class QModbusDeviceIdentification

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

Synopsis

Methods

• def __init__()

• def conformityLevel()

• def contains()

• def insert()

• def isValid()

• def objectIds()

• def remove()

• def setConformityLevel()

• def value()

Static functions

• def fromByteArray()

Note

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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.

class 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	Description
QModbusDeviceIdentification.VendorNameObjectId	The vendor name of the device.
QModbusDeviceIdentification.ProductCodeObjectId	The product code of the device.
QModbusDeviceIdentification.MajorMinorRevisionObjectId	The product version numbering.

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

Constant	Description
QModbusDeviceIdentification.VendorUrlObjectId	The vendor URL of the device.
QModbusDeviceIdentification.ProductNameObjectId	The product name of the device.
QModbusDeviceIdentification.ModelNameObjectId	The model name of the device.
QModbusDeviceIdentification.UserApplicationNameObjectId	The user application name of the device.

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

Constant	Description
QModbusDeviceIdentification.ReservedObjectId	First value of reserved object Ids.

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

Constant	Description
QModbusDeviceIdentification.ProductDependentObjectId	First possible value of product dependent identifiers.
QModbusDeviceIdentification.UndefinedObjectId	Do not use.

class ReadDeviceIdCode

Defines the access type of the read identification request.

Stream access:

Constant	Description
QModbusDeviceIdentification.BasicReadDeviceIdCode	Request to get the basic device identification.
QModbusDeviceIdentification.RegularReadDeviceIdCode	Request to get the regular device identification.
QModbusDeviceIdentification.ExtendedReadDeviceIdCode	Request to get the extended device identification.

Individual access:

Constant	Description
QModbusDeviceIdentification.IndividualReadDeviceIdCode	Request to get one specific identification object.

class ConformityLevel

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

Constant	Description
QModbusDeviceIdentification.BasicConformityLevel	Basic identification (stream access).
QModbusDeviceIdentification.RegularConformityLevel	Regular identification (stream access).
QModbusDeviceIdentification.ExtendedConformityLevel	Extended identification (stream access).
QModbusDeviceIdentification.BasicIndividualConformityLevel	Basic identification (stream access and individual access).
QModbusDeviceIdentification.RegularIndividualConformityLevel	Regular identification (stream access and individual access).
QModbusDeviceIdentification.ExtendedIndividualConformityLevel	Extended identification (stream access and individual access).

See also

ReadDeviceIdCode

__init__()

Constructs an invalid QModbusDeviceIdentification object.

conformityLevel()

Return type:

ConformityLevel

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

See also

setConformityLevel()

contains(objectId)

Parameters:

objectId – int

Return type:

bool

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

See also

ObjectId

static fromByteArray(ba)

Parameters:

ba – QByteArray

Return type:

QModbusDeviceIdentification

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()

insert(objectId, data)

Parameters:

• objectId – int

• data – QByteArray

Return type:

bool

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 UndefinedObjectId .

See also

ObjectId

isValid()

Return type:

bool

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.

objectIds()

Return type:

.list of int

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

See also

ObjectId

remove(objectId)

Parameters:

objectId – int

Removes the item for the given objectId.

See also

ObjectId

setConformityLevel(level)

Parameters:

level – ConformityLevel

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

See also

conformityLevel()

value(objectId)

Parameters:

objectId – int

Return type:

QByteArray

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