Data Acquisition start(): NumScans argument ignored

9 次查看（过去 30 天）
Joshua Walker
Joshua Walker 2021-1-27
回答： Srishti Sahni 2022-5-18
I have a function that is called during my program that looks like the following:
function outputSingle(obj, magnitude)
stop(obj.dataAq);
flush(obj.dataAq);
preload(obj.dataAq, Write.getData(magnitude, obj));
start(obj.dataAq, "NumScans", 1);
end
start() in it gives the following message: "Warning: NumScans argument ignored."
The output is started earlier in another function with:
start(obj.dataAq, "RepeatOutput");
But as you can see in the first code section it is stopped and flushed.
I have confirmed that the output signal is being repeated when NumScans is ignored.
Can anyone answer why NumScans is being ignored, and how to fix this?

请先登录，再回答此问题。

回答（1 个）

Srishti Sahni
Srishti Sahni 2022-5-18
I understand that the ignored argument, "NumScans" for the start() function is a cause of concern for you.
The function start(d,"NumScans",span) starts the background input acquisition to run for a finite span of time, specified as a number of scans. If the DataAcquisition has any output channels, the start occurs but the duration specification is ignored.
If you want to avoid this behaviour, please examine the output channels within DataAcquisition.
More details about the start() function and this behavior can be found on the following link: Start DataAcquisition background operation - MATLAB start (mathworks.com)

类别

在 Help Center 和 File Exchange 中查找有关 Startup and Shutdown 的更多信息

标签

产品


版本

R2020b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by