Execution timing LV4

Hi I am having problems with execution timing of my main vi.
Details:
Win2000
Labview 4.01
The problem lies in the execution of a for loop and the use of a AI multipoint vi for obtaining 2 waveforms. The analog input and the first structure within the for loop are contained within sub vi's.
When run, the for loop must wait to be executed AFTER the analog input has fully completed. This defeats the entire purpose of what I am trying to do.
The for loop is used to communicate with a serial device using NI-VISA, and all the inputs for the loop are ready prior to the execution of the data aquisition.
any ideas how I can get analog input and the for loop and the data acquisition vi to start simultaneously????
Stuart

I am certain there is no data dependency between the two strucutres. I tried a wait function but it didn't seem to have any effect. I also tried a while loop in place of the for loop. Still no change.
The main vi which call the sub vi's and the sub vi's themselves are attached. They are programmed in LV4.01
Attachments:
SinePW.vi ‏70 KB
mainVI.vi ‏195 KB
DAQ.vi ‏132 KB

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double time;
if (*nextdelay==0) time=2.0;
else if (*nextdelay==1) time=1.0;
else time=12.0;
SetAsyncTimerAttribute(timerId, ASYNC_ATTR_INTERVAL, time);
if (*nextdelay==0)
#pragma omp parallel sections
#pragma omp section
DAQmxWriteDigitalLines(...); // output TTL to one digitla line
#pragma omp section
DAQmxWriteDigitalLines(...); // output TTL to another digitla line
*nextdelay++;
else if (*nextdelay==2)
#pragma omp parallel sections
#pragma omp section
DAQmxWriteDigitalLines(...); // output TTL to one digitla line
#pragma omp section
DAQmxWriteAnalogScalarF64(...); // analog output to one channel
*nextdelay++;
else if (*nextdelay==3)
#pragma omp parallel sections
#pragma omp section
DAQmxWriteDigitalLines(...); // output TTL to one digitla line
#pragma omp section
DAQmxWriteAnalogScalarF64(...); // analog output to one channel
#pragma omp section
DAQmxWriteAnalogScalarF64(...); // analog output to another channel
*nextdelay++;
ResumeAsyncTimerCallbacks();
return 0;
void main(void)
int n = 0;
int timeid;
timeid = NewAsyncTimer(120.0/1000.0, 3, 1, ATCallback, &n);
But it doesn't work. There is no compilation and runtime error but the timing just not right. I wonder do I have to suspend the timer in the callback function when I reset the delay for next call? If I do so, I am worry if it will apply too much delay (since I suspend and resume the timer in the delay) so it will cause even worse timing. But if I don't suspend the timer before I reset the time, what happen if the code running in the callback function not finished before the next callback arrive. It is quite confusing how to use asynchronous timer in this case. Thanks.

Yeah, unfortunately the 6711 doesn't have clocked digital I/O. There are only two counters anyway so even if you could use them to generate your signals you wouldn't have enough (*maybe* something with the 4 AO channels and a counter depending on what your output signals need to look like? The AO channels can output "digital" as well if you write 0V or 5V only).
A PCI DAQ card which does support clocked digital I/O and has 2 analog outputs is the 6221 (or if you could use PCIe the 6321 is a more updated version with two extra counters and some additional functionality).
If there isn't a way to implement clocked outputs afterall, one thing you could do to make your code a little more efficient is to consolidate the writes. You can put your digital lines into a single task and write them at ocne, and you can put your analog channels into a single task and write them at once as well.
I'm not sure about the callback issue, you might find some more help in the CVI forum. I don't think it's going to solve your underlying problem though as ultimately the execution timing of your software calls is at the mercy of your OS.
Best Regards,
John Passiak

Execution timing LV4

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