I am making a RFID vending machine to go in a gym using an 24 hour RFID access system. I bought the ID-20 reader from SparkFun and it works great with the cards the gym uses. I get a 12 digit hex number as expected. My problem is that when administrative functions are performed on the existing keypads the RFID keys are referred to by a 6 digit number. This 6 digit number is even printed on the back of the keys. The mystery is to find the correlation between the 12 digit hex code and the 6 digit number. I have two keys to test with. Both are key chain style but they are shaped slightly differently but this should have no effect. Also, the 6 digit number seems to always lead with a zero so it might be thought of as a 5 digit number. I need to make this conversion so charges on the machine can be logged to a certain patron which is IDed by the 6 digit number. My worst fear is that the existing system uses some sort of lookup table so there is no relation but I can't see this as being a possibility as keys are continually purchased. The existing keypads are **broken link removed** and the newer style keys are **broken link removed**
CODE:___ID:
021674__01024C54AAB1
060443__470054EC1BE4
CODE:___ID:
021674__01024C54AAB1
060443__470054EC1BE4