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This DB9 Female to RJ45 Female adapter converts standard RS232 COM serial port into RJ45 network interface. It allows you to use common CAT5/CAT6 Ethernet cables to extend serial port signals conveniently. Adopting precise internal pin mapping and anti-interference construction, it ensures steady data transmission without signal attenuation. Small and easy to install, no configuration needed. Perfect for industrial control wiring, equipment debugging, cabinet wiring arrangement and long-distance RS232 serial communication extension.