Need some assistance. I have two arduinos communicating well when I connect the PLC's with 220V AC. When I remove the 220V AC and power the boards individually with 12V as per the instruction I do not get any communication. I checked that the PLC output power is at 5V. Do I need to put DC power on the communications line also? According to the data sheet the PLC unit should work without power on the line.
PLC not working without AC powerPLC
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