IDAC
Technical Support:
6
1.3
START-UP AND BUS KNX POWER FAILURE OR OPEN DOOR
After the device start-up (due to a device reset or programming), it requests date and
time through the object
“[Access] Request Date and Time”
. The group address of
this object is the one that must be indicated in Z-Access to respond to the request.
For proper operation of the buttons of both modules, it is recommended not to be
pressing them during the initialization, either after programming or after connecting the
external power supply.
On the other hand, in the event of a
KNX bus power failure or door opening
the
device will
continue operating normally
since it has power supply
through a
rechargeable battery, although, of course, there will be no communication with the KNX
bus. Nevertheless, note that, to reduce the battery consumption:
All LED are turn off after 5 minutes of the KNX bus power failure or door
opening. They are only turn on after a presence detection, press or card
reading.
The BLE module and NFC reader on the external module are turned off when
the door opens. In the event of KNX bus power failure with the door closed
they will remain active, enabling access to the room.
Important
:
If the battery is drained out, it is essential that, when the device is restarted
during the charging process, the time is correctly received as a response to the object
request "[Access] Request Date and Time". A clock offset caused by the absence of
a battery can be critical for user access, as it depends on the date/time specified on
their cards
.
