Assuming you have downloaded the correct driver package and control software (e.g., R20XCUSB_Setup.exe ), follow this guide to avoid common errors.
Place a compatible 13.56 MHz IC card (such as Mifare S50/S70) on the reader. r20xcusb software
Buffer sizes and latency:
The (often appearing as R20C-USB or R20D-USB depending on frequency) is a plug-and-play RFID reader designed for desktop use. Because it uses the standard USB HID (Human Interface Device) protocol, it typically does not require dedicated driver software to function as a basic "keyboard wedge". Core Software Functionality Unlocking the Power of R20XCUSB Software: A Comprehensive