... used to convert any standard USB port (USB 2.0 – backward compatible) into two RS-232C ports ... . The unit uses the latest FTDI chipset and is fully compatible ... design, adds two RS-232 ports to USB port, compatible with MDT,PND.• FTDI 232BL single ... , Mac, and Linux. Industrial Grade, FTDI solution,USB to Dual RS232 converter / adapter /serial cable, ...