Chinese PL-2303 USB to ttl serial interface


     |^^^^^^^^^^^^^^^^^^^^^^|
^^^^^|                   o  |	<--- 3.3V out
     |  component        oo |	<--- GND
usb  |    side           oo |   <--- RX (from ext.device to the pc )
 A   |                   oo |   <--- TX (from the pc to the ext.device)
_____|                   o  |   <--- 5V out
     |______________________|