I'm pretty new to sending DMX signals to lights, so this might be a really basic question. Setting up DMX lights is hard enough, but I can't even get the fixture to show anything in the output. I've selected the 'input source' (both specific layers and the whole composition), but the output is still black. The "Dummy Fixture" and all regular 'screen slices' shows the output just fine with the same settings.
What do I need to do to make the fixture show the output from my composition?