697c\u5b87\u81ea\u52a8\u5316<\/h4>\n

\u697c\u5b87\u81ea\u52a8\u5316\u7cfb\u7edf\u901a\u5e38\u8986\u76d6\u6574\u4e2a\u5efa\u7b51，\u8ddd\u79bb\u957f\u3001\u8282\u70b9\u591a：<\/p>\n

\u5178\u578b\u5e94\u7528：\u7a7a\u8c03\u63a7\u5236\u3001\u7167\u660e\u63a7\u5236\u3001\u95e8\u7981\u7cfb\u7edf\u3001\u5b89\u9632\u76d1\u63a7\u7b49\u3002<\/p>\n

\u6280\u672f\u9009\u62e9：RS485\u662f\u4e3b\u6d41\u9009\u62e9，\u652f\u6301\u591a\u8282\u70b9\u3001\u957f\u8ddd\u79bb\u4f20\u8f93\u3002BACnet MS\/TP\u7b49\u534f\u8bae\u57fa\u4e8eRS485\u3002<\/p>\n

\u5b9e\u65bd\u7ecf\u9a8c：\u5206\u533a\u7ec4\u7f51，\u6bcf\u5c42\u6216\u6bcf\u533a\u4e00\u4e2a\u5b50\u7f51，\u901a\u8fc7\u7f51\u5173\u4e92\u8054\u3002\u907f\u514d\u5355\u4e00\u603b\u7ebf\u8282\u70b9\u8fc7\u591a\u3002<\/p>\n

6.3 \u5d4c\u5165\u5f0f\u8bbe\u5907\u8c03\u8bd5<\/h4>\n

UART TTL\u662f\u5d4c\u5165\u5f0f\u5f00\u53d1\u4e2d\u6700\u5e38\u7528\u7684\u8c03\u8bd5\u63a5\u53e3：<\/p>\n

\u4f7f\u7528\u65b9\u5f0f：\u901a\u8fc7USB-TTL\u8f6c\u6362\u5668\u8fde\u63a5\u7535\u8111\u548c\u76ee\u6807\u677f\u3002<\/p>\n

\u8c03\u8bd5\u5de5\u5177：Putty\u3001SecureCRT\u3001\u4e32\u53e3\u8c03\u8bd5\u52a9\u624b\u7b49\u3002<\/p>\n

\u6280\u5de7\u5206\u4eab：\u5728\u4ee3\u7801\u4e2d\u52a0\u5165printf\u8f93\u51fa\u8c03\u8bd5\u4fe1\u606f，\u6bd4\u786c\u4ef6\u8c03\u8bd5\u5668\u66f4\u65b9\u4fbf\u3002\u6211\u66fe\u7ecf\u7528\u8fd9\u79cd\u65b9\u6cd5\u89e3\u51b3\u4e86\u5f88\u591a\u7591\u96be\u6742\u75c7\u3002<\/p>\n

7. \u5e38\u89c1\u95ee\u9898\u4e0e\u89e3\u51b3\u65b9\u6848<\/h3>\n

\u5728\u5b9e\u9645\u9879\u76ee\u4e2d，\u6211\u9047\u5230\u8fc7\u5404\u79cd\u4e32\u884c\u901a\u4fe1\u95ee\u9898，\u603b\u7ed3\u4e86\u4e00\u4e9b\u5e38\u89c1\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6cd5：<\/p>\n

\u901a\u4fe1\u5b8c\u5168\u4e0d\u901a：\u68c0\u67e5\u7535\u6e90\u3001\u5730\u7ebf\u8fde\u63a5；\u786e\u8ba4TX\/RX\u6ca1\u6709\u63a5\u53cd；\u9a8c\u8bc1\u6ce2\u7279\u7387\u8bbe\u7f6e\u3002<\/p>\n

\u968f\u673a\u8bef\u7801：\u68c0\u67e5\u63a5\u5730\u662f\u5426\u826f\u597d；\u786e\u8ba4\u7ec8\u7aef\u7535\u963b\u662f\u5426\u6b63\u786e\u5b89\u88c5；\u907f\u5f00\u5e72\u6270\u6e90\u3002<\/p>\n

\u901a\u4fe1\u8ddd\u79bb\u77ed：\u68c0\u67e5\u7535\u7f06\u8d28\u91cf；\u786e\u8ba4\u6ce2\u7279\u7387\u662f\u5426\u8fc7\u9ad8；\u68c0\u67e5\u7ec8\u7aef\u7535\u963b\u3002<\/p>\n

\u591a\u8282\u70b9\u51b2\u7a81：\u68c0\u67e5\u534f\u8bae\u5b9e\u73b0\u662f\u5426\u6b63\u786e；\u786e\u8ba4\u603b\u7ebf\u4ef2\u88c1\u673a\u5236；\u52a0\u5165\u8d85\u65f6\u91cd\u8bd5\u3002<\/p>\n

\u6211\u66fe\u7ecf\u9047\u5230\u4e00\u4e2a\u5947\u602a\u7684\u95ee\u9898：RS485\u7f51\u7edc\u5728\u767d\u5929\u5de5\u4f5c\u6b63\u5e38，\u665a\u4e0a\u7ecf\u5e38\u51fa\u9519\u3002\u6700\u540e\u53d1\u73b0\u662f\u665a\u4e0a\u7535\u538b\u5347\u9ad8，\u5bfc\u81f4\u67d0\u4e2a\u8282\u70b9\u7684\u4fdd\u62a4\u4e8c\u6781\u7ba1\u6f0f\u7535\u3002\u66f4\u6362\u8010\u538b\u66f4\u9ad8\u7684\u5668\u4ef6\u540e\u95ee\u9898\u89e3\u51b3\u3002<\/p>\n

\u53e6\u4e00\u4e2a\u5e38\u89c1\u95ee\u9898\u662f\u5730\u73af\u8def\u5e72\u6270\u3002\u5728\u957f\u8ddd\u79bb\u901a\u4fe1\u4e2d，\u5730\u7535\u4f4d\u5dee\u53ef\u80fd\u8fbe\u5230\u51e0\u4f0f\u751a\u81f3\u51e0\u5341\u4f0f\u3002\u89e3\u51b3\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u9694\u79bb\u5668\u3001\u91c7\u7528\u5dee\u5206\u4fe1\u53f7\u3001\u4f7f\u7528\u5149\u7ea4\u8f6c\u6362\u5668\u7b49\u3002<\/p>\n

\u5bf9\u4e8eRS485\u7f51\u7edc，\u6211\u5efa\u8bae\u5b9a\u671f\u68c0\u67e5\u603b\u7ebf\u963b\u6297\u548c\u7ec8\u7aef\u7535\u963b\u3002\u73af\u5883\u6e29\u5ea6\u53d8\u5316\u53ef\u80fd\u5bfc\u81f4\u7535\u963b\u503c\u6f02\u79fb，\u5f71\u54cd\u4fe1\u53f7\u8d28\u91cf\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

1. \u4e32\u884c\u901a\u4fe1\u57fa\u7840：\u4eceUART\u534f\u8bae\u5230\u7535\u5e73\u6807\u51c6
\n\u4e32\u884c\u901a\u4fe1\u662f\u5d4c\u5165\u5f0f\u7cfb\u7edf\u548c\u5de5\u4e1a\u63a7\u5236\u4e2d\u6700\u57fa\u7840\u7684\u901a\u4fe1\u65b9\u5f0f\u4e4b\u4e00\u3002\u6211\u521a\u5f00\u59cb\u63a5\u89e6\u8fd9\u4e2a\u9886\u57df\u65f6，\u4e5f\u88abUART\u3001TTL\u3001RS232\u3001RS422\u3001RS485\u8fd9\u4e9b\u672f\u8bed\u641e\u5f97\u5934\u6655\u773c\u82b1\u3002\u540e\u6765\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u8e29\u8fc7\u4e0d\u5c11\u5751，\u624d\u6162\u6162\u7406\u6e05\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u3002
\n\u7b80\u5355\u6765\u8bf4，UART（\u901a\u7528\u5f02\u6b65\u6536\u53d1\u5668）\u662f\u901a\u4fe1\u534f\u8bae\u7684\\”\u5927\u8111\\”，\u8d1f\u8d23\u6570\u636e\u7684\u6253\u5305\u548c\u89e3\u5305\u3002\u5b83\u5b9a\u4e49\u4e86\u6570\u636e\u5e27\u7684\u683c\u5f0f：\u8d77\u59cb\u4f4d\u3001<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7880,7915,7916,1216],"topic":[],"class_list":["post-74687","post","type-post","status-publish","format-standard","hentry","category-server","tag-uart","tag-7915","tag-7916","tag-rs485"],"yoast_head":"\n\u4eceUART\u5230RS485\uff1a\u4e32\u884c\u901a\u4fe1\u534f\u8bae\u4e0e\u7535\u5e73\u6807\u51c6\u7684\u5b9e\u6218\u9009\u578b\u6307\u5357 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/74687.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4eceUART\u5230RS485\uff1a\u4e32\u884c\u901a\u4fe1\u534f\u8bae\u4e0e\u7535\u5e73\u6807\u51c6\u7684\u5b9e\u6218\u9009\u578b\u6307\u5357 - 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