Philips VidQuad Color Video Processors TC8275 - Manual (Page 10)

5.2.10 MON-B Monitor Display
The secondary monitor output, designated as the MON-B
monitor, is used for selecting analog full-screen displays of
any one of the eight camera inputs, or to display a
sequenced list of full-screen displays. The MON-B monitor
output is analog and so digital functions such as quad
compression, zoom and freeze are not available on the
MON-B monitor.
The operator can either select full-screen displays of any
camera to the MON-B monitor, or the displays can be
selected automatically to the MON-B monitor screen as a
result of an external alarm input. Full-screen camera views
can be sequenced on the MON-B monitor. The MON-B
monitor can also display the same images that are being
displayed at any one time on the MON-A monitor.
The MON-B monitor sequence list can include any of the
input cameras, as well as the quad images selected for the
quad display monitor. The MON-B sequence list can accept
up to sixteen entries and can include any input several times
and in random sequence.
The sequence dwell times for the MON-A and MON-B
monitors can be set separately by the operator via the
menus.
5.2.11 MON-B Button
Used to toggle the front panel control from MON-A
control to MON B control and visa versa.
Fixed full-screen displays can be selected on the MON-B
monitor by pressing MON-B followed by the appropriate
arrow button. Each arrow button is mapped to a quadrant
on the screen, and will alternately select the two cameras
associated with that quadrant.
The MON-B monitor output is analog. Digital functions
such as zoom and freeze have no effect on the MON-B
monitor output. A flashing "MON-B" indication on the
monitors advises the user that the front panel is controlling
the MON-B monitor.
5.2.12 ARROW Buttons (MON-B)
Used to select a camera for display on the MON-B monitor,
provided that the MON-B button is pressed before the
arrow button.
Each arrow button is mapped to a quadrant on the screen,
and will alternately select the two cameras associated with
that quadrant.
5.2.13 SEQ Button (MON-B)
Sequencing on the MON-B monitor output may be toggled
on and off by using the SEQ button.
To start sequencing while in the MON-B mode, press the
SEQ key. Sequencing will commence at the MON-B
sequence dwell time.
The MON-B monitor dwell time is programmable between
1 and 99 seconds.
The MON-B sequence list can contain up to 16 entries
which are operator programmable via the menu. The
sequence list can include any camera or the MON-A display
in the list several times, and in random order.
To start/stop sequencing on the MON-B output, select
MON-B followed by SEQ.
5.3 Alarm Input Operation
The product is equipped with 4 alarm inputs (TC8277
Series) or 8 alarm inputs (TC8278 Series), each associated
with its corresponding video input. System action during an
active alarm includes on-screen indication of the camera in
alarm (ALM), a front panel LED indicator, an alarm output
relay and the MON-B monitor switching to the camera in
alarm. If multiple cameras are in alarm, the MON-B
monitor automatically sequences between the cameras in
alarm at a preset dwell rate of 1 second.
The alarm inputs are configured as zero potential relay
contacts, individually programmable via the menu to be
normally open (NO) or normally closed (NC). Refer to the
setup MENU to select the input configuration as NO or
NC. Any alarm inputs can be enabled or disabled via the
setup MENU.
Alarms may be cancelled (acknowledged) via a contact to
ground on a rear panel input, or by pressing the SELECT
button.
5.3.1 Alarm Input Handling
There are three ways of handling alarms, which may be
selected by the operator in the setup MENU.
5.3.2 Latched Alarms
Alarms are latched as they become active. An alarm is
cleared when the operator acknowledges it. There is no
time out period.
Note: When the operator acknowledges (cancels) the
alarm, it will be cleared whether the alarm input is still
active or not.
Alarms that have been acknowledged by the operator will
not be reactivated until the alarm input has ceased and then
restarts.
5.3.3 Timed-out (Captured) Alarms
Timed-out alarms are latched for a minimum time out
period from the start of the alarm becoming active. The
time out period is menu programmable. After expiration of
the time out period, the alarm is automatically cleared.
Alarm inputs that are still active after the time out, become
manual type alarms. Alarms that cease and restart before
the time out is complete, will restart the time out period.
Timed out alarms can be cleared by the operator before
they time out. Alarms that are cleared before their inputs
have ceased, will not be reactivated until the alarm input
ceases and restarts.
5.3.4 Manual Alarms (No Capture)
Alarms are active only while the alarm input is active. As
soon as the alarm input ceases, the alarm is cleared.
5.3.5 Clearing Alarms
Alarms are cleared by pressing SELECT/ALARM CLR, or by
pulling a rear panel contact (pin 4) to ground. Refer to the
rear panel drawing for the location of the contact.
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