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In my current project, I'm working with an IPC (Industrial Windows 7 Ultimate PC), and 1 or more Hall sensors. These probes measure the magnetic field strength of a newly produced magnet, and return the value (Tesla) in a string.
This setup works with an self written c# application, using the manufacturer's library and a Profinet library, to send the results to a PLC.
Recently, one of the two probes no longer connects. I’ve received a Windows notification that the connected USB device is no longer recognized. Device Manager shows one of the probes, which originally appeared as an HID device, is now an unknown USB device.
After more investigation I found the device now is recognized only when on one certain port. All other ports result in an unknown device. However, I can move the other probe into every port I wish, and it works. Also on my laptop, the affected certain probe works on every port.
I was in contact with the manufacturer of the probe and they told me that they never had issues like this before. I also connected the IPC to Internet, and installed all updates.
Microsoft recommends uninstalling the driver and rebooting the system, but this doesn’t solve my issue.
Belekz
Posted 2018-10-30T13:07:19.917
Reputation: 11
1Probably a connector issue on the original PC; one USB port connector could be out of spec. What happens if you put a port expander on the good port and run both probes through it? – K7AAY – 2018-10-30T17:02:01.443