... well as parallel and USB ports on some models.Compatiblewith most Windows operating systems. No IRQ ... address, DMA ormemory address requirements. Serial port models require no external power. Modelswith USB output ... powered- no external power needed on USB to serial models Standard Accord USB1.1 or 2.0, ... DTR, DSR, DCD, RI, GND Asynchronism, point to point or multi-point Band rate 300-115200bps, automatic ...