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USB 2.0 to RS485/RS422/DB9 converter It easily lets you connect RS485 or RS422 or DB9 device directly to your Laptop PC computer USB port Stable and reliable Prolific PL2303 Real USB 2.0 specification compliant for faster and steadier data communication. TIA/EIA RS-485/RS-422 standard compliant Transmit distance reach up to 1219m. (The longer distance, the lower rate.) Ideal connections to Modem, PDA, GPS, Bar Code, Digitizer, Digital Camera, Label printer & ISDN terminal adapter, etc. Supports Windows 2000/XP/Vista/7/8/Server 2003/2008, RedHat 7.3/8.0/9.0, Kernel 2.4.10 or above & Mac OS 8 or above.