Very interesting.  Thanks, Frank!

This suggests an even simpler and lower-cost solution:

4.1  Connect the output of a logic-level device (examples in 4 above) to 
the high side of the trigger,
and the ground of the device to the marker ground (the low side of the 
trigger would be convenient).

The logic levels don't matter as long as "high" is high enough that the 
marker doesn't interpret it as "low" and not so high that it blows 
something (unlikely),
and "low" is ground level.



On Wednesday, October 8, 2014 2:38:02 PM UTC-4, Frank Pittelli wrote:
>
> The switch on the e-trigger is a standard active-low input to 
> a micro-processor I/O port 

...

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