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FTDI Type C RS232 Serial Adapter Converter Plug Board With TXD, RXD, CTS,RTS, DCD, DSR, DTR, RI, GND, VCC - AliExpress
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USB Type C to DB-9 Adapter Cable - 1.5m long : ID 5446 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: Cable Matters USB C to Serial Adapter Cable (USB-C to Serial, USB C to DB9, USB C to RS232) 3 ft - Thunderbolt 4 / USB4 / Thunderbolt 3 Port Compatible
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