Thanks again for the advice and suggestions. I've used *stty* to see how the ever-reliable RS232 port is configured on the old server and will try setting the new one to mimic it.
I'll try purging modemmanager from the new server. Assuming, though, that the problem is defective hardware, the new server ought to be returnable but I'd have to send it back to the PRC. I wonder whether the serial comms module is replaceable -- that might be more cost-effective than sending the unit back. I'll try a USB<=>RS232 converter anyway. I'll be offline for a couple of weeks but will report back. On Saturday, November 28, 2020 at 3:02:00 AM UTC+13 [email protected] wrote: > Good point. I've had problems with modemmanager doing this. > > > *sudo apt purge modemmanager* > > > > On Fri, Nov 27, 2020 at 5:57 AM Cameron D <[email protected]> wrote: > >> Have you checked that there is not any form of getty running on the port >> - they wait for logins and will steal some of the input characters. >> >> That's rather old school - I don't know how systemd does it. >> >> >> On Friday, 27 November 2020 at 11:00:27 pm UTC+10 [email protected] wrote: >> >>> I think we can say with some confidence that there is something wrong >>> with the UART chip on your new computer. Can you take it back? >>> >>> Alternatively, as Vince says, a serial-to-usb converter. They seem to be >>> more reliable these days. >>> >>> -tk >>> >>> On Thu, Nov 26, 2020 at 8:47 PM kiwigander <[email protected]> wrote: >>> >>>> Ta. The prevalent RS232<=>USB chipset around these parts seems to be >>>> an FTDI. I'll look around. >>>> >>>> On Friday, November 27, 2020 at 4:19:32 PM UTC+13 vince wrote: >>>> >>>>> I was hoping to avoid USB<=>RS232 converters, as I understood they >>>>>> were problematic (in the past) and would add another thing-to-go-wrong. >>>>>> I >>>>>> have one other old device to monitor and it too has only an RS232 >>>>>> interface. Thought I'd be clever and get a low power box with two RS232 >>>>>> ports. >>>>>> >>>>> >>>>> FWIW, i've been running a VP2 with serial datalogger and a serial2usb >>>>> dongle for something like 10 years now. I started with a Shuttle >>>>> mini-pc >>>>> that had serial ports and switched to a little arm box that just has USB. >>>>> >>>>> Never had an issue with the serial2usb from day one. Works great. >>>>> >>>>> You basically just want to make sure you get the right chipset in the >>>>> adaptor. Anything with the PL2303 definitely works. Both mine have that >>>>> chipset, and they were picked up years apart from different suppliers, so >>>>> they used to be pretty much what you always got. I haven't looked in >>>>> years >>>>> to know if that's still the case. >>>>> >>>>> I'm running on a Seagate Dockstar (a 128MB RAM version of the original >>>>> PogoPlug) with a Seagate laptop drive plugged in, and you can see the >>>>> serial adaptor available in the lsusb output below. >>>>> >>>>> root@debian:~# lsusb >>>>> Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB >>>>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub >>>>> Bus 001 Device 003: ID 0bc2:2120 Seagate RSS LLC >>>>> Bus 001 Device 004: ID 067b:2303 Prolific Technology, Inc. PL2303 >>>>> Serial Port >>>>> >>>>> >>>> -- >>>> >>> You received this message because you are subscribed to the Google >>>> Groups "weewx-user" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> >>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/weewx-user/d7e49691-043f-4f6c-a998-dd91c3eaa34an%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/weewx-user/d7e49691-043f-4f6c-a998-dd91c3eaa34an%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/weewx-user/95f8e263-0d64-46de-bf3e-e6089756f45an%40googlegroups.com >> >> <https://groups.google.com/d/msgid/weewx-user/95f8e263-0d64-46de-bf3e-e6089756f45an%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/4e8e3c23-b016-40e6-b1db-19dbcff76aa7n%40googlegroups.com.
