How can I send variable value with To Instrument Simulink block?

Hello, I am using an external PSU and I would like to set the voltage and current using simulink but I am not able to do it with simulink.

I am using the Instrument Toolbox and the Support Package for Keysight IO Libraries and VISA Interface. For matlab it is straight forward, this is the code

PSU = visadevlist();
vi = visa('agilent',PSU{1,1});

fopen(vi);
fprintf(vi, ':INST CH2'); 
fprintf(vi, ':VOLT 27.3');
fclose(vi);

but with simulink I am not able to send the value of a variable to the PSU. I am using the To Instrument block, and this is my simple simulink diagram,

and those are my properties

Any idea how to do this? I am also open to other alternatives

Answer 1

[ANGEL DEL PINO JIMENEZ]

In case someone from the future finds it useful, I have solved it. The main problem was dealing with Error with simulink: 'The 'visa' class does not support code generation.'

I have done it very easily by using the MATLAB System block and using the Interpreted execution option of it.

And the code, in the stepImpl function:

function stepImpl(obj, voltage)
    % Set up VISA connection
    vi = visa('agilent', "INSTR_ID");
    fopen(vi);
    fprintf(vi, ':INST CH2');
    
    % Set the output voltage
    % fprintf(vi, sprintf(':APPL CH2,%f,%f', voltage, 1.5));
    fprintf(vi, sprintf(':VOLT %f', voltage));
    
    % Close VISA connection
    fclose(vi);
 end