drive two or more usb camera (same brand and type)

hi ,
I have download NI-IMAQ for USB Camera driver and it work well with one usb camera.
 
But when I connect two usb camera( same brand and type), it always acquiring images from first usb camera.
 
In attached picture,I find that usb camera handle is useless. if you connect one usb camera, you choose index  to 1,2,3,4 or blank, you still can acquire image( first  time run error, second time work well , third time run error...... cycle)
 
if you have some experience on this , please give me some suggestion ,thanks
 
BR
Sonic
 


16.JPG:
http://forums.ni.com/attachments/ni/170/342083/1/16.JPG

Hi Sonic, it seems like there is something wrong with your picture, i can´t look at it.Mike

You can't. See <a href="http://digital.ni.com/public.nsf/allkb/6985219C76DB128C862571DC005CB1CC" target="_blank">here</a>.

hi Mike, sorry, I will attach it&nbsp; when I come back to office.it's?snapshot picture?of&nbsp;&nbsp; snap.vi ( usb dirver sample)

hi tst, &nbsp;I do not need simultaneous acquisitions.my question is : if I have two or more same camera( same brand,same type), how to acquire image from specify one.

Searching is good for the soul. You might wish to try it. How about <a href="http://digital.ni.com/public.nsf/allkb/F936725EE75F1E55862572D6006C9276" target="_blank">this</a>&nbsp;(which took about 40 seconds to find)?

hi tst,
thanks . I try 2 type usb camera and it work well.
it seems I need to buy so many different usb camera. I need use four usb camera in my test system.

Hi Sonic,
can you see both cameras in the "explorer" or in another program with different names. Can you use your cameras independently in another program?
Mike