New R8249

[kingedward2..Andy]

Good Afternoon.

Hope all is keeping safe. 

I am new to DCC I bought the R8249 Decoder for my King Edward II and received it today I opened it up and notice that there was a purple wire loose what is the purple wire for if its one that just sits there. 

 

Thanks

Andy

[jane1707819582]

It is the extra function wire .it works with the blue wire (common) switched by F4 on your controller .best to insulate off if you do not need it .

[kingedward2..Andy]

It is the extra function wire .it works with the blue wire (common) switched by F3 on your controller .best to insulate off if you do not need it .

Thanks Jane2.. Thats what i thought. I didn't want to sound like i was being blonde lol

 

Andy

[96RAF]

Try not to confuse decoder functions with controller functions.

 

Purple is decoder function four but switched by F2 on a controller.

 

Decoder functions one and two are switched by controller F0 and used for directional lighting - white and yellow wires in conjunction with common blue.

 

Decoder function three is switched by controller F1 and can be used for an auxilliary purpose - green wire in conjunction with coomon blue.

 

R8249 is a four function decoder and does not support controller F3 and F4, which are only seen on six function decoders.

[ColinB]

Make sure you insulate it, nail varnish seems to work ok. I have blown a couple of DCC decoder up where this stray wire accidently touches the chassis while you are fitting the decoder into the body (trouble is it moves around as you fit the body) .The only thing you know is when you first run the loco and you get a buzz and the decoder doesn't work anymore. Some people platt it into the decoder wiring harness. I also cover the decoder with a sleeve of heatshrink that isn't heatshrinked, so that air can flow through it, but provides insulation. If you are into computers they are really "open collector output ports", the function is really what controls them, but all the DCC decoder manufactures call them functions.