Some general comments on what you want to do:
1. Controlling MTH PS2/PS3 locos: Connect transformer set at 18v to Fixed 1 input terminals of TIU, corresponding output terminals connect to track. Repeat with other 3 TIU channels for separate blocks in larger layouts. Insulate center rails to separate blocks. All black terminals go to outside rails. Need a fast blow fuse or circuit breaker if using older transformers.
2. Controlling TMCC or Legacy locos: Power is already provided through the TIU as discussed above.
a. Now connect a single wire from the Cab1 or Legacy base to any outside rail. Use the Cab1 or Legacy handheld controller. Most people use this scheme because they prefer 2 remotes when running 2 or more trains.
b. Alternatively to run TMCC or Legacy locomotives using the MTH remote, in addition to the outside rail connection, you must use a special DB9 cable from MTH to connect the Cab1 or Legacy Base to the TIU.
3. Controlling conventional or MTH PS1 locos. Connect your track to one of the Variable Channels of the TIU. Advancing the throttle on the DCS handheld remote will adjust the AC voltage to the track as you would with a conventional transformer. Direction, whistle, and bell buttons are also functional. Variable channels can be configured as Variable or Fixed, so it needs to be set through the remote to Variable to do this. Note: While not ideal, you can run a command control loco (PS2/PS3, TMCC or Legacy) in the same block as a conventional loco, though the command locos may have performance issues if the track voltage is too low.
Bob
