4 Port Professional RS-232 USB 2.0 to Serial Adapter
Vaisala RS-232/485-to-USB Cable Adapter
4-Port USB to RS-232 Serial Adapter Hub
USB to RS232 Converter - 6ft - CAB-11304 - SparkFun Electronics
Plugable USB to RS-232 DB9 Serial Adapter (Prolific PL2303HX Chipset) – Plugable Technologies
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USB 2.0 RS-232 Serial Adapter with LED Indicators
USB to RS-232 DB9 1-Port Serial Interface Adapter - Sealevel
USB to RS-485 DB9 1-Port Serial Interface Adapter - Sealevel
QCI-USB-RS485 - USB to RS-485 Converter
USB to 1-Port RS-422 DB9 Serial Interface Adapter - Sealevel
USB/RS-232 CARD
Marshall Electronics USB to RS-485/RS-422 Converter CV-USB-RS485
USB-RS USB-RS converter for programming SATEL devices
Amazon.com: UGREEN USB to RS232 Adapter Serial Cable DB9 Male 9 Pin with PL2303 Chipset RS-232 Converter Cable for Windows 10 8.1 8 7 XP Vista, Mac OS, Linux, 3FT : Electronics
Mini USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV ESD Protection & 3ft. USB Extension Cable
USB to RS-232 Converter Cable | Celestron
Single Port USB 2.0 to RS-422 / RS-485 DB-9 Serial Adapter - Coolgear
Parallax USB To Serial (RS-232) Adapter - Parallax
IOGEAR - GUC232A - USB to Serial Adapter
1 Port USB 2.0 to Serial Adapter Cable - Serial Cards & Adapters | StarTech.com
USB to Dual Serial RS-422 / RS-485 Industrial Adapter - Coolgear
