Videoswitch VS-28 - Manual (Page 8)

VS Series 2 User Manual Page 6
Video Switch VST605C.DOC
5. Alarm Handling
On the VS-12A, VS-14A, VS-16A and VS-28A, an alarm input is provided for each
camera. These are for connection to normally open contacts, typically provided by
PIR or other types of detector. When a contact closes, an alarm condition is
triggered on that channel.
5.1 Alarm Hold Time
When an alarm condition selects a full screen display of a camera, this display is
held for the duration of the Alarm Hold Time. If multiple alarms occur, each is
sequentially displayed and held for this time period. The purpose of the Alarm Hold
Time is to ensure that each camera is displayed for a minimum amount of time even
if other alarms occur within a short period of time.
To set the Alarm Hold Time, press and hold the SET key and then also press and
hold the Camera 1 key. Keep both keys held for the required duration. Every second
the switcher will bleep. When the keys are released, a double bleep confirms that the
time period has been permanently stored.
Note that the Alarm Hold Time can not be set if the SET key is locked out (see
section 7.3). The Alarm Hold time is remembered when he unit is turned off.
5.2 Multiple Alarm Dwell Time
When there is more than one alarm, and each alarmed camera has been displayed
in full screen mode for the Alarm Hold Time, the switcher will then sequence
between the alarmed cameras, holding on each for the Multiple Alarm Dwell Time.
This will continue for as long as alarm conditions persist or in latched mode, until
someone presses a key to manually cancel the alarms. When all alarms have
cleared, the switcher will revert to its prior operating condition.
To set the Multiple Alarm Dwell Time, press and hold the SET key and then also
press and hold the Camera 2 key (in the case of the VS-12A, press both the Camera
1 and 2 keys). Keep the keys held for the required duration. Every second the
switcher will bleep. When the keys are released, a double bleep confirms that the
time period has been permanently stored.
Note that the Multiple Alarm Dwell time can not be set if the SET key is locked out
(see section 7.3). The Alarm Dwell time is remembered when he unit is turned off.
5.3 Alarm Relay Hold Time
When an alarm first occurs, the alarm relay in the switcher will activate. When all
alarms have cleared, the relay will stay energised for the further duration of the
Alarm Relay Hold Time.
To set the Alarm Relay Hold Time, press and hold the SET key and then also press
and hold the Camera 3 key (in the case of the VS-12A, use the camera 2 key). Every
second the switcher will bleep. If the keys are released after just one beep, a relay