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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtSerialBus module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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);
}
#include "moc_qmodbusrtuserialslave.cpp"
QT_END_NAMESPACE
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