Out of the box, Impinj doesn't provide a Windows 7 64bit native USB driver for the Indy Development Platform. So in the event that you receive a development board configured for USB, you will not be able to communicate to it from a Windows 7 machine.
In this video we will demonstrate the procedure to convert the Indy Development Platform from the USB mode to the UART mode so that it will operate properly on a Windows 7 64 bit operating system.
You will need to download the UART.bin file below.
Sam-Ba can be downloaded here: http://www.atmel.com/tools/ATMELSAM-BAIN-SYSTEMPROGRAMMER.aspx