USB to Serial adapter for the FLEX-6000 series – FlexRadio
USB to RS232 Serial Converter -- DataPro
Tripp Lite Keyspan High Speed USB to Serial Adapter 3ft USB Cable TAA - USA-19HS - -
Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
Tripp Lite FTDI USB to Serial RS-232 Adapter Cable w/ COM Retention M/M 5ft - U209-005-COM - -
USB to Serial RS-232 DB9 Adapter Cable 8900110 Accessories - JULABO USA
USB to Serial Adapter Cable
Amazon.com: TRENDnet USB to Serial 9-Pin Converter Cable, Connect a RS-232 Serial Device to a USB 2.0 Port, Supports Windows & Mac, USB 1.1, USB 2.0, USB 3.0, 21 Inch Cable Length,
Pololu USB-to-Serial Adapter
USB to RS-232 Serial Adapter DB9 - 8 Inch Short Cable
Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable | Eaton
ATEN UC232A USB to Serial Converter (5-Pack) UC232A5PK B&H Photo