Note: You will need to repeat this procedure each time VersaSync is
power-cycled (with no other references available), unless you enabled the
feature Synchronize to Battery Backed Time on Startup.
Example 5—Time at power-up ("Local System Time") to be considered
"Valid". GNSS input to serve as 1PPS reference
The objective of this use case is to allow VersaSync to use itself as a valid reference. This is
referred to as “Local System” time.
In order for this to happen, VersaSync requires an external Time, or 1PPS reference. In
other words, "Local System" cannot be both Time, and 1PPS. This makes "Local System" a
legitimate, traceable reference.
Therefore the "Local System" does not have to be manually set ("validated") by the User
after VersaSync was power cycled (as would be the case with a “User/User” reference).
Since “Local System” cannot be both Time, and 1PPS input together, in this example the
GNSS input will be set as the 1PPS reference (other use cases may require using different
references, e.g. IRIG.)
As there is no default entry for “Local System” and “GPS”, a new entry needs to be added
to the Reference Priorities table in order to use this combination of references.
Step-by-step procedure:
1.
Add a reference to the Reference Priority by clicking the PLUS icon. Use the fol-
lowing settings, then click Submit:
In the Priority Level text box, enter 1. This will give this reference the highest
priority.
In the Time field, select “Local System”.
In the PPS field, select “GPS”.
Check the Enabled checkbox.
2.
Confirm that the first reference in the Reference Priority table has “Local System”
as the Time input and "GNSS" as the 1PPS input.
3.
After a power cycle or reboot, as soon as GNSS is declared valid, the System Time
will automatically be used as-is, with no manual intervention required.
3.3 Managing References
CHAPTER 3 • VersaSync User Manual Rev. 7.0
163
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