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Rapido B36-7 Decoder Mapping

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G8B4Life:
Well, it's as I thought from the original thread; The Gyralight operates on a logic level output from the LokSound decoder. This means as of right now you can't power it directly through the 21 pin interface with RP.

This is the function mapping for the B36-7 from Rapido. As you can see for the entries with F13 in them the Gyralight is on Aux11 (forward) and Aux12 (reverse). These are pins 6 and 5 on the 21 pin decoder.


Click image to enlarge

Now the confusing thing with whats in your photo's from the other thread is that while U+ is positive and has a red wire. X11 and X12, being logic level should also be positive but they, along with X10 (the emergency light) have black wires. Not that many manufacturers follow any colour convention when it comes to wiring but it's not helpful in figuring out whats what. I also don't see any connection to ground on the board.

To really work out what's going on you'll have to unscrew the Gyralight board and see what's going on the underside.

I still solidly suspect you'll have to hardwire your own Gyralight in. It may be possible to modify the existing board but until we know what's what with it it's too hard to say.

-Tim

CPRail:
Thanks for reading the file Tim. I'll try and get some photos of the Gyra-lite board tonight so we can continue delving into the mysteries...

CPRail:
Sorry for the delay in getting the photo of the Gyra-lite board, but better late than never. The Front Gyra-lite are the copper wires from X10 and X11, along with the corresponding red wires from the U+ tab.

G8B4Life:
Took me a while to figure out what was going on here, your photo is of the small circuit board in the shell which I had forgotten about and I was talking about getting a photo of the underside of the small circuit board attached to the chassis! You don't need to do that now as I've worked out that the two little board are just a "plug and socket" arrangement so separating the shell and chassis is easy.

Anyway, there are no transistors on the little board so that means they must located on the decoder motherboard, on the underside as I see none in your photos of the decoder motherboard. This then makes sense of the wiring to the Gyralight and emergency light but unfortunately makes wiring just a bit harder for you.

Because we can not control logic level with RP without a lot of extra circuitry that means you can't just hook the LM up to the 21 pin adapter and off you go, you will have to hardwire the LM for the Gyralight and Emergency light. The good part is you should be able to wire the LM directly to the little board on the chassis. You will very likely need to put appropriate resistors in line because I don't know where the existing resistors are; they could be on the motherboard (which you'll bypass) or it might be at the LED's themselves. You'll have to check carefully. Do you have a multimeter?

So the blue wire would go the U+ pad on the little board and the outputs of your choosing would go to X10, X11 and X12 on the little board.

- Tim

PS, now I'm wondering why X10 and X11 only have one set of wires each and X12 has two?

CPRail:
Hmm, good question Tim. Let me take a peek this afternoon and see why X12 has two wires.

Stay tuned.

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