Creating Labview software for Multiple USB 6009's

[VirtualPhill]

Hi All

I have 3 USB 6009 DAQ's all being used for diffrent testing applications.  I currently have the problem that I want to change the Labview code for one of the applications but test it using a different USB 6009.  Labview does not allow for this though (that I can see) the USB cards all have a unique name on the PC (default dev1,dev2 and dev3).  Is there a easy way to get around this problem?

Hope someone can help

Phill

[devchander]

Have you kept your device name/Physical channel input as a constant on block diagram??

If yes, make it a control and choose the device whose channels you want to acquire from before you run the vi

Also, You can keep seperate acquisition loops for all your 3 devices on the same vi and assign one device's channels to each acq loop.

I not really understand what exactly you are trying to express. Could you be a bit more clear, so that we could suggest better?

[VirtualPhill]

I have used the DAQ assistant to create the inputs which does not give the ability to select the device name?  I have got around the problem by changing the device name using the Measurements and Automation explorer.  It is not really a solution but as I have the only PC with more than one device installed it should not cause a problem! 

[devchander]

Try exploring the possibility of using using DAQmx functions to build an acquisition vi.

Or you could start off by using example vi's shipped with LabVIEW.

Find Examples>>Hardware input output>>DAQmx>>Analog Measurements>>Voltage Folder

The advantage of using these vi's is that you do not have to create a task or a DAQmx task/ Global channel in MAX. You can configure the channels from the device that you want to acquire in the program itself.

Note: you cannot acquire from two devices in one task, but will need to have a seperate task for each device.

[50ohmTerminator]

Hi VirtualPhill

I would agree with devchander here. It would be a good idea to explore the voltage measurement examples that ship with LabVIEW. You can open the Example Finder from Help >> Find Examples. The Cont Acq&Graph voltage-Int Clk.vi example will give you a good idea on how to write DAQmx code. In this example you will able to select the device you want to acquire from.

Have a good one.

Malay D
NI

[VirtualPhill]

Hi

This does give the ability to change the Device but I do not want to give the end user the choice of changing the input as well.  Is there a way that the device/input can be split into device and input seperatly? This way I can fix the inputs and select any of my devices?

Cheers for the replys

[devchander]

---

Is there a way that the device/input can be split into device and input seperatly? This way I can fix the inputs and select any of my devices?

That should not be a problem.

Just think of a logic to create physical channels by appending Device name and channel names using 'concatenate string' function to create a list of physical channels.

( Look at the pic attached )

In this, keep the 'channel names' as a constant on your block diagram and keep changing the device name.

Hope this helps,

Regards

Dev