USB Serial Port: How to setup an RS232 serial link through a USB port.
USB 2.0 RS232 DB9 Serial Port Cable Adapter High Data Transfer Rate 1Mbps | eBay
1505 - USB to fiber optic serial interface - Taylor Electronics
USB TO SERIAL CABLE
Amazon.com: Eagle Electronics Mini USB to Serial Converter Prolific Chipset PL2303HXD (Mini USB to Serial Converter Prolific Chipset PL2303HXD) : Electronics
USB to RS232 Serial over Cat5 Extender Kit(FTDI CHIP)
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MILTECH 16SER - MIL-STD IP68 rugged military-grade Serial over USB unit - MilSource - Military Ethernet Switch and Router Products
Amazon.com: SerialGear USB RS-232 Industrial Adapter Isolated and Surge Protected FTDI Chip : Electronics
How to Connect the BeagleBone Black via Serial over USB - dummies
USB to Serial-Over-RJ45 Module
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Tripp Lite 5ft USB to Serial Adapter Cable (USB-A to DB9 M/M) - Kara Company, Inc.
AnyplaceUSB RS-232 Serial over IP Adapter
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How do USB to serial adapters work? - Electrical Engineering Stack Exchange
Moxa UPort 1110: 1 Port USB-to-Serial Adaptor, RS-232