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一世天藍
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樓主  發(fā)表于: 2014-09-06 00:01
如題，請問(wèn)各位老師，我看200的資料，發(fā)現I/O口的接線(xiàn)有的是負極接M端，有的是正極接M端。請問(wèn)下它的依據是什么。。書(shū)上說(shuō)一種是匯點(diǎn)輸入，另一種是源輸入，但是沒(méi)有具體的解釋。麻煩各位老師幫我解一下惑，謝謝！

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