This OPC UA ObjectType represents an OCR reader device. It defines additional methods and properties required for managing OCR readers or to get additional information on the OCR scan events.

Figure 7 shows an overview for the OcrReaderDeviceType with its Object, Methods, Properties and related ObjectType. It is formally defined in Table 9.

Figure 7 – OcrReaderDeviceType overview

The OcrReaderDeviceType is formally defined in Table 9.

Table 9 – OcrReaderDeviceTypeDefinition

Attribute	Value
BrowseName	OcrReaderDeviceType
IsAbstract	False
References	Node Class	BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of AutoIdDeviceType defined in 6.1.
HasComponent	Object	Images		FolderType	Optional
HasComponent	Method	Scan			Optional
GeneratesEvent	ObjectType	OcrScanEventType	Defined in 7.3.

The OcrReaderDeviceType ObjectType is a concrete type and can be used directly.

Table 10 – OcrReaderDeviceType Additional Subcomponents

Source Path	References	NodeClass	BrowseName	DataType TypeDefinition	Others
RuntimeParameters	HasComponent	Variable	TemplateName	String BaseDataVariableType	O
RuntimeParameters	HasComponent	Variable	MatchCode	String BaseDataVariableType	O
Images	Organizes	Object	<ImageName>	0:FileType	OP

This FunctionalGroup is inherited from the AutoIdDeviceType and described in 6.1. Predefined runtime parameters for for this FunctionalGroup are defined in Table 10 and described below.

Parameter TemplateName is the activate template which defines a specific identification task. The templates have to be defined during configuration.

Parameter MatchCode defines the target value for 2D and OCR decoding.

For quality and testing purposes, the actual image taken by the OCR reader can be accessed with this object. E.g. the picture might be checked by engineers if the OCR decoding does not deliver the expected results.

The Images Object when available shall contain the list of FileType Objects (see Table 10) with the images taken by the OCR reader.

The MIME type of an image is provided through the MimeType Property of the FileType.

This method starts the scan process of the OCR reader device syncronous and returns the scan results. It overwrites the Scan method of the AutoIdDeviceType defined in 6.1.3.4.

Signature

Scan (

[in]ScanSettings Settings

[out]OcrScanResult [] Results

[out]AutoIdOperationStatusEnumerationStatus

);

Argument	Description
Settings	Configuration settings for the scan execution. The ScanSettings DataType is defined in 9.3.7.
Results	Results of the scan execution. The OcrScanResult DataType is defined in 9.3.9.
Status	Returns the status of the scan operation. The AutoIdOperationStatusEnumeration DataType is defined in 9.2.1.

Method Result Codes

ResultCode	Description
Bad_InvalidState	There is already a scan active
Bad_InvalidArgument	The scan setting contained an invalid value like infinite duration.
	Other OPC UA status codes defined for the Call Service in OPC 10000-4.