The open collector of incremental encoder！

A second output type is an Open Collector (NPN transistor) (Image 4). NPN Open
Collector encoders “sink” current from sourcing (PNP) PLC inputs. Sinking and sourcing inputs simply refer to the current flow in a transistor.
An Open Collector encoder has A, B, Z, and 0V wires (and a wire for +DC to power the electronics). NPN Open Collector (sinking) encoders require the master PLC or motion controller to have PNP (sourcing) inputs. Open collector encoders usually accept a wide range of voltage.

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