Avery Dennison RFID - Manual (Page 18)

HowToRFID
Revision: 13 Date: 31 August 2009
Page 18 of 53
For UHF technology the step “selecting the tag” is skipped (not necessary). The RFID processing starts
immediately with the requested write or read operations. If one of the operations fails (is not successful) the label
gets invalidated in the same way is described for HF technology.
2.4.8 Processing failures (errors) – Bad tag signaling
As mentioned before if the RFID processing fails the label is invalidate. For automated processes this is not
sufficient because it must be made sure in not-encoded label is not released (forwarded) into a further process. As
a prerequisite for this requirement a print and apply system must signal RFID processing errors via a control
interface.
A mechanical unit for removal of invalid labels (also called bad tags) can be triggered by that signal and remove the
invalid label from the processing line.
BTS on the Applicator Interface
For the print and apply system ALX 924 / ALX 926 the bad tag signal is available on the applicator interface as
output signal “BTS”. For details see [AI-Manual].
An optional Bad Tag Separator can be attached to the ALX to remove the invalid labels by sticking them on a
waste roll.
Alternative solutions
Please note: the BTS is not available on the USI.
2.4.9 Statistics
There is information about RFID operations in a printable status. It tells you for example how many operations of
each type have been processed and how many of them have failed (compare).
RFID Status
System version V5.33
Aug 01 2008
Printer type Avery 64-05
Nr. Cmd retries 3
Nr invalid tags 3
Statistics
Nr of tags 707
Nr invalid tags 72
Scrap rate 10.2 %
Total Nr SELECT 755
Invalid SELECT 17 %
Total Nr Read 730
Invalid Read 730
Total Nr WRITES 507
Invalid WRITE 29 %
…
Figure 4: example of printable RFID information