Hi, I am trying to understand how "card reading" actually works.
And there is an issue I do not completely get:
We have cards (EM 125KhZ) from brand 'A'. When using them on a system from brand 'A', they work pefectly. When using them on a system of brand 'B', they also work.
On the other hand, when wa take a card from brand 'B', they work on the system from brand 'B', but they will not work on the brand 'A' system.
First T thought all had to do with the card numbers, and their factory codes.
But when I wrote an empty card with the same factory code, it did not work.
Even more: I copied the card into a new card, and even the new card did not work, while the original card works perfect.
So my question is now: How is this possible?