multiple usb daq Daqpad 6015

[zxcc]

Hello there.
I am trying to log about 20 channels  simultanously  and I have two USB DAQpad 6015  with 16 Single ended channels each.

I try to create a task, but MAX cannot create tasks from 2 different DEVS.

I tryed calling physical channels in labview, but gives me errors.

I read here that  it is possible to do with the cheap 600x so does anyone know if these other ones can do it?
If yes How can you control the timing whithout a RTSI.

Thanks

[Sarah_Coleman_NIUK]

Hi,

It isn't possible to synchronise two devices internally over USB. If you want to synchronise AI channels on two seperate devices you'll have to use the same clock for each one.

You should be able to export the sample clock from the 6015 and use that signal to clock both AI tasks. I'm not sure if you can export the sample clock on thoses devices though... try it out and if you can't just generate a clock signal on one of the counters and use that signal to clock both tasks.

Let me know if you need more info on how to do this and i'll try and put some code together for you.

Regards,

[zxcc]

Hello Sarah.

Some code would really be appreciated, as I can't get them to work at the same time, in the same VI.

Thanks

ZX

[Sarah_Coleman_NIUK]

Hi Zx,

Try having a look at some of the shipping examples. If you go to Help >> Find examples. When the NI Example Finder opens browse to Hardware Input and Output >> DAQmx >> Synchronisation >> Multi Device.

You want to export the clock from one of the devices to a PFI line, connect that line to a PFI line on the other device, then define that PFI line as the source of the clock for that device.

I'm a bit busy at the moment or I'd put some example code together for you but once you've had a look at the examples, if you're still having problems let me know and I'll look into it further for you.

Best regards,

[Javo]

Hello there,

I am trying to synchronise two devices Daq Pad 6015. In NI E xamples Finder /Hardware input and output>>DAQmx>>Synchronization>>MultiDevice there are not any examples for this device.

Sarah, could you put some example code of synchronization of two Daq Pad 6015. I am using the PFI lines of the two devices, but I can´t obtain the synchronization.

Thanks.

Javo

[gt3000]

Hello Javo,

This thread is over 4 years old.  Please post a new thread.  This will ensure that all members of the community can see it and can help you.  In this new thread describe your exact hardware set up and Pins you have used to access the PFI lines.  Any code you have written so far would also be helpful.

Sarah is not longer available to post on this forum. 

Regards,