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fuli187
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樓主  發(fā)表于: 2008-03-28 15:04
圖片：
本人從網(wǎng)上找的PPI的接線(xiàn)圖
說(shuō)明:RS485的 3和8腳上串個(gè)電阻:RF70后,就不會(huì )燒串口了.
gaoren
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1樓  發(fā)表于: 2008-08-30 12:03
怎么電阻多在啊

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