How do I trigger a DAQ session with a external digital signal (voltage)?

9 次查看（过去 30 天）
Eric Dauenhauer
Eric Dauenhauer 2021-3-5
回答： Nagasai Bharat 2021-3-12
I've been trying to compose a script to acquire data via an NI device (cDAQ2Mod1) when another device (cDAQ1Mod1) receives an external digital trigger. I've been modeling my code off of various examples from MATLAB Help and here is what I have so far:
daqDuration = 3;
daq1 = daq('ni');
daq2 = daq('ni');
addinput(daq1,'cDAQ1Mod1','port0/line0','Digital');
addinput(daq2,'cDAQ2Mod1','ai0','Voltage');
addtrigger(daq1,'Digital','StartTrigger','cDAQ1Mod1/PFI0','External');
addtrigger(daq2,'Digital','StartTrigger','External','cDAQ1Mod1/PFI0');
start(daq2, 'Duration', daqDuration)
while ~daq2.WaitingForDigitalTrigger
pause(0.1)
end
start(daq1, 'Duration', daqDuration)
% Wait until data acquisition is complete
while daq1.Running || daq2.Running
pause(1)
end
When I run the script, I receive an error message indicating:
No channels configured for 'cDAQ1Mod1'. Add channels before adding clocks or triggers.
The error references the line with the first "addtrigger" step.
Any insights? Thank you

请先登录，再回答此问题。

回答（1 个）

Nagasai Bharat
Nagasai Bharat 2021-3-12
Hi,
From my understanding the channel Id for daq1 might not be an appropriate one. I would suggest to go through the Device Info to find out the available channels wrt their Ids.
You could follow this documentation to get knowledge on how you could get the device info.

类别

在 Help Center 和 File Exchange 中查找有关 Simultaneous and Synchronized Operations 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by