My question is: since it has pcb pins on the bottom, why does it also have screw too? I can't think of a clear advantage of using them both? Will that be a small PCB the encoder is soldered to and then the encoder is mounted behind a panel with the
screwnut. Then the wires from the small PCB can go to a main PCB?
Yes, just allows the designer more choices for where to mount the encoder Vs where the main logic board is placed.
Lefty