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3ft USB to Serial Cable/RS232 Adapter - Serial Cards & Adapters | StarTech.com Europe
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USB to RS232 Converter - 6ft - CAB-11304 - SparkFun Electronics
USB to 4-Port RS-232 DB9 Serial Interface Adapter - Sealevel
USB C to Serial Adapter w/ COM Retention - Serial Cards & Adapters | StarTech.com
USB to 2-Port Isolated RS-232, RS-422, RS-485 DB9 Serial Interface Adapter - Sealevel
