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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

Public Types

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

Public Functions

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

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


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.

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