133388 DB9 to RJ45 adapter Model Number 133388 SKU 13338807101 Serial (DB9) female x 1 RJ45 female x 1 RJ45 interface assigned with 8 pins, serial interface individually assignable Serial female port with screws The 133388 is DB9 (Serial) to RJ45 assembly adapter can be used to expand a serial interface by using an optional networking cable. The adapter allows for custom serial pin out configurations. Thereby one can set the pin assignment individually.