2 channel voltage list analog output 6014

[annapurna]

I'm attempting to use DAQ assistant to output two voltage lists simultaneously on two analog outputs where the list progression occurs on an external trigger.  The process seems to work fine except that I have to give the board a preliminary trigger (which it seems to ignore)  so that on the second trigger that I send it it writes out the first element in the voltage lists.  In DAQ assistant I've been using external triggering on PFI1 and external clocking on the same channel.  How can I get rid of the pretrigger requirement? 

I've also tried not using external triggering and just using the external clock feature.  This behavior is slightly different in that the board now reacts to the first trigger, setting the analog outputs to the first voltage level in the list, but now the board requires an extra trigger at the end of the voltage list (which corresponds to no voltage output change) to return the "I'm done" message back to Labview.  Without the extra post trigger I get timeout problems. 

So I must be doing something dense, what are the correct settings for DAQ assistant to write out two voltage lists using an external trigger to change the output state?  Thanks.

[Chris_D]

Hey annapurna,

From what I understand you are doing a HW Timed 1 Sample Analog Output generation, have configured a Start Trigger on PFI1, and have configured an External Sample Clock on PFI1. You should be able to get rid of the pretrigger requirement by not setting the Start Trigger. Setting the Start Trigger to PFI1 means that the device will wait for a rising edge on PFI1 before it begins the generation.

Also, you will have one rising edge for each voltage each in the list. If you are receiving a timeout error this means that the device is expecting a trigger and is never receiving it. I am assuming you are doing this in a loop so you may be iterating one too many times in the loop. Do you mind posting a screenshot of your block diagram?