how to get trace with matlab from E4407B from series ESA

im trying to plot trace from E4407B with GPIB connection, without download the trace file.

and i have problems with get the trace from the instrument with binblockread.

if you can explain me how to use the binblock read becouse, i didnt understand well from the matlab doc.

here is my code:

{ vendor = 'agilent';

scrname = 'GPIB0::18::INSTR';

E4407BIn = visa(vendor, scrname);

interface = E4407BIn,'interface';

fopen(E4407BIn);

fprintf(E4407BIn,':FORMat:TRACe:DATA');

y = query(E4407BIn,':SENSe:SWEep:POINts?')

fprintf(E4407BIn,':OUTPut[:STATe] ON');

query_string = sprintf(':TRACE:DATA? TRACE%1d',1);

fprintf(E4407BIn,query_string);

data = binblockread(E4407BIn,'float')

fclose(E4407BIn);

z = str2num(y);

plot(1:z,data); }

thanks for helping

[Maxime Malnou]

Hi,

I could get it to work with the following code:

global SpecA;

if(strcmp(SpecA.Status,'closed'))

    fopen(SpecA);

end

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% fwrite(SpecA,'*CLS'); % clear device

fwrite(SpecA,'*OPC'); % clear register

fwrite(SpecA,':FREQ:STAR?'); % gets start frequency

startf = fscanf(SpecA,'%f');

fwrite(SpecA,':FREQ:STOP?'); % gets stop frequency

stopf = fscanf(SpecA,'%f');

fwrite(SpecA,':SENSE:SWEEP:POINTS?'); % gets number of points

npoints = fscanf(SpecA,'%f');

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

data = zeros(npoints,1);

% Get the trace data

fprintf(SpecA,':INIT:IMM;*WAI'); % start a sweep and waits until it completes

fprintf(SpecA,':TRAC? TRACE1'); % sends a trace into the device buffer

for i = 1:npoints

data(i) = str2double(char(fread( SpecA, 12, 'char')));

char(fread( SpecA, 1, 'char'));

end