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K-CONFIG –
Assigning the Controlled Devices to Master and Auxiliary Device Ports
103
7.2.1
Digital Input
Digital Input mode reads the digital input of an external sensor device that is connected to the GPI/O port, and can be
defined:
With Pullup: by configuring in this way, the room controller can be used to detect an open circuit
(which is detected as Hi); or a short to ground (which is detected as Lo). 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.
Without Pullup: the room controller detects the voltage levels and translates them to High or Low
according to the user defined threshold levels.
For example, a high temperature alarm that exceeds the maximum voltage threshold.
Setting the Digital Input
In this example, an alarm causes a short circuit, thus activating a trigger.
To set the trigger:
1.
Define the GPI/O in the Port Manager.
Check
Pullup
for short circuit detection; the threshold is set automatically (
skip step 2
):
Do not check
Pullup
for voltage level detection; the threshold to be set by the user (
proceed to step 2
):
2.
Click the
Threshold
button to define the
GPI/O Threshold
(minimum from 0 and maximum up to 30V)
according to the indication set by the controlled device (other voltages will not activate the trigger).
Figure 192: GPI/O Threshold Window
To learn more about GPI/O Events, go to
Section 8.4
7.2.2
Digital Output
The digital output mode function is defined by the pull-up resistor setup:
•
Without Pullup: The port is used for controlling external devices such as room or light switches. The external
source device determines the voltage output; the maximum voltage is 30V DC and the maximum current is
50mA.
Note
: take care that the current in this configuration does not exceed 50mA!
•
With Pullup: the port can be used for controlling devices that accept a TTL signal such as for powering LEDs.
The voltage output is TTL positive logic: open: ~2.4V; closed: ~0.2V.