V02.00 | 2021/02
41
7.5
Addressing password protected areas of a tag
The following table shows the possible access options to the tag when password protection is
set.
Action
Response of the tag
Remark
Access to read protected area
without password or with
incorrect password
Tag responds with
0
The response of the tag with
0
can have two causes:
Either the memory area of the tag is written with 0
or is read protected.
Recommendation: in order to distinguish between a
correct and an incorrect read operation, set a bit
other than 0 in every page.
Access to write protected area
without password or with
incorrect password
Error message: E1FE0200
Error message E1FE0200 can have two causes: Either
an incorrect password was sent or the tag was too
short in the detection range.
Remedy: Execute the
Get Tag Protection Status
command.
Inventory (scan UID)
Tag sends UID
The UID can always be read irrespective of password
protection.
Access (read or write) with a
password (in the read/write
head) to an area not protected
with a password
Access is carried out, and the
DONE
bit is set.
Access (read) with an incorrect
password or without a pass-
word to a protected and
unprotected area
The data from the
unprotected area is displayed.
The protected area is
displayed as
0
.
Access (write) to a protected
and an unprotected area
Error message E1FE0200, data
not written.
The protected area on the tag is in front of the
unprotected area.
The unprotected area is writ-
ten, followed by error mes-
sage E1FE0200.
The unprotected area on the tag is in front of the
protected area.
Tag present at read/write
head
The
TP
bit (Tag present) is set irrespective of pass-
word protection.
