What is the configuration for a D70s / MC-DC1 connector?

I have an old D70s, and I’d like to trigger it using the wired remote shutter port from a computerized device like a Sabre (which doesn’t provide an adapter for this camera) or an Arduino. The connector type is a MC-DC1. It’s used with a four wire remote, but Nikon doesn’t provide any technical specifications.

I imagine that, since there is no power source in the trigger, it’s as simple as shorting two wires together to trigger a shutter release. But what are the other two wires for? I also want to see if anyone has any experience with this before shorting wires together in case there is any possibility of damage.