User`s manual

A-5
To install this second driver, follow the same steps as the first.
Once the second driver is installed, you may see a message like the one
below, prompting you to restart your computer.
Restart your computer to complete the process of installing the drivers.
The process of installing the USB drivers has created a virtual comm port on
your computer and assigned this port a number from 1 to 16. You will need
to select this comm port number in PETRAPro when you go to download
your Ultra. PETRAPro makes this easier to do by only listing the comm
ports that are available in the download screen. However, if you want to
check to see what port number the virtual comm port has been assigned,
you can do so through the computer's Device Manager list.