VESDA-E VEP-A00-P Product Guide
64
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Function
State Change
Use Night-time
Threshold
Unmonitored GPI
l
The detector uses night-time
thresholds while ≥ 5 VDC.
Monitored GPI
l
The detector uses night-time
thresholds while the contact is
closed.
Note:
While the GPI is off (contact
open, voltage ≤ 2V), the day or
night thresholds are determined
according to the internal clock
and the configuration of the
detector (using Xtralis VSC).
0V
5V
Night
Day or Night
Day or Night
Open
Closed
Night
Day or Night
Day or Night
Reset + Disable
Unmonitored GPI
l
Detector resets on a 0 VDC to 5 VDC
rising edge and on 5 VDC to 0 VDC
falling edge, and;
l
Detector is held disabled while ≥
5 VDC.
l
Detector is enabled on a 5 VDC
to 0 VDC falling edge.
Monitored GPI
l
The detector resets on closure or
opening of the contact, and;
l
The detector is held disabled
while contact is closed.
l
The detector is enabled when
the contact opens.
0V
5V
Reset and
enabled
Disabled
Reset
Open
Closed
Disabled
Reset
Reset and
enabled
Inverted Reset
Unmonitored GPI
l
The detector resets on a 5 VDC to 0
VDC falling edge.
Monitored GPI
l
The detector resets on the opening of
the contact.
0V
5V
Reset
Open
Closed
Reset
Table 5-3: GPI Operation (continued...)
Notes:
l
When using the standby or disable options it is recommended that all remote displays on VESDAnet are
configured to have the Isolate button locked out.
l
When the detector is disabled or set to standby via the GPI, the status cannot be changed through the
normal enable / disable function on the front panel or via Xtralis VSC or a remote display. Refer to
Section 2.3.2 on page 6 for further information.
l
When the night-time thresholds are invoked via the GPI, the clock settings for day-start and night-start
are overridden.
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