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]AutoIdOperationStatusEnumerationStatus
);
|
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’. |
|
CodeType |
Defines 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. |
|
Offset |
Start address of the memory area [byte counting] |
|
Length |
Length of the memory area [byte counting] |
|
Password |
Password for read operation (if required) |
|
ResultData |
Returns 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_MethodInvalid |
The device does not support this function |
|
Bad_InvalidState |
This command is not available or not allowed e.g. due to special configuration |