8 ports 10/100 Base-TX + 4 ports RS232 Managed Industrial Ethernet Switch. IT-ES618-IM-4D(RS-232) is an industrial, management, redundant industrial Ethernet switch and integrates 4 port RS232 serial device server, support 8 ports 10/100M Ethernet (RJ45), 4 ports RS232, 2 redundant 12~48VDC power input and 1 relay alarm output. It adopt SW-Ring™ redundant technology (Recovery time
