WHICH ARE THE INCREMENTAL ELECTRONIC INTERFACES?！

NPN and NPN open collector

This type of electronic output is composed by a NPN transistor and a pull-up resistor used to match the output voltage to the power supply when the transistor is off. It has low saturation levels at 0 Vdc and close to 0 at the positive. It is proportionally influenced by the cable length, pulses frequency and by the load, so these factors should be considered to meet the application’s needs.

The open collector variant differs since it has no pull-up resistor, therefore the collector of the transistor is free from the constraint of the encoder power supply, allowing to obtain signals with different voltage.

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