... that can be used to convert any standard USB port (USB 2.0 – backward compatible) into two RS ... grade design, adds two RS-232 ports to USB port, compatible with MDT,PND.• FTDI 232BL single ... indicators• USB1.1/2.0 Full Spead Compliant• USB-No IO, IRQ or DMA addresses Required,no ... Mac, and Linux. Industrial Grade, FTDI solution,USB to Dual RS232 converter / adapter /serial cable, applicable to PND