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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.

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Pin 1 is unused. Pin 2 connects to ground to activate the shutter. Pin 3 connects to ground to activate autofocus. Pin 4 is ground.

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