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Kramer Electronics Ltd.
FC-7P
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18
GPIO sub-ports are displayed according to their DIP-switch settings.
The default parameter settings change depending on which trigger type is selected.
When DIP-switches 1 and 2 are set down to Relay, GPIO ports 1 through 4 are grayed out
and the following GPIO port settings screen appears:
Setting Digital In Trigger Parameters
Figure 14: 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.