AD7768 Diagnostic Mode

Hi, 

I tried to set the Diagnostic Meter Mode by EVAL-AD7768FMCZ + EVAL-SDP-CH1Z.

I set the register 0x56 of the ADC Diagnostic Receive Select Register and 0x57 of the ADC Diagnostic Control Register, but the output data is still input voltage level.

Would you help how to set the diag mode?

Regards,

HM

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