Humboldt legacy loggers require a serial port to connect the equipment to a PC. Many PC's do not ship with a serial port. In the event you require a serial port you will need to purchase and use the HM-000379 USB to Serial adapter.
The USB to serial adapter can be purchased here.
The Microsoft Windows drivers can be found here.
For detailed instructions for installing the USB to serial adapter click here.
Installation Help: http://www.ftdichip.com/Support/Documents/InstallGuides.htm