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 cable.  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

Did it finally  work? Also....just curious. How many with a larger layout, actually use an AIU? I would think it would be slow and awkward to have to push so many times on the remote (I am speaking the "old" wireless remote, not the new TIU - I have no knowledge of that!)

Do many of you use the handheld with an AIU for controlling your switches say, vs. using the wired manual control?

I use my TMCC CAB1L for controlling switches on my layout.  I also use the SC2 boxes to control the turntable from the remote.

I ordered the Cables, however recieved RJ12. Correct ones are on the way

@cngw posted:

Did it finally  work? Also....just curious. How many with a larger layout, actually use an AIU? I would think it would be slow and awkward to have to push so many times on the remote (I am speaking the "old" wireless remote, not the new TIU - I have no knowledge of that!)

Do many of you use the handheld with an AIU for controlling your switches say, vs. using the wired manual control?

Yep! I love the remote and have 5 AIU's. Use them for switching and accessories.

@CurtisH posted:

Yep! I love the remote and have 5 AIU's. Use them for switching and accessories.

Then, after I get set up for this year, I may have to experiment with it. When you say "switching" I assume you mean switches (turnouts some call them). You find that faster than just pushing the lever?

Or is it just more accessible when you walk around? I have always used the wired control/lever.

And I can under stand a simple on off accessory (bell, crossing gate) but do you use it for accessories like the milk loader, cattle/horse loader, etc.?  I have a log loader (shown below) with a controller knob that turns on for constant power to the drive chain. If I used an AIU, would I have to hold the remote button down continuously to run the belt? A separate push button activates the dump feature, so I can see the AIU doing that.

In the far, left background, there is a coal loader with a controller that the button is held down continuously to lower and raise the bucket. Again, I guess I would have to hold the remote button to get the AIU to put out continuous power. Does the AIU provide momentary power such as is needed to throw a switch, or can it do continuous also? I guess I could look this up, but I think any experienced used could chime in with an answer. Thank you for the reply and your time, Greg (also on the left side, you see the switch controllers on the small board)

Received & installed the correct RJ12 6P6C reverse cable. Works as advertised. When ordering (mine came from Amazon) insure you include reverse. Otherwise it will automatically pull up ‘straight’ cable.

Thanks all

otherwise know as a " NullModem" cable

I never saw that term used @Jim Teeple.  Interesting that I've read a zillion posts here on this forum dealing with the TIU/AIU cable and that term was never mentioned.  Qualify that by saying "I" never saw it mentioned.

Thanks for making us aware.

- walt

Null Modem is a term used in data communication to refer to a direct connection between two devices using an RS-232 connection. It is most commonly used in DB9 and DB25 connector types. As the two devices communicate without a modem(s), it makes for the term "Null" modem. Without knowing the communication protocol or the pinouts of the AUI port, describing this cable as a "Null Modem" wouldn't be the best description. Each wire is reversed from one end pinout to the other, and the best way to describe this is as a "reverse polarity" connection on a 6P6C connector.

I've said it here so many times: "To me, everything electrical always seems complicated"!!!  No, this example isn't "complicated" per se, but something as simple as describing a cable - wow!

- walt

@walt rapp posted:

I've said it here so many times: "To me, everything electrical always seems complicated"!!!  No, this example isn't "complicated" per se, but something as simple as describing a cable - wow!

- walt

Considering that the AIU cable has nothing to do with the RS232 signaling protocol, the term Null Modem probably doesn't really apply.  It's more properly called a Reverse Cable as that's exactly what it does.

The Null Modem is really an RS-232 wiring configuration, and it doesn't "reverse" all the wiring.  Here's what is considered a "full" null modem,

Here's what many call a Null Modem, it's really just swapping the send and receive lines on an RS232 connection and jumpering the other control signals back to the same side.