A57D - shows "no pilot"

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Hi,

My new to me A57D does not find SmartPilot X5 in Seatalkng.
My observation are
1. A57D sees well the feed from ST60+ instruments, fed thru Seatalk to the converter.
2. X5 communicates well with ST6000 control head, again thru the Seatalkng to Seatalk converter and X5 works well in Auto mode.
3. Any attempt to set X5 to Track mode returns an error message "No Data"

I upgraded firmware in MFD, autopilot and converter to the latest and still no success.

Is there any hidden option in X5 to set, or maybe a built the network incorrectly? What to check to diagnose the problem?
Attaching the schematics...


Thanks for help!

Dmitry