Load On Input.
Load on = Active low.
Load off = Active high. (Pin 5 of the
connector is internally pulled up to
3.3V with a 10kΩ resistor when the
switch is open. Thus when the
switch is open, pin 5 is logically
high. When the switch is closed, pin
5 is pulled down to the GND
ground level, making pin 5 logically
low)