Thanks divsys and Jinx for your advice
So as you mentioned WS2815 doesn’t have clk cable and just data cable (green) and backup cable (blue)
So based on your suggestion I should connect white (GND) a blue (BI) cables from JST connector to the GND output of the controller , green cable (DI) to Data 1 from the controller . Red cable (+) shouldn’t be connected since I would directly inject the power from power supply (after going through the 5 amps fuse)
Then connect the JST connector with the Led Strip connector , as shown on the next two photos
Please could you confirm me if this would be the correct wiring.
Finally is this video it is recommended how to connect the backup signal from WS2815 to the controller . It’s suggested that in case led strip is far away from controller in other to avoid interference not to connect the backup signal together with the GND at the output of the controller but to the GND as close to the led strip pins.
But if controller and led strip are close (close) BI and GND could be directly connected to the GND out of the controller (this would my case)
I don’t if you agree with this suggestion
Thanks again for your advice .
Regards