RS-232 to RS-485/422 Serial Interface Converter. Changing line signals is no longer a problem! StarTech.com s IC485S [IC485SIS] converts RS-232 serial interfaces to RS-485/422 serial interfaces for trouble free data transmission. This 2-in-1 converter converts RS232C to either the RS-485 or RS-422 interface, and is DCE/DTE mode selectable with the flip of a switch. Other features include selectable modes, point-to-point multidrop configuration and RS 485/422 monitor mode. This serial interface converter is made of high grade plastic for durability in most environments and supports connections up to 4000 ft, with data transfer rates up to 1MB/sec. Comes with a 9V power adapter or draws power on its own.