Looks like you are not getting many responses, so let me try to see if I can help.
You have already determined that you need an external relay and power supply, so that should allow you to separate the voltages of the two devices, so one does not "fry" the other.
ANSWER: Yes, this is correct. The solenoids are of various makes/models and are clearly marked. I can look up their proper operating voltages and current demands under load.
Given the vintage of the box, I would not expect much in the way of integrated circuits (maybe a 555 timer?) and would think that there might be more capacitor and resistor ciruits to determine the timing.
ANSWER: Correct again. These are mostly, if not completely, analog devices. I'll have to take one apart and look for timing circuits.
But do you really need to know what is inside the box, unless of course it does not work? Could you not just set it up, and using a voltmeter determine what contacts on the output drive the shutter solenoid when you trigger it? Or is there a piece here I am missing, or overlooking?
ANSWER: Right again... No I don't need to know the whole circuit schematic. I'm not intelligent enought to understand it anyway. Sorry I didn't state this clearly.
SPECIFICITY: The issue is multiple plugs/sockets performing multiple functions. The 2-pronged male output is easy to understand... obviously goes to the solenoid. The second socket is a female 3-pronged DIN-type and I'm assuming this sends "open/closed" data back to the controller?? The third 7-pronged socket is the most complicated, of course. I can only assume this sends data to some external monitoring device???
What I need to know is the "output wiring" of the two DIN style plugs. I can fiddle around and figure most of it out but, given the complexity of unknown functions, it's much easier if someone can provide existing data. What can I say? I'm lazy...
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