... V1.1 2.0 Plug and Play.2.Operational system virtual serial port driver.3.USB to 4-Port RS-232 serial Supports Windows 95/98/Me, 2000 ... , 2003, XP, Vista,Win7, CE, Linux ,MAC.4.Field Interfaces: RS ... V2-,V2+ is only for power input backup) USB to serial converter/USB to 4-Port RS-232 Hub