MTH TIU, AIU and compatibility with Lionel legacy

Anything attached to the TIU can only be operated with the MTH remote. If your TIU is connected to your Legacy base you can issue TMCC-level commands to it via the MTH controller, but not the other way around.

---PCJ

Thanks PCJ.  That's what I thought but I couldn't find anything that discretely stated that.

You can't operate the switches or accessories connected to a Lionel ASC or SC2 with TMCC emulation from the DCS Remote.  The TMCC emulation is only for locomotives and uses TMCC (not Legacy) command structure.

OhB1 posted:

I am contemplating which direction to go use the Lionel ASC or use the AIU.  I know that you can only control 4 switches with the Lionel ASC and up to 10 switches with the MTH AIU. 

There was a discussion on layout control a while back, basically DCS vs TMCC.  While you can have a mix of control between the two, I think it would get confusing as to which remote to grab to activate a switch or accessary.

I went all Legacy for my layout control because I use DZ-2500 switch machines with Ross switches.  The DZ-2500s can be activated directly by Legacy (through the SER module) so no AIU or ASC.  Plus, the LCS software on my iPad is kind of neat, although I have a long way to go with it for my in-progress layout. So I am going to use Legacy for all my layout systems, switches, Legacy/TMCC engines and operating cars, and lights.  I will use DCS for MTH engines.

For your Atlas switches, I think I would go the opposite direction; Layout control with DCS, TMCC/Legacy engines with Legacy.  I agree that would be cheaper plus I think a bit simpler with fewer AIUs than if using ASCs.