4-Pack DB9 Female to Female Gender Changer, 9 Pin D-SUB RS232 Serial Port Coupler Adapter for Serial Communication Devices, PLC Controllers, POS Equipment

This 4-pack DB9 female to female gender changer is a practical RS232 serial port coupler for industrial and commercial serial wiring. It connects two DB9 female-ended serial cables together to extend serial connection distance or adjust interface gender without replacing whole serial cords. With complete 9-pin pin conduction, it maintains intact serial data transmission and works stably with PLC industrial controllers, POS cash registers, monitoring hosts, serial testing instruments and other RS232 devices. The compact mini structure saves much space inside AV cabinets and equipment gaps, making cable arrangement tidier. No extra power supply or complicated driver installation required.

Just plug serial cables into both sides to establish instant serial communication. Ideal for factory automation equipment, retail POS systems, security monitoring stations and laboratory serial testing projects.