Shorting C1 Ground and timemark pins using led light

Hi!

Thanks for pointing out the 3.3V maximum voltage! That save me from frying my M2.

If I want to see how the time mark works I can just follow the general illustration I made below, make sure satellites are properly communicating with the M2 and I should see the dip in signal in reachview, right?

As you pointed out maximum of 3.3v, what could be the least voltage that will trigger the time mark?

Thanks.

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