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IOTA-VTI Operation Manual
Video Screen Types:-
The unit displays a splash screen for a few seconds at startup and is followed by either a
Position screen or Time screen, depending on the setting of the Position/Time switch.
Splash Screen. This gives general credits, the software version (top line), hardware version
(near the bottom of the screen), and an indication of the condition of the backup battery will
be indicated during the interval the splash screen is displayed.
Position Screen. This gives information about the GPS status, the current date and time (to
three second resolution), geographic location, and VTI system information. Latitude and
longitude are given in degrees, minutes, and decimal minutes. The date the IOTA-VTI was
last used is displayed.
Time screen. This single line display gives GPS fix information, UTC (HH-MM-SS), the
number of 100 microsecond intervals since the most recent 1PPS signal, and the number of
video fields counted since power was applied or the Reset switch was pressed.
The Splash Screen – In Detail:-
The Splash screen (as shown above) displays useful information during the startup phase;
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The version of the firmware installed in the device.
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The Author and Quality Assurance origin.
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The Manufacturer.
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The version of the board installed.
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A message that reports on the condition of the Backup Battery since the device was
last used.
The user should note the type of message displayed. There are three conditions:-
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Battery OK - is the normal startup condition. All is well.
-
Battery fail - means the battery has failed or the battery was tampered with during the
shut down interval. This will be displayed the first time a new device is used,
because a new device is shipped with a battery insulation tag in place, which of
course is removed after unpacking.
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GPS fail - indicates the firmware failed to communicate with the GPS for some
reason. A Reset or Power on/off/on cycle should restore normal operations.
For more information see the Battery Backup section.
- 3 -
Video Timers
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