35
Troubleshooting
8.3
Activation of alarm mode not possible
When activating the alarm mode of your Homematic IP
security components, you will be informed about the de-
vice LED if activation was not possible due to a missing
Internet connection or unsafe status of a sensor (see „8.5
Error codes and flashing sequences“ on page 36). The
following unsafe conditions can occur:
• Window open
• Battery empty
• Sabotage contact triggered
• Configuration data ready for transmission
• Duty cycle limit reached
8.4
Duty cycle
The duty cycle is a legally regulated limit of the transmis-
sion time of devices in the 868 MHz range. The aim of
this regulation is to safeguard the operation of all devices
working in the 868 MHz range.
In the 868 MHz frequency range we use, the maximum
transmission time of any device is 1% of an hour (i.e. 36
seconds in an hour). Devices must cease transmission
when they reach the 1% limit until this time restriction
comes to an end. Homematic IP devices are designed
and produced with 100% conformity to this regulation.
During normal operation, the duty cycle is not usually
reached. However, repeated and radio-intensive teach-
in processes mean that it may be reached in isolated in-
stances during start-up or initial installation of a system. If
