An access control system controls access to a restricted area. The field controller manages at least one controlled device in an industrial process operation. A base station and user terminal using above method in the Long Term Evolution time division duplex system. A first opening is positioned in the housing and provides access to an interior space of the housing for storing tools therein. The controller logic transfers the data of the first write operation and the second write operation in an order other than the order in which the second memory received the first and second write operations when the first write operation and the second write operation write data to the same track.