Hello,
I think what you mean is R20C USB RFID reader 13,56Mhz. What kind of conversion you need? I can help you develop the Python program to read RFID tags and convert the ID into another format.
You ma want take a look at this project:
https://www.freelancer.com/projects/software-architecture/Reverse-UID-Byte-Gnfc-library/
Let me know if you interested
Regards