Problems with reading x_DELTANG_OUT registers from ADIS16480

Hello. I'm trying reading contents from DELTANG_OUT registers (X_DELTANG_OUT in particular, approximately once in a second) but always obtain some results like this:

0xFFFF 0xFFFE 0x0000 0xFFFF 0xFFFF 0xFFFF  0x0000 0xFFFF and so on, some chaotic values close to zero, no matter if it's in slow motion or not. I also read PROD_ID value each second and obtain correct values 0x4060. Is it necessary to make initialization procedure with some other registers (not leaving their default state with 0x00 values)? Is there  some application documents in details to obtain correct DELTANG_OUT values? Thanks in advance.

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