This table covers a wide range of decoder functions including:

Reversing the engine (in the event that it runs backwards when set to forwards and vice versa).

Running the locomotive in 14 or 28/128 speed step mode (the courseness of the motor control).

Enabling and Disabling the decoders ability to run on DC.

Enabling the User Loadable speed tables for precise control of the speed curve.

Enabling "4 digit addressing" which will allow the locomotive address to be higher than 128.