Meinberg FUNKUHREN DU35K, Operating Instructions Manual

Page: 7 / 20

7
DU35K as Stand Alone Clock
After connecting the power supply to the 230V/50Hz net the appearing time/date can
be set by the two buttons in the rear panel of the case. The accuracy of the time
depends on the precision of the internal quartz base.
An automatic changeover of daylight saving can be programmed as described in
section "Daylight Saving".
DU35K as Slave Clock
There are two possibilities of synchronisation. The DU35K can be synchronized either
by serial time strings or by pulses per minute. The selection can be set by jumper JP19
on the board (see section "Jumper Arrangement").
Synchronisation by serial Time Strings:
A preconnected radio clock sends the time strings to the DU35K. When the radio
clock stops sending time strings the DU35K continues by running on XTAL.
The data transmission occurs either:
- via RS232 or
- via 20mA current loop.
It is possible to connect several DU35Ks or other Displays via serial interface to
one radio clock.
Synchronisation by Pulses per Minute:
The DU35K can also operate as a normal slave clock. A preconnected master clock
generates the minute slave line with pulse levels up to 48V. Installing the system it is
necessary that the DU35Ks time match about ±15 sec. with the master clocks time.
Synchronisation with the master clock is indicated by a dot between date and time on
the display: When the dot is visible the DU35K runs free, when the dot dissappears the
clock is syncronized. Synchronisation is possible only two times per hour. An automa-
tic changeover of daylight saving can be programmed as described in section "Auto-
matic Changeover of Daylight Saving".