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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
By emitter, you mean the actual DMX light?
Personally, I'd say that was a faulty light and you should try and get it replaced. Is it possible the light was meant for 110v systems and you were running it on 220v? Hard to tell from the picture but it looks like the capacitor is either in the power supply, or the circuitry that drives the light itself.
Thing is, DMX is just a communications system - it shouldn't be supplying any power down the DMX lines - see what wikipedia says.
To test it's working, you really need an oscilloscope (even if it's only a cheap hand-held one) put between pins 2 and 3. When it is outputting data you should see some signals coming out of it.
You shouldn't be able to send anything down DMX that'd blow up the light though - that's just crazy. So as far as the wiring on the DMX shield goes, it'll either work or it won't depending on the wiring - although I wouldn't recommend keeping it powered up in the 'not working' state for long at all, as the Espruino and DMX shield will be fighting each other - both trying to output different voltages on the same wire.