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I'm not going to continue to debate and debacle the fact that what "does" work and what is supposed to happen are two different things. Just because I could drive 120mph in my car doesn't mean I will.
Most hobbiests don't have a few hundred to drop on a scope and would rather just have a...
Going back to the OP's intented question:
A DMX source in the middle of a LONG line of DMX cabling in either direction. This application requires a splitter. Or an additional few hundred feet of cabling.
If you're up to soldering something yourself, you could make something for the $10 mark...
To chime in my two cents. Disclaimer: I use and sell products for pDMX.
pDMX is NOT USITT Compliant. Power Over DMX was never in the DMX wiring spec.
Splitting the data as David suggested can work but will place additional load on your drivers. If your drivers stop working, if you have data...
I did all of mine by hand, however it was a bit slow. I'd reccomend the griddle method as it's VERY fast once you get the knack of it.
Kirk, I would be EXTREMELY careful leaving the boards on your griddle for the entire cooldown cycle. Solder needs to cool relatively quickly for a good joint...
One story I've heard of and do not reccommend:
User opened up access panel to streetlight, found simple wire running from power in ground to light up top, wired a switch in series, turns the light on and off at their choosing.
Usual Disclaimer, none of these are smart ideas.