Labeltext from string declaration (rules) possible?

I have searched for labeltext of an item, but did not find many results.
I get a string via serial that I wnat to use as labelltext for an item. Is this pssible?

It seems that this is a primitive question, but I can not find any hints so far.

Thanx, cal

Unfortunately there is no way to change a label of an item dynamically. You have to set the label static in the item definition, but you can complete the label with a dynamic part that represents the state of the item.