set term png size 1000,1000
set output "plotdata.png"
set title "discharging test"

set xlabel "Time"
set ylabel "ADC"

# set xdata time
# set format x "%H:%M"

# set xtics "1000" rotate by -90
unset xtics
set x2tics

set grid ytics

set label "01:10:11 231" at 8000, 231 point pt 7 offset char 1,1
set label "03:12:50 255" at 9544, 255 point pt 7 offset char 1,1

plot "data" using 2:xticlabels(1) with lines