NT-52P –
Remote Operation via the Web UI
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The default parameter settings change depending on which trigger type is
selected.
7.7.1
Setting Digital In Trigger Parameters
Figure 17: GPIO Port Settings Page Digital IN
Set the trigger type to Digital In (default). With this selection, the digital input trigger
mode reads the digital input of an external sensor device that is connected to the
GPIO port. It detects high (upon passing Max. threshold from Low state, default
2.2V) or low (upon passing Min threshold from High state, default 0.8V) port states
according to the user defined voltage threshold levels:
•
Pull-up resistor enabled (default)
Detects an open circuit as High, or a short to ground as Low. This is suitable
for example, for a pushbutton switch (connecting one terminal of the switch to
ground, and the other to the input) or for an alarm closing a circuit that
activates a series of actions.
When the pull-up is enabled, the port state is high and to be triggered it must
be pulled low by the externally connected sensor.
•
Pull-up resistor disabled
Suitable, for example, for a high-temperature alarm that exceeds the
maximum voltage threshold.
When disabled, the port state is low and to be triggered it must be pulled high
by the externally connected sensor.
