Dave,
My understand of the command station cycle is it polls all cab addresses
either fast (ones it has got responses before) and those that didn't respond
(infrequent to see something get added). So it will have read the AIU. What
I don't see in the memory of the system is the extra mapping of how it knows
a bit has changed or not. So I suspect that isn't in the USB memory space
and why the other command, but that is a guess.
Key is we get AIU with the USB and it seems to work.
-Ken Cameron, Member JMRI Dev Team
www.jmri.org
www.fingerlakeslivesteamers.org
www.cnymod.com
www.syracusemodelrr.org
Ken Cameron