Thanks, that information is very helpful.
Is it best to hard tie Logic ground to Earth/chassis ground at the power supply or at the PCB being powered? I've seen Logic ground connected directly to plated through holes on PCBs (TS-7400 SBC made by Technologic Systems) and maybe the reason they are designed that way is to make it easy to make the Logic ground to Earth/chassis ground connection. If the connection was made at a PCB like the TS-7400 I would think it would be a good idea to only connect one plated through hole to Earth ground to avoid ground loops or is there a scenario when multiple connections would be desirable?
How is EMI performance and ESD immunity improved by making the Logic ground to Earth ground connection?
I hope you don't mind all the questions; I learn best when I have all the angles covered in my mind. On that note can you recommend a good book or other resource on these types of things?