Some tests with an ohmmeter indicate that the black of the TIU circuits is always connected to one of the terminals of the AUX jack, which is why it would not be a good idea to use a layout connected transformer to power the AUX port. There are also other reasons, like losing control if that transformer breaker should open but the TIU inpouts are still getting power (e.g., if you have multiple transformers).
Dave, the manual that comes with the DCS system is adequate to set up and run an average layout. But there are some of us who want to learn all the details and to unlock all of the capabilities of the DCS system.
To keep insisting that only an expert can run DCS is to unjustifiably criticize MTH and scare of persons who are considering its acquisition. Mike Wolf and Barry Broskowitz do not reveal sales figures, but I suspect that the latter's volume of book sales is only a small portion of the former's DCS sales.
