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  1. Qt
  2. QTBUG-62192

MODBUS custom command doesn't work

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    • 2c0bb738e988d84f36169e0103d051745b678479 (qt/qtserialbus/dev) 17ac276e9b4fcde0f2e2b9a68a01ef6cdde31cf5 (qt/tqtc-qtserialbus/tqtc/lts-5.15)

       I'm trying to send custom MODBUS request but each time I get an empty data in reply, although I see the correct result in the logs (ADU, PDU).

          auto cmd = QModbusPdu::FunctionCode(0x42);
    auto request = QModbusRequest(cmd, QByteArray::fromHex("00080f"));
    QModbusRequest::registerDataSizeCalculator(
                cmd,
                [](const QModbusRequest &)->int {
        return 19;
    });
    /*
       request.registerDataSizeCalculator(
                cmd,
                [](const QModbusRequest &)->int {
        return 19;
    });
    */

... send rawRequest ...

qDebug() << "data"
         << reply->rawResult().data()
         << "code"
         << reply->rawResult().functionCode();

// data "" code 0

        For Gerrit Dashboard: QTBUG-62192
        # Subject Branch Project Status CR V
        334035,6 Fix Modbus custom command size calculation dev qt/qtserialbus Status: MERGED +2 0
        336433,3 Fix Modbus custom command size calculation tqtc/lts-5.15 qt/tqtc-qtserialbus Status: MERGED +2 0

            heimrich Karsten Heimrich
            uralbash Dmitry S
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              Created:
              Updated:
              Resolved:

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