4-Port USB to RS-232 Serial Adapter Hub
Keyspan RS232 to USB-A Adapter, DB9, 3-ft Cable | Eaton
USB 2 to Industrial 4-Port RS232-422-485 Serial TB Adapter - Coolgear
4-Port USB to RS232 Converter DB9 | Black Box
8-Port USB to RS-232 Serial Adapter Hub
4-Port USB to RS-232 Hub - UC2324, ATEN Converters | ATEN Corporate Headquarters
010845 PoweredUSB 4-Port Hub with RS232 – CyberData Corporation
4 Port USB to DB9 RS232 Serial Adapter - Serial Cards & Adapters | StarTech.com
Gearmo USB 8 Port Serial RS232 featuring FTDI Chipset with LED Indicators
Startech.com 8 Port Serial Hub Usb To Rs232/rs485/rs422 Adapter, Industrial Usb 2.0 To Db9 Serial Converter Hub, Ip30 Rated, Din Rail Mountable Metal Serial Hub, 15kv Esd Protection - 6ft Locking -
StarTech.com 4 Port Serial Hub USB to RS232/RS485/RS422 Adapter, Industrial USB 2.0 to DB9 Serial Converter Hub, IP30 Rated, Din Rail Mountable Metal Serial Hub, 15kV ESD Protection - 6ft Locking Cable
Insignia™ 1.3' USB-to-RS-232 (DB9) PDA/Serial Adapter Cable, with Prolific Chipset Black NS-PU99501 - Best Buy
Parallax USB to Serial (RS-232) Adapter with Cable - Parallax
4-port USB to Serial RS232 Converter
StarTech 4-Port USB to Serial Adapter Hub with COM ICUSB2324X
4-Port USB to Serial RS232 Hub | TRENDnet - TRENDnet TU-S4
USB to TTL RS232 RS485 Serial Port Converter Board 3 USB HUB Splitter Expansion|Computer Cables & Connectors| - AliExpress
USB to RS232 Hub (4-Port / Industrial) – CommFront
