LabVIEW exe. with 2 USB Daq devices

Hello All,
I am trying to build a LabVIEW exe. with two USB 6210 data aquistion modules plugged into a USB hub installed inside a 19" rack. I used the DAQ Assistant to generate the LabVIEW code for the aquisition and it works fine. However, when I disconnect the USB cable from the development machine and reconnect later, my I/O are mapped to the wrong modules. Is there a way to map my channel names to the actual module, maybe in MAX, and just include the Max configuration file in my exe? Can I use the DAQ assistant, or do I configure the physical channel names and create my own tasks in MAX and not use the DAQ Assistant?
Any help would be appreciated.
Thanks

Hi Botman,
Unfortunately you are in a unique situation in that you have 2 of the same type device that are removed from the system and reconnected to the system at the same time. However, it is probably not guaranteed that one device will be detected before another consistently. Given your situation I would recommend that you set up your application to programmatically discover the devices in your system. There is an example program here that demonstrates how to do this. In your case I think detecting by serial number would be ideal. All you would need to do is include the LLB file in your project to ensure that all of the necessary VIs are included.
Keep in mind that this will require some modification of your code. You will need to use the lower-level DAQmx functions rather than the DAQ Assistant (which basically serves as a wrapper around the lower-level functions). In the end, adding the VI from the example program above and using lower-level DAQmx functions will make your code more robust because distributing the executable to another system (or even using it on the development system) will not require the user to interface with MAX at all. Let me know if you have any other questions.
Regards,
Andrew W
National Instruments

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LabVIEW exe. with 2 USB Daq devices

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