M
ULTI
-S
OURCE
S
YSTEM BASED ON
S
YSTEM
7001RC
Multi-Source Function System 7001RC - V02.01
19 / 31
hopf
Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: info@hopf.com
2.3.3 Delayed Changeover between Primary and Secondary Source
The automatic changeover from the selected primary source to the secondary source
depends on two factors:
•
Validity or availability of the synchronisation signal
•
Expiry of the "Sync. Status Change after Sync. Fail" timer
The timer bridges failures of the primary sync. source and maintains the status of the clock
system on radio status "
R
" for the time set by the user (possible settings: 2 - 255 minutes).
The setting to be made depends on the difference in accuracy between the primary and
secondary sources.
If the primary source is significantly more accurate than the secondary source then the
internal quartz base of the system is also controlled correspondingly more accurately.
In the event that the primary source fails for a few minutes, the system then continues to run
demonstrably more accurately using this control value than if it were to be re-synchronised
via the secondary source. For this reason it is sensible to prevent a premature changeover
by means of the timer, in order to maintain system accuracy.
2.3.4 System Behaviour on Summertime/Wintertime Changeover
Bits 5 and 6 are used to define the changeover times for summertime / 'wintertime via the
"Synchronisation Settings Byte"
.
Bit 6 Bit 5
System Behaviour
0
0
ST/WT changeover is only carried out by the external source. The system
7001RC internal changeover times are ignored.
(GPS always requires the internal ST/WT changeover)
1
0
ST/WT changeover is carried out, dependent on the status of the external
source system, either via the external source
or
via the internal
changeover times:
•
Changeover times are carried out by the external source provided
that this is delivering valid time information
(GPS always requires internal ST/WT changeover)
•
Changeover times are carried out by the system 7001RC internal
changeover times if the external source is not available.
x
1
ST/WT changeover is only carried out via the system 7001RC internal
changeover times. Changeover times transmitted via the sync. sources are
ignored.