USB to serial RS232 adapter with two ports
USB-to-serial adapter - Wikipedia
4 Port Professional RS-232 USB 2.0 to Serial Adapter
Industrial USB/RS232 USB/Serial PLC Programming W7 XP RS232 - PLCCable.com - Automation Supplies and PLC Tools
Dynex™ 16" USB PDA/Serial Adapter Cable Black DX-UBDB9 - Best Buy
4 Port Professional RS-232 USB 2.0 to Serial Adapter
USB to 8-Port RS-232 RJ45 Serial Interface OEM Board - Sealevel
USB Interface Cable(s) | Onset's HOBO and InTemp Data Loggers
Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable | Eaton
USB to Serial Adapter 1 Port RS-232 DB9, U-224, Synchrotech
1505 - USB to fiber optic serial interface - Taylor Electronics
USB C to Serial Adapter w/ COM Retention - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com
USB to RS-485 DB9 1-Port Serial Interface Adapter - Sealevel
Mini USB to Serial Adapter Hi-Speed 920K FTDI Chip
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1 Port USB 2.0 to Serial Adapter Cable - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com Mexico
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Amazon.com: HDE USB to Serial Interface Cable with Serial to RJ45 Console Adapter Cable for Cisco Routers : Electronics
USB to 8-Port RS-232 DB9 Serial Interface Adapter - Sealevel
High-Speed USB-to-Serial Adapter for Windows 8 32/64-bit - U.S.Converters
USB to 1-Port Isolated RS-232 DB25 Serial Interface Adapter - Sealevel
BAFO BF-810 USB 2.0 to RS232 Serial Convertor Type Connector DB9 9Pin Adapter | eBay
Amazon.com: TRIPP LITE USB to RS232 Serial Adapter Cable USB-A to DB25 DB9 M/M 5-Feet (U209-005-DB25) : Electronics
USB to RS232 DB9/DB25 Serial Adapter - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com
