A quick howto guide on reading the Facility / Site code and card number on HID 1431 MIFARE / HID Prox Combo Cards using an Omnikey 5427 CK reader
1. First disable the reading of the MIFARE serial number
2. Ensure Keyboard wedge is selected and also move FSK PROX (e.g. HID Prox, AWID) to the top of the list on the right. This will speed up the reading of you HID cards.
3. In our case we needed to return the facility code prefixed with a 0 and the 16 bit card number prefixed with a -
E.g. So the returned sequence would be 012-34567
4. In our case we needed the number returned in decimal
Don't forget to apply and store changes once configured
Also note that you can use the poststroke [ENTER] if you need a carriage return once the card is scanned.
Also the below bit layout may help - where P: parity, F: facility code: N: Card Number
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
P F F F F F F F F N N N N N N N N N N N N N N N N P