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⑨
Mask length
sets the mask length (0–255)
⑩
Mask data
sets the data to be filtered
⑪
Get
reads the data of the filter selected at
①
⑫
Set
sets the select filter
Tip
In Generation 3 readers, select filter data are permanently stored in the reader, e.g. if the select filter has
been activated, it is active after a reader restart.
16.8.5 Applying a Select Filter (Example)
You have the following results of the basic reading but you would like only the tags with the
FC28 in the memory
address to take part in the inventory:
Fig. 13:
Basic reading: select filter required
To do so, it is necessary to create a select filter. The advantage of this process is that the filtering takes place already at
the air interface level.
To create the select filter as shown in the figure below:
7
8
9
2
4
5
1
2
3
4
5
6
1.
Select the filter you would like to save the filtering settings to under
Filter (
①
).
2. Select the target (
②
). Make sure the target matches the session set in
⑲
Fig. 67
3. Select an action (
③
). In the example, the action is set to
100; see also
EPCglobal Gen 2 Specification
.
4. Select the
EPC
memory bank (
④
).
5.
Activate the select filter (
⑤
).
6. Refer to the
EPCglobal Gen 2 Specification to check from which bit pointer the filter will search for the value
according to which you would like to filter the tags (
FC28 in the example); see pp. 44–46 in the EPCglobal Gen 2
Specification V 2.0.
1. In the example,
FC28
is the third word in the EPC memory bank (bit pointer 0x00 is the CRC,
bit pointer 0x10 is the PC, bit pointer 0x20 is the first EPC word). Therefore,
FC28 corresponds to the bit pointer
0x40.
7. Enter
40 at Bit pointer (
⑥
).
8. Enter the mask length at
⑦
. In the example,
FC28 is one word, therefore, the value is 16.
9. Enter the value (
FC28) at
⑧
.
10. Click
Set (
⑨)
.
11. Go to
Expert settings 1.
12. In Selection Parameters, set the value at target to
B; see also
EPCglobal Gen 2 Specification
.
13. Start the reading in the
Basic reading tab:
