125Khz RFID module - UART

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.

Model: RFR101A1M

http://www.seeedstudio.com/depot/images/product/P1240147.jpg

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

Frequency	125KHz
Baud Rate	9600 (TTL Electricity Level RS232 format)
interface	Weigang26 Or TTL Electricity Level RS232 format
Power supply	DC 5V（±5%）
Current	<50Ma
Operating range	>50mm(Depend on Card/Tag shape, manufacturer)
Expand I/O port	N/A
Indication light	N/A
Working temperature	-10℃~ +70℃
Storage temperature	-20℃~ +80℃
Max. humidity	Relative humidity 0 ~ 95%
Size	38.5mm ×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

9600bps,N,8,1
CHECKSUM: card 10byte DATA entire do XOR operation

10ASCII Data Characters

Chechsum

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());
  }
}

Support

If you have questions or other better design ideas, you can go to our forum or wish to discuss.

Version Tracker

Revision	Descriptions	Release
v1.0	Initial public release	Nov 03, 2008

Resources

Datasheet: RDM630-Spec.pdf
How to connect Arduino and RFID

How to buy

Click here to buy: http://www.seeedstudio.com/depot/125khz-rfid-module-uart-p-171.html?cPath=144_153. This product is off the shelf if you can not get to by the link. You can buy the high version Electronic brick - 125Khz RFID Card Reader at http://www.seeedstudio.com/depot/electronic-brick-125khz-rfid-card-reader-p-702.html?cPath=48_52.

Licensing

This documentation is licensed under the Creative Commons Attribution-ShareAlike License 3.0 Source code and libraries are licensed under GPL/LGPL, see source code files for details.