AD5423 always in fault

Hi

We're trying to communicate with an AD5423 and after the first request, it is always showing a FAULT status.

We've found a CRC-8 that matches the polynomial shown in here https://www.analog.com/media/en/analog-dialogue/volume-45/number-1/articles/cyclic-redundancy-and-correct-data-communications.pdf but that made no difference.

We've tried cycling around every CRC value writing to the DIGITAL_DIAG_RESULTS to try and clear the fault and find the correct message.

Our slip bit is the opposite of AD0 and AD1 which are both low.

Totally out of ideas.

Do you have any sample code that works with the AD5423 that we can examine?  Or messages known to work with it?

Thanks

Dave

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