Subvi randomly does not work

Hello world

I feel very odd behavior of LabView and hope you could help us. I use a DLL to connect to, in writing, reads in and finally to disconnect a USB HID device.

First step: init, sending a KeepAlive message, works very well (99% of the time)

second step: getVer, ask to get the version of the device. There lies the problem. My SubVis reading and writing are the same in the two routines. In any case, in the GetVer routine, sometimes the writing part does not work. The DLL called tell me, 64 (the input buffer size) bytes written and returns a success message. Problem, it is nothing really has been written to the device. (I have another program to check the flow of the DEVICE to the pc and there is no answer / the Subvi waits for the input of the unit and there is none).

Someone at - it already had a problem like this, where date does not have to be transported correctly? (Sometimes it works without any problems, I don't know how that could be possible.)

If I have missed out on anything whatsoever, tell me please, thanks in advance...

Kind regards

Pedro


Tags: NI Software

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