Relay activation from Aux2 (open collector) startup state

[Insect]

CNC760 board + relay board from cnc4pc

My Aux 2 relays (two off of one output) are open collector, they energize upon startup, then will follow the spindle command. Temporarily I have set it up to be a closed circuit when the relay is not-activated. These control the spindle activation and spindle cooling air. This means when I power the board down, it activates the spindle/air for 1 second before losing power.

Now moving to a relay for the spindle release (ATC). This one is more delicate, I can't have it throwing tools on startup or shutdown. How can we determine that the board shall not activate the output until everything is on, and it's asked to?

Thanks,

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