hello I want to ask, I have a device that uses RFID then I remove it like this but I don't know what brand it is and on the back there is a checkbox that is checked on ID and RS485 and wiring.
Has anyone ever used rfid like this and how and the program to connect with Arduino Mega? There are 4 cables: red, black, green, and white cables.
I suspect that is an RFID reader. Maybe load up a library or three and see if it responds.
Yes, I know. There is a similar device in my place and this rfid reader is used to read rfid cards with a frequency of 125Khz. But I want to try to use this rfid reader for my own project but I still don't know how to use it.
This link might give you some ideas HERE
Measure the voltages on the green and white wires before you go plugging them into your Arduino. Arduino is a 5V device, thus, Arduino Uno Serial is TTL (0-5V) so you'd likely need an RS485 -TTL converter maybe such as this
https://www.serialcomm.com/serial_rs232_converters/rs232_rs485_to_ttl_converters/rs485_to_5v_ttl_converter/rs485_to_5v_ttl.product_general_info.aspx
but I'm not totally sure if the linked device is appropriate for Arduino or your device.
