Operating instructions

Installation and Operating Instructions
182 Alarm Operation
MECHANICAL ALARMS
A mechanical alarm occurs when there is a contact closure or polarity change at any
alarm input.
The alarm connector provides one alarm input and one alarm output for each camera.
The inputs can be connected to any device equipped with either a contact closure or
TTL/CMOS standard output. The outputs can be connected to any device and can
operate as a contact closure or TTL/CMOS standard device.
Alarm input polarity can be set to either Active-Low or Active-High (see Alarms
Option on page 136). All alarm outputs are automatically set to a low (inactive) state
when starting up the system.
When the unit detects a mechanical alarm:
1. The unit energizes the alarm output associated with the camera.
2. The unit records images from the alarm camera at the alarm record rate and
quality setting.
3. The unit adds the alarm camera to the alarm group and records its images more
often than nonalarm cameras (see Alarm Groups on page 186).
4. The unit lights the Alarms indicator as soon as the alarm is cleared.
5. The unit flags the video segment in the image database with the name of the alarm
input.
6. If the Pre-Alarm Duration option is selected, the unit saves the pre-alarm images
to the image database (see System Setup on page 19, and Use Custom Schedule on
page 76).
7. If the Alarm Message Display option is selected:
a. If the camera is not currently displayed or is displayed in the camera
sequencing window, the unit switches the live display monitor to the 4x4
format and overrides the display settings for the duration of the alarm (see
Display Option on page 139).
b. The unit displays ALARM over the camera image.
c. If the Latch Messages option is selected, the unit enables the Clear Latched
button on the Utility Options screen (see Utility Options on page 53).
d. The unit suspends camera sequencing on the live display monitor.
8. If the Unit Alarm Out option is selected, the unit energizes alarm output 16.
The unit remains in the alarm state until ALL of the following occur:
a. All alarms, including mechanical, are released.
b. The Duration time elapses.