How to stop this script when running

[TimmiA]

Hi Everyone.

Question one:
This is a scheduled script (script name: Ligths_UP), is there at way to enable/disable it by the use of a grp.adress?

e.g:
if start == true then 
script.enable(Ligths_UP)
else
script.disable(Ligths_UP)


Question Two:
When this script is started i can't stop i from running again. 
It will only stop when value_end is reached.
Is there a way to stop it halfway?

value_sek = grp.getvalue('32/1/4')
value_end = grp.getvalue('32/1/3')
start = grp.getvalue('32/1/1')


-- UP
output = '32/1/2'
for i = grp.getvalue(output) + 1, value_end, 1 do
  grp.write(output, i)
  os.sleep(value_sek)
end

Best regards
Timmi Andersen
Denmark