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IDK4379EVM的Endat接口问题?

Other Parts Discussed in Thread: SN65HVD78, TXB0104, AM4376

     IDK4379EVM(R1.3版本)的Endat2.2接口部分,芯片SN65HVD78的供电为3.3V。而在IDDK379的Endat2.2电路部分采用的是5V供电,通过TXB0104进行了5V和3.3V的电平转换。而在海德汉的Endat2.2的手册中,编码器的供电为5V,但是并没有指明其信号部分的电平要求。

我的问题是:

    Endat的信号接口到底应该采用3.3V电平还是5V电平?