Query Instrument - non-numeric value

2023 6 29
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更新时间：2023 7 4
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Hi,
i'm writing data of voltage and current to an instrument with scpi commands and it works fine. Now i'm trying to print the meassured data at the power supply controller via a 'query instrument'-block to a display, but receiving the error Response from instrument was non-numeric.
These are my configurations:
Is it possible to handle the response from the instrument with the 'query instrument' block?
Or is it possible to insert MATLAB-Code to my simulink model? Because with matlab code i received the meassured data, but i dont want to do it all by script, but with the simulink model.
THANKS IN ADVANCE!

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Harald
Harald 2023-6-30

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Hi Tobias,
to answer the final part: you can use the MATLAB Function block to incorporate MATLAB code into Simulink models.
Best wishes,
Harald

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Tobias Kammler
Tobias Kammler 2023-6-30
编辑：Tobias Kammler 2023-6-30
So, the MATLAB-Code i used to read back and print the voltage is:
fprintf(serialObject,'MEasure:VOltage?');
V = fscanf(serialObject);
disp(V);
If i put this in a function block, the SCPI-command 'MEasure:VOltage?' has to be the input for the matlab function or do i use the function block without input, just the output "U"?
My idea for the code inside the block is
function Voltage = U
fprintf(serialObject,'MEasure:VOltage?');
V = fscanf(serialObject);
U = disp(V);
and this should print the meassured voltage every time step?!
Harald
Harald 2023-6-30
I would rather use
function U = Voltage
fprintf(serialObject,'MEasure:VOltage?');
U= fscanf(serialObject);
serialObject will need to be a parameter. You can set these using the "Edit Data" menu in the top left.
Best wishes,
Harald
Tobias Kammler
Tobias Kammler 2023-7-4
unfortunately this doesnt work. i get the following error:
The 'serial' class does not support code generation.
Function 'MATLAB Function' (#24.59.77), line 5, column 16:
"serial(serialPort)"
i also tried to generate to generate the serial object, like i did before with pure matlab code outside the simulink model
serialPort = 'COM4';
serialObject = serial(serialPort);
do you have an other idea to solve the query fromm the instrument from simulink?
Harald
Harald 2023-7-4
Hi Tobias,
you need to declare all functions that are not supported for code generation but used in a MATLAB Function block as extrinsic, so e.g. also
coder.extrinsic('serial')
Keep in mind that this would open a new connection every time the block is executed. This may not be desirable.
Thus, I prefer the other approach of creating the connection in MATLAB. What problems did you run into when you tried this?
Best wishes,
Harald

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