Instrument Control (GPIB, Serial, VISA, IVI)

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USB 232/4 stops communicating

Hello,

 

I have a test system using 2 USB 232/4 modules to communicate with up to 8 devices under test (DUTs). At least once a day, we'll loose communication to 4 devices, which are all connected to one of the two USB 232/4 modules. We end up resetting the PC to get things working again. We are running LV 8.2 and TestStand 3.5. I have a second identical test system running the same software, but my RS232 interface uses 2 "old" NI PCI 4-port cards. This system never experiences any communication failures like the failures we see on the USB 232/4 system. So I can rule out that the software (VIs and test sequence) are the cause of the problem, since they are identical on both systems.

 

I am aware of some MS Windows USB driver issues where the driver will shut down the USB port if there are too many errors/timeouts occurring on this port. I did notice that NI has their own driver for this card (saw this through Windows Device Manager). But I wonder if the NI driver might have "inherited" the Windows USB driver bug.

 

I was wondering if anyone has run into similar problems and come across a fix?

 

Thank you in advance for your time and response.

 

Thank you,

Jim 

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Or has windows powered down the bus.

Check if that can happen. Sometimes nasty to find. 

greetings from the Netherlands
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