Amazon.com: StarTech.com 1 Port RS232 to Ethernet IP Converter / Device Server - Aluminum - Serial over IP Device Server - Serial to IP Converter (NETRS2321P) : Electronics
SystemBase CS-428/9AT Mini2 | Mini RS232 | RS422 Wandler
LM060-0613 Lm Technologies, Adapter, USB/RS232-Wandler, FTDI | Farnell DE