*PLEASE DELETE* Problem solved

Run a wire from the Legacy command base to the negative output on your TIU. I have been running both for years like that. They will play well together. Connect your power into the input side of the TIU.

Scott Smith

What Scott said is all you have to do between the systems. The connection cable is only to run TMCC with a DCS remote, which you don’t want to do.  If you have a legacy base, just hook that up, you don’t need the TMCC one as well.

we run tmcc and legacy and dcs on the same line all the time.

just use the remote for each system

You use the DCS remote to run TMCC in that configuration. Make sure the wire from the TMCC or Legacy base connects to the black Output post of the TIU channel connecting to your track.

Also, why are you running in passive mode? If so, you need to power the TIU through aux.

George

Sorry, re-read everything. You have to have a command cable from the TIU to the Lionel base to run TMCC off the DCS remote or the DCS wifi app. With wifi, I think you need the premium app.

You should be using AC power to the track to be sure you are compatible with all of the trains. They all run on AC only some can run on DC too.

George

Don't power the TIU through fixed 1 for passive mode. Use an aux power supply. Never power the fixed 1 input and directly to the track at the same time.

Zach Ferreira,

    These people are being very nice and trying to get you started, which is great.  I recommend you purchase Barry's DCS O Gauge Companion book, he spells out everything you need to understand about running both Legacy & DCS together.  Names the correct cables required for connecting your Legacy Base to the TIU and explains exactly what must be done to set up everything.  If you already have a Legacy layout try adding DCS drops to the existing Legacy layout before rewired in a different manner, some times it works without major rewiring.

I do not use WIFI or the App, Barry also has his new book out explaining all this technology also.  IMO you should also add this to your Train running library, if you plan on running WIFI and the Apps.

If you own the ZW-L you have enough power now to run what ever trains you desire. I recommend using resettable 10 Amp Breakers between your DCS TIU and your ZW-L Transformer, on every Red line running to your DCS TIU.  I do the same thing with my Z4K and old ZW type transformers and have never ever had a problem with my layout.  This may seem like over kill, however it completely safe guards your layout and the resettable breakers are very easy to use.

Remember to build using the Block Engineering Technique for best signal results running DCS, if you are planning to rebuild your layout.  No more than 13 Track Joins for each Block Section you build, use as many long sections of track in your layout as you can.  

Use high quality 14 Gauge Stranded Wire for running your DCS, I run Legacy wire drops to the each Black out Channel on the DCS, do not run thru the TIU with the Legacy Signal.   I also run a Legacy wire drop from the Legacy Base directly to the opposite outside Track Rail from the DCS Black wire drop.  This will give you Max Legacy signal strength for your layout.  Some time when you talk to MartyF thank him for this Legacy drop knowledge, it was his original idea.

Have fun with adding your DCS to your Legacy layout, in reality it's a lot easier to add Legacy to a DCS layout, than the other way around.

PCRR/Dave

Construction continues on the PCRR Train Room.

Update: 

I have found a way that works, and here is what it is. I used a 16 volt auxiliary power supply to power the tiu, and ran 2 track wires from the fixed output 1 side of the tiu to my track bus, and connected the tiu and the wiu through the sabernet cable. I was able to run mth and lionel at the same time with no signal struggle. Thanks for everyone's help and good luck on your wiring adventures.