Videotec SM328B - Manual (Page 24)

• enabling the buzzer
3.4.14.1 ID text
The text can have a max. 28 characters and the procedure to define it is the same for ID texts for the
cameras.
3.4.14.2 Reset modes
Each alarm can be silenced in various ways and the reset mode setting for one alarm will not influence the
other alarms. If more than one reset mode is defined for the same alarm, this alarm will be silenced by
recognition of the first reset from among the definitions.
Four reset modes are possible:
• Continuous type reset: when the alarm signal ceases (instructed by a control centre for example) the
alarm event is silenced
• Keyboard reset: keyboards able to reset the alarm are indicated
• External reset: the alarm is silenced by an external reset trigger
• Time reset : the alarm is automatically silenced following a specified time after acknowledgement. This
time can be selected from among 2, 5, 10, 20, 30, 60 seconds; 2, 5, 10, 15, 30, 60 minutes; 3, 6, 12
hours.
Notes
Do not use the continuous type reset if the alarm signal is of the pulsed type (supplied by a sensor attached to a door
for example)
The keyboards should be enabled when they reset.
The external reset trigger should be enabled to be able to reset the alarms by external reset.
3.4.14.3 External Alarm Reset Trigger
The external alarm reset trigger is
supplied via BNC:
If used, the external reset signal can be set as active on the down front (NEG) or on the up front (POS) of
the trigger impulse.
The minimum length of the reset alarms impulse is 30 ms.
3.4.14.4 Enabling the alarm contact
Acknowledgement of alarm events can be limited to specific periods (open or closed period, always or
never; the latter is useful if the alarm is to be temporarily disabled without losing the already completed
setting, when testing a system for example).
Irrespective of these settings, enabling of alarm contacts can be further modified by Time Contact Events
(3.4.16 Time Events, page 23).
3.4.14.5 Effects on the monitors
When an alarm is acknowledged each video output may react differently:
• the alarm may be ignored
• a fixed camera may be shown
• a pre-defined switching sequence may be shown.
To change the effect on a monitor press the corresponding number; then press
0
to ignore the alarm,
1
to request a switching sequence,
2
to request a fixed camera.
• 3. Setup Page 22/65 MNVCSM328A_0438