Install and Configuration
Visit Silabs site and Download USB Driver for your OS.
Now you can use any software supporting COM ports to connect to this newly created COM port.
System can assign any number to this COM port. Even if you change your USB Port the COM port number will change. If you plug your hardare into same USB Port, the COM port number should remain same.
In case you want to change the system assigned COM port follow below steps.
Start > Run: Type "Device Manager"
You can select COM port number, Even though it is showing in use. Just make sure it does not clash with existing connected COM ports.