AnsweredAssumed Answered

handling RS-485 gnd

Question asked by AlgaeEater on Jul 30, 2012
Latest reply on Aug 1, 2012 by bookevg

Hi All -


Am working on a design using the AMD2687 for an grid biomass project.

There are multiple drops across 1500ft.

Power is 24V DC and there are some large pumps and stirrers drawing >50A with significant spikes.


How should I handle the RS-485 gnd ?

I have seen designs where it is tied to local ground through 100 -> 1k resistors.

Your app notes mention Y2 safety caps, but there is no AC in the system.

It does not seem right to just let it float.


This is a new area for me and would appreciate any help and apologize if the question is too trivial...