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COM\u53e3\u662f\u4e0d\u662fRS232\uff1f<\/h2>\n

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  COM\u53e3\u548cRS232\u7684\u533a\u522b<\/h3>\n

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  COM\u53e3\u4e0eRS232\u7684\u5e94\u7528<\/h3>\n

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