Programatically close a USB port

Is there any way to programatically close a USB port?
Sometimes when accessing my USB device if an error is encountered the port will not close properly and then will not allow the device to be accessed the next time without unplugging or reseting the computer first. I have seen something about a RAW USB name being used to control the USB ports through the VISA functions but I didnt know if this was the correct way to handle this situation and also didnt know how to obtain the RAW port name. Essentially I want to deactivate/reactivate a port before I run my program to be sure the port is not busy.
Thanks for any help you can provide.
-Dave

Matthias Eisner wrote:
> Dan Mondrik wrote:
>
>> Dave:
>>
>> It sounds more like you're talking about a reset of some sort. VISA
>> doesn't provide this.
>>
>> Also, VISA Close is no magical silver bullet here - it merely releases
>> something that VISA Open already accessed. So if you're using VISA
>> for USB with a RAW resource, then you should release it with VISA
>> Close when you're done. But if you're not using VISA in the first
>> place, you can't use VISA to close what it didn't open.
>>
>> Dan Mondrik
>> National Instruments
>
>
> Hello,
>
> for me there si also the problem that I want to reste my USB-Bus. I am
> using two webcams and two USB2Serial (Keyspan) on the bus, where the two
> Converters and one webcam are addressed fr
om within labview. From time
> to time one of the cameras seems to hang and this hangs the whole Bus
> and afterwards the application then, so a USB-Reset would help a lot if
> the commands timeout. Actually reconnecting the Devices does the job as
> well, but I don't want to sit in front of my equitpent all night to see
> if it hangs :-)
>
> Is there any possibility to fix this?
I assume this is only possible by going directly into the Windows kernal
and do some stuff, probably not really politically correct, in there.
Definitely not something VISA or such should be concerned about if one
of the underlying device drivers messes up.
What I assume happens is that the webcam driver and the keyspan driver
at some point compete for the USB bus and hang each other in waiting for
one or the other semaphore. It is definitely a bug in either the webcam
or keyspan driver but how to proof to the manufacturer will be a
difficult exercise. Just try to see if they have newer drivers.
At least
you can hope they found the problem already in the meantime.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Host Controller Location:          Built-in USB
Host Controller Driver:          AppleUSBEHCI
PCI Device ID:          0x1c2d
PCI Revision ID:          0x0005
PCI Vendor ID:          0x8086
Bus Number:          0xfa
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Vendor ID:          0x05ac (Apple Inc.)
Version:           5.16
Serial Number:          CC2BA30DEXDG6LL0
Speed:          Up to 480 Mb/sec
Manufacturer:          Apple Inc.
Location ID:          0xfa200000 / 3
Current Available (mA):          500
Current Required (mA):          500
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Vendor ID:          0x0424 (SMSC)
Version:           b.b3
Speed:          Up to 480 Mb/sec
Location ID:          0xfa100000 / 2
Current Available (mA):          500
Current Required (mA):          2
BRCM2070 Hub:
Product ID:          0x4500
Vendor ID:          0x0a5c (Broadcom Corp.)
Version:           1.00
Speed:          Up to 12 Mb/sec
Manufacturer:          Apple Inc.
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Current Available (mA):          500
Current Required (mA):          94
Bluetooth USB Host Controller:
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Vendor ID:          0x05ac (Apple Inc.)
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Manufacturer:          Apple Inc.
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Vendor ID:          0x05ac (Apple Inc.)
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Manufacturer:          Apple Inc.
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Current Available (mA):          500
Current Required (mA):          40
USB Hi-Speed Bus:
Host Controller Location:          Built-in USB
Host Controller Driver:          AppleUSBEHCI
PCI Device ID:          0x1c26
PCI Revision ID:          0x0005
PCI Vendor ID:          0x8086
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Product ID:          0x2513
Vendor ID:          0x0424 (SMSC)
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Thunderbolt Information:
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          com.squirrels.airparrot.framebuffer          (3)
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