Installing drivers for RS-485 adapter
RS-232 adapter
If you use RS-485 adapter to RS-232 port, it is not necessary to install any drivers because serial connection on RS-232 port is enabled by default in Windows.For this purpose it is necessary that the PC has free and valid RS-232 port (COM port). This port on the PC is recognized by the 9-pin (male) connector on the back of the PC case.
USB adapter
NIGOS RS-485 to USB adapter uses USB FTDI CDM drivers which are available for download on this link: http://www.ftdichip.com/FTDrivers.htm