IOGear GBS301 - Manual (Page 18)

4. Once connected, you will see this
window indicating the COM port number
used for connection with the Bluetooth
serial adapter. In our example below,
this is COM 4, but most likely it will be
different in your case.
16
IMPORTANT: Make note of this COM port number, as this is the COM port that you
need to specify for your specific application. You’re done!
Basic Configuration