6.5.3.7 Method ReadTag

This method reads a specified area from a tag memory.

One Method invocation reads one AutoID Identifier. The Call Service used to invoke the Method can take a list of Methods. Therefore a list of AutoID Identifiers can be read by passing in a list of Methods to the Call Service.

See Annex B for technology specific mappings.

Signature

	ReadTag (
		[in]	ScanData					Identifier
		[in]	CodeTypeDataType				CodeType
		[in]	UInt16					Region
		[in]	UInt32					Offset
		[in]	UInt32					Length
		[in]	ByteString					Password
		[out]	ByteString					ResultData
		[out]	AutoIdOperationStatusEnumeration	Status
		);
Argument Description
Identifier

AutoID Identifier according to the device configuration as returned as part of a ScanResult in a scan event or scan method. The ScanData DataType is defined in 9.4.2.

If the ScanData is used as returned in the ScanResult, the structure may contain information that must be ignored by the AutoID Device. An example is the ScanDataEpc where only the parameter UId is relevant for this Method.

If the Identifier is provided from a different source than the ScanResult, a ScanData with a ByteString can be used to pass a UId where the CodeType is set to ‘UId’.

CodeTypeDefines the format of the ScanData in the Identifier as string. The String DataType CodeTypeDataType and the predefined format strings are defined in 9.1.3.
Region

Region of the memory area to be accessed. If there is no bank available this value is set to 0. This is the bank for UHF (ISO/IEC 18000-63) or the bank (ISO/IEC 18000-3 Mode 3) or data bank (ISO/IEC 18000-3 Mode 1) for HF or memory area (ISO/IEC 18000-2) for LF.

See Annex B for technology specific mappings.

OffsetStart address of the memory area [byte counting]
LengthLength of the memory area [byte counting]
PasswordPassword for read operation (if required)
ResultDataReturns the requested tag data
Status

Returns the status of the read operation.

The AutoIdOperationStatusEnumeration DataType is defined in 9.2.1.

Method Result Codes

ResultCode Description
Bad_MethodInvalidThe device does not support this function
Bad_InvalidStateThis command is not available or not allowed e.g. due to special configuration