Conrad Electronic FS20 PIRI-2 Operating Instructions Manual page 16

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At east one channel must be active in order to control the function and detection
area of the 'FS20 PIRI-2' with the internal LED display.
This means that at least one channel of the DIP switch must be active and not
set to 'Switch on at twilight' (DIP switch 2 or 4, setting described in section 13
b), if the brightness currently in the environment is higher than the programmed
brightness threshold.
Aside from this, the programmed transmission interval (factory setting: 24
seconds) of the respective channel must be observed, as this reduces re-
peated triggering with too short intervals.
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