Meinberg HSC509 - Manual (Page 22)

22
Slave Clock Operation
The HSC509 generates slave clock pulses that are able to control slave clocks. These
bipolar pulses have a level of 24V.
In case of power supply failure the time is saved in a buffered memory. After restart
of the system the lost pulses are generated automatically so that the slave clocks will
be set correctly. The extra minute pulses are added every two seconds. The pulse
duration of the minute pulses is 1s, the duration of the second pulses is 0.5s.
The master clock has no feedback from the slave clocks to find out what time they
show. So if the system is turned on for the first time or slave clocks are added, the
slave clocks must be initially set to a well defined state. This can be done in the menu
‘Nebenuhr setzen’.
Pic. 3.5 Pic. 3.6
Pic. 3.5: The menu ‘SETUP Nebenuhr’ lets the user enter the submenu ‘Nebenuh-
renzeit’ by pressing CLR/ACK.
Pic. 3.6: In this submenu the user can choose eiter to see the slave line time
displayed (>>anzeigen) or to set the slave line time/the slave clocks (>>setzen). The
choice is done by pressing NEXT and confirm with the CLR/ACK key.
Display Slave Line Time
The actual slave line time is displayed. There are three modes:
1.) normal mode: slave line time is synchronous with the clock's time
2.) hold mode line time > clock time; line time waits for clock time
3.) follow mode line time < clock time; line time catches up clock time