Basically there are two types of incremental or quadrature encoders, which means there is two wave forms out , (generally square wave) that have a 90deg phase shift between the two (hence quadrature).
The two types of general outputs are single ended or differential. Single ended means that there is one output per wave form, which can be open collector or with pull up resistor.
Differential means there is a line driver output which supplies two square wave outputs per waveform, one is the complement of the other. So you end up with four outputs for the two wave forms.
The benefit of differential is that they are not as prone to noise pickup as single ended are.
Al
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |