QModbusDeviceIdentification Class

The QModbusDeviceIdentification is a container class representing the physical and functional description of a Modbus server. More...

Header:	#include <QModbusDeviceIdentification>
qmake:	QT += serialbus
Since:	Qt 5.8

This class was introduced in Qt 5.8.

• List of all members, including inherited members

Public Types

enum	ConformityLevel { BasicConformityLevel, RegularConformityLevel, ExtendedConformityLevel, BasicIndividualConformityLevel, RegularIndividualConformityLevel, ExtendedIndividualConformityLevel }
enum	ObjectId { VendorNameObjectId, ProductCodeObjectId, MajorMinorRevisionObjectId, VendorUrlObjectId, ProductNameObjectId, …, UndefinedObjectId }
enum	ReadDeviceIdCode { BasicReadDeviceIdCode, RegularReadDeviceIdCode, ExtendedReadDeviceIdCode, IndividualReadDeviceIdCode }

Public Functions

	QModbusDeviceIdentification()
QModbusDeviceIdentification::ConformityLevel	conformityLevel() const
bool	contains(uint objectId) const
bool	insert(uint objectId, const QByteArray &value)
bool	isValid() const
QList<int>	objectIds() const
void	remove(uint objectId)
void	setConformityLevel(QModbusDeviceIdentification::ConformityLevel level)
QByteArray	value(uint objectId) const

Static Public Members

QModbusDeviceIdentification

fromByteArray(const QByteArray &ba)

Detailed Description

The Device Identification interface is modeled as an address space composed of a set of addressable data elements. The data elements are called objects and an ObjectId identifies them.

Member Type Documentation

enum QModbusDeviceIdentification::ConformityLevel

Defines the identification conformity level of the device and type of supported access.

Constant	Value	Description
QModbusDeviceIdentification::BasicConformityLevel	0x01	Basic identification (stream access).
QModbusDeviceIdentification::RegularConformityLevel	0x02	Regular identification (stream access).
QModbusDeviceIdentification::ExtendedConformityLevel	0x03	Extended identification (stream access).
QModbusDeviceIdentification::BasicIndividualConformityLevel	0x81	Basic identification (stream access and individual access).
QModbusDeviceIdentification::RegularIndividualConformityLevel	0x82	Regular identification (stream access and individual access).
QModbusDeviceIdentification::ExtendedIndividualConformityLevel	0x83	Extended identification (stream access and individual access).

See also ReadDeviceIdCode.

enum QModbusDeviceIdentification::ObjectId

This enum describes the possible server objects. The interface consists of three categories of objects:

Basic Device Identification. All objects of this category are mandatory.

Constant	Value	Description
QModbusDeviceIdentification::VendorNameObjectId	0x00	The vendor name of the device.
QModbusDeviceIdentification::ProductCodeObjectId	0x01	The product code of the device.
QModbusDeviceIdentification::MajorMinorRevisionObjectId	0x02	The product version numbering.

Regular Device Identification. All objects of this category are standard defined and optional.

Constant	Value	Description
QModbusDeviceIdentification::VendorUrlObjectId	0x03	The vendor URL of the device.
QModbusDeviceIdentification::ProductNameObjectId	0x04	The product name of the device.
QModbusDeviceIdentification::ModelNameObjectId	0x05	The model name of the device.
QModbusDeviceIdentification::UserApplicationNameObjectId	0x06	The user application name of the device.

Reserved range (i.e., ReservedObjectId >= ObjectId < ProductDependentObjectId). Do not use.

Constant	Value	Description
QModbusDeviceIdentification::ReservedObjectId	0x07	First value of reserved object Ids.

Extended Device Identification. All of these data are device dependent and optional.

Constant	Value	Description
QModbusDeviceIdentification::ProductDependentObjectId	0x80	First possible value of product dependent identifiers.
QModbusDeviceIdentification::UndefinedObjectId	0x100	Do not use.

enum QModbusDeviceIdentification::ReadDeviceIdCode

Defines the access type of the read identification request.

Stream access:

Constant	Value	Description
QModbusDeviceIdentification::BasicReadDeviceIdCode	0x01	Request to get the basic device identification.
QModbusDeviceIdentification::RegularReadDeviceIdCode	0x02	Request to get the regular device identification.
QModbusDeviceIdentification::ExtendedReadDeviceIdCode	0x03	Request to get the extended device identification.

Individual access:

Constant	Value	Description
QModbusDeviceIdentification::IndividualReadDeviceIdCode	0x04	Request to get one specific identification object.

Member Function Documentation

QModbusDeviceIdentification::QModbusDeviceIdentification()

Constructs an invalid QModbusDeviceIdentification object.

QModbusDeviceIdentification::ConformityLevel QModbusDeviceIdentification::conformityLevel() const

Returns the identification conformity level of the device and type of supported access.

See also setConformityLevel().

bool QModbusDeviceIdentification::contains(uint objectId) const

Returns true if there is an item for the given objectId; otherwise false.

See also ObjectId.

[static] QModbusDeviceIdentification QModbusDeviceIdentification::fromByteArray(const QByteArray &ba)

Converts the byte array ba to a QModbusDeviceIdentification object.

Note: : The returned object might be empty or even invalid if some error occurs while processing the byte array.

See also isValid().

bool QModbusDeviceIdentification::insert(uint objectId, const QByteArray &value)

Inserts a new item with the objectId and a value of value. If there is already an item with the objectId, that item's value is replaced with value.

Returns true if the size of value is less than 245 bytes and the objectId is less then QModbusDeviceIdentification::UndefinedObjectId.

See also ObjectId.

bool QModbusDeviceIdentification::isValid() const

Returns true if the device identification object is valid; otherwise false.

A device identification object is considered valid if ProductNameObjectId, ProductCodeObjectId and MajorMinorRevisionObjectId are set to a non-empty value. Still the object can contain valid object id's and associated data.

Note: A default constructed device identification object is invalid.

QList<int> QModbusDeviceIdentification::objectIds() const

Returns a list containing all the object id's in the QModbusDeviceIdentification object in ascending order.

See also ObjectId.

void QModbusDeviceIdentification::remove(uint objectId)

Removes the item for the given objectId.

See also ObjectId.

void QModbusDeviceIdentification::setConformityLevel(QModbusDeviceIdentification::ConformityLevel level)

Sets the identification conformity level of the device and type of supported access to level.

See also conformityLevel().

QByteArray QModbusDeviceIdentification::value(uint objectId) const

Returns the value associated with the objectId. If there is no item with the objectId, the function returns a default-constructed value.

See also ObjectId.