In the Analog Output Generator Toolbox, how do I trigger the analog output with a external digital signal ?

7 次查看（过去 30 天）

Wang Yifan 2022-2-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1655745-in-the-analog-output-generator-toolbox-how-do-i-trigger-the-analog-output-with-a-external-digital-s

编辑： Sakari Vekki 2022-9-7

Hi,

I use the NI-USB 6211 to output a DC voltage signal in ao channel which is triggered by an external TTL signal, imported by PFI0.

I use the function addtrigger to enable the external trigger mode. However, the external trigger signal cannot trig the output. I wonder how to config it ?

The codes are listed below:

d = daq("ni");      
addoutput(d,"Dev1","ao0","Voltage"); 
addtrigger(d, "Digital", "StartTrigger", "External", "Dev1/PFI0");
write(d,OutputVol); % OutputVol is the Output DC Voltage

Additionally, I tried another way to realize the triggering the output, the codes are :

s=daq.createSession('ni'); 
ch=s.addAnalogOutputChannel('Dev1',0,'Voltage'); 
s.addTriggerConnection('External','Dev1/PFI0','StartTrigger')
output=1; % for example
s.queueOutputData(output);
s.startForeground();

It is effective, but the speed, executing from Line 4 to Line 6, is much slower than the method using the first method. How to accelerate it? And what is the difference between the two methods?

Thanks a lot.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Sakari Vekki 2022-9-7

编辑：Sakari Vekki 2022-9-7

在 MATLAB Online 中打开

I had similar issues trying to trigger output signal with external trigger (using NI-USB 6216). Code below seems to do the trick in my matlab app.

                    app.speedOutput =daq("ni");
                    addoutput(app.speedOutput,"Dev1","ao0","Voltage");
        % %         With this configuration writing Dev1/PFI0 high will output preloaded data
                    addtrigger(app.speedOutput,"Digital","StartTrigger","External","Dev1/PFI0");
        
        
        
        %%         Preload output values
                    preload(app.speedOutput,output);
                    start(app.speedOutput);
        %%         app.speedOutput will wait for PFI0 to go high before writing preloaded values