Visa usb bulk communication - multiple end points

Hi All,
I'm setting up an ocean optics USB2000+ spectrometer and would like to use visa instead of the dll I got with the spectrometer (I had a bunch of stability problems, its not supported anymore by ocean optics and I don't want to have to pay for the new version). I have the documentation for the spectrometer and have been able to set the integration time and receive spectra as quickly as the dll was able to. But I have not been able to read the calibration information from the spectrometer. All commands use bulk transfer, so I'm using visa write and read to send/receive. I think the difference between the spectral data and calibration data is that the data comes from different endpoints. The spectrometer has 4 endpoint addresses (3 to the PC = IN, 1 from the PC = OUT). The spectral data comes back on the first IN endpoint and the calibration data comes back on the 3rd IN.
Is there a setting I need to change to read from a different endpoint? They are all bulk type according to the documentation. Any suggestions would be much appreciated.
thanks!
Solved!
Go to Solution.

Hey gharris,
It looks like there is a setting you can change through a property node that will change which endpoint you read from. If you're using a text-based program, the property you need to change is VI_ATTR_USB_BULK_IN_PIPE. If you're using LabVIEW, follow these steps :
First, set a VISA property node down on your block diagram (really any property node will work). Next, right-click on the property node and select Select Class -> VISA -> I/O Session -> USB Raw. This step can be found in EndpointSS1.png attached below, and will change the property node to a USB Raw property node. Third, left-click on Property and select USB Settings -> Bulk-In Pipe. This step can be found in EndpointSS2.png, attached below. This is the property that sets which endpoint to read from. To change the value of this, right-click on the property node and select Change all to Write, which will allow you to wire in an endpoint value.
Justin E
National Instruments R&D
Attachments:
EndpointSS1.PNG ‏24 KB
EndpointSS2.PNG ‏15 KB

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