Here's one way to get just the numbers out, which you can then do whatever you want with, including writing to a csv file (using, e.g., writematrix):
% open, read, and close the file:
fid = fopen('loadcell_data.txt');
data = fread(fid,'*char').';
fclose(fid);
% split the text on '==' and 'Nm':
data = split(data,{'==' 'Nm'});
% remove empty element after final 'Nm':
if isempty(data{end})
data(end) = [];
end
% reshape to four columns:
data = reshape(data,4,[]).';
% now the second column of 'data' contains the first four
% columns of numbers in the file, and that still needs
% to be split on 'N' (couldn't do it before because 'Nm'
% also contains 'N').
% split the second column on 'N', combine with columns
% 3 and 4, and convert everything to double:
data = str2double([split(data(:,2),'N') data(:,[3 4])])
