此电缆的说明Port2,下方的接口是RS485连接，访间此接口需要15针的D型连接器，此连接器是插孔连接器.串口状态指示灯CPU351和CPU352有三个指示CPU串口当前状态的指示灯.在CPU351和CPU3S2.上的SNP指示灯在CPU363中被称作PS接口

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