Raspberry Pi Serial TroubleShooting

Pin 8 is TX Pin 10 is RX

• Checking that hardware serial pins are working and mapped to the correct device name.
  • Setup
    • Connect a jumper between Pin 8 and 10 creating a loopback.(Basically we are connecting the serial output pin to the serial input pin)
    • Open a terminal Program like Minicom connecting to the serial port.
    • Test it by typing. All input should be echoed(returned) back if it is working correctly.
  • Things to consider
    • Raspberry Pi B+ Version 1/2's default serial port is /dev/ttyAMA0
    • Raspberry Pi 3's is a bit harder to check as /dev/ttyAMA0 is now connected to the Bluetooth device and the serial port is setup for /dev/ttyS0. They have also introduced new alias /dev/serial0 to simplify future changes. There are also ways to make the RPi 3 act like the other Pi's making it harder to determine serial configurations.

Raspberry Pi Serial Loopback