Yes, you definitely have a connectivity problem that has nothing to do with
WeeWX. There is an outside chance the problem is with your RPi. If you have
an extra RPi around, try using it to connect through minicom.

If nothing works, a call to Davis is in order.

-tk

On Fri, Mar 5, 2021 at 5:00 PM monmul <[email protected]> wrote:

>
> So everything reseated and restarted...unplugged USB to ensure that the Pi
> was seeing the USB......used "screen /dev/ttyUSB0 19200" after shutting
> down weewx....still blank screen (after a number Enters) with no echo back
> to TEST and NVR
> On Friday, 5 March 2021 at 17:29:45 UTC+13 monmul wrote:
>
>> pi@WeatherPi:~ $ lsusb
>> Bus 001 Device 005: ID 13fe:4100 Kingston Technology Company Inc. Flash
>> drive
>> Bus 001 Device 004: ID 1a40:0101 Terminus Technology Inc. Hub
>> Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
>> SMSC9512/9514 Fast Ethernet Adapter
>> Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
>> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>> pi@WeatherPi:~ $
>>
>> Having pulled out the line from the Envoy, rebooted, and hit lsusb, by
>> elimination the "Future Technology" must be the one!
>>
>> On Friday, 5 March 2021 at 15:38:45 UTC+13 [email protected] wrote:
>>
>>> or just note which /dev/ttyUSB* comes and goes
>>>
>>> once identified i like to put in a udev rule to create a known device
>>> file such as /dev/vp2
>>>
>>> > On 5 Mar 2021, at 12:33 pm, vince <[email protected]> wrote:
>>> >
>>> > One good way to identify a USB device is to unplug it, plug it back
>>> in, and see what the 'dmesg' command reported. You'll tend to be able to
>>> figure out which USB port it connected to that way.
>>>
>> --
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