Problem reading analog data from DT9816 with Data Acquisition Toolbox Functions

I have a problem reading data from the AD conversor DT9816.

I'm using "read(d,numscans)" function from Data Acquisition to capture analog chanel voltage. The main problem is that with single capture, it works. But, when I try to capture more measurements (more than 1 numscan) it shows the following error:

"Property assignment is not allowed when the object is empty. Use subscripted assignment to create an array element."

I tried o asign with index as a vector, but neither worked. I attach the code. Lines that do not work are commented onthe code.

I'm using 2021a and I read somewhere that maybe has legacy problems, as DT9816 is kind of old.

[chrisw23]

check this

DAQ acquire data

DAQ read method arguments

As an alternative install the NI driver and use the interactive NIMAX tools to create an analog in task to check out the device properties/options.

DAQmx driver by NI

[Martin]

I've already checked those help pages. In fact, I wrote my code from the examples of these pages. I cannot do it with "NI" driver, as I have a "DT" hardware. Matlab detects correctly my "DT" hardware (devs=daqlist):

and it will not work with NI because this is not an NI conversor:

It's like if there was a problem with read function when I try more than 1 scan. I've read in other questions that more people have the same problem with DT9816 or similar (old hardware) and new Matlab versions (2019 or higher).

[chrisw23]

Ah sry I didn't realized that vendor.

MCCDAQ Driver/API

They provide Win10/11 driver that should be .net compatible and easy to import.

MCCDaq CD download

After the installation off the universal driver, it will be accessible via the GAC

C:\WINDOWS\assembly\GAC_MSIL\MccDaq\<version>\MccDaq.dll

asm = NET.addAssembly("MccDaq")

myDaq1 = MccDaq.MccBoard(0); % index 0 assumes that the first device is the DT9816s

..as a starting point

[Martin]

Sorry to tell you that my problem is not related with the Driver or hardware I'm using. Hardware is detected perfectly by Matlab. Look.

My problem is using the read function. It's like Matlab cannot create the output vector of the function. When I try to read just 1 data, it works: data=read(d,1). But with 2 or more, message is shown:

"Property assignment is not allowed when the object is empty. Use subscripted assignment to create an array element."

I tried to do it with indexes: data(:,:), data(:,1), data(1:numscans,:)... But always the same message error.

I'm using Data Transation hardware, not National Instruments. Despite of this, I installed DAQami MCC and drivers from NI, but no changes occured.