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A popular way to transfer commands and data between a personal computer and a microcontroller is the use of standard interface, like the one described by protocols RS232 (older) or USB (newer). This chapter is devoted to communication conforming to RS232 protocol, the hardware for such interface is provided on board. An example will be presented showing the processing of commands received through RS232 interface, and sending of a string of numbers using the same interface.

Leveraging on our extensive industrial experience, we are counted among the most eminent suppliers and traders of a technically advanced array of RFID Reader & Card. Under this category we offer RFID Reader , RFID Reader - Serial Out, RFID Reader - Serial Out, RFID Reader - USB, RFID Reader & Writer 13.56MHz - Uart Interface, RFID Clamshell Card/TAG 125kHz, RFID Tag Keyfob (125kHz), MIfare Classic 1k Card 13.56MHz for meeting varied application needs of the customers. All these products work on the modular technology and are highly capable of processing secret tags & codes in readable data.

This RFID Reader Module 125Khz is eary to use. It is Low Cost. It gives Serial and Wiegand26 Output.

Using the board with microcontrollers to read a card's data is very simple and requires just a serial connection. The board should be powered at 5V, and it requires a direct connection to the microcontroller's Serial(Rx) pin. The card data is transmitted over the serial line when the card is brought near the module.

The board has an onboard power indication LED, a LED and Buzzer to indicate the presence of a RFID Card. All the IO pins are brought out to standard clearly labeled header pins, which reduce prototyping time and effort. An output pin (DET) also indicates the presence of a RFID card. The board can also be used to output data in Wiegand format. It can detect cards in the range of 3-8cms.

µRFID Reader used to read our RFID cards. Using the module with microcontrollers to read a card’s data is very simple and required just a serial connection. The module should be powered at 3.3 – 5.5 VDC, and it requires a direct connection to the microcontroller’s Serial Rx pin. The card data is transmitted over the serial line when the card is brought near the module.

RFID is Radio Frequency Identification. An RFID reader is used to read RFID tags (which contain certain unique data stored in a chip). An RFID reader and an RFID tag, both have a coil surrounding them. When an RFID tag is shown near an RFID Reader, it collects the unique tag data (a combination of digits and characters) from the RFID tag. Power the μRFID reader; when an RFID tag is shown near the reader, electromagnetic induction will take place between the coils and this powers the chip inside tag. This chip will send data electromagnetically to the reader. The reader will receive this electromagnetically transferred data and outputs it serially. Every RFID reader comes with Serial output pins. We can collect the read data through these serial pins using arduino.

·         When a high value is sent to the SEL pin of the reader, TTL Serial communication is enabled.

·         The output in this mode is the 10 digit card no (ASCII) + 2 digit XOR result (ASCII)

Benefits and Features :

  •  Size (32x32x8)mm
  •  Operating frequency 125kHz
  • Operating voltage range 3.3V to 5.5V
  • Current Rating < 50mA
  • Reading distance 10-15cm
  • Communication parameters 9600bps, 8-N-1 Supported cards Tags which work at 125kHz


  •  Toll fee collection
  • The reader can be connected to the beginning or end of a toll road, which can read the RFID cards from vehicles and debit money accordingly
  •  Access control Restrict entry based on the card ID
  •  Asset management The user can record and retrieve the details of cards used on the module at any given point of time