store actual level in the dtr
store the dtr as max level
store the dtr as min level
store the dtr as system failure level
store the dtr as power on level
store the dtr as fade time
store the dtr as fade rate
store dtr as short address
query missing short address
query physical minimum level
query system failure level
query fade time / fade rate
query scene level (scenes 0-15)
set data transfer register (dtr)