Slightly modified the original program, owondump.c 0.3.
In the Display Set Menu, you need to change the Carry manually to obtain either “owondata.bmp” or “owondata.txt”.
% gcc -o owondump owondump.c -lusb % sudo ./owondump % gnuplot gnuplot> plot 'owondata.txt' using 1 with line, 'owondata.txt' using 2 with line