To get rid of wrong packets, terminate the bus properly using BUS END switches at each end of the line. If this does not help, check the bus topology, bus length, cabling etc.
To get rid of wrong packets, increase Timeout in the Modbus protocol parameters. Default (for Domat I/O modules) is 70 ms, while some 3rd party devices may require up to 250...300 ms. Upload solution to apply changes.
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