The invention relates to a control device (7) for a locking system of a movable opening relative to a frame, this control device (7) comprises: - on the one hand, a base (70) intended for be made integral with the sash (3); - on the other hand, a control member (71) of the locking system; - on the other hand also, means for mounting in rotation (72) the control member (71) relative to the base (70), this between a locking control position and an unlocking control position; - Transmission means (73), from the control member (71) to the locking system (5), of an unlocking and / or locking control. This control device is characterized in that the control device (7) comprises a clearance (74) provided between the control member (71) and the transmission means (73), this to allow an empty stroke of the 'control member (71) relative to the transmission means (73) and / or transmission means (73) relative to the control member (71).
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