This is a MALE to MALE 5 pin cable for Carousel Projectors.  Tested all pins with ohmmeter for proper conductivity.  Custom made cable.  Approx 9.5 ft.

Inherited this with some gear from a semi-pro AV guy.    With just one projector of my own - I don't know exactly what this is used for.  I can only guess to daisy chain multiple projectors somehow?