Meinberg RU226 - Manual (Page 3)

FUNKUHREN
RU226
DCF77-receiver
Output signal
For evaluating of the DCF-time-telegramm, the module delivers the demodulated time marks.
The following values for the output signal are possible:
Positive pulses:
High-level
: typ.: power supply - 1 V
Low-level : typ.: 0,1 V
Negative pulses:
High-level
: typ.: power supply
Low-level : typ.: 0,1 V
With a +5V power supply, the output pulses are delivered with TTL-Level.
Pulse duration
The pulse duration of the output signal of RU226 depends on the conditions of receiption. The
resulting tolerances of the demodulated time marks have to be taken into consideration when
evaluating the DCF-telegramm. The following durations are possible:
DCF binary '0': 60ms < t < 130ms
DCF binary '1': 150ms < t < 220ms
Power saving mode
By connecting an appropriate signal to the control pin "POFF", the module can be switched on or
off. The current consumption is reduced to about 1mA (with 5V power supply) in the power
saving mode. If this function is not used, the pin "POFF" may stay unconnected. The following
signals will cause the described mode:
POFF = GND or unconnected : module aktive
POFF = VDD
: module inaktive (power down mode)
Connections
The module is delivered with a four-wire cable of 1m length (others on request). The following
colours are corresponding to the described signals:
black : GND (reference potential)
red : VDD (power supply)
orange : DCF-MARK (demodulated time marks)
brown : POFF (power down input)