Digital and analog generation and acquisition using USB 6251

[sanjeeev]

Hi all,

I have to actually synchronize a USB 6251 and USB 6366 board. I have a vi, which is attached herewith, right now I am able to use the 6366 as the Master and 6251 as the Slave. The master generates a digital trigger pulse( for synchronization of generation and acquisition of signals on both boards), an analog ramp signal, and acquires signals as well. The slave only acquires a set of signals upon trigger.

I want to have the 6251 as the Master and 6366 as the slave. The vi attached does the other way round as I have mentioned above. When I try to use the 6251 as the Master, I get an error asking me to specify the clock source( I made the Hardware and some changes in the program as well; like appropriately exporting the clock from 6251 to 6366).

Thank You

Sanju 

[Jonathan_S1]

Hi Sanju,

The issue here is the difference in capabilities of an X (6366) and M (6251) series board.  The M series cannot directly do a hardware timed digital operation.  You can, however, use an external source as the sample clock for a hardware timed digital operation.  One way to do this is to use an onboard counter on the M series to generate a continuous pulse train and use this as your clock source.  See below.

Hope this helps clear things up.

Jon S

[sanjeeev · Accepted solution]

Thanks for ur reply jonathon,

But in your code below, I coudnt get the PCI-6251/ctrl0 Internal Outpput.....

but I hardwaired the counter o/p ( PFI 12 )....and generated a counter signal on that port, i used that as the clock...

thanks

sanju

[Jonathan_S1]

Sanju,

The reason you can't see the "Ctr0InternalOutput" is because you aren't including the advanced terminal.  To do this, right click on the constant and select "I/O Name Filtering".  Then check the "Include Advanced Terminals" box.  You should then be able to select this and no longer need to make an external connection.

Jon