... alarm monitoring.Features Y.LINK01 is now capable to handle1 doors / 2 readers with a single controller.Y.LINK02 is now ... single controller.Y.LINK04 is now capable to handle 4 doors / 4 readers with a single controller.Y.LINK Series ... monitoring features: expiry date for clubs, automatic activation, interlock between two doors, time zones, supervision, anti-pass back, activity reports... Each alarm ...