DN122K2 1 Amp N Scale Mobile Decoder for Kato N RDC

These decoders are made to fit specific locomtoive chassis.  Locomotives that have circuit boards that can have decoders installed in place of the original circuit board are made by many manufacturers.

In some cases, locomotive modifications, motor isolation and additional soldering may be required during installation of this type of decoder.  Function leads can be added to these decoders using solder pads available on the decoder.

See the instruction sheet for the particular decoder you are using for specific instructions.

Sometimes these are called plug n' play or drop in decoders.

2 function decoders support F0 Forward and F0 Reverse.  This allows for reversing headlights or for two separate functions.

How functions are numbered:

F0 (FWD) White

F0 (REV) Yellow

The Blue wire is Lamp Common to allow for continuous lamp operation.

F1 Green

F2 Violet

F3 Brown

F4 White with Yellow Stripe

F5 White with Green Stripe

F6 White with Blue Stripe

F7

F8

F9

and so one are each counted as one function.  This is an industry wide convention.