Serial Port Debugging 101 : Loopback Test

Shorting Rx-Tx (UART Pins) of Raspberry Pi. The shield on RPi in the picture is PiUPS+ which, as the name suggests, is the Uniterrupted Power Supply for the RPi.
sudo minicom -D /dev/ttyS0
Console output for Serial port
Shorting Rx-Tx of USB-Serial Converter
Setup to check USB-serial converter
Console output for USB port
Standard Port settings. Note that: The flow control is None.
Console when echo is disabled
How to enable Echo on Hypertermminal
First output: Echo disabled, Second output: Echo enabled

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