hello

To Karas:
I saw your interesting picture about isolation.
Please give me more comments on isolation (two way or three way?) and count the benefit of each method.

To Kai and others:

Kai ,I prefer isolation between adc and micro ,because any noises from field that is in input section will not pass through isolation ,and no eeprom data of micro will be corruptd,there are lower level of noises in rs485 ,because it does not have any contact with dangerous field signals.

bye