The RDM6300 RFID Reader is one type of RFID module with a 125 kHz frequency. In this tutorial, we are going to interface RDM6300 RFID Reader Module with Arduino Nano. Previously we interfaced MFRC522 RFID Module and EM-18 RFID Reader with Arduino. The read/write device consists of a Radio Frequency module and an antenna that generates a high-frequency electromagnetic field while the tag is usually a passive device that contains a microchip that stores and processes information. A simple RFID system consists of just two components: the tag itself and a read/write device. RFID (short for Radio Frequency Identification) tagging is an ID system that uses electromagnetic waves in radio frequency to transfer data.