A reader device in accordance with an embodiment of the present disclosure includes an antenna connected electrically to a processing unit through an antenna connection element. The processing unit controls are configured to read data from a transponder module via an electromagnetic field. The reader device includes a user interface unit which is connected to the processing unit through the connection element and includes a data output part and/or a data input part. The data output part receives via the connection element reader data from the processing unit and outputs this data. The data input part receives via a data entry element user data and transmits this data via the connection element to the processing unit. Thus, user authentication data can be entered by the user and transmitted to the processing unit without the need for additional wiring between the user interface and the processing unit.