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LukasMemberNovember 5, 2021 at 2:32 pm
the problem is that the CONTROLLINO digital outputs are only high-side switches. So they internally connects 12/24 V (when logical HIGH), but not the ground (when logical LOW). You need to add external pull down resistor between the communication line and the 0V. Recommended value of the resistor is 10 kOhm.