IPCP Pro Series • Hardware Features and Installation 38
• Digital I/O digital input with pull-up enabled
• When the port is configured for pull-up, switch 2 is closed, activating the
+5.0VDC pull-up resistor.
• When an external switch closes (shorts to ground, logic low), the port is on and
the front panel LED is on.
• When the external switch opens (logic high), the port is off. The front panel LED
is off.
• Example application, digital input with pull-up: connecting a two-position
switch
+5.0 V
1k ohms
SW 2
SW 1
Two-position
Switch
Digital
I/O
GND
Voltage
Protection
CTL
Figure 35. Digital I/O Digital Input Application:
Two-position Switch With Pull-up
Two-position switch is open: logic high, front panel LED is off.
Two-position switch is closed: logic low, front panel LED is lit.
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