User's Manual

CAEN RFID API – Reference Manual

Remarks:

Depending on the air protocol setting it will execute the appropriate anticollision algorithm. This version of the method

permits to specify a bitmask for filtering tag's populations as described by the EPC Class1 Gen2 (ISO18000-6C) air

protocol. The filtering will be performend on the memory bank specified by bank parameter, starting at the bit

indicated by the Position index and for a MaskLength length. The method will return only the tags that matches the

given Mask. Passing a zero value for MaskLength it performs as the non-filtering InventoryTag method. The Flags

parameter permits to set InventoryTag method's options.In this case bit 1 and 2 of the flag (continuos and framed

mode) are ignored.

Flag value meaning

Bit 0

RSSI: a 1 value indicates the reader will transmit the RSSI (Return Signal Strength Indicator) in the

response.

Bit 1

Framed data: a 1 value indicates that the tag's data will be transmitted by the reader to the PC as soon

as the tag is detected, a 0 value means that all the tags detected are buffered in the reader and

trasmitted all together at the end of the inventory cycle.

Bit 2

Continuous acquisition: a 1 value indicates that the inventory cycle is repeated by the reader depending

on the SetReadCycle setting value, a 0 value means that only one inventory cycle will be performed. If

the continuous mode is selected a 0 value in the ReadCycle setting will instruct the reader to repeat the

inventory cycle until an InventoryAbort method is invoked, a value X different from 0 means that the

inventory cycle will be performed X times by the reader.

Bit 3

Compact data: a 1 value indicates that only the EPC of the tag will be returned by the reader, a 0 value

indicates that the complete data will be returned. In case that the compact option is enabled all the

other data will be populated by this library with fakes values.

Bit 4

TID reading: a 1 value indicates that also the TID of the tag will be returned by the reader together with

the other informations.

FreeTagsMemory

Description:

The function permits to free the allocated memory by CAENRFID_InventoryTag.

Unlike the C#/Java languages where objects are automatically destroyed by the Runtime Environment, in C language it

is necessary to esplicitly deallocate the memory allocated by the identified tags. To do that, the FreeTagsMemory

function is available, passing the pointer to the identified tags list.

Parameters:

Name

Description