The IT-ES618-IM-4D(RS-485)-P(12/48VDC) is an industrial, management, redundant industrial Ethernet switch and integrate 4 ports RS485/422 serial device server, it support 8 ports 10/100M Ethernet (RJ45), 4 ports RS485/422, 2 redundant 12~48VDC power input and 1 relay alarm output, it adopt SW-Ring™ redundant technology (Recovery time