Digital I/O Port Cases
Connecting an Occupancy Sensor to the Digital I/O Port
+5.0 V
1k ohms
SW 2
SW 1
Digital
I/O
Control
Signal
Ground
GND
Voltage
Protection
CTL
Figure 25.
Connecting an Occupancy Sensor to the Digital I/O Port
Port Configured
— Input (switch 1 open, switch 2 open)
Room Occupied
— Digital input reads +2.8 to 24 VDC = Logic High
Room Unoccupied
— Digital Input reads 0 VDC = Logic Low
NOTE:
An occupancy sensor typically su24 VDC when occupancy is detected. After
a defined period when no occupancy is detected, the sensor supplies 0 VDC.
Connecting a Two-position Switch to the Digital I/O Port
+5.0 V
1k ohms
SW 2
SW 1
Two-position
Switch
Digital
I/O
GND
Voltage
Protection
CTL
Figure 26.
Connecting a Two-position Switch to the Digital I/O Port
Port Configured
— Input with pullup (switch 1 open, switch 2 closed)
Two Position Switch Open
— Digital input reads +5 VDC = Logic High
Two Position Switch Closed
— Digital Input reads 0 VDC = Logic Low
TLP Pro 525, 725, and 1025 Series Touchpanels • Reference Material
32