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    Modbus poll algorithm

    Development general discussion
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    • P
      posztos last edited by

      Hi,

      I wanted to change the way modbus master polls the slaves, but as I see, it is implemented in seroutils...

      Now if all slaves are online, they are queried one after the other. If a slave goes offline, it is queried "retries" times in one round, then it is qualified offline.
      My version would always query each slave only one time in a round, and qualify a slave offline only if "retries" number of rounds has elapsed without a proper answer.
      It's not a big difference, but gives more time for the network to recover from a transient failure.
      I don't know, if this algorithm was suitable for other modbus users/uses, or could be implemented only as an option.

      Thanks,
      Greg

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      • M
        mlohbihler last edited by

        Hi Greg,

        That's not in seroUtils. You could make that change directly in the Modbus data source RT.

        Best regards,
        Matthew

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        • M
          mlohbihler last edited by

          Oh, sorry, it's not just the data source RT. It would be a combination of there, and the Modbus4J code (which is what creates the requests from the batch).

          Best regards,
          Matthew

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