Dave in PA,
On 17 Sep 2019, at 4:45 PM, Video7105 <video7105@...> wrote:
Thanks Dave, Ken and Dick
So my problem is the use and definition of the word GND.
Yes.
Where as the GND for the AIU comes from the Control Bus?
It's actually the Cab Bus (the 6 way socket on the Power Pro) that connects throttles, AIUs, Mini Panels etc. to the Command Station.
NCE uses the term Control Bus (the 4 way socket on the Power Pro) for the connection between the Command Station and Booster(s).
The GND on the BD20¡¯s comes from where, the AIU board?
Yes, the specific AIU board that BD20 is connected to.
And
The external power connection for the Switch8 MK2 GND comes from the negative of the wall wart?
Yes.
Is this the correct scenario ?
Yes, with a slight correction of terminology.
P.S. The Accessory Bus is the term used for a specific DCC signal bus reserved for accessory decoders only. It is usually separated from the Track DCC bus by a circuit breaker or on a separate booster. The reason is so that a track short will not disable the accessory decoders needed to change the turnouts to clear the short.
Dave in Australia
