ehsantech
Member level 3
Hello,
In my circuit I used two different adapter to isolate my ARM from my remote driver(with an optocoupler)(Two different ground wires are available). Now I want to add Max485 chip to my circuit to get encoder data. My main problem is with ground wire. Regarding this circuit, I connect adapter2 +V,GND to my encoder input voltage, and connect adapter +V,GND to feed the max485. Is it necessary to have a shared GND between my max485 and encoder? in this mode I should connect both GND to each other which disables my isolation that I created with my optocoupler.
what is your suggestion?
In my circuit I used two different adapter to isolate my ARM from my remote driver(with an optocoupler)(Two different ground wires are available). Now I want to add Max485 chip to my circuit to get encoder data. My main problem is with ground wire. Regarding this circuit, I connect adapter2 +V,GND to my encoder input voltage, and connect adapter +V,GND to feed the max485. Is it necessary to have a shared GND between my max485 and encoder? in this mode I should connect both GND to each other which disables my isolation that I created with my optocoupler.
what is your suggestion?