The SFT-ST tachograph file viewer dongle from Tachosys, will fit any USB port and must be resident during use of Tachograph File Viewer. If the dongle is not present the software will revert back to the free version’s level of functionality.
Please note that whilst Tachograph File Viewer does display all of the card activities it does not provide summation of hours or infringement analysis, albeit this could in theory be calculated from the raw data.
The Tachograph File Viewer software can be downloaded here