Chapter 2
12 Kaba Ilco Lodging Access Control System
locks are time sensitive, meaning that they have an accurate internal clock and that time
is used to determine whether a keycard is valid or not.
2.6.1 Keycard Creation Date and Time Stamp
When a keycard is encoded using the FDU, it’s creation date and time are stamped in it,
as well as an expiry time. The lock uses this information to grant or deny access to the
keycard. Not only must the keycard be for the correct room (address), but also the current
time in the lock must be earlier than the expiry time encoded on the keycard.
Furthermore, a table in the lock's memory records the time stamp of the most recently
encoded keycard that has been inserted in the lock for each access level (e.g. Guest and
Section/Floor/Group/Zone/Area levels for a standard guest room). The keycard is only
considered valid by the lock if it was made at the same time as the value recorded in the
table, or if it is more recent.
NOTE: When a more recent keycard is inserted, its date and time stamp replaces
the previous information, automatically invalidating any keycard for the
same access level that was created earlier (except if the keycard is a
duplicate, see Section 4.5 – New Versus Duplicate Keycards for details).
In this way, the locking system ensures that, once a new guest or staff keycard is inserted
in a lock, all previous keycards for the same level are cancelled automatically (and no
longer have access). A Reset keycard can be used to update the time stamp without
giving access to the room, providing another way to instantly cancel all previous
keycards.
Figure 2.6.1: Cancellation of the previous Guest keycard by a new Guest keycard
Similarly, the FDU stores a table of the most recent Authorization keycards that have
been used in the FDU. To cancel an Authorization keycard, all that is needed is to make a
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