Discrete I/O True High Figure
The following figure shows true high/current sink input/current source output schematic.
Discrete I/O True Low Figure
The following figure shows true low/current source input/current sink output schematic.
This describes a physical implementation of the I/O hardware, which when in the true state, sinks current from the external load.
This describes a physical implementation of the I/O hardware, which when in the true state, sources current to the external load.
