ESR900 Series Industrial Ethernet Serial Server - One, Two or Four Ports This Ethernet to RS-232 and RS-485 Converter was designed especially for Industrial applications. Features like a thin-profile DIN mount case, IP30 rating, wide temperature range and wide range, redundant power supply make the Vlinx® ESR series Industrial Ethernet Serial Servers the best fit for industrial users. Buy and compare our Ethernet to RS-232 and RS-485 Converters below. Click on the model number to view a photo and see the Details, Specs, Downloads, Accessories, and Application tabs for further information.