This support article demonstrates the configuration settings required to accurately read iClass cards of various bit counts. If you are using or planning to use the idChamp™ RS3 with iClass cards with a bit count other than 26, this article is for you.


To accurately read cards with bit counts other than 26, you need to adjust the idChamp™ RS3's configuration appropriately. There are three methods for configuring the idChamp™ RS3; with a Windows PC and the pcProx Configuration utility, with an Android device and the RS3-NFC Setup App, with an iOS device and the RS3-NFC Setup App. All three methods implement the same configurations settings, albeit with a different GUI (graphical user interface.) As an example, this article provides instructions on how to configure the idChamp™ RS3 for use with a 37 bit Prox card.


By default, the idChamp™ RS3 is shipped with the configuration shown below.


Default idChamp™ RS3 Config.
Card Type
Prox
Card Bit Count
26
Leading Parity Bit Count
1
Trailing Parity Bit Count
1
FAC Bit Count
8
ID Number Bit Count
16


 

The configuration required to read a 37 bit Prox card is shown below.


idChamp™ RS3 Config. for 37-Bit Cards
Card Type
Prox
Card Bit Count
37
Leading Parity Bit Count
1
Trailing Parity Bit Count
1
FAC Bit Count
16
ID Number Bit Count
19