Serial Ethernet Converter (RS232, 485, 422) - Industrial, 2 Ports
2-port StarTech.com Dual Port PCI Express Gigabit Ethernet Network Card Adapter - 2 Port PCIe NIC 10/100/100 Server A... | Dell USA
Industrial 2-Port RS-232 to Ethernet Data Gateway TCP/IP
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011236 2-Port USB Gigabit Switch – CyberData Corporation