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| ** This file is part of the QtSerialBus module of the Qt Toolkit. |
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| |
| #include "qmodbusrtuserialslave.h" |
| #include "qmodbusrtuserialslave_p.h" |
| |
| #include <QtCore/qloggingcategory.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| /*! |
| \class QModbusRtuSerialSlave |
| \inmodule QtSerialBus |
| \since 5.8 |
| |
| \brief The QModbusRtuSerialSlave class represents a Modbus server |
| that uses a serial port for its communication with the Modbus client. |
| |
| Communication via Modbus requires the interaction between a single Modbus |
| client instance and multiple Modbus server. This class provides the Modbus |
| server implementation via a serial port. |
| |
| Since multiple Modbus server instances can interact with a Modbus client |
| at the same time (using a serial bus), servers are identified by their |
| \l serverAddress(). |
| */ |
| |
| /*! |
| Constructs a QModbusRtuSerialSlave with the specified \a parent. The |
| \l serverAddress preset is \c 1. |
| */ |
| QModbusRtuSerialSlave::QModbusRtuSerialSlave(QObject *parent) |
| : QModbusServer(*new QModbusRtuSerialSlavePrivate, parent) |
| { |
| Q_D(QModbusRtuSerialSlave); |
| d->setupSerialPort(); |
| } |
| |
| /*! |
| Destroys the QModbusRtuSerialSlave instance. |
| */ |
| QModbusRtuSerialSlave::~QModbusRtuSerialSlave() |
| { |
| close(); |
| } |
| |
| /*! |
| \internal |
| */ |
| QModbusRtuSerialSlave::QModbusRtuSerialSlave(QModbusRtuSerialSlavePrivate &dd, QObject *parent) |
| : QModbusServer(dd, parent) |
| { |
| Q_D(QModbusRtuSerialSlave); |
| d->setupSerialPort(); |
| } |
| |
| /*! |
| \reimp |
| */ |
| bool QModbusRtuSerialSlave::processesBroadcast() const |
| { |
| return d_func()->m_processesBroadcast; |
| } |
| |
| /*! |
| \reimp |
| |
| \note When calling this function, existing buffered data is removed from |
| the serial port. |
| */ |
| bool QModbusRtuSerialSlave::open() |
| { |
| if (state() == QModbusDevice::ConnectedState) |
| return true; |
| |
| Q_D(QModbusRtuSerialSlave); |
| d->setupEnvironment(); // to be done before open |
| if (d->m_serialPort->open(QIODevice::ReadWrite)) { |
| setState(QModbusDevice::ConnectedState); |
| d->m_serialPort->clear(); // only possible after open |
| } else { |
| setError(d->m_serialPort->errorString(), QModbusDevice::ConnectionError); |
| } |
| return (state() == QModbusDevice::ConnectedState); |
| } |
| |
| /*! |
| \reimp |
| */ |
| void QModbusRtuSerialSlave::close() |
| { |
| if (state() == QModbusDevice::UnconnectedState) |
| return; |
| |
| Q_D(QModbusRtuSerialSlave); |
| if (d->m_serialPort->isOpen()) |
| d->m_serialPort->close(); |
| |
| setState(QModbusDevice::UnconnectedState); |
| } |
| |
| /*! |
| \reimp |
| |
| Processes the Modbus client request specified by \a request and returns a |
| Modbus response. |
| |
| The Modbus function \l QModbusRequest::EncapsulatedInterfaceTransport with |
| MEI Type 13 (0x0D) CANopen General Reference is filtered out because it is |
| usually Modbus TCP or Modbus serial ASCII only. |
| |
| A request to the RTU serial slave will be answered with a Modbus exception |
| response with the exception code QModbusExceptionResponse::IllegalFunction. |
| */ |
| QModbusResponse QModbusRtuSerialSlave::processRequest(const QModbusPdu &request) |
| { |
| if (request.functionCode() == QModbusRequest::EncapsulatedInterfaceTransport) { |
| quint8 meiType; |
| request.decodeData(&meiType); |
| if (meiType == EncapsulatedInterfaceTransport::CanOpenGeneralReference) { |
| return QModbusExceptionResponse(request.functionCode(), |
| QModbusExceptionResponse::IllegalFunction); |
| } |
| } |
| return QModbusServer::processRequest(request); |
| } |
| |
| QT_END_NAMESPACE |
| |
| #include "moc_qmodbusrtuserialslave.cpp" |