Interfacing barcode scanner with microcontroller
For receiving USB input from the barcode scanner, your microcontroller board must support USB host mode, or OTG mode (USB On The Go, which can be switched between Host and Device mode). The Netduino Plus 2 does not have a host-mode USB interface.

Instead of the Netduino, consider using a microcontroller board which does support host-mode or OTG USB.

Alternatively, use the RS232 interface of the scanner, level shift the voltages as required, and use standard serial input on the MCU board.



See also this answer, for more information and some options on USB Host Mode / OTG, albeit in the context of the Arduino, not the NetDuino.