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This 9-pin to DB9 female RS232 serial port bracket is designed to convert the onboard 9-pin serial header of the motherboard into a standard external DB9 COM port. Equipped with high-quality ribbon cable and metal chassis mounting bracket, it can be easily fixed on the computer rear expansion slot. It features accurate pin assignment and stable signal output, perfectly compatible with industrial equipment, PLC, serial modems, POS devices and debugging tools. Easy installation, no extra software required, an ideal accessory for desktop PCs without built-in DB9 serial port.