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This DB9 male to RJ45 female adapter converts standard RS232 9-pin serial port to RJ45 network interface. It enables you to use common Cat5e and Cat6 LAN cables to extend serial communication signals efficiently. Built with precise pin mapping and anti-interference structure, it maintains stable and reliable data transmission. Compact size for easy installation and wiring arrangement, plug and play for quick use. Ideal for industrial control, equipment configuration, cabinet wiring and long-distance RS232 serial extension projects.