Dear Sir, please answer
I'd like to use RS485 (ADM2481) at a range 200 m. Please, see attach "figure 1".
I'd like to use circuit protection diodes VD1 and VD2.
Questions: 1) do I need to connect 0V-2 and "Ground"?
2) Or I can connect as shown on the "figure 2" i.e. don't connect 0V-2 to "Ground" at all ?
I added a second question
[edited by: naumenkov123 at 7:22 AM (GMT 0) on 3 Mar 2020]