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May 21, 2023 at 7:20 pm #171392
Make sure you have the correct connections. Some people don’t realize input and outputs are on opposite sides of the H90, not stacked above each other; a common mistake.
H90 Out 3 to Input 1 on H9
H90 Out 4 to Input 2 on H9
H9 Out 1 to Input 3 on H90
H9 Out 2 to Input 4 on H90