USB Com Port doesn't work until device is physically dosconnected and reconnected after each reboot - Win7

Posted on 2011-10-04
Last Modified: 2012-08-13
I have a Motorola LS2208 scanner with a USB interface.  I have the scanner installed and have version 1.8.5 of the Symbol COM Port Emulation Driver installed and the device does what its supposed to do. I scan barcodes direct into hyper terminal.  The problem I have is that when I reboot the PC the device doesn't work until I unplug the scanner and reconnect it again.  Before I reboot and when the scanner is working in device manager under HID I have Symbol USB Com Port Emulation and Communication Virtual Port Com4.  When I reboot I stll see the Com POrt Emulation device but loose the Communication Virtual Port and have instead an unknown device.  The properties for the unknown device say the device is working correctly but hyperterminal doesn't see the port.  When I unplug and reconnect it works straight away.

After doing some googling I have found release notes for a version 1.8.6 of the emulation driver which states that 1.8.6 includes Windows 7 support but I can't find a download link for 1.8.6 anywhere.  I therefore am assuming 1.8.5 isn't 100% happy running on Win7.

I know the 1.8.5 driver does work on Windows 7 because I have a second PC with it working.  I have tried everything including swapping scanners and even doing a clean Windows install but am having no luck with it.

Any ideas?
Question by:bridgegael
    LVL 27

    Expert Comment

    Have you updated the chipset, BIOS and or USB drivers for this system? If not, you might want to visit the manufacturers site and see if there are any applicable updates for the pc.
    I would also verify service packs, etc. against the system that is working with the system that is not. (Service Pack 1)

    Author Comment

    I have the latest BIOS and chipset drivers.

    I have found a nasty hack which works:

    c:\devcon\devcon.exe disable "@USB\ROOT_HUB20\4&1D371D5B&0"
    c:\devcon\devcon.exe "@USB\ROOT_HUB20\4&1D371D5B&0"

    I now need to get this to run at logon.  I tried Task Scheduler but nothing happens, I put it into the registry and nothing happens.

    Any ideas

    LVL 27

    Expert Comment

    I'm not sure which keys you entered the hack into. Did you try the following?


    Accepted Solution

    I had to turn User Access Control off to get this to work.  Not good but it got me out of a hole.

    Author Closing Comment

    Disabling User Access control was the solution.  I suggested it

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