PNSU? command on Lecroy oscilloscope using GPIB

Good afernoon,

I am trying to settup a GPIB communication with a Lecroy oscilloscope using the Instrument control toolbox.

I managed to open the GPIB connection, to send basic commands and to receive some data. However a specific command can't seem to work on Matlab (I've had it work with an Excel macro). This command is used to configure recall a previously saved configuration, I would have to send the command in config.txt.

Here is my code :

%% Instrument Connection

% Find a GPIB object.
obj1 = instrfind('Type', 'gpib', 'BoardIndex', 0, 'PrimaryAddress', 6, 'Tag', '');

% Create the GPIB object if it does not exist
% otherwise use the object that was found.
if isempty(obj1)
    obj1 = gpib('NI', 0, 6);
else
    fclose(obj1);
    obj1 = obj1(1);
end

% GPIB configuration
obj1.timeout = 0.1; %is 10s by default
obj1.OutputBufferSize = 75000; %Set buffer size to 75000 so that we can send a config

% Connect to instrument object, obj1.
fopen(obj1);
clrdevice(obj1);
flushinput(obj1);

%% Save conf
fprintf(obj1, 'PANEL_SETUP?'); %Ask oscilloscope for its setup. (sends back the command in config.txt)

data_temp = 1; %data_temp init
i=1;
while (~isempty(data_temp)) %multiple 512 bytes reads
    data_temp = fscanf(obj1);
    if ~isempty(data_temp)
    data{i} = data_temp;
    end
    i=i+1;
end

data_comp = cell2mat(data);

disp(['length data comp = ', num2str(length(data_comp))]);

%% Saves data_comp in config.txt
fileID = fopen('config.txt','w');
fprintf(fileID,data_comp);
fclose(fileID);

% Sends conf to oscilloscope
A=obj1.ValuesSent;
fprintf(obj1, data_comp);
disp(['number of bytes sent = ', num2str(obj1.ValuesSent-A)]);

The console returns:

length data comp = 70427
number of bytes sent = 67751

And the oscilloscope displays an error message "error: command <PNSU> at token <PNSU>: end of block of data found before byte count exhausted"

I think that the issue is that the oscilloscope is expecting 70427 butes but only receives 67751 bytes because all CR are considered as terminator!

I have tried changing the EOSCharCode and EOIMode without success. Changing the terminator (EOSCharCode) doesn't change anything and disabling EOIMode just makes the oscilloscope not react at all.

I have also monitored the GPIB transmission using "NI SPY" and noticed that the last 'f' isn't sent! weird

Would anyone have any recommendation? I'm running out of ideas.

[Malte Rodeheger]

I'm encountering the same problem. Did you find any solution to this porblem? That would really help me.