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\n\u00a0\u00a0\u00a0 \u670d\u52d9\u5668\u4e0d\u9023\u63a5\u9375\u76e4\u3001\u9f20\u6a19\u548c\u986f\u793a\u5668\u7684\u597d\u8655\u662f\u975e\u5e38\u65b9\u4fbf\uff0c\u56e0\u70ba\u670d\u52d9\u5668\u5c07\u53ea\u662f\u58f9\u500b\u7c21\u55ae\u7684\u4e3b\u6a5f\u7bb1\uff0c\u53ef\u4ee5\u653e\u5728\u4efb\u4f55\u9069\u5408\u7684\u5730\u65b9\u3002\u4f46\u6709\u6642\u5019\u59b3\u53ef\u80fd\u5e0c\u671b\u80fd\u6709\u58f9\u500b\u6309\u9375\u4f86\u5be6\u73fe\u5b89\u5168\u7684\u95dc\u9589\u670d\u52d9\u5668\u800c\u7121\u9700\u9996\u5148\u9060\u7a0b\u767b\u9304\u670d\u52d9\u5668\u904b\u884cshutdown\u547d\u4ee4\u4f86\u5be6\u73fe\u95dc\u9589\u6a5f\u5668\u3002\u4e5f\u53ef\u80fd\u59b3\u73fe\u5728\u5c31\u5728\u670d\u52d9\u5668\u6a5f\u623f\uff0c\u800c\u6700\u8fd1\u7684\u5de5\u4f5c\u7ad9\u96e2\u59b3\u6709100\u591a\u7c73\u9060\uff1b\u6216\u8005\u59b3\u5e0c\u671b\u67d0\u500b\u6c92\u6709root\u5bc6\u78bc\u7684\u666e\u901a\u7528\u6236\u95dc\u9589\u670d\u52d9\u5668\u3002\u7576\u7136\u76f4\u63a5\u95dc\u9589\u96fb\u6e90\u4e26\u4e0d\u662f\u58f9\u500b\u597d\u7684\u60f3\u6cd5\uff0c\u56e0\u70ba\u9019\u6a23\u53ef\u80fd\u5c0e\u81f4\u4e1f\u5931\u6578\u64da\u4e26\u4e14\u5728\u4e0b\u6b21\u555f\u52d5\u6642\u9700\u8981\u5f88\u9577\u6642\u9593\u7684\u6587\u4ef6\u7cfb\u7d71\u6aa2\u6e2c\u3002
\n\u00a0\u00a0\u00a0 \u89e3\u6c7a\u65b9\u6cd5\u662f\u6309\u7167\u672c\u6587\u7684\u65b9\u6cd5\u5b89\u88dd\u58f9\u500b\u5f88\u5c0f\u7684\u3001\u4fbf\u5b9c\u7684\u4e32\u53e3\u8a2d\u5099\u5be6\u73fe\u5b89\u5168\u95dc\u6a5f\u3002
\n\u00a0\u00a0\u00a0 \u8a2d\u5099
\n\u00a0\u00a0\u00a0 \u6211\u5011\u5c07\u5236\u4f5c\u58f9\u500b\u5c0f\u5c0f\u7684\u3001\u7531\u5169\u500bLED\u548c\u58f9\u500b\u6309\u9375\u5f0f\u958b\u95dc\u7d44\u6210\u7684\u8a2d\u5099\u3002\u5176\u4e2d\u7da0\u8272\u7684LED\u4eae\u8868\u793a\u7576\u524d\u6309\u9375\u5f0f\u958b\u95dc\u662f\u8655\u65bc\u6fc0\u6d3b\u72c0\u614b\uff0c\u7de9\u6162\u9583\u720d\u7684\u9ec3\u8272LED\u71c8\u8868\u793a\u670d\u52d9\u5668\u6b63\u5728\u555f\u52d5\u6216\u8005\u4ecd\u7136\u8655\u65bc\u95dc\u9589\u72c0\u614b\u3002\u70ba\u4e86\u5be6\u73fe\u5b89\u5168\u95dc\u9589\u670d\u52d9\u5668\u9700\u8981\u6301\u7e8c\u6309\u4e0b\u958b\u95dc3\u79d2\u9418\u3002
\n\u00a0\u00a0\u00a0 \u5982\u679c\u59b3\u6309\u4e86\u6309\u9375\u958b\u95dc\uff0c\u4eae\u8457\u7684\u7da0\u8272\u7684LED\u5c07\u7184\u6ec5\uff0c\u8868\u793a\u6b63\u5728\u95dc\u6a5f\uff0c\u9019\u6642\u5019\u547d\u4ee4”\/sbin\/shutdown -t2 -h now”\u88ab\u57f7\u884c\u3002\u5728\u670d\u52d9\u5668\u95dc\u9589\u904e\u7a0b\u4e2d\u9ec3\u8272\u7684LED\u5c07\u9023\u7e8c\u9583\u720d\u4ee5\u9032\u884c\u6307\u793a\u3002\u7576\u9ec3\u8272LED\u4e0d\u518d\u9583\u720d\u6642\uff0c\u59b3\u4ecd\u7136\u9700\u8981\u7b49\u5f8510\u79d2\u9418\u624d\u80fd\u95dc\u9589\u670d\u52d9\u5668\u96fb\u6e90\u3002\u7576\u6240\u6709\u7684\u9032\u7a0b\u88ab\u6bba\u6389\uff0c\u78c1\u76e4\u88ab\u5378\u8f09\u4ee5\u5f8c\u9ec3\u8272LED\u5c07\u4e0d\u518d\u9583\u720d\u3002\u82e5\u59b3\u7684\u670d\u52d9\u5668\u652f\u6301\u81ea\u52d5\u95dc\u6a5f\u5247\u59b3\u4e0d\u9700\u8981\u8003\u616e10\u79d2\u7684\u7b49\u5f85\u6642\u9593\uff0c\u56e0\u70ba\u670d\u52d9\u5668\u6703\u81ea\u52d5\u95dc\u9589\u96fb\u6e90\u3002
\n\u00a0\u00a0\u00a0 \u4e32\u53e3
\n\u00a0\u00a0\u00a0 \u95dc\u65bc\u4e32\u53e3\u4ee4\u4eba\u611f\u8208\u8da3\u7684\u662f\u6211\u5011\u53ef\u4ee5\u901a\u904eioctl\u7cfb\u7d71\u8abf\u7528\u4f86\u63a7\u5236\u5176\u4e2d\u7684\u5e7e\u500b\u7ba1\u8173\u3002\u9019\u610f\u5473\u8457\u59b3\u4e0d\u9700\u8981\u4fee\u6539\u4efb\u4f55\u5167\u6838\u4ee3\u78bc\u5c31\u53ef\u4ee5\u63a7\u5236\u9023\u63a5\u5230\u4e32\u53e3\u7684LED\u6216\u9019\u8b80\u53d6\u6309\u9375\u5f0f\u958b\u95dc\u7684\u72c0\u614b\u3002\u4e32\u53e3\u6709\u8db3\u5920\u7684\u96fb\u58d3\u4f86\u9a45\u52d5\u5169\u500b\u4f4e\u96fb\u58d3LED\u3002\u6211\u5011\u5c07\u4f7f\u7528RTS\u548cDTR\u91dd\u4f86\u9023\u63a5LED\uff0c\u4e26\u4e14”Carrier Detect line”\u88ab\u7528\u4f86\u8b80\u53d6\u6309\u9375\u958b\u95dc\u7684\u72c0\u614b\u3002
\n\u00a0\u00a0\u00a0 \u4e32\u53e3\u6bcd\u982d\u9023\u63a5\u5668\u7684\u7ba1\u8173\u5b9a\u7fa9\uff1a
\n\u00a0\u00a0\u00a0 9 PIN-connector 25 PIN-connector Name Dir Description
\n\u00a0\u00a0\u00a0 1 8 CD input Carrier Detect
\n\u00a0\u00a0\u00a0 2 3 RXD input Receive Data
\n\u00a0\u00a0\u00a0 3 2 TXD output Transmit Data
\n\u00a0\u00a0\u00a0 4 20 DTR output Data Terminal Ready
\n\u00a0\u00a0\u00a0 5 7 GND — System Ground
\n\u00a0\u00a0\u00a0 6 6 DSR input Data Set Ready
\n\u00a0\u00a0\u00a0 7 4 RTS output Request to Send
\n\u00a0\u00a0\u00a0 8 5 CTS input Clear to Send
\n\u00a0\u00a0\u00a0 9 22 RI input Ring Indicator
\n\u00a0\u00a0\u00a0 \u96fb\u8def
\n\u00a0\u00a0\u00a0 \u7528\u6236\u9700\u8981\u4e0b\u9762\u5143\u5668\u4ef6\u4f86\u5236\u4f5c\u9019\u500b\u4e32\u53e3\u95dc\u6a5f\u8a2d\u5099\uff1a
\n\u00a0\u00a0\u00a0 1 \u7da0\u8272\u4f4e\u96fb\u58d3LED \uff08\u58f9\u500b\u666e\u901aLED\u540c\u6a23\u53ef\u4ee5\u5de5\u4f5c\uff0c\u4f46\u662f\u4eae\u71c8\u904e\u4f4e\uff09
\n\u00a0\u00a0\u00a0 1 \u9ec3\u8272\u4f4e\u96fb\u58d3LED
\n\u00a0\u00a0\u00a0 2 1.5K\u6b50\u59c6\u7684\u96fb\u963b
\n\u00a0\u00a0\u00a0 1 6.8K\u6b50\u59c6\u7684\u96fb\u963b
\n\u00a0\u00a0\u00a0 1 \u5c0f\u6309\u9375\u958b\u95dc
\n\u00a0\u00a0\u00a0 1 \u4e32\u53e3\u6bcd\u982d\u9023\u63a5\u5668
\n\u00a0\u00a0\u00a0 \u9019\u4e9b\u5143\u5668\u4ef6\u6309\u7167\u5982\u4e0b\u7684\u96fb\u8def\u5716\u9023\u63a5\u5728\u58f9\u8d77\u3002\u4e32\u53e3\u96fb\u58d3\u7bc4\u570d\u662f+\/- 10\u4f0f\u7279\u30021.5K\u96fb\u963b\u9069\u5408\u65bc\u4f4e\u96fb\u58d3\u7684LED\uff0c\u4f46\u662f\u666e\u901aLED\u540c\u6a23\u9069\u5408\u3002\u4e0d\u63a8\u85a6\u4fee\u6539\u96fb\u963b\u5668\u96fb\u58d3\u548c\u4f7f\u7528\u5916\u90e8\u96fb\u6e90\uff0c\u56e0\u70ba\u4e32\u53e3\u63a7\u5236\u82af\u7247\u662f\u4e3b\u677f\u7684\u58f9\u90e8\u5206\uff0c\u58f9\u65e6\u59b3\u71d2\u4e86\u5176\u4e2d\u7684\u82af\u7247\uff0c\u59b3\u53ea\u6709\u4fee\u6539\u6574\u500b\u4e3b\u677f\u3002
\n\u00a0\u00a0\u00a0 \u4e0a\u5716\u662f\u5be6\u969b\u7684\u96fb\u8def\u677f\u6a23\u54c1\u5716\u3002\u6700\u5f8c\u7684\u8a2d\u5099\u5982\u6587\u7ae0\u958b\u59cb\u5716\u7247\u6240\u793a\u3002
\n\u00a0\u00a0\u00a0 \u8edf\u4ef6
\n\u00a0\u00a0\u00a0 \u8edf\u4ef6\u90e8\u5206\u662f\u58f9\u500b\u5c0f\u7684\u5b88\u8b77\u9032\u7a0b\u3002\u5b83\u53ef\u4ee5\u901a\u904e\/etc\/rc.d\/rc3.d\/\u7684\u8173\u672c\u88ab\u555f\u52d5\u3002\u5b83\u901a\u904e\u4f7f\u7528ioctl\uff08fd, TIOCMSET,\u2026\uff09\u548cioctl\uff08fd, TIOCMGET, \u2026\uff09\u51fd\u6578\u4f86\u8b80\u53d6\u548c\u5beb\u4e32\u53e3\u3002\u59b3\u53ef\u4ee5\u5f9e\u9019\u88cf\u4e0b\u8f09\u7a0b\u5e8f\u3002\u8edf\u4ef6\u4e2d\u5305\u542b\u58f9\u500bMakefile\u548c\u5b89\u88dd\u6307\u793a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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