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TSS721搭接的MBUS从机电路和主机之间可以接收到主机发送过来数据,但是单片机发出的数据经过从机发送到主机,主机接收不到。(单片机发送数据的时候,用示波器可以检测到从机的1脚有数据)。从机电路里的芯片的第15脚接地会不会有影响?我是用外部直流电源供得电,第15脚和电源负极一起接的地。