21.02.2022, 07:10
This usually means there's a problem on the physical bus level.
Make sure that parity and stop bits settings are correct. Check if GND is connected between LM and the Modbus device. A termination resistor might be needed as well. Also check AC polarity on both LM and the Modbus device. There was a report where one of the power supplies has AC polarity connected in reverse and this caused communication issues.
Make sure that parity and stop bits settings are correct. Check if GND is connected between LM and the Modbus device. A termination resistor might be needed as well. Also check AC polarity on both LM and the Modbus device. There was a report where one of the power supplies has AC polarity connected in reverse and this caused communication issues.