Meinberg PZF510 - Manual (Page 15)

15
Time marks start at the beginning of new second. If a binary "0" is to be transmitted, the
length of the corresponding time mark is 100 msec, if a binary "1" is transmitted, the time
mark has a length of 200 msec. The information on the current date and time as well as
some parity and status bits can be decoded from the time marks of the 15th up to the 58th
second every minute. The absence of any time mark at the 59th second of a minute
signals that a new minute will begin with the next time mark. The DCF emulation output
is enabled immediately after power-up.
Realtime clock
The PZF510 includes a battery-backed realtime clock which runs crystal-precise in case
of power failure. A relativ accurate time is present immediately after power-up this way.
An additional RAM of the realtime clock is used to store important system parameters.
TIME_SYN output
This output is set to TTL-high if the receiver is in synchronous state (LED 'Freil'
switched off). The output level changes to TTL-low if the receiver is in asynchronous
state for more than one hour. The TIME_SYN output is available at the VG-connector
and can be used to release an alarm, for example.
Expansion capabilities
The signals '/RESET in/out', 'SCL out', 'SDA in/out' and 'SCL_EN' at the VG-
connector are reserved for future expansions. Like the 'reserved' pins, they should not
be connected to any signal by the user.