I analyzed the dispute ,I worked with 4-20mA device and designed 4-20mA tranmitter also. But I did not get completely your replies on isolation ,It is better for me that you say clearly that is it
better to place isolation between adc and micro or micro and rs485?

I'm very unhappy, Parviz. All our work, all our explainations, all our discussing, all our schematics were for nothing? I'm asking myself, whether not better investing my costly time and energy into other stuff, doing my own projects perhaps, instead of trying to help people, which are not willing to spend a minimum of time and intelligence to analyze our helpings.

A very sad leaving Kai.