StarTech.com 6 ft Professional RS422/485 USB Serial Cable Adapter w/ COM Retention (ICUSB422) - serial adapter - USB - RS-422/485
StarTech.com 6 ft Professional RS422/485 USB Serial Cable Adapter w/ COM Retention (ICUSB422) - serial adapter - USB - RS-422/485

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Add an RS422/485 serial port to your system through USB; features COM port retention.