2, 4 AND 8 CHANNEL RS-232 TO RS-422 CONVERTERS These 2, 4 and 8 channel RS-232 to RS-422 converters allow your computer to communicate up to 4,000 feet by converting the RS-232 signal to RS-422. View and compare our RS-232 to RS-422 converters below. Click on each model for a photo and see the Details, Specs, and Download tabs for further information.