RailPro > RailPro Specific Help & Discussion
Motherboard replacement - useful or waste of time and $$?
DavidD_OKC:
Good to know about the KA not being functional with a 21 to 9 harness. Thanks Tim - I wouldn't have known otherwise.
So I suppose the thing to do is write that note to Tim Ring.....
William Brillinger:
I guess we could talk to TCS about developing a custom harness that would include both connectors for the LM.
BruceRogers:
These boards seem interesting. I think I'll get some from my local hobby shop to test. The biggest advantage I can see is eliminating all those resistors one needs to wire in when adding the lights. It should keep the job tidier.
DavidD_OKC:
--- Quote from: BruceRogers on January 15, 2018, 05:18:30 PM ---The biggest advantage I can see is eliminating all those resistors one needs to wire in when adding the lights. It should keep the job tidier.
--- End quote ---
That's what I was thinking as well.
William Brillinger:
I've been talking with TCS this morning about these Motherboards.
https://tcsdcc.com/Customer_Content/Literature/Motherboards/AK-MB1.pdf
TCS MB Diagram:
All of TCS' motherboards conform to the NMRA NEM660 Standard for the 21-pin connector. The pin-out for the 21-pin connector is as follows:
The KA is on Pins 16 and 20.
It looks to me like if Ring would offer a 21 pin version of the LM-3 then these mother boards would be plug and play for them.
TCS also indicated they will be offering a 21 pin breakout board soon, which would make connecting a current LM-3 fairly simple.
The TCS T-1-21 could also have the 6 pin harness added to it but it would be a little trickier. There are pads on the underside of the T-1-21 that appear to be for the Aux Outputs.
RailPro LM-3S wiring diagram included for reference:
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