Configuring a Digital Input Trigger Type
Digital Input trigger mode reads the digital input of an external sensor device that is connected
to the GPIO port, and detects High (upon passing Max threshold from Low state) or Low (upon
passing Min threshold from High state) port states according to the user defined voltage
threshold levels.
To configure a digital input trigger type:
1. On the GPIO Ports Settings page, select Digital IN from the Trigger type option box
(Figure 10
).
The Digital IN options appear (Figure 10).
2. Select one of the following for the Pull-up resistor setting:
• Enabled
Detection of 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 resistor is enabled, the port state is high and to be triggered it must be
pulled low by the externally connected sensor.
• Disabled
Suitable, for example, for a high temperature alarm that exceeds the maximum voltage
threshold.
When the pull-up resistor is disabled, the port state is low and to be triggered it must be
pulled high by the externally connected sensor.
3. Define the Min and Max for the Threshold VDC range (threshold voltage at which the
port changes state) and click Set.
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