Millenium 3 Usb Cable Driver Download ^new^
Some models (e.g., Millenium 3 CD20 with Ethernet option) support TCP/IP. For most compact units, USB is the primary method.
If you have the original packaging, check the model number. If you are using a generic "USB to RS-232" adapter for your Millennium 3, you will likely need to check the Windows Device Manager to identify the chipset if the branding is unclear.