Northrop Grumman Sperry Marine VisionMaster FT, User Manual

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Radar Radar/Chart Radar User Guide
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Radar Alerts
The following series of radar alerts may be raised by the system.
Video Alerts
Low Video Level
The signal level of the video received from the transceiver is monitored at
regular intervals when the display is in transmit. If the level falls below an
optimal video level a low video alert is raised. The alert is cleared when:

the monitored video level is greater than or equal to an optimum
video level; or

the radar is in standby.
Video Failed
A Video Failed alert is raised under the following conditions:

If there is a detectable fault with the scan converter card such that
it prevents the radar picture from being updated.

If there is a detectable fault with the presentation of the radar video
on the screen. (e.g. Texture Loss)
Video Failed is displayed in red in the video circle when this alert is active.
Communications Alerts
Transceiver Communications
A TX comms alert is raised if a valid message has not been received from
the transceiver for more than 4 seconds. The alert is raised regardless of
the display’s standby/transmit status.
PCIO Communications with Processor
A PCIO USB comms alert is raised within 30 seconds if the physical
connection between the PCIO unit and Processor is broken.
PCIO Communications with SC board
An SC PCIO comms alert is raised within 10 seconds if the connection
between the board and the PCIO unit is broken.
Interswitch Communications
An Interswitch comms alert is raised if the Interswitch is no longer
communicating with the Processor.