RDM6300 125KHz EM4100 RFID Card ID Reader Module
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

RDM6300 125KHz EM4100 RFID Card ID Reader Module

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  • Product SKU: KG063
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The RDM6300 125KHz EM4100 RFID Card ID Reader Module is a module used for reading 125KHz RFID cards, specifically those based on the EM4100 protocol.

Here's an in-depth overview of this RFID reader module:

Purpose: The RDM6300 module is designed to communicate with RFID cards that operate at 125KHz frequency, following the EM4100 protocol.

Functionality: It reads the unique ID of RFID cards that conform to the EM4100 standard.

Communication: The module provides UART (serial) communication for interfacing with microcontrollers.


RFID Compatibility: The RDM6300 module is specifically designed to work with RFID cards using the 125KHz frequency and the EM4100 protocol.

ID Reading: The module can read the unique identification number stored on compatible RFID cards.

UART Interface: It communicates with microcontrollers using the Universal Asynchronous Receiver-Transmitter (UART) protocol, making it easy to integrate with various microcontroller platforms.

LED Indicator: Some versions of the module include an LED indicator that lights up when a card is in proximity and being read.


Access Control: Used for simple access control systems where users present their RFID cards to gain entry.

Identification: Employed in various applications requiring identification, such as attendance tracking, membership management, and more.

Automation: Integrated into projects where objects or devices need to be identified and controlled wirelessly.

Using the RDM6300 Module:

Wiring: Connect the module's TX (transmit) and RX (receive) pins to the corresponding pins on your microcontroller.

Powering the Module: Provide the module with the required power supply (often 3.3V or 5V) and ground connection.

Programming: Write code for your microcontroller platform to read the data sent by the module through the UART communication.


Frequency Compatibility: Ensure that the RFID cards you use are operating at the 125KHz frequency and follow the EM4100 protocol.

Data Handling: Be aware that the module provides only the ID of the RFID card. If additional data is required, it needs to be managed by your application.

When integrating the RDM6300 125KHz EM4100 RFID Card ID Reader Module into a project, understanding the communication protocol, frequency compatibility, and handling the unique IDs are essential for successful RFID card reading.

Technical Details

  • Operating Frequency: 125KHZ
  • Baud Rate: 9600
  • Interface: TTL level RS232 format
  • Working voltage : DC 5V(+/-5%)
  • Working current: <50mA
  • Receive distance: 20~50mm
  • Working temperature : -10°C~+70°C
  • Storage temperature : -20°C~+80°C
  • Humidity: 0~95%
  • Wiring size: 46*32*3mm

Physical Attributes

  • PCB size : 38.5 x 20 mm
  • Weight (gm): 8

Integration with Arduino

RFID RDM6300 Module

Sample Code

Additional Details

  • Maximum effective distance up to 150mm
  • Less than 100ms decoding time
  • Support external antenna
  • UART interface
  • Support EM4100 compatible read-only or read/write tags
  • Small outline design

Product Video


Package Includes

  • 1 x RDM6300 125KHz EM4100 RFID Card ID Reader Module

Customer Reviews

Based on 4 reviews
gajender kumar
RDM6300 simple RFID reader

Hooked this up and got it working pretty quick. I found several libraries online. It didn't come with an RFID tag and the first ones I bought weren't compatible. Apparently Just being 125khz isn't enough they have to be EM4100 compatible. It worked once I had the right tag. The only other RFID reader I've used and compare it to is the RC522. Their sensitivity seemed about the same distance, and inch or so. With one library I tried this one output the value continuously while the tag was in range and with another it didn't. The RC522 always gave only one reading per tag. The RC522 had the sense coil built into the circuit board where this one is a separate coil. Which is better depends on how you want to integrate it into your project.

As described

I loaded up the apropriate libary and hooked them to an Audruno. Bang, it worked!There is an active low LED output on the board that was not mentioned anywhere. It blinks when data is transferred. Nice!

Easy setup, works like a charm.

Got this up and running in about 5 minutes, once I found the library and code for an Arduino. Look on playground dot arduino dot cc for the RDM630 library. I'm going to try it hooked up to an 8266 next for the wireless connectivity to my projects. Totally cool.

Good reader, easy to setup with Arduino or Pi.

Didn't quite work for what I intended (reading pet tags), but it does work as designed. Only problem is the antenna wind is not protected and very easy to damage (slight bends even with mess with the field)... I was ables to stabilize and protect it a bit by mounting to a small circuit board.