Meinberg DCF77 UA509 - Manual (Page 14)

14
Technical Specifications
RECEIVER: Direct conversion quadrature receiver with automatic gain
control
Bandwidth: approx. 20Hz
DISPLAY: eight digit 7-segment display, 2.5mm character height
shows either time or date, selectable by front-panel switch
LEDs for modulation, field strenght and free running
TIMECODE
CHECK:
multiple software check of the incoming timecode
parity and consistency check over a period of two minutes
RUNNING
ON XTAL:
RF distortions indicated by "Freil."-LED and a status character
in the serial output string
without RF signal the clock runs on XTAL with an accuracy
of 10
-6 (after 24 hours of synchronous operation)
BUFFERING: In case of supply voltage failure the on-board RTC keeps the
time based on XTAL for more than 150 hours (buffer capacitor)
optional lithium backup battery (life time: 10 years)
RELIABILITY
OF OPERATION: A software watchdog lets the microprocessor recover from
malfunction. A power-fail comparator resets the microproces-
sor if the supply voltage drops below a specified threshold.
MANUAL
TIME SETTING:
Two optional push buttons provide manual setting of time and
date.
PULSE OUTPUTS: active high and active low TTL output lines provide pulses per
second and per minute with 200ms of lenght
INTERFACES: 2 independent interfaces (COM0 and COM1)
baudrate, framing, output mode and time zone are configurable
for each interface
COM0: 2 active and 2 passive 20mA current loop outputs
1 active/passive 20mA current loop input
1 RS232 output, 1 RS232 input
RTS and CTS handshake signals
COM1: 1 active and 1 passive 20mA current loop outputs
1 active/passive 20mA current loop input
1 RS232 output, 1 RS232 input
RTS and CTS handshake signals