Meinberg C28COM - Manual (Page 9)

9
Status LED
The integrated two-color LED displays the synchronization status and the demodula-
ted time marks of the module C28COM. A red LED indicates a free running clock
while a green shining LED shows the user that the clock is already synchronized to
DCF77. A correctly demodulated time mark turns off the respective shining LED for
100 msec or 200 msec.
Technical specifications C28COM
RECEIVER: Narrowband straight receiver with automatic gain control
bandwidth approx. 50 Hz, gain control approx. 90 dB
internal ferrite antenna
MODULATION: demodulated time marks displayed by LED
TIMECODE
CHECK:
multiple software checks of the incoming timecode
parity and consistency check over a period of two minutes
RUNNING
ON CRYSTAL:
RF signal distortions causes the clock running on crystal with an
accuracy of +/- 20 ppm
indicated by LED and status character of serial time string
RELIABILITY
OF OPERATION: a watchdog lets the microprocessor recover from malfunction.
SERIAL
INTERFACE:
one asynchronous serial interface (RS-232)
POWER
REQUIREMENTS: via the RS-232 flow control signals RTS and DTR and the data
signal TxD
load:
RTS, DTR approx. 3mA each
TxD approx. 2.8mA
HOUSING: Unbreakable plastic case, 60 mm x 50 mm x 20 mm
AMBIENT
TEMPERATURE: -20 ... 65°C
HUMIDITY: max. 85 %