about digital signal trigger and dynamically change the output voltage

[PKIM]

Hi all,

  I am wondering it is possible to implement something like the following with DAQmx. I would like to continously output analog samples of contstant value,says 3.2volts, at a given update rate until a TTL high detected in one digital line and then output another 512 analog samples (given by an array) so to end the whole process. I am using PCI6711 and seems it doesn't have static output. I have 3 questions

1) how to output a constant samples at given rate continously until it is told to stop?

2) how to change the outputing samples dynamically?

3) If I want to trigger the analog output by digital signal. Should I use counter or PFI? I read the CVI example, it use PFI but many posts use counter. So what's the different? Any do I have to physically connect the external TTL trigger to the PFI?

[Daniel-E]

Hey PKIM,

You might want to post this over in the Multifunction DAQ board; I think more of the forum users who are knowledgeable in DAQmx will be on that board and better able to assist you with these questions.