Baitaihem USB to RS485 USB-485 DB9 Serial Port COM Adapter Converter Cable CH340 Chip Support WindowsXP Vista Windows 7/8 and 64-bit Win7 Win10 Ch340T chip supports the operating system XP Vista Windows 7/8 and 64-bit Win7 Win10 USB To RS485 Converter TVS surge protection Do not need external power supply Install Driver before plug in converter