This is turning out to be a Costly Experiment
The stuff is much, much cheaper now, but when I was trying to crack these, I must have spent thousands on these. Mind you, I had loads of them, including a dozen or so that I had in the garage when that blew up.
I've given all my NCDC's and displays away now, except one spare set that I keep as a spare for my own Omega.
I probably know more about these units than is healthy
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I'm secretly hoping that your NCDC201x has lost its programming (which happens sometimes), and thus the message you are getting. If that is the case, I know I can recover it (assuming no other faults). But if the display has a different pairing code to the headunit, I can't. My doubts are coming in because an unpaired NCDC normally gives Radio Safe, not just Display Safe.
Hope that's clear-ish. There are a lot of combinations all giving similar messages, making remote diags inconclusive.