Hello NI Experts,
I am using PCI-6010 DAQ Device in order to acquire and generate signals from/to a pneumatic system. I am using channels that are following;
AI9 : First Pressure Sensor Input
AI10 : Second Pressure Sensor Input
CTR0 : Sony SJ300 Scale Unit / A signal for position (Edge-Count)
CTR1 : Sony SJ300 Scale Unit / B signal for position (Edge-Count)
AO0 : First Valve Analog Output
AO1 : Second Valve Analog Output
I am also using MatLab for accessing the device, and I am using the code following,
clear
clc
close all
UpB=4;
Ts=0.05;
s=daq.createSession('ni');
s.DurationInSeconds=UpB;
s.addAnalogInputChannel('Dev1',9,'Voltage');
s.addAnalogInputChannel('Dev1',10,'Voltage');
s.addCounterInputChannel('Dev1','ctr0', 'EdgeCount');
s.addCounterInputChannel('Dev1','ctr1', 'EdgeCount');
s.addAnalogOutputChannel('Dev1',0,'Voltage');
s.addAnalogOutputChannel('Dev1',1,'Voltage');
I want to launch the session for UpB (4) seconds with respect to Ts (0.05) sampling time.I am getting the following error if I run these codes.
Warning: A channel that does not support clocked sampling was added to the
session. Clocked operations using startForeground and startBackground will be
disabled. Only on-demand operations using inputSingleScan and outputSingleScan
can be done.
I know it occurred because of the analog outputs. In order to get over this problem, I am using a timer function to send and acquire signals conditionally to a specific sample rate.
t = timer('TimerFcn', 'stat=false; disp(''Finish'')',...
'StartDelay',UpB);
start(t)
stat=true;
i=1;
while(stat==true)
dataAcquired(i,:)=s.inputSingleScan();
P1(i,1)=dataAcquired(i,1);
P2(i,1)=dataAcquired(i,2);
x(i,1)=dataAcquired(i,3)-dataAcquired(i,4);
pause(Ts)
i=i+1;
end
But instead of having 80 samples, I can only read data for 64 samples. This means that my timer works for 3.2 seconds instead of 4 seconds.
What is the problem, any ideas? Cannot I use external clock of the PCI-6010 if I want to send signals to my system?
I tried using two sessions and assign analog outputs one of them, but nothing changed, I think I still have to create a timer function to send signals with a sample rate.
By the way PCI-6010 is not supported from Real-Time Windows Target, I cannot use it neither.
Thanks in advance.
