125KHz RFID Module Kits

  • Units in Stock: 978
  • Date Added: Saturday 21 August, 2010
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Product Description:

It is compatible with ID cards of 64 bit read-only EM4100, TK4100, and EM4102 series. This module outputs original card information (Manchester code) and ascii codes which can be directly displayed on the computer. Code formate: Manufacturers code + ID card number + parity bits. It can be directly connected to Pin 2 of the computer serial port (COM). Antenna and the module has been adjusted to the best condition, with long reader distance. With CBB capacitors, it has anti-interference to temperature change.


  • Voltage: 3 - 5V DC
  • Current: <50mA
  • Output format: Baud rate 9600, Data bits 8, stop bit 1
  • Manchester code output:
    ___ 1; ____
    | ___; ___ | 0
  • Reading Distance: key card> 5cm, thin card> 9cm, thick card> 11cm, with no blind spots
  • Operation temperature: 0 ~ 70 degrees Celsius
  • Size: 38mm * 20mm

Pin definition

  • VCC: +5 V power supply
  • TX: TX output. Baud rate: 9600, Data bits: 8, stop bit: 1
  • PC: TX output to computer serial port. Directly connected to Pin2 of the computer COM. Note: already embeded with voltage level conversion circuit.
  • L2: antenna
  • L1: antenna
  • GND: GND
  • Mcst: Manchester code output
  • Rest: reset pin, low effective.
  • D1: card available signal. When a card is detected this pin is high. After 6ms, TX outputs data. Then it becomes low after TX output finished
  • D2: vacant
  • D3: vacant

Product list:

  1. RFID reader module x1
  2. Coil antenna x1
  3. Thick ID card x1
  4. Thin ID card x1
  5. Key ID card x1

Sample connection:

While it is connected with PC, super terminal might be used:

Click here to get the reference schematic diagram

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