User's Guide

LSP3A Clear User’s Guide
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level of the port should match the active voltage to set the external alarm device
wired up.
In section GPIO2, select one of the available options:
 GPIO: Port has no predefined function; it can be driven remotely by Host PC via
API.
 Output Trigger: when Theft is detected(EAS or AFI signal setting the alarm), the Port
Signal level matches the Active Level Setting(“Low” or “High”). The output voltage
level of the port should match the active voltage to set the external alarm device
wired up.
Whenever the GPIO is set as an Output Trigger, It is possible to set a pulse Width and a
Pause in milliseconds: In Figure 5.16, the Pulse Width is set to 400ms. This means that whenever
theft detection occurs, the signal on port#2 will go from low to high level for a minimum time of
400ms. If no further detection occurs before the 400ms timing laps, then signal will drop to low
level.
Whenever after the Pause timing, if a new detection occurs, signal will rise again to high
level.
In the particular case of the Pause Timing set to 0ms, whenever detection will occur timing
equal to Pulse setting will be added up so that the active level will stay high as long as detection
will occur (so called retrigger configuration).
Setting pause timing to a value different from zero will force the output signal to low level for
Pause time after the Pulse time set, before being triggered again by a subsequent detection.
Figure 5.16: GPIO Output Trigger