Why does the RDM6300 not read RFID tags anymore?

Question

I've previously used the RDM6300 with the Raspberry Pi 1 and it worked flawlessly. After switching to the Raspberry Pi 3 it won't read RFID tags anymore.

I'm certain I've connected everything correctly and the module is running. I've also edited config.txt (added enable_uart = 1) and cmdline.txt (removed console=serial0,115200).

The python script I use looks as follows:

#!/usr/bin/python
# coding=utf-8

import serial

# This is where I read the RFID tag

def read_rfid():
    ser = serial.Serial("/dev/ttyAMA0")
    ser.baudrate = 9600
    daten = ser.read(14)
    ser.close()    
    daten = daten.replace("\x02", "" )
    daten = daten.replace("\x03", "" )
    return daten

id = read_rfid()
print id

That's all I needed to get the script working on my old Pi 1. What changed from Pi 1 to Pi 3? What additional changes do I have to make?

Answer 1

/dev/ttyAMA0 is connected to Bluetooth.

Try /dev/serial0 (assuming this is connected to the Pi serial port) console=serial0,115200 should have given a hint.

You can check which devices are available in /dev/

Answer 2

I have encountered the same problem when using a RPi 3B+ - changing the port to //dev/ttyS0 worked for me (yes, double // in front of the dev).