HumanTechnik Signolux Guardion Interlink Mode D'emploi page 53

tector's internal timer causes this signal to show only during daytime.
In this case, it is obligatory to replace the smoke detector.
EN
Activity indicator
A very faint and brief flashing of the activity indicator shows that the
module is functioning correctly. This indicator is only visible when the
base is removed.
Channel selectors
The channel selection switches of the module are set to channel 0 by
default. Normally this setting does not need not be changed.
However, if separate smoke detector groups are to be operated within
the same building, the smoke detectors can be set to different radio
channels.
To do this, remove the base of the wireless smoke detector, unscrew
and remove the module cover (image on page 30) and set both channel
selection switches to the desired channel number. All devices within
a smoke detector group must be set to the same channel in the same
way. Changing this setting has no effect on the signolux receiver units.
53