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Atomic DCF77 Clock
3
3. 24V Slave clock 1 second minute pulse
4. Extra RS232 for future use
The Central Unit is powered by the mains supply (230V). When the mains is connected and the
device is switched on, the 'Signal' LED indicates that the clock receives the DCF signal. This LED
flashes every second.
The Central Unit analyses the information received from the DCF transmitter and shows the received
time and date alternately on the display.
The time received and all the settings sent from the computer to the Central Unit are stored in the
RTC clock, which is battery-backed up. This guarantees that the Central Unit functions properly
even when there is a power failure.
If the Central Unit has a valid time and date, they can be transmitted automatically to the computer.
User-requested transmission of the time is always possible.
If the display blinks, it means that the Central Unit time and date are not valid anymore; in this case
the buzzer beeps every minute and the automatic transmission to the computer/server is stopped.
DCF Receiver:
DCF Receiver is build in a small case with a fixed cable. In the lower part of the case there is a
LED indicating received DCF signal. The LED is synchronous with the "Signal" LED of the Central
unit front. The can be used to point the antenna in the correct direction.
Frankfurt
This receiver can be fixed to an outside wall if necessary. The unit should be placed on a wall facing
Frankfurt, Germany. The direction of the antenna can be adjusted manually.
RS232 cable:
The RS232 cable connects the Central Unit with the RS232 computer interface. RS232 cable has a
DB9 female connector at the computer end, and a DB9 male connector at the Central Unit end.
7


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