Extron electronics IPCP Pro Series User Manual page 46

Digital I/O digital input with pull-up enabled
•
When the port is configured for pull-up, switch 2 is closed, activating the
•
+5.0 VDC 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
CTL
SW 1
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.
Digital
I/O
Voltage
Protection
GND
IPCP Pro Series • Hardware Features and Installation
Two-position
Switch
38