On Tue, 2022-02-22 at 10:31 -0600, Roger Heflin wrote: > I have a wind meter on my roof hooked to a device that counts it's > rotations, and that serial port device would randomly stop working > requiring a reset of the usb-to-serial communication to get it to > function again (I had a cron job to reload/reset the usb nightly > because it was happening often enough). I guessed ground loop ran a > ground wire to house ground and grounded the hw device doing the > counting years ago, and that solved the issue. That one may have been static build-up. Things with wind blowing over them often have such problems. Ground loops are where there's a loop formed by several grounds that connect together. When you have faults caused by ungrounded things that go away when you add a ground, that's not a ground loop fault, that's a lack of grounding problem. If you find that strapping the cabinets of equipment together helps reduce faults, it could be the house mains wiring has an earthing fault (or the wall socket, or power strip, you're using). You can find with a lot of modern equipment, they don't ground the internals, and it becomes susceptible to static build up and discharge faults. Mains spikes can cause failure as the modern groundless power supplies will capacitively couple active and neutral to the common rail of the power supplies output. Now, instead of current going to the mains power earth, it goes through the equipment. Even without any spikes, the output floats at a high voltage, and when you connect things together sparks fly between the two (hence the recommendation to hook equipment together *before* plugging the mains power in). That kind of thing was the cause of death of CD player outputs, home video camera DV ports, etc. They didn't like a 400 volt sudden charge through something that only worked with very low voltages. -- uname -rsvp Linux 3.10.0-1160.53.1.el7.x86_64 #1 SMP Fri Jan 14 13:59:45 UTC 2022 x86_64 Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
