How to output a signal after marking with an external trigger?

in FAQs about Laser Marking, ,

Standard V4 card connect connected to an external trigger for marking, how to output a signal after marking?

Param (F3)Port, connect both ends of the foot switch to the IN4 and GND pins, trigger the foot switch to start marking, after the marking is completed, the OUT4 pin of the board will output a 200ms high-level pulse signal.

As shown in the figure:

high-level pulse signal

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