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StarTech.com 1 Port RS232 to Ethernet IP Converter / Device Server - Aluminum - Serial over IP Device Server - Serial to IP Converter (NETRS2321P) : Electronics - Amazon.com
4-Port Industrial RS-232 to Ethernet Data Gateway TCP/IP - Coolgear
Redirect Serial to Ethernet or network to Virtual COM Port
Serial RS232 to Ethernet Converter TCP IP Server Module Support DHCP / DNS | eBay
1 Port Serial Ethernet Device Server PoE - Serial Over IP Cat5/6 Extenders | StarTech.com Europe
Serial IP extender remote access connect RS232 device TCP network
C-6200AKB-P RS232 Serial to Ethernet Converter EtherNet/IP POE - rfIDEAS-shop
Rail-Mount Serial Server, RS232/485/422 to RJ45 Ethernet Module, TCP/IP to serial, With POE Function (WS-23626)