AIU

First, when you say "My TIU is Rev L and powered by Z4000." That implies you are powering using fixed input 1.

For AIU usage- that may not be ideal because you may not have constant power at all times using a handle control for that input first and constantly for the entire session.

Instead you should be powering your TIU via the aux power in jack- with a transformer higher than 12V (because the AIU needs 12V) to ensure headroom for a constant voltage source powering the logic of the TIU and AIU- regardless of track power state.

Thanks for the reply, I should’ve noted my TIU is powered separately  at the jack - The Z4000 is powering the track.

Correct TIU to AIU cable? https://ogrforum.com/topic/tiu-to-aiu-cable

Thanks for the reply on the cable, I’ll check - I thought it was standard - mine is located further away than the standard cable would allow

This OGR post may also be helpful:

https://ogrforum.com/topic/784...98#78438393759364398

Are you sure that at some  point the AIU connection from the TIU wasn't plugged into the AIU output jack instead of the input jack?  This damages the AIU.

Appreciate all the help. I was using a four pin landline. I ordered a 6 pin

Thanks Again!

Remember, they want to be an RJ12 6P6C Male to Male Reverse Wired Cable, not a straight thru table.  Note the colors of the conductors are reversed end to end.

THANKYOU sir. I didn’t know there was a difference and have ordered the correct one!

@nsp154 posted:

THANKYOU sir. I didn’t know there was a difference and have ordered the correct one!

I figured that might be the case, and it won't work with the wrong cable.

Much appreciated