Functional description and allocation of terminal pins Manual BG41/BG42/BG43
3-80 Rev. 99/49
3.2.10.9 Start-up response
After being switched on or reset, both LEDs light up on the antenna module after a short transient
period. By correct alignment the green LED starts to blink a pulse a second. After approximately
one minute, the red light also starts to blink and hereby indicates the synchronisation phase.
Error-free recieved time telegrams are always transmitted through the 20mA interface. The
plausibility check of the date and time is carried out in the antenna module.
If an error-free time signal has been received and transmitted to the interface building block, both
LEDs go out. The antenna module goes into a current economy mode through the sleep mode.
From now on the clock chip on the interface building block is synchronised every full hour with the
actual time.
The absolute difference in propogation time between the DCF77 time and the internal time is at
least 60 ms at the point of synchronisation with optimal reception conditions. This difference is
larger by poorer reception conditions.
3.2.10.10 Resetting of the antenna module
Antenna modules are reset by removing the 20 mA plug. In the current economy mode the modules
can not be directly reset. The voltage is held by a capacitor. A reset procedure can only be activated
after the completion of the discharge time (aprrox. 1 minute). The following procedure is to be
observed:
•= Remove the antenna module’s 20mA plug from the interface building block.
•= Keep to the 1 minute waiting period.
•= Reconnect the antenna module’s 20mA plug.
3.2.10.11 Description of the light emitting diodes
Two light emitting diodes are to be found directly on the antenna module, which provide the
following information necessary for installation:
LED 1 (green): Indicates the modulation on the DCF77 carrier signal
(by good reception blinks a pulse a second)
LED 2 (red): ON After switching on or resetting the building block
BLINKS Building block finds itself in the synchronisation phase
OFF The time telegram was received in its entirety and error-free
and the time was transmitted once to the connected building block.
Piece of advice:
The module does not possess a field strength indicator. The quality of the reception can be
determined by the blinking rhythm of the green LED.
Flickering means a bad reception; the antenna must be aligned better.
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