VESDA VLI Product Guide
VESDA by Xtralis
28
www.xtralis.com
3.4.3
Unmonitored General Purpose Input (GPI) Functions
The unmonitored GPI can be configured to initiate a number of different actions - including, by
default, a Remote Reset function.
The GPI can be configured through Xtralis VSC or through the 'Miscellaneous’ screen menu of the
LCD programmer. Refer to the Xtralis VSC Online Help or LCD Programmer Product Guide for
further details.
Refer to section 3.2.4 for further information on GPI wiring.
Table 3-5: GPI Functions
Function
State Change
External Reset
Detector Reset when ≥ 5 VDC is at this
terminal.
Mains OK
The detector monitors the state of the
external power supply and responds to the
following conditions.
l
Mains OK ≥ 5 VDC at this terminal.
l
Mains Fail ≤ 2 VDC at this terminal.
Standby Mode
The detector Isolates and the aspirator
turns OFF when ≥ 5 VDC is at this
terminal.
Note:
No Alarms can be generated in
this state
Isolate
The detector isolates when the voltage
rises above 5 VDC and de-isolates when
the voltage falls below 5V.
Use Night-time
Threshold
The detector switches over from day-time
to night-time thresholds when ≥ 5 VDC are
at these terminals.
Reset + Isolate
While power is applied to the GPI the
detector is isolated. In addition, the
disconnection or connection of power to
the GPI resets the unit.
l
≥ 5 VDC detector isolates.
l
≤ 2 VDC detector reset.
Inverted Reset
This is the reverse of the normal reset
function.
l
≤ 2 VDC detector reset.
l
≥ 5 VDC normal operating mode.
Notes:
l
The signal voltage into the GPI terminals must be between 5 to 30 VDC.
l
When the detector is isolated, de-isolated or set to standby as a GPI function, the status
cannot be changed through the normal isolate/de-isolate/standby functions of the Display
Module or the LCD Programmer.
l
When the night-time threshold is configured as a GPI function, it overrides the clock settings
for day-start and night-start.
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