ProxKey III Proximity Key Fob • 1346

I take it from quick reading that the key fobs I’m currently using are not recognized by the existing firmware. They look like https://www.hidglobal.com/sites/default/files/resource_files/prox-proxkey-iii-keyfob-ds-en.pdf which seems to say that they are probably an 85 bit code.

It seems that ProxKey II might be currently recognized, but not ProxKey III.

Is the only way of debugging the protocol involve being connected to a PC using the USB cable?

You can disassemble your device and connect a logical analyzer to the RFID antenna connectors