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cwm0848
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樓主  發(fā)表于: 2017-12-09 21:26
描述：我采用的連線(xiàn)方式
圖片：
請教各位大神，我有一臺FX2N和485BD板和一臺三菱E740變頻器，想通過(guò)485BD和變頻器的PU口連接控制變頻器，不知道485BD和PU口怎么連線(xiàn)，是采用四線(xiàn)直連還是采用兩線(xiàn)交叉連接。編程用RS通信指令。謝謝，初次接觸通信這一塊，請大神解說(shuō)詳細點(diǎn)。萬(wàn)分感謝。我采用了四線(xiàn)直連方式?jīng)]反應，好像沒(méi)有連上。附件里是我采用的連線(xiàn)方式。
hongsenmu
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1樓  發(fā)表于: 2017-12-10 08:21
RDA/SDA短接，RDB/SDB短接。距離不長(cháng)可不用終端電阻

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