error while interfacing matlab with agilent PNA

Hello everyone,

I am interfacing my laptop with agilent PNA using TCP/IP connection. I am able to successfully link the PNA to the matlab. But, while saving S11 data, it is giving error:-

 Warning: Unsuccessful read: A timeout occurred before the Terminator was reached.

and terminates without getting any data. What is this error means and how can i rectify it..? Matlab script that i am using is below:

clc;
clear all;

% Find a tcpip object.
obj1 = instrfind('Type', 'tcpip', 'RemoteHost', '192.168.173.248', 'RemotePort', 80, 'Tag', '');

% Create the tcpip object if it does not exist
% otherwise use the object that was found.
if isempty(obj1)
    obj1 = tcpip('192.168.173.248', 80);
else
    fclose(obj1);
    obj1 = obj1(1)
end

% Configure instrument object, obj1.
set(obj1, 'InputBufferSize', 20000);
set(obj1, 'Timeout', 300);

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

% Communicating with instrument object, obj1.
opc_comp = query(obj1, 'SYST:PRES; *OPC?', '%s\n' ,'%s');
fprintf(obj1, 'CALC:PAR:SEL "CH1_S11_1"');

% Query selected measurement name
meas = query(obj1, 'CALC:PAR:SEL?', '%s\n' ,'%s');

% Set byte order to swapped (little-endian) format
%fprintf(obj1, 'FORM:BORD SWAP');
fprintf(obj1, 'FORM:BORD NORM');

% Set data type to real 64 bit binary block
fprintf(obj1, 'FORM REAL,64');

% Read S2P data back from PNA. A S2P file will return number of points * 9
% data points back.
fprintf(obj1, 'CALC:DATA:SNP? 2');
[data, count, msg] = binblockread(obj1, 'double');

% Flush the buffer
%clrdevice(obj1);

% Disconnect gpib object.
fclose(obj1);

% Reshape data so it is split into columns
data_r=reshape(data, [(length(data)/9),9]);
data_r=data_r';

% Read frequency data back from returned data
freqs=data_r(1,:);

% This assumes that the return format is in log mag, angle pairs in the S2P
% file
S11mag=data_r(2,:);

plot(freqs,S11mag);
title('S11 mag');
xlabel('Frequency');
ylabel('dB');

% Clean up all objects.

    delete(obj1);

is there any error in the script...? any help or suggestion is requested.

thanx. smriti

[Nisha Satia]

I am also facing problem. Not able to get data using binblickread() Can any one give solution