I put a 3-conductor 3.5mm jack on the Remote Shutter. It matches the 3-conductor 3.5mm plug on the Interface Circuit. The Interface Circuit will be mounted in the CF case.

I can unplug the Intervalometer and use the Remote Shutter in manual mode. Plug the Intervalometer in and take photos at any set repeating interval. The timer interval is set in whole seconds up to 24 hours.