4 Port Professional RS-232 USB 2.0 to Serial Adapter w/Nuts
Four-port USB to serial RS232 converter / adapter
4 Port Serial Hub USB to RS232 Adapter - Serial Cards & Adapters | StarTech.com
CableCreation USB to Serial 10ft Long Cable , USB to RS232 Adapter, USB to DB9, RS232 Converter 9-Pin FTDI Chipset for Windows , Mac OS and Linux - Walmart.com
USB 4-Port Serial Adapter / USB 2.0 Quad Port Serial DB-9 RS-232
4 Port Professional RS-232 USB 2.0 to Serial Adapter
Amazon.com: StarTech.com USB to Serial Adapter Hub - 4 Port - Wall Mount - COM Port Retention - Texas Instruments - USB to RS232 Adapter (ICUSB2324X), Black : Everything Else
4-port USB 2.0 to 4X RS232 serial cable splitter converter ZE552A(FTDI Chipset+win
FTDI Serial USB RS232 Adapter 4 port Din Rail Industrial - Shentek
FTDI Serial USB RS232 Adapter 4 port Din Rail Industrial - Shentek
4-Port USB to RS-232 Serial Adapter Hub
8 Port Serial Hub USB to RS232 Adapter - Serial Cards & Adapters | StarTech.com
FTDI Serial USB RS232 Adapter 4 port Din Rail Industrial - Shentek