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FTDI Serial USB RS232 Adapter 4 port Din Rail Industrial - Shentek
USB 2 to Industrial 4-Port RS232-422-485 Serial TB Adapter - Coolgear
Industrial USB to 4 Port RS232 Converter / Adapter
FTDI Serial USB RS232 Adapter 4 port Din Rail Industrial - Shentek
Industrial USB to 4 Port RS232 Converter - ATC 804 – Grid Connect
4 Port Professional RS-232 USB 2.0 to Serial Adapter
Amazon.com: StarTech.com 4 Port USB to Serial RS232 Adapter - Wall Mount - Din Rail - COM Port Retention - FTDI USB to DB9 RS232 Hub (ICUSB2324I) : Electronics
Moxa UPort 2410, USB to 4-port RS232 Converter
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
4 Port Professional RS-232 USB 2.0 to Serial Adapter