What protocol does this RFID RC522 module use ? (NRST, GND, SWIM, VCC)

Using Arduino Networking, Protocols, and Devices
#1

Hello.
I have this RFID RC522 module, it looks like attached image

The pins are labeled like this: NRST, GND, SWIM, VCC and GND, RX, TC, VCC

What protocol is that ?
Anyone knows if this module can also write RFID tags or just read ?
Any sample code/library that can work with it ?

I can only find examples for a different RC522 module, but nothing at all for this one.

Thank you.

#2

What protocol is that ?

UART.

Anyone knows if this module can also write RFID tags or just read ?

Most probably it can both but that's wild guessing as you bought a device without documentation. My guess is that the MFRC522's UART interface is directly connected to the pin header so you should be able to use most of the chip's functionality over it.

Any sample code/library that can work with it ?

There is a library but I didn't use it myself (I only used the MFRC522 over the SPI interface yet).

#3