An exemplary servicing system for a field device in an automation engineering installation. The servicing system is equipped with at least one sensor for converting a physical variable into an electrical variable and/or with at least one actuator for converting an electrical variable into a physical variable and also with a display device for presenting graphical characters. To dynamically provide a relatively high density of information, at least one subregion of the display device outputs a two-dimensional code, the content of which is alternatively made dynamic on the basis of the respective operating state of the field device and can be scanned by a mobile reader.