Identifying CP2105 COM Port Numbers in Windows

by <a href=""><font color="#000000"><font size="2">Hero Employee</font></font> </a> Stephen on ‎12-28-2016 04:19 PM - edited on ‎02-20-2017 04:00 AM by Administrator Siliconlabs


How do I determine CP2105 COM Port Numbers in Windows?


Once the device has enumerated, Windows will assign the CP2105 two COM port numbers. Here are a couple of ways to look for the COM port numbers.


Manual Method — You can manually check for device enumeration in the Windows Device Manager. The CP2105 will show up as two COM port numbers like below. Note: If you are using a customized driver, the device may not be listed as "Silicon Labs Dual CP210x...", but it will still have COM port numbers.


device manager.png


Programmatic Method — Windows stores the COM port numbers in the Windows registry. Software can be written to search the registry for these COM port numbers. See Application Note AN197 section 7 for details.