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您好,
您是使用SPI通信协议通信的吗?ADS1256是SPI串行接口,它的通信协议是SPI通信协议,它之所以可以使用2线通信是因为当不使用DOUT时它是高阻态,可以允许DIN和DOUT连接在一起由双向总线驱动。