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vitality8
沒(méi)有最好，只有更好！因為專(zhuān)業(yè)，所以更好！
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樓主  發(fā)表于: 2012-08-21 14:42
眾所周知，三菱FX系列485-BD模塊是屬于4線(xiàn)制的(如下圖的FX2N-485-BD)；即有RDA、 RDB、SDA、SDB 對于它跟三菱本品牌的設備在此不做說(shuō)明。而我們常見(jiàn)的設備都是2線(xiàn)制的（+、-或A、B定義），這可能就有人問(wèn)了是不是他們就沒(méi)法通信了，其實(shí)它產(chǎn)的接線(xiàn)也是很簡(jiǎn)單，把發(fā)送SDA和接收RDA接起來(lái)接到你設備的A(+)  發(fā)送的SDB和接收RDB接起來(lái)接到你設備的B(-)
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aojianyun121
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1樓  發(fā)表于: 2012-09-02 10:37
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