Setting up Strobe for RockPAR Tri

I am unable to get the strobe control in the default group controls to work properly with the RockPAR Tri fixture. Here is a link to the DMX control list.
https://www.rockvilleaudio.com/content/Manuals/ROCKPAR%20TRI_Manual_v2_OL.pdf?
Could you please explain how to set it up? Thanks!