USB Serial Device Com Number
To discover the COM number of your USB device once it has been installed and plugged in do the following.
- In Windows click the start button and choose 'Run..'
- Type 'devmgmt.msc' to open device manager
- Expand Ports ( COM & LPT )
The Com port device shouild be listed as a
Silicon Labs CP210x USB to UART Bridge (COMx)
The COMx is the COM port number you need. For example COM4