DAC 9739

I'm using two DAC 9739 with Sync Controller enabled (one in a master mod and another in a slave mod). I'm using initialization steps from DAC 9739's Data sheet (t.32, p. 48). At step 20 instead 0x90 I get 0xb0 or sometimes 0x60. I'd repeated this operation 3 times but nothing changed. In slave mod all works fine.

How could I read the right status (0x90)? Could you suggest something?

Best regards