Hi Stuart, One guess is that modem manager is probing the serial port[1], messing up the device state. Test after disabling modem manager with: sudo systemctl stop NetworkManager.service
Hope this helps... 1. See e.g. https://sourceforge.net/p/sigrok/mailman/message/35571999/ On Tue, Jun 1, 2021 at 2:20 PM stuart <stu...@xnet.com> wrote: > Hi Christo, > > Well, this is getting interesting: > > > ./sigrok-cli --driver fluke-45:conn=/dev/ttyUSB0:serialcomm=9600/8n1 > --scan > > The following devices were found: > > FLUKE [S/N: 6123456] with 2 channels: P1 P2 > > And turning on logging and setting it to 5 have pushed out and endless > stream of events. I'll look at this in more detail later, but after > failing a transaction where sigrok sent "*IDN?" closing and re-opening > the ttyUSB0 port, sigrok endlessly sends out "FUNC1?", "AUTO?", "FUNC2" > & "AUTO?". The repeats these 4 commands endlessly. > > > > On 6/1/21 2:42 AM, Christo Crause wrote: > > > > On Tue, Jun 1, 2021 at 12:14 AM stuart <stu...@xnet.com > > <mailto:stu...@xnet.com>> wrote: > > > > I should also note that the FTDI adapter I am using contains what > > appears to be transmit and receive LEDs. Both of which are flashing > > when using sigrok-cli w/the --continuous option. Just to verify, > > when I > > use minicom and successfully obtain the current voltage reading from > > the > > fluke-45. I see the transmit and receive LEDs flash while using > minicom > > as expected. So it would seam something is being sent to the > fluke-45 > > and something is being returned from the fluke-45 while running > sigrok. > > But noting is printed out as expected at standard output. > > > > > > My only suggestion is to get diagnostics from sigrok. Try the following > > commands: > > sigrok-cli --driver fluke-45:conn=/dev/ttyUSB0:serialcomm=9600/8n1 > --scan > > > > This should identify the fluke and confirm that communication is working > > properly. > > You can also try omitting the serialcomm option, > > the sigrok-cli example command for scan omits this for its serial based > > example. > > > > You can also increase the log level from 0 (None) to 5 (spew) using the > > --loglevel option, > > which may shed some light on the activity you observe. >
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