National Instruments & Matlab

Hello, I have using NI 9401, NI9237, and NI9215. When I run the code below,

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

clear

clc

devices = daq.getDevices

s = daq.createSession('ni')

s.DurationInSeconds = 10;

s.Rate=2000;

addAnalogInputChannel(s,'cDAQ1Mod2','ai0','Bridge')

addAnalogInputChannel(s,'cDAQ1Mod3','ai0','Voltage')

addCounterInputChannel(s,'cDAQ1Mod1','ctr0','PulseWidth')

addClockConnection(s,'cDAQ1Mod1/PFI1','External','ScanClock')

ch1=s.Channels(1)

set(ch1)

ch1.BridgeMode= 'Half'

ch1.NominalBridgeResistance = 350;

[data,time] = s.startForeground;

release(s)

plot(time,data(:,1))

title('Bridge')

figure(2)

plot(time,data(:,2))

title('Voltage')

figure(3)

plot(time,data(:,3))

title('Frequency')

figure(4)

plot(time,data(:,4))

title('PulseWidth')

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

I keep getting this error

NI Error -200414:

Requested sample clock source is invalid.

Property: DAQmx_SampClk_Src

Corresponding Value: Default

Device: cDAQ1

Task Name: _unnamedTask<79>

Status Code: -200414

Can anyone explain why I am getting this error?

Answer 1

[Brian Hu]

It seems that you might have the ordering of your inputs slightly mixed up when you call the addClockConnection function. Here is a link to an example that might be helpful for resolving this issue.

https://www.mathworks.com/help/daq/ref/addclockconnection.html#btdmusy