I've been trying to add a second TIU and operate it in super mode but unsuccessfully. I now have both TIUs with unique identities. TIU #1 flashes once when I power it up and TIU #2 flashes twice. My remote reads both TIUS. The remote is set to super mode. My remote and both TIUs have DCS version 6.01
The problem is that engines respond very sluggishly to commands issued via TIU #2. I have very little control over them. Operation is normal with TIU #1.
I've looked into the issue of center rail connections mentioned in previous posts on this topic. A lighted caboose behaves as it should at the intersections of tracks controlled by the two TIUs. It lights when powered by the transformer connected to TIU #1 and doesn't light when moved to the tracks controlled by TIU #2 with the transformer off. (I'm using two Z4000 transformers to power the two TIUs.)
Any suggestions that you might have would be welcome.
Tom