Smartcard reader ACR122U has no unique serial number

Question

I am using the PCSC driver and the javax.smartcardio library as the wrapper to the driver. I have 3 ACR122U devices plugged into a Linux (debian) system. I have ran udevadm info on the devices and they all have a serial number of 0. I need to identify which reader is which in my class. I can check which topological usb port is used by parsing the /sys/devices folder but I still cant "select" a device in the Java api.

Does anyone know a way to modify the PCSC device stack order or something. So that I can specify which order the devices are in the terminal list from the terminal factory. I have emailed ACS asking them why the serial numbers are 0 and if they can help me to modify it but I have had no reply.

Please let me know if anyone thinks they have a solution. Thanks, Mitch

Answer 1

The reader does have a unique serial number but it is only an external sticker and not on the readers internal EEPROM. Perhaps you can write the serial number to the reader somehow.