My guess is that the 0x8A command uses the CS Memory Block to compare/store the last polled state for the AIU, hence populating the last two bytes.
It's possible the Power CS does actually poll all known AIUs at the cab bus level and update the memory block. It probably also plays a part in AIU Broadcast mode (which we don't use).
--
Dave
The New England Convention 2018
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On 8 Mar 2018, at 6:29 AM, Dave Heap <dgheap@...> wrote:
Tried the Power Pro and the only difference was that it used the 0x8A command instead of the 0x9B command and got a 4 byte reply instead of a 2 byte reply.
There were no memory read commands from JMRI.
