View source for Raspberry Pi Serial TroubleShooting

Pin 8 is TX
Pin 10 is RX

[[File:Raspberry-Pi-GPIO-Layout-Model-B-Plus-rotated.png|750px]]

* '''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.


[[File:RaspberryPi_Serial_loopback.jpg|400px|thumb|left|Raspberry Pi Serial Loopback]]