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This DB9 male to screw terminal block adapter converts standard 9-pin D-SUB RS232 interface into easy-to-wire 9+1 pin terminal ports. No soldering is required; you can quickly connect, adjust and test serial signals via screw terminals. Built with accurate pin mapping for stable RS232 signal transmission. Equipped with a sturdy protective housing for insulation and durability, ideal for long-term industrial control, equipment debugging, circuit modification and serial port wiring projects.