The module used to read uem4100 RFID card information with Uart and Wiegand two output formats & has high sensitivity with maximum 7cm sensing distance for Arduino

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Quick Overview

 


125K RFID reader is a module used to read uem4100 RFID card information with two output formats: Uart and Wiegand. It has high sensitivity with maximum 7cm sensing distance. The 4pins of Electronic Brick Interface make it be very easily used with Arduino.


 


 

The module used to read uem4100 RFID card information with Uart and Wiegand two output formats & has high sensitivity with maximum 7cm sensing distance for Arduino

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Details

Features

  • Selectable output format : Uart or Wiegand
  • 4Pins Electronic Brick Interface
  • High Sensitivity

Key specifications

  • Supply voltage: 5v
  • Max sensing distance: 7cm
  • Uart output: TTL output, 9600baudrate, 8 data bits, 1 stop bit, and no verify bit.
  • Wiegand output: 26 bits wiegand format, 1 even verify bit, 24 data bits, and 1 odd verify bit

Application Ideas

  • Internet of Thing
  • Pet Toy
  • Access Control System 

Schematic

RFID02.jpg

Key Specifications

  • Supply voltage: 5v
  • Max sensing distance: 7cm
  • Uart output: TTL output, 9600baudrate, 8 data bits, 1 stop bit, and no verify bit.
  • Wiegand output: 26 bits Wiegand format, 1 even verify bit, 24 data bits, and 1 odd verify bit; 

Pin Definition and Rating

GND

Connect to the Host GND

-

VCC

Power supply

5V

RX/D0

RX - In Uart mode, it is unused

-

D0 - In Wiegand mode, it represents Data0

5V or 0V

TX/D1

TX - In Uart mode, it represents TX data

5V or 0V

D1 - In Wiegand mode, it represents Data1

5V or 0V

Usage

Uart Mode (Jumper set to the left two pins)

RFID03.jpg
Set up: 9600bps, N, 8, 1, TTL output

Output Time sequence

RFID04.jpg

Output Data Format

0x02

10ASCII Data Characters

Checksum

0x03

0x02 - 1 byte start flag
10 ASCII Data Characters – Card number info
Checksum - 2 bytes
0x03 - 1 byte end flag

Example

Card number: 62E3086CED
Checksum:( 62H)XOR(E3H)XOR(08H)XOR(6CH)XOR(EDH)=08H
Note: The 10 ASCII characters grouped as 5 hex data needs to be further processed as you may find that the 5 hex data is not equal to the number marked on the tags in Decimal. Actually the tag number is equal to the later 4 bytes in decimal. For example, the card number is 62E3086CED, the corresponding number marked on the tag should be 60717296877 which is the Decimal format of E3086CED.

Wiegand Mode (Jumper Set to the Right two Pins)

RFID05.jpg
In Wiegand Mode, output data is formatted with 26bits including 24bits card info and 2 bits parity.

bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
- PE D P0
- - E 0 -
- - D2[7..0] D1[7..0] D0[7..0] -
  • PE is even bit, PO is odd bit;
  • E is the data bit which was involved in even, O is the data bit which was involved in odd;
  • DX[7..0] is the data bit which correspond to Mifare@ Standard & Light card read only ID;
  • Wiegand Format 26bits’ output time sequence;

RFID06.jpg

Notes

Symbol

Specification

Representative value

THD

Sending Start Delay

1.2ms

TSD

Sending Stop Delay

1ms

TDW

Data pulse width

160μs

TIW

Data pulse interval width

880μs

 

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