TSU-750 Heavy Steam - Brown Wire

[Jamesn320]

Hi Guys,

Picked up TSU-750 Heavy Steam, nice decoder.  However its second hand and has no paperwork and I can't find what I need to know on the TSU website.

The question is, what is the brown wire for?

I assume it's a function output?

Cheers,

James

[RBrodzinsky]

It is what Soundtraxx refers to as "Function 5 Output" (since it is default mapped to the F5 button)

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[Jamesn320]

Thanks RBrodzinsky, just what I needed. 

[RBrodzinsky]

All the older Soundtraxx manuals (for TSU 750 / 1000) can be found here: http://www.soundtraxx.com/manuals/Oldmanuals.php

[woodone]

WHOA!!! NOT TRUE. The TSU-750 is a 2 function only decoder There are no other outputs. The brown wire that you see is for the chuff cam.
You must have a latter run of the TSU-750 because the earlier ones used a tan wire for the chuff. The tan wire was hard to tell from the white H/L wire, so at one point that changed.

[woodone]

While looking at the wiring that Rick has shown. It does show an out put for the F-5 and F-6.
Been years ago that I have used an TSU-750. But please hold off on wiring up, until I can check in an old install that I still have.
I don't recall ever seeing the Brown and Green- BUT I have slept since then.
Let me check and I will be back.   

[Chris333]

On my light logging TSU-750 the brown wire is for the steam chuff cam.

[RBrodzinsky]

Oops, that was the TSU 1000. Here’s the 750

[woodone]

Ah, that looks better!
Not sure has to what might go wrong if you were to hook up that brown to a LED and power up the LED?

[RBrodzinsky]

Probably nothing. What really concerns me on these two diagrams is the color inconsistency. The 750 has green for decoder ground and brown for cam, while the 1000 has green and brown for functions (yeah, just a switched ground) and Tan for the cam.

I have been seriously thinking about creating a color chart for the different brands and decoder models, and NMRA standards. After the “big 7” (red/black, orange/grey, white/yellow/blue) I never see any consistency.

[nstars]

Probably nothing. What really concerns me on these two diagrams is the color inconsistency. The 750 has green for decoder ground and brown for cam, while the 1000 has green and brown for functions (yeah, just a switched ground) and Tan for the cam.

I have been seriously thinking about creating a color chart for the different brands and decoder models, and NMRA standards. After the “big 7” (red/black, orange/grey, white/yellow/blue) I never see any consistency.

There is a reason for the green/yellow for the ground. 

Marc

[woodone]

Yes, the green / yeiiow striped wire is the ground. Seam like the wires came out of both ends, now the are all on just one end.

[Jamesn320]

Well, this all started because I was given the decoder because the light functions, yellow and white, are damaged and basically don’t work.  Don’t know how.  But I checked with a volt meter and was getting 11v between the blue and brown.  Thinking it was an auxiliary I have hooked it up to the led on the front.  And it works just always on.  I was tying to change it some home how with the setting so it came on and off with F0 and now I see why it wont.  But it’s all installed, sounds great, runs great so a head light always on, I can live with that.

Thanks for  the help.

James

[peteski]

The cam sensor wire is an input. It is designed to accept from zero ovolts to full voltage (blue) in the decoder. The ones I'm familiar with will even accept the DCC voltage from either track.  Attaching an LED (and series resistor) to to (with the other lead of the LED being powered by any of the decoder's voltages will not damage anything.

EDIT:
I just saw James' post and I'm surprised that the LED lights up. Inputs normally have high impedance. Maybe that input has an internal pull-down resistor to keep it at the ground potential when left open.