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4-Port USB to RS-232 Serial Adapter Hub
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USB to 8-Port RS-232 RJ45 Serial Interface Adapter - Sealevel
4-Port USB to Serial RS232 Hub | TRENDnet - TRENDnet TU-S4
2 Port USB 2.0 to Serial Adapter Hub - Serial Cards & Adapters | StarTech.com
4 Port USB to RS232 Serial Adapter Hub - Serial Cards & Adapters | StarTech.com
Moxa UPort 1130I: 1 port USB-to-Serial Hub, RS-422/485, Isolation
StarTech.com USB to RS232/RS485/RS422 Industrial 4 Port Serial Hub Adapter - USB to Serial Converter - ICUSB234854I - USB Adapters - CDW.com
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IC1020A, USB Serial Hub MP - Black Box
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StarTech 4-Port USB to Serial Adapter Hub with COM ICUSB2324X
StarTech.com ICUSB2324 USB to Serial Adapter Hub - 4 Port - Bus Powered - DB9 (9-pin) - USB Serial - FTDI USB to Serial Adapter - Newegg.com
RocketPort USB Serial Hub 4-Port|USB Serial Hubs | COMTROL
StarTech.com 8 Port USB to RS232 Serial DB9 Adapter Hub - Q16087 - Shoplet.com
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StarTech 2-Port USB to Serial Adapter Hub with COM ICUSB2322X
Gearmo USB 8 Port Serial RS232 featuring FTDI Chipset with LED Indicators
High Quality Usb To 16 Ports Serial Converter Usb2.0 To Rs232 Rs-232 Adapter Hub Ftdi Chipset - Add On Cards & Controller Panels - AliExpress
StarTech.com USB to RS232/RS485/RS422 8 Port Serial Hub Adapter - Industrial Metal USB 2.0 to DB9 Serial Converter - Din Rail Mountable - Industrial 8 port serial hub 15kV Level 4 ESD -
16 Port RS-232 Rack Mountable USB to Serial Adapter - Coolgear
StarTech.com ICUSB23216FD USB to Serial Hub - 16 Port - COM Port Retention - Rack Mount and Daisy Chainable - FTDI USB to RS232 Hub - Newegg.com