Control GPIO to trigger a strobe light

I’m using a Lucid Vision Labs PHX051S-C, which has a GPIO output line that I want to be able to drive high or low to control an attached strobe.

My first attempt looks like this, however per voltmeter there is no change to the output on Line1. Are there more settings that I may need to control to achieve this?

arv-tool-0.8 control \
    LineSelector=Line1 \
    LineMode=Output \
    LineSource=UserOutput0 \
    UserOutputSelector=UserOutput0 \
    UserOutputValue=True  # or False


If you are just using a voltmeter but nothing else connected to the output, it may explain why you are not seeing any change. An external voltage source is needed to see a state change.