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  1. Qt
  2. QTBUG-69188

Faulty timeout in qmodbusrtuserialmaster_p.h

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Details

    • Bug
    • Resolution: Done
    • P2: Important
    • 5.12.0 Beta 3
    • 5.9.6
    • SerialBus: MOD Bus
    • Distribution: Yocto Version: 2.4 (rocko)
      Hardware Platform: Embedded platform with PHYTEC core module.
    • Linux/Other display system
    • fcf05e2399a2d94af1c6a907221a95e3ab96ed1d (qt/qtserialbus/5.12)

    Description

      We use for our project qt5 with the following components:
      GUI, Modbus, DBus, Qml, SQL, etc. The event-loop processes all named components. At the moment we have the problem with the Modbus. We get the following debug output:

      15:28:31.723 [debug] qt.modbus.lowlevel: (RTU client) Sent Serial ADU: 0x0110006000060c0000ffffffff00000000000012f3

15:28:31.749 [debug] qt.modbus.lowlevel: (RTU client) Response buffer: "0110006000064015"

15:28:31.750 [debug] qt.modbus: (RTU client) Received ADU: "0110006000064015"

15:28:31.752 [debug] qt.modbus: (RTU client) Send successful: 0x10006000060c0000ffffffff000000000000

15:28:36.641 [debug] qt.modbus: (RTU client) Receive timeout: 0x10006000060c0000ffffffff000000000000

      It seems that the Modbus Response has arrived faster than switching to the "Receive" state.

      case Send: // class QModbusRtuSerialMasterPrivate
 ....
 } else {
  qCDebug(QT_MODBUS) << "(RTU client) Send successful:" <<  
  m_current.requestPdu;
  m_state = Receive;
  m_responseTimer.start(m_responseTimeoutDuration);
  }
  break;

       Modbus Settings:

      Parity: even
Baudrate: 115200 Bd
Databits: 8
Stop bits: 1
Response Time: 200 ms
Number of retries: 0 

      Attachments

        1. bug_qt_modbus.txt
          1 kB
          Yevgeniy Ruts
        For Gerrit Dashboard: QTBUG-69188
        # Subject Branch Project Status CR V
        221549,4 Fix RTU Master ignoring responses due to being in Send state 5.12 qt/qtserialbus Status: MERGED +2 0

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          People

            ablasche Alex Blasche
            yruts Yevgeniy Ruts
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            Dates

              Created:
              Updated:
              Resolved:

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