The alarm notification feature described below allows you to be notified of a
potential reception issue BEFORE the GNSS reference becomes invalid. This may
be useful e.g., to notify system operators of a deteriorating signal reception
before VersaSync loses the GNSS reference.
Note that VersaSync itself has a pre-defined minimum number of satellites that
must be tracked in order for GNSS to be considered a valid reference. The min-
imum number of satellites depends e.g., on your receiver mode, the GNSS signal
reception in the area where your antenna is located, and the type of receiver in
your unit. In Stationary mode, and for SAASM units, the minimum number of satel-
lites is normally 4 (four). Hence, it would be prudent to set the Minor Alarm
Threshold to 8, and the Major Alarm Threshold to 6.
Note: While GPS Notification Alarms can be used in Mobile GNSS
receiver mode, it is not advisable.
To determine how many satellites your VersaSync unit is currently receiving, nav-
igate to INTERFACES > REFERENCES: GNSS0. See also "Reviewing the GNSS
Reference Status" on page195.
To set the GPS Alarm Thresholds:
1. Navigate to MANAGEMENT > OTHER: Notifications, and choose the GPS
tab.
2. At the bottom of the window, locate the ALARM THRESHOLD panel:
3. In the Minimum Satellites fields enter the minimum number of satellites that
must be available before the alarm is triggered. The alarm will be triggered
when the number of satellites available is BELOW this number.
4. In the Duration Below Threshold (s) fields, enter the time in seconds that
the system must be below the threshold set in the Minimum Satellites field
before an alarm is triggered. The alarm will be triggered when this time is
reached.
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CHAPTER 4 • VersaSync User Manual Rev. 12
4.3 Notifications
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