3.3.2.1. Active-High Digital Input Connections
A digital input is typically connected to a switch that is either open or closed.
▪ When an active-high switch is open, the pull-down resistor ensures that no
voltage exists on the input signal, which will be interpreted by the PHD as
inactive.
▪ When the switch is closed, the input is connected to battery voltage, which
will be interpreted by the PHD as active.
For an input that is active-high
▪ It must be connected to battery power so that there is a battery connection
when the state of the input changes.
▪ The power provided to the digital switch connected to the input must be
provided through a fuse in the wire harness.
A typical active-high digital input connection is shown below:
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