4-Port USB to RS-232 Hub - UC2324, ATEN Converters | ATEN Corporate Headquarters
RS-232 COM Port Header Cable - AT/Everex - 2.0 mm | OnLogic
2-Port PCI RS232 Serial Adapter Card DB9 - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com
8-Port USB to RS-232 Serial Adapter Hub
1-Port RS-232/422/485 Secure Device Server with PoE - SN3401P, ATEN Secure Device Servers | ATEN Corporate Headquarters
Amazon.com: Portserver Ts 4PORT RS-232 Serial to Ethernet Device Server : Electronics
What is serial (RS232) port interface - PBXDom
Amazon.com: StarTech.com 1 Port RS-232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (NETRS232), Black : Electronics
8-Port USB 2.0 to RS-232 DB-9 Industrial Serial Adapter w/ FTDI Chipset & 15kV ESD Surge Protection - Coolgear