Acol Pier
I am using Dapol semaphore signals with the SC3 decoder. This works with Alpha Central and my NCE Pro system. However when the signal is ON the light on the Central is green. When the signal is OFF the light is red. How can I change this to that when the signal is at danger the light on the console is red?

Thanks, Philip
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Bunkerbarge
Without going and looking as its in a different building, if I remember correctly the Dapol semaphores have two power wires, red and black, and two signal wires, and I can't remember the colour of them.  I think one might be yellow.  Anyway I'm sure if you reverse the two signal wires it should reverse the operation. 
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AHJAY
Its not a matter of wire reversal - there is zero polarity at those wires, they just toggle. Disconnect the signal, toggle it to match the EcOS then reconnect it. It should now be right.

It's a frustrating design error in the signal, but after many years they still haven't corrected it unfortunately.
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Acol Pier
Thanks for the help.The disconnect, toggle, reconnect worked a treat. Yes there are a few idiosyncrasies that take a while to learn!
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Euan
I have the same set-up but also linked to the operation of the points. Big problem I have is that some of the signals go out of sync with the points. Only solution is to crawl under the baseboard and reset! 
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