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Screw terminal for all 9 pins. Anti-oxidation, better contacts. Female DB9 with screwlock/jack screws for mounting the adaptor board to a wall box or panel that has a DB9 cut-out. Simple and quick connections installation. These adapter boards can be mounted directly to the equipment without using extension cables. Used for experimentation or prototype work with RS-232 serial ports, I/O cards, and any other device that uses a DB9 connector. The breakout board can be used for automatic control equipment, industrial control equipment, cash register, tax control machine, computer, etc.