Protection codes
and Comparison
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_ProtCodes Comparison
TAG not logged in
Its equivalent in HEX
A memory word in binary
Write protection
Read protection
Setting the « Mask protected region » bit
Mask protected region
Reading a protected word without login
Result of a reading
Mask protected region
TAG logged in
Write protection
Read protection
Reading a protected word with login
When words are protected using a password,
you may only access them with a login.
When words are protected by “Read protection
Result of a reading
bits” you may only compare them with other
data.
1. Result of reading
transponder addresses
20 through to 24
2. Result of reading the
same addresses after
having protected
addresses 21 and 22
The acknowledgment (error) code "4" after the second
phase indicates that the entered data is not identical to
Thedata
acknowledgment
(error) code "0“, after the second
the
stored in the memory.
phase, indicates that the entered data is identical to the
Complete words have to be compared!
data stored in the memory
Content of the
memory of the
transponder
Protection codes
End
of Comparison
this chapter
and
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_ProtCodes Comparison