Method of constructing a reference data structure and method of controlling an actuator. The present invention is aimed at a method of constructing a reference data structure (DR) comprising at least one setpoint parameter (PAR) for at least one actuator (12) of an item of equipment of a building-automation installation, comprising a step (S30) of generating the reference data structure (DR) comprising an association set ({CVE1j; VPi}) for associating between at least one determined value (VPi) corresponding to the at least one setpoint parameter and the determined combination (CVE1j) belonging to the set (E1) of functional data (CVE1) and a method of controlling at least one actuator (12) of an item of equipment of a building-automation installation, the method being implemented by the actuator (12) or by a controller (11) associated with said actuator (12) and comprising a step (E30) of controlling the at least one actuator (12) by applying a setpoint (Cs) determined as a function of the at least one setpoint parameter value (VP) selected in the reference data structure (DR) as well as a system comprising at least one computer (20) and at least one actuator (12) for the respective implementation of said methods.