125Khz RFID module - UART

Introduction

http://www.seeedstudio.com/depot/images/product/P1240147.jpg
RDM 125KHz card mini-module is designed for reading code from 125KHz card compatible read-only tags and read/write card . It can be applied in office/home security, personal identification, access control, anti-forgery, interactive toy and production control systems etc.
Note: Module will notify whenever 125khz tag approaches, tag serial number will be send via TX pin. Easy way for a RFID module on MCU projects or PC connnection via UartSB.

Features

  • Support external antenna
  • Maximum effective distance up to 50mm
  • Less than 100ms decoding time
  • UART TTL interface
  • Support EM4100 compatible read only or read/write tags
  • Built-in external bi-color LED and buzzer driver
  • Small outline design

Specification

May include key specification and other specifications.

Key Specification

Frequency125KHz
Baud Rate9600 (TTL Electricity Level RS232 format)
interfaceWeigang26 Or TTL Electricity Level RS232 format
Power supplyDC 5V（±5%）
Current<50Ma
Operating range>50mm(Depend on Card/Tag shape, manufacturer)
Expand I/O portN/A
Indication lightN/A
Working temperature-10℃~ +70℃
Storage temperature-20℃~ +80℃
Max. humidityRelative humidity 0 ~ 95%
Size38.5mm ×19mm×9mm

Pin definition and Rating

Look the image below(Mechanic Dimensions), and check the pin definition list here:
 Pin Definition :
 P1:
   PIN1    TX
   PIN2    RX
   PIN3
   PIN4    GND
   PIN5    +5V(DC)
 P2:
   PIN1    ANT1
   PIN2    ANT2
 P3:
   PIN1    LED
   PIN2    +5V(DC)
   PIN3    GND

Mechanic Dimensions

Usage

TTL Interface RS232 Data output format

  1. 9600bps,N,8,1
  2. CHECKSUM: card 10byte DATA entire do XOR operation
    0210ASCII Data CharactersChechsum03
Example: card number: 62E3086CED
  • Output data:36H、32H、45H、33H、30H、38H、36H、43H、45H、44H
  • CHECKSUM: (62H) XOR (E3H) XOR (08H) XOR (6CH) XOR (EDH)=08H

Time sequence chart

Exampel

Output date(HEX): 02 | 30 31 30 30 30 37 33 34 45 30 | 44 32 | 03 ->Change to Decimal CardNumber Decimal: 48 49 48 48 48 55 51 52 69 48 CheckSum Decimal: 68 50 ->Refer to ASCII table,get Ascill value CardNumber Ascill: 0 1 0 0 0 7 3 4 E 0 CheckSum Ascill : D 2 (01H) xor (00H) xor (07H) xor (34H) xor (E0H) = D2H

Programming

Connect RX/TX to Arduino UART port , Uart demo code :
void setup()
{
  Serial.begin(9600);
}
void loop()
{
  if(Serial.available())
  {
    while(Serial.available())
    Serial.write(Serial.read());
  }
}

Resources

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Happy hacking