Again and again, there are archiving gaps when downloading tachograph. This raises the question of how this can happen. Is it the download medium, the settings, the software or the digital tachograph itself? What can the entrepreneur do to archive the missing data?

Among other things, the tachograph itself stores the time of the last download with a company or workshop card. This has the advantage, for example, that the entrepreneur can always start the prescribed download from the last download. So unnecessary time for the download can be avoided. However, download tools differ in their functions.

The download key from VDO offers the user the option to select the function “since last download” in the configuration software. The special feature of this selection, however, is that the function does not refer to the last download date stored in the tachograph, but to the date stored in the internal log file of the key. This means that the download starts from the date on which the tachograph was last read with this key – regardless of the last download date, which is stored in the tachograph.

If you use only one key in the fleet, this is not a problem. But if there are several tools in use due to the size of the fleet, a download can take a little bit longer. Namely, if accidentally the key is used, in the log file of the current vehicle is not yet stored. In that case, a complete download of the last 365 days will be done. Alternatively, it is also conceivable that the last vehicle contact with this key is just a few months ago. Then just since this last contact that is Download, downloaded. Both are basically no problem and only affect the time required for the download.

Other manufacturers, such as the company TachoSYS with the digiVu go here another way. Here, the “since last download” setting refers to the date stored in the tachograph. Thus, it does not matter at all, with which key which vehicle is read out. The download always starts in this case since the last download, which was carried out on this vehicle. On the other hand, the Key of the company Matt offers in the configuration software the possibility of choosing which of the named times should be used – the last download date in the tachograph or in the internal log file of the key.

While the behaviour of the download key of VDO confuses the keys or vehicles “only” on the download time, the use of the date stored in the tachograph can also bring disadvantages. If, after the last download with the company card, a calibration and a download with the workshop card were carried out, this date would now be the corresponding reference date in the tachograph. If a download with the company card and, for example, the Actia D-Box is performed, the data would not be downloaded between the last download with the company card and the download with the workshop card. This is then displayed in the evaluation software as an archiving gap.

Remedy then only a repeated download, in which either a complete download of the mass storage is performed, or with the help of the settings, exactly the missing time range is selected.


Both versions certainly have their rights and, depending on the situation, pros and cons. It is important for the entrepreneur to simply know why a time range of data can be missing. And above all, he has to know the option of being able to download the missing data. Missing data can cost you up to € 1500 per day.