wrote in message ...
=20
=20
.... If for no other reason that it
comes from the factory with all components truly talking to each =
other.
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Naturally, that part about "talking to each other" is hugely important.
But it isn't mystical at all.
My new Honeywell ART 2000, and my old Ryan 9900BX talk very well to,
and also are digitally controlled by, my new Apollo MX20.
And my new Apollo CNX80, besides talking to 3 other Apollo boxes,
also talks quite well to my old Collins FD112V Flight Director.
That's what documented protocols and interfaces are for.

(Unfortunately, my ancient Hoskins fuel totalizer can't talk to =
anything.)
---JRC---