Siemens Simatic Ident Function Manual page 39

Programming ATTRIBUTE "0x82"
If the number of transponders in the antenna field is unknown, repeat the "INVENTORY"
block with the ATTRIBUTE = "0x82".
* The number of returned IDs "X" depends on the "ATTRIBUTE" used.
Figure 3-13
Results for RF61xR, RF68xR
The number of "TAG_DATA[x]" elements of the data types of the ATTRIBUTE "0x80" and
"0x81" depends on the number of transponders to be expected. For this reason, you need to
assemble the receive buffer yourself. Not the following structure when creating the receive
buffer "IDENT_DATA"/data type:
● The first element "NUM_MDS" is always of the type "WORD".
● The next element "TAG_DATA" is always of the type "ARRAY". The number of
transponders to be expected ("n") must be entered in the "ARRAY".
The following tables show an example of the structure of the receive buffer
"IDENT_DATA"/data type for the ATTRIBUTE "0x80" and "0x81".
Table 3- 16 ATTRIBUTE "0x80"
Name
NUM MDS
TAG_DATA
TAG_DATA[1]
Reserved
ID_Len
EPC_ID
tagPC
TAG_DATA[2]
...
TAG_DATA[n]
Ident profile and Ident blocks, standard function for Ident systems
Function Manual, 10/2018, C79000-G8976-C387-04
Program sequence of ATTRIBUTE "0x82" with unknown transponder populations
Type Comment
WORD Number of MDS
ARRAY[1..n]of Length of EPC ID
IID IN I 80
IID_IN_I_80
BYTE
BYTE Length of EPC ID
ARRAY[1..62] EPC-ID
of BYTE
WORD
IID_IN_I_80
...
IID_IN_I_80
Setting parameters for blocks
3.4 Programming Ident blocks
39