How do I know which system my card uses?

To verify whether you have an Axess or a Skidata keycard, check its serial number’s format (usually found at the):

The serial number of Axess keycards (also called Smart Cards) generally follows the following format:

WTP : XXXXXXXX-XXX-XXX

The serial number of Skidata keycards generally follows the following format:

DTA : XX-XXXX XXXX XXXX XXXX XXXX-X