02-25-2020 08:12 PM
Hi everyone:
I want to use 2 USB 6289 to collect 30 chanel differential AI signal.
but due to one USB 6289 only has 16 AI channel. so that I must use 2 USB 6289 to acheive this application.
how do I know these 2 USB 6289 device delay time??
do you have this kind of experience before
br
vincent
Solved! Go to Solution.
02-25-2020 09:46 PM
What do you mean by "device delay time?"
In general, I'd try to approach sync between different devices by sharing a sample clock. Let device A be the master that exports its sample clock out to a PFI pin. Device B will be the slave that imports its sample clock from a PFI pin.
You'll need to physically wire this sample clock signal between the two devices' respective PFI pins. It'll probably be a good idea to run a physical wire beween their DGND pins too.
Then in your programming be sure to start the master task *last*. That ought to do it.
-Kevin P
03-04-2020 06:34 PM
Hi Kevin_P:
thanks for your response.
In my case, we have 2 USB 6289 then you suggest to use wire to connect device A PFI 0 and device B PFI 0.
Is it correct??
br
vincent
03-04-2020 09:05 PM
Yes. Then you'll also need to do the appropriate configuration in the tasks to export the signal from the "master" device/task to its PFI0 pin and then configure the "slave" device/task to get its sample clock signal from its own PFI0 pin.
Here's an idea of what some of that config might look like:
- Kevin P
03-04-2020 09:25 PM
thx Kevin