It's a Martin Robocolor PRO 400.
The manual says that values over 252 is "Lamp off", but only in "MODE 3" which is set by a dip switch internally in the fixture. The default mode should be 1, which I would guess it is. I would think that even though it was set to Mode 3, I would hear the fixture change the other things like the gobo/colors etc, when it got a valid signal?3
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