... Industrial Grade, reliable applicable to kinds of OS PND,MDT support The USB to Dual RS232 converter/adapter ... is a port-powered USB to dual RS-232 ... converter that can be used to convert any standard USB port (USB 2.0 ... DSR, DCD, RI, and GND.• Data transfer rates from 300 Bps to 921,600 bps• Internal 128/385 Byte ...