As I'm sure you are aware It is only possible to output all AO channels at the same update rate as there is only one AO timing engine. Therefore all of your channels will be updated at the same rate. Now to do this it is actually pretty easy, simply:
1.create an AO task and wire in multiple Channels using a string similar to the following: Cdaq2Mod3/AO0:5.
2.Configure your sample clock to whatever update rate you need.
3. Specify any triggers you may need.
4. You then may need to write some data into the buffer (even if its empty data to ensure that once the task is start there are values in the DAQmx buffer to be written to the card.
5. Start the task
6. Open a While loop and inside the while loop build the data of each channel separately (however you need it to be for each channel).
7. Use the Merge signals.vi Express VI to build the array of data thatwill be passed to the DAQmx REad.vi.
8. Pass the output of the Merge Signals.vi toa DAQmx Read (Configured for AO >> Multiple Channels>> Multiple Samples)
9. Clear the task after the while loop and handle any errors.
Please see the following discussion forum for more details as well as images/an example programs for how to do this.
Charley Dahan
Global Account Manager
