I have an Raspberry Pi model B, and I want to hook up this RFID/NFC reader I got. This is the one I have.
It has TX, RX, VCC, and GND. When I try to hook up TXD -> RXD and RXD -> TXD (or TXD -> TXD doesn't matter), I cannot get it to respond to anything I do. I have tried 5v and 3.3v, but I prefer UART as it seems more documented, so I go with 5v.
To test if the ports even work, I hooked up RXD to TXD on the Raspberry Pi to create a loopback. Using
minicom -b 9600 -o -D /dev/ttyAMA0 to read from the port, I could see my keystrokes. Perfect. But, when I connect my device and I do the same command, I see nothing when I try to read the cards I have, even though the LED blinks when it reads a card.
This should work, but it does not. I did try hooking up the RFID device to my Arduino, then load a library, and I could read the cards through the serial monitor easily. And yes, I did try switching around TXD and RXD. I also tried using
screen 9600 /dev/ttyAMA0 but unfortunately that didn't work either.
Anyone out there who can help? Thanks!