Vista Triplex2, User Manual

Page: 81 / 88

0150-0319A 81 Vista Triplex
2
CDR/DVD
8.3 Alarm/Event Fields
The two least significant bits are currently used for the Event commands. Bits 2 and 3 are used for the
Alarm commands.
7 6 5 4 3 2 1 0
MSB LSB
Event Start
Event Stop
Alarm Start
Alarm Stop
8.4 Alarm Actions
No Alarm Change – 0000 00XXb
If both the start and stop bits are clear, the alarm status and camera record rates will remain
unchanged.
Start Alarm – 0000 01XXb
If only the start bit is set, the Vista Triplex
2
CDR/DVD will enter the Alarm mode. The selected camera
will become the alarm camera. Pre-alarm video will be recorded and the Alarm Record Rate will be
initiated.
Every Start Alarm command should subsequently be followed with a Stop Alarm command
at some point. Failure to do so will render that alarm input useless, even if the alarm was
latched and gets acknowledged from the front panel. A Stop Alarm followed by a Start Alarm
will have to be sent to create a new alarm on that channel.
Stop Alarm – 0000 10XXb
If only the stop bit is set, the selected camera’s alarm status will be cleared. If no other alarms are
present, the Vista Triplex
2
CDR/DVD will exit the alarm mode.
Momentary Alarm – 0000 11XXb
If both the start and stop bits are set, a momentary alarm will be initiated on the selected camera. Pre-
alarm video will be recorded at the alarm record rate, after which the Vista Triplex
2
CDR/DVD will
continue to record video at the normal record rate.
NOTE