Extron electronics IPCP Pro Series - Page 45

IPCP Pro Series • Hardware Features and Installation 37
• Digital I/O digital input with pull-up disabled
• Digital input is triggered by an external switch or voltage between the digital
input pin and ground.
• Example application, digital input without pull-up: occupancy sensor
connection:
Control
Signal
Ground
+5.0 V
1k ohms
SW 2
SW 1
Digital
I/O
GND
Voltage
Protection
CTL
Occupancy
Sensor
Figure 34. Digital I/O Digital Input Application:
Occupancy Sensor, Without Pull-up
Room occupied: logic high, front panel LED is off.
Room unoccupied: logic low, front panel LED is lit.
NOTE: Occupancy sensors typically supply +24VDC when occupancy is
detected. After a set time with no occupancy, the sensor supplies 0VDC.