Advantech RS-485 user manual Grounding, ‘Earth’ for reference

Appendix F

3.Noise Reduction Techniques

4.Check Point List

F.1 Grounding

1.1 The ‘Earth’ for reference

Why we think the

EARTH as GROUND?

As you know that the EARTH can t be conductive indeed. But those parallel resistors make the EARTH as a single point and just for reference.

Figure F-1: Think the EARTH as GROUND.

•Why we think the EARTH as GROUND?

As you know that the EARTH can not be conductive indeed. But all buildings base on EARTH. Steels, concretion and relational cables such as Lighting Arrester and power system were connected to EARTH. Think them as resistors, then those infinite parallel resistors make the EARTH as a single point and just for reference.

ADAM-5000 F-3