Bosch LTC 8900 Series, User Manual

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EN
| 11
Bosch Security Systems | March 17, 2009
LTC 8900 | User Manual | Keyboard Operation
DITHER is a legacy Allegiant receiver/driver feature
designed to extend the life of tube-based low-light level
cameras. Its function was to prevent bright lights in the
scene from burning a spot on the camera imager. When
this feature is active, and the pan/tilt is not moved for a
period of about 2 minutes, the receiver/driver
automatically pans right for approximately 0.5 seconds.
Two minutes later, a pan left occurs, and the cycle
continues until disabled. The feature is enabled by an
option switch in the receiver/driver, and is controlled by
the
auxiliary 5
function. To activate the
DITHER
function,
turn on auxiliary 5 ; to deactivate, turn OFF auxiliary 5 .
When first enabled, the pan/tilt unit makes one short
left/right cycle to indicate that the
DITHER
function has
been activated. Note that a camera in the DITHER mode
will accumulate a viewing error if left unattended for a
long period of time, so occasionally a manual adjustment
of the pan/tilt may be required.
5.5 Alarm Commands
5.5.1 Arm/Disarm Individual Alarms
Alarm commands control the system’s automatic video
switching capabilities, in response to alarm signals.
When using IntuiKey keyboards, press
Alarm
Control, located on the main Allegiant menu, to
enter a menu screen with these options. To arm an
individual alarm on the monitor currently controlled
by the IntuiKey, press
Arm Alarm , enter alarm
number to be armed via the numeric keypad, and
press
ENTER . To disarm an individual alarm when
using the IntuiKey, press Disarm Alarm , enter the
alarm number to be disarmed via the numeric keypad,
and press
ENTER .
To arm/disarm an individual alarm when using
LTC 8555 Series keyboards, press
Alarm , enter the alarm
number to be armed via the numeric keypad, and press
ON to arm the alarm, or OFF to disarm it.
Using default settings, the camera activated by an alarm
is normally the same as the alarm number, although this
relationship can be changed via the Allegiant PC-based
MCS package. When the alarm number does not match
the camera number, specify the alarm number when
using this command.
The monitor status display (if enabled) shows
CA
(camera/alarm armed) whenever an armed camera is
selected.
5.5.2 Arm/Disarm All Alarms
Press Alarm Control, located on the main Allegiant
menu to enter the menu screen containing these options.
When using the IntuiKey:
To arm all alarms on the monitor currently
controlled, press
Arm All Alarms
.
To disarm all alarms, press Disarm All Alarms .
When using LTC 8555 Series keyboards:
To arm all alarms, press User , Alarm , and then
ON .
To disarm all alarms, press OFF .
5.5.3 Arm/Disarm Monitor
When using IntuiKey keyboards:
Press Alarm Control , on the main Allegiant menu
to enter the screen with these options.
To arm the monitor currently controlled, press
Arm Monitor .
To disarm the monitor, press Disarm Monitor .
When using the LTC 8555 Series:
To arm the monitor, press User , Monitor , . then
ON to arm all alarms.
To disarm all alarms, press OFF .
NOTE: Alarm video will appear on a monitor only if the
monitor is armed and the alarm is armed for that
monitor. The monitor status display (if enabled) will show
MA
(monitor armed).
5.5.4 Alarms Acknowledgement
Bell [Ack] is provided so system operators can respond
to alarms from the keyboard. Pressing Bell [Ack] while
the keyboard is beeping (due to an alarm condition)
always silences the beeper. Depending on alarm
configuration programming, subsequent pressing of
Bell
[Ack] either clears alarm video from the monitors, or has
no effect.