Hi Osvaldo, normally, proximity cards spit out a GUID - a unique 16-character-string. If the reader is connected by USB then there should be a driver which provides you with the RFID chip's data (= the GUID). Other readers are connected to the keyboard and work like that. Means they send a unique character combination in front of the GUID and and after it. 'Emulating' an RFID chip is not the way to do it. Just try to get a bunch of such cards from one of the well-known suppliers. e.g. [
www.rfidhy.com]
Regards,
Guenter