ComUnInst()

         Uninstalls Serial Comunications System

    Syntax:

         ComUninst() -> Nil

    Description:

         ComInst() Uninstalls the Serial Comunications System.

         It must be always called before to leave the system if previously
         has been activated the interrupts manager with ComInst().

    Return:

         Nothing.

    Example:

         ComUnInst()