What am I overlooking and has anyone used a Max485 pair with a Pixelblaze? I am looking at
I have 12 long strands of ~250-380 Pixels of SK6812 GRBWW that are roughly 3m-8m away from the PBv3 regular and output expander boards. The signal and 12V power is carried through cat6. Of the 12 strips, about 4 are showing some “artifacts” where they will not always show the right color (often with a blue or white flicker). The output expander already has a 100 Ohm terminating resistor at the start of the signal and each strip has a high-quality capacitor from 12V to ground between the cat6 and the strip. I have looked at adding a resistor at the strip end but my oscilloscope shows no improvement in the signal. Using the 'scope on the strips with artifacts shows signs of 60Hz induction on the line. The cat6 is 100 Ohm impedance.
For a 485 chip, I’m looking at https://www.amazon.com/Gumps-grocery-MAX485CPA-MAX485-Transceiver/dp/B082182H7H or these Amazon.com
Does anyone have experience that can help? Do I leave the resistor on the output expander?