https://dccwiki.com/Term:Function_Map Term:Function Map - DCCWiki

Term: Function Map

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Function Mapping determines which keys on the throttle control a function.

The functions can be remapped if needed, in some cases multiple functions can be assigned to a single key. See your decoder manual for which CVs are used for the function map, and how to alter them.

The CVs which are used for function mapping a limited to 8 bits, therefore only 8 functions can be mapped to a key.