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張國良
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樓主  發(fā)表于: 2020-05-08 07:19
圖片：
圖片：
剛開(kāi)始我用的觸摸屏的串口是485的，跟plc 通訊不上，改成422的居然通訊成功了，可是plc 還是485的通訊啊。這是什么個(gè)情況
tkggtdkjpl
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1樓  發(fā)表于: 2020-05-08 13:02
422也叫4線(xiàn)制485      485通常說(shuō)的2線(xiàn)制
你PLC那里明明寫(xiě)的422
樓主留言：
H /W 類(lèi)型不是寫(xiě)的485嗎
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