I use this to connect two USB RS-232 cables (http://www.amazon.com/gp/product/B0007T27H8 /ref= ox_sc_sfl_title_5?ie=UTF8&psc=1&smid=ATVPDKIKX0DER). That works great. I tested them on Raspberry PI and Windows 7 64-bit.
USB to USB Type-C adapter
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