the problem with trying to send the data on to another dumb string controller is when you're usung the cable to provide power for say a full flex strip, you max out the power in the cable that you can't much more more in the next device.
read my description of a "power injector" in the other thread.
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Loginwith each new injector added to the dmx string, it drops whatever power arrives from upstream, so it will not attempt to stretch the power to service additional dmx elements.
it does require that you budget your power consumption throughout the dmx string to know when a new injector is required.