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Hi All,
Odd question, I am having issues with a device plugged into a USB hub of a touch screen PC, when it was connected to an old Win7 desktop via USB it worked with no problem. I'm guessing between 7 and 11 the USB driver changed (it would have to) and now the Win11 the device is unreliable and needs resetting. I wonder is it the device or the driver. It appears that the company does not have any specalised drivers so it's a standard com port.
Can this be an issue?
Glenn
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If a hub is involved, my first suspicion is always power.
+5V ain't what is used to be (says an old time engineer).
You know where to put the multimeter prods...
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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I am a Linux fan, does Windows have an application to actually monitor / reed / guess the USB device power "in use " ?
Never seen such app in Linux, but did not bother to look for it.
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Just had a dig and found my USB power meter!
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As an electronics/hardware guy replying to another, I was suggesting a physical measurement, and comparison between the two physical environments.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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I know, but if it's the bus power...
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Slot in a powered hub?
Or I think they still make power injectors - signals straight through, solid +5 comes in the side.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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I will try that... have search my pile for an 9way RS232 cable, 'we don't have those things, why do you want one?'from IT... it gets worse! 
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It's sometimes hard to say what is windows versus what is a device manufacturer doing something in their driver.
I'm pretty sure I have had Windows 10 tell me I was pulling too much current on the USB and shut the port down temporarily (not a timer - it tells you to go turn it back on if it's OK).
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Lost a couple of hours to that this afternoon!
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Yup! 5.00 ish, Plugged into a dodgy hub... Interesting unit can crash and not appear as a com port...
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Since I've been working with usbser.sys (>10 years), I've repeatedly encountered problems with the part. Since W10/11, power management has also been added to usbser.sys. This could be a cause of your problem; It's best to turn it off if possible.
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Thank You! Got Senior to read this! with your reply I can prove it's not my program causing issues!
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glenn, it's simpler than that... as soon as I get out of a meeting, I'll give you more details. Lived this for 20 years
Charlie Gilley
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
Has never been more appropriate.
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- "when it was connected to an old Win7 desktop via USB it worked with no problem"
Explain this please. device was plugged in directly to the PC? If the PC was old, USB 2.0?
- is the touch screen a real PC running Windows 11? I want to be clear to make sure we're not talking about a WinIOT bastard child or something.
- Forget about any power issues. The first thing to check is what type of hub are you putting the old device into? USB is allegedly universal, but I've seen issues with older devices.
Note on the power comments: this absolutely used to drive me instance - Windows helping to save power by turning off devices. Its like MS lives in some other dimension. First thing I would do after plugging your device in is go to Device Manager. See if you have a driver issue. Your device may be sol old it's just not supported under Win11. I have a basket full of these things.
Charlie Gilley
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
Has never been more appropriate.
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Thanks for the link, could be a Microchip thinks it's an ATMEL
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Unfortunately the most intersting link (http://www.microchip.com/forums/download.axd?file=0;538194[^]) is not longer available 
That was an explanation of the low level stuff. Maybe I saved some parts of that link, I will search for it.
On the other hand, it was before >10 years. Maybe @charlieg has better information. I'm keen on his advices 
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Nuts, it would be useful, at least it's not my dodgy code 
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I need to interface to a very simple device with a USB port on the older Win 7 machine the driver worked, all was good. PC gets changed and upgraded to 11.
The software device get tricky to use, I implement a bodge that is documented, but not in the correct place, as I'm not allowed to update the documents, get told off for it as I have modded the software and not updated the documents, told to undo my mods which prevent crashes, Head interfaces to desk.
I'm guessing the PC on which it worked was was USB 2, but the powers that be dictate it has to be a touch PC connecting to the companny network able to run Epicore (why?), suddenly my software gets unreliable and starts to crash the device on the other end.
As for the power issue, I have checked the power levels and the Hub it was plugged into sits at around 4.5 to 4.8 Volts on the power line, plugged in directly 5.02 Volts, there may be something it.
The device appears in Dev Manager and at times disappears and reappears when connected to the hub
directly to Com 1, it says connected permantly and it the device occasionally crashes.
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When I post here , asking for help
do I have to spell it out ?
"...I am looking for a solution..."
is it not obvious?
or is this forum now a " social media chat " box?
Reason for THIS post
I have recently experienced a "reply" which basically
restated / reformatted my post
and did not actually offered a solution.
End of rant
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The members of this community all help others for free on their own time, so the help you get can range from amazing to...not always amazing. We, generally, try though.
If there's a response to one of your questions that's inappropriate you can vote it down. If there's a response which is trying to help you format a question in a way that makes it easier for others to answer then that can be helpful.
Without knowing the post I can't really address your specific complaint.
cheers
Chris Maunder
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I do appreciate you taking time and respond.
As noted - it was a rant...
It is normal to meet people with different attitude, and
I do not believe judging, pointing out specific
would be helpful, mainly because when the one who acquires attitude " I am better then you are "
is generally immune to any suggestions to change.
I have been using and (sometime ) abusing this forum for years and most of the time the discussions have been on very professional level and helpful.
And I do appreciate that.
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Salvatore Terress wrote: would be helpful, mainly because when the one who acquires attitude " I am better then you are "
is generally immune to any suggestions to change.
Years ago on a 'newsnet' channel (or whatever they were called then) on a technical forum for a specific language a specific user routinely told people to RTFM. Not politely. And he would go off on a rant if anyone questioned him.
Now he literally was in fact 'better than your are' probably 100% of the time because he, at that time, authored at least two books on the language. I know they were good books because I bought both of them and at least one of them I considered a primary source. (If I actually remember the name correctly then I still have books by him and they are still primary sources.)
Surprising to me given that situation how inflammatory his posts were. I can't say he was the most negative poster that I saw but he certainly ranked up there.
Salvatore Terress wrote: I do not believe judging,
So don't. Instead laugh. That is what I do. The more outrageous the more amusing I find it.
Certainly when they denigrate someone (including me) they are certainly not proving to anyone that their knowledge is better. Nor that their ability to communicate is better. Because of course if both of those were true then they could provide a clear and concise answer instead.
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