How to assign unique serial number to each CP2102 so multiple units can work on same PC with a different COM port.
If you are using multiple CP2102 based adapters on your PC, then each one needs to be set a unique serial number. By default each unit has serial number 1. so if you plugin another one with same serial number, it will stopped working.
The modification is simple. Just download and use the CP2102 customization utility.
Press refresh and select the connected CP2102. Now only change the serial number to something unique and click program button.
Here is the screenshot what it looks like if we assigned serial#12 and program it.