Rev. B
7-5
HMXMC001013
31-Mar-06
7.1
VIDEO INPUTS, CONTINUED
7.1.4 Camera
Fail
Detection
Camera(6)
is defined as a fixed camera with video fail detection enabled. Its video
signal is physically connected to video input 26 of subrack 11. This would be on the
second stage of cascading as subrack 10 is to be bypassed. A camera fail detection
module is assigned to this video input in slot 32 (FSL). If the camera signal is
completely lost, or a completely black image is returned (for a prolonged period, say 5
seconds), then the system will generate an INTERNAL alarm (of alarm display group 1)
and display this flashing alarm message onto an appropriate monitor.
The START MACRO will also be executed and in these examples, the macro sequence
will disable the failed camera, preventing it from being selected. When the camera is
restored to normal operation the FINISH MACRO will execute automatically re-enabling
the camera again.
In the example this camera has been LINKed into the network (in the NET-SOURCE
field). This means that it is also available to another video system node for selection.
Camera failed status would also be broadcast into the network so other video system
nodes can also display the detected camera fail alarm condition.
7.1.5
Camera with Pre-text
Usually camera identification text is inserted in to the video picture at the output of the
video matrix just prior to being displayed on a monitor (called post-text). In some
applications, such as in 24 hour dedicated recording, it is necessary to split the
incoming camera signal. One path is the normal connection to the input side of the
video matrix. The other is via a dedicated PRE-TEXT insertion module which then
connects directly to a dedicated video recorder. This adds camera identification and
time/date into the video picture for recording.
In our example
Camera(7)
allocated a pre-text module in slot 7 of subrack 9. The text
window X/Y position on screen is set to 2,10.
NOTE:
The display status (white plus shadow, double-
height, etc.) is defined in the special parameters table
accessible from the main menu of SETMAX.
Содержание MAXPRO-Net
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