The duty cycle is a legally regulated limit of the transmission 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.
During normal operation, the duty cycle is not usually reached. However, repeated and wireless-intensive teach-in processes mean that it can be in isolated instances during start-up or initial installation of a system. This can happen for example when setting and testing the detection range of taught-in motion sensors. If the duty cycle limit is exceeded, the device may stop working for a brief period.
This is due to the fact that permanent transmission is not permitted in the 868 MHz range (maximum transmission time: 36 seconds per hour). Therefore, when this limit is reached, further transmission by the devices must be prevented. Perform a short function check on the device (e.g. by removing and reinserting the batteries). If the check does not restore the device to readiness for operation, it has exceeded the duty cycle and will be ready for operation again in an hour's time.