Losing USB connection when restart laptop
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Dear All,
I'm controlling my duet over USB, but i noticed that when I restart my laptop, while the USB is still connected to the duet, that upon start up, the duet is not responding anymore. It than requireres me to unplug the USB and to plug it back in, which is a bit enoying. I also noticed that when i power my duet first from the VIN and than plug in my USB, it is not responding aswell.
I there any way to circumvent this behaviour?
Kind regards
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@Tricep-terry said in Losing USB connection when restart laptop:
the duet is not responding anymore
Can you be more specific about what you mean by this?
@Tricep-terry said in Losing USB connection when restart laptop:
I'm controlling my duet over USB
Do you mean for print jobs, or just USB terminal, or what exactly?
@Tricep-terry said in Losing USB connection when restart laptop:
I also noticed that when i power my duet first from the VIN and than plug in my USB, it is not responding aswell.
Are you taking steps to avoid USB ground loops?
https://docs.duet3d.com/en/User_manual/Overview/USB_ground_loops
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Dear Phaedrux @Phaedrux
Sorry for the missing details, I'll explain the scenario more clearly.
I've a thirty party software that uses python to send single line Gcode to the duet over USB, the USB is connected via a USB isolated (adafruit, the recommended one by duet). When I leave my USB plugged into the laptop and I restart the computer, the communication with the Duet stops, for example if I after restarting the PC open the YAT terminal and send something like M115, i get no response.
If i unplug the USB cable and plug it back in, the connection is restored and I can send codes via YAT as usual.
Furthermore, If I power my duet by VIN first and then plug in the USB cable the same behaviour is present as in no communication to duet via programs like YAT. With or without the USB isolator makes no difference (I only test this if my laptop is running on batteries) so the problem is not with the USB isolator.
I've checked and tried to change USB suspend behaviour, but this did not fix the issue.
Is there something else I could try?
Kind regards,
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@Tricep-terry What operating system is the laptop running?
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@gloomyandy it's windows 11
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@Tricep-terry What firmware version are you using? I know v3.3 or an older release had an issue in the USB stack causing this kind of problem, so make sure you are at least on v3.4.6. Also, make sure to properly close the USB connection of your serial control application before you restart your laptop.
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I've updated to V3.4.6 but the issue persists, I don't think it is my python code as the issue is also there when I do the following:
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plug in USB cable into PC
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open YAT terminal
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send M115 to test for connection, which than responses as intended
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close YAT
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restart laptop
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open YAT terminal
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send M115 to test for connection, no response, while the terminal at the bottom right says that the com port is open and connected
to restore the functionality:
- un plug USB cable
- plug in USB cable
- send M115 to test for connection, which than responses as intended
Could you let me know if by performing this sequence of events, you obtain similar results?
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@Tricep-terry I can try to reproduce it. What Duet do you have?
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@chrishamm I've a duet 3 mini 5+
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@Tricep-terry I can reproduce it with v3.4.6 but not with v3.5.0-rc.3+. I suggest you upgrade to that version.
@dc42 do you know if a fix has been backported to 3.4-dev? -
@chrishamm that indeed did the trick. It also fixed the issue with the order of powering the device. Many thanks.
