RDM6300 125KHz EM4100 RFID Card ID Reader Module

The RDM6300 is a compact and reliable 125KHz RFID reader module designed to read EM4100 series read-only and read/write RFID cards and tags. It communicates via UART serial interface at 9600 baud rate — making it extremely easy to integrate with Arduino, ESP32, STM32, and any other UART-capable microcontroller. Once powered up, whenever an RFID card enters the reading range, the module automatically sends the card’s unique ID to the microcontroller via serial. The module comes with an external loop antenna (46×33mm) connected via a 2-pin connector. Its small PCB size and low power consumption make it ideal for embedded and portable applications. Widely used in office/home security, door access control, anti-forgery, attendance tracking, and interactive systems.