Things to try: 1. Ferrite coils might help, although you are getting a lot more errors than what is normally associated with EMI.
2, Another possibility is that something else is trying to claim /dev/ttyUSB0. For example, modemmanager has been known to do this. To see a list of processes using /dev/ttyUSB0. lsof | grep ttyUSB0 Unfortunately, this will only tell you if something is using it at the moment. 3. It's worth looking at the details of your USB connection: lsusb -v -d 0403:6015 On Mon, Apr 27, 2020 at 11:04 AM Praveen Chandrasekaran < praveen.c...@gmail.com> wrote: > Attached syslog (all today's entries). The USB disconnect has happened > around 6 times today). No major issue as it recovers but just wondering > why. Need to buy a ferrite coil. > > On Mon, 27 Apr 2020 at 23:24, Praveen Chandrasekaran < > praveen.c...@gmail.com> wrote: > >> Sorry, just ignore the part of serial/USB. I got confused with different >> data logger types available. Will attached detailed log in a few minutes. >> >> On Mon, 27 Apr 2020 at 22:07, Tom Keffer <tkef...@gmail.com> wrote: >> >>> Don't know what you mean by "Mine is a serial port on Vue side." >>> >>> "usb issue must be on pi side." Not sure what you're asking here but, >>> yes, the USB plugs into the pi, and that's where the assignment to /dev >>> occurs. >>> >>> The very short screenshot you included doesn't offer many clues as to >>> the cause. >>> >>> The output from 'dmesg' may also give clues. >>> >>> Yes, ferrite coils tend to help. >>> >>> -tk >>> >>> >>> >>> On Mon, Apr 27, 2020 at 9:13 AM Praveen Chandrasekaran < >>> praveen.c...@gmail.com> wrote: >>> >>>> Thanks. I already hav the udev which is why it auto recovers. Mine is a >>>> serial port on Vue side. So the usb issue must be on pi side I assume? >>>> Ferrite coil should solve the problem? >>>> >>>> On Mon, 27 Apr 2020, 21:26 Tom Keffer, <tkef...@gmail.com> wrote: >>>> >>>>> See the section *Davis cp2101 converter problems >>>>> <https://github.com/weewx/weewx/wiki/Troubleshooting-the-Davis-Vantage-station#davis-cp2101-converter-problems>* >>>>> in >>>>> the Wiki. The following section, *Installing a udev script >>>>> <https://github.com/weewx/weewx/wiki/Troubleshooting-the-Davis-Vantage-station#installing-a-udev-script>* >>>>> shows >>>>> how to solve the problem. >>>>> >>>>> On Mon, Apr 27, 2020 at 8:24 AM Praveen Chandrasekaran < >>>>> praveen.c...@gmail.com> wrote: >>>>> >>>>>> Hi, >>>>>> >>>>>> Weewx log is reporting USB disconnects to Vantage Vue now and then >>>>>> (uploaded snippet, not able to copy from putty to windows) >>>>>> >>>>>> It recovers on its own everytime. 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