Pool Lighting strange DMX wiring - RGB on 2 wires?

[RSinn]

I'm looking to control some pool lights with DMX. I'd prefer to use the branded pool equipment for safety reasons.

I'm used to having 230v to 24v DC power supply that connect to the input of a constant voltage DMX driver. The driver then outputs to the LEDs but the controller from the pool company is wired differently and I'm trying the understand why.

The diagram attached shows the 12V (AC) from the PSU and the light on the same connections to the DMX driver, so how does the driver change the power? why doesn't the LED just take the power direct from the transformer/power supply. Seems odd to me that the power doesn't go through the controller so how does it control it? Is it something to do with it being AC not DC.

Further spanner in the works is it being RGB on 2-wires, I thought this took 4-wires??

[Jonathan Dixon]

Given the DMX adapter is termed a "Modulator" I presume it is re-encoding and transmitting the control signal onto the 12v AC supply line, which the individual light fixtures can decode and read. (Akin to an ethernet-over-power modulator)

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[Rob.no1]

Cant answer your question specifically, but I used these PU2 pool lights from Certikin and they worked in the traditional way using a 350ma constant current dmx controller controlled by loxone:

https://parts4tubs.co.uk/product/pu2mlp-mini-led-rgbw-24v-light-s-s-fascia-concrete-pools-1-5-push-fit-c-w-20m-cable/?gad_source=1&gad_campaignid=21703084977&gbraid=0AAAAA-LHA3r0WvywfB-vyi4JKWf_vZWm7&gclid=Cj0KCQjw8cHABhC-ARIsAJnY12xbYQSQOMzzQ9bSkm5GezFK4s10lPfsGAKrMrGWnXPIwBGpZ0Oe_kMaAuBrEALw_wcB

not sure if this might be an option for you?

[RSinn]

" re-encoding and transmitting the control signal onto the 12v AC supply line, which the individual light fixtures can decode and read"

yes this seems correct, especially as you can do RGB on 2-wires. very expensive luminaires, but also seems crazy that you embed that tech in each  luminaire rather than letting a central controller do it with a dumb  luminaire on the end. Perhaps its a hang-up from pre-LED days.

" PU2 pool lights from Certikin and they worked in the traditional way using a 350ma constant current dmx controller"

i'll take a look. thanks.

[Techdoctor]

It looks like the DMX modulator is no longer being produced its not mentioned on either the AstraPool website or the Fluidra website. Though many pool shops are still selling it.