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How should I decide the pulse width of DLP4500 external trigger

hello, my name is Jumpei, university student.

Now I use DLP Light Crafter 4500 by GUI.

and I want to use if in slave mode (displaying images when external trigger input).

I want to display 2 patterns alternately every 250 us.

However, i dont know how to decide the width of trigger pulse.

I tried to drive it by 20 ns pulse, into Trig_In_1 of J11 2 Pin, but it didnt move (display nothing)

Then, could anyone help or advice me?

I really hope to replying soon.

Thank you.