I have a thermostat connected to network over ModBus TCP/IP protocol.
I am trying to read some data from that thermostat with no success.
Is there any good tutorial how to do that or can anyone help me?
SOLVED: In ModbusTCPSlave I/O Mapping menu i had wrong setting in "älways update variables" drop down manu. If you don't have any variables in program it has to be set on "Enable 2 (Always in bus cycle task)"
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