LaserNET Program User's Guide
September 2003
TM0048
6-11
Figure 6-10. Output Latching Window
6-5.4.1
LATCHED ALARMS
When alarms are configured for latching, the alarm outputs will require a manual reset to clear the alarm
condition once the smoke level has dropped below the alarm threshold(s).
To set latching alarms:
1. Check the Latch Until Reset box in the alarms box.
2. Select
<OK>
to save the configuration.
6-5.4.2
NON-LATCHING ALARMS
When alarms are configured for non-latching, the alarm condition on the Detector will clear after the smoke
level has dropped below the programmed threshold and the programmed latch period has expired. The
following conditions apply:
The latch period can be set from zero to 60 minutes in one minute increments.
If the smoke level rises above the threshold during the latching period, the timer is reset.
To configure:
1. Ensure that the Latch Until Reset box is unchecked (see above).
2. Select the Latch Period field in the Alarms box. Enter the new value.
3. Select
<OK>
to save the configuration.
6-5.4.3
LATCHING FAULTS
Fault conditions are normally configured for non-latching, in that the fault indication will clear automatically
as soon as the fault condition disappears. For troubleshooting purposes, it is sometimes desirable to make
faults latching, so that the fault will require a manual reset to clear the fault indication after the fault condition
is cleared. To configure:
1. Check the Latch Until Reset box in the Faults box.
2. Select
<OK>
to save the configuration.
6-5.5
Signal Averaging
Some environments may have transient ambient conditions which will sometimes cause spikes in the smoke
level reading, even when the system is normal. The signal averaging feature allows these spikes to be
averaged out over a fixed time period to provide a smoother system response and help eliminate unwanted
alarms.
The green Average indicator on the display and control graphic will be lit when this option is enabled.
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