Usually yes, because you need to ensure that the RS485 signals are within specified range referenced to it's GND.Is it necessary to have a shared GND between my max485 and encoder?
Hello back,
Here is my circuit with high resolution.
View attachment 153654
Based on inductive noise, short-circuit, ... I have to use optocoupler to isolate my micro-controller from high-voltage. However for Max485 it seems I should connect both GND to each other.
Thank you for all useful help.KlausST
Thank you for your suggestion, I was thinking about the isolated one as you recommended. But it is more expensive for my application.asdf44
Can you let me know my mistakes ?kripacharya
Thank you for your explanation. But I didn't understand well what you said.wwfeldman
It means I should connect both GND and GND1 to each other for serial connection. Butthe dotted line separating the two sides must be continuous and there can be no physical connection from one side to the other
what does it mean?you cannot tie the grounds together
In my diagram, for simplification, I just showed data lines only by two wires.(it is AB,YZ input and output)where does the output of the encoder/485 go?
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