How to do a loopback test on a USB-serial adapter

This describes a very basic test procedure to verify that your serial adapter is fully operational.
Materials used in this video:
USB Serial converter: http://www.banggood.com/Wholesale-USB-To-TTL-COM-Converter-Module-buildin-In-CP2102-New-p-27989.html?p=NT1005763073201409DA
Set of jumper wires: http://www.banggood.com/3-IN-1-120Pcs-10cm-Male-To-Female-Female-To-Female-Male-To-Male-Jumper-Cable-For-Arduino-p-1054670.html?p=NT1005763073201409DA
Rechargeable 9V Lithium Battery: http://www.banggood.com/ZNTER-S19-9V-400mAh-USB-Rechargeable-9V-Lipo-Battery-p-1070703.html?p=NT1005763073201409DA
Oscilloscope (Kit): http://www.banggood.com/DSO138-DIY-Digital-Oscilloscope-Kit-SMD-Soldered-13803K-Version-With-Transparent-Acrylic-Housing-p-1051616.html?p=NT1005763073201409DA
9V Clip/Connector: http://www.banggood.com/2Pcs-9V-Battery-Buckle-Snaps-Power-Cable-Connector-For-Arduino-p-971303.html?p=NT1005763073201409DA
Putty Terminal Software: http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

Видео How to do a loopback test on a USB-serial adapter канала AReResearch