GENIUS!
Thanks Neil, it now works perfectly using your code slightly modified:
main:
do
serout c.0,N2400,(255)
serout c.0,N2400,(%100) ;Turn on LED
pause 100
serout c.0,N2400,(254,128,"LED on")
pause 5000
serout c.0,N2400,(255)
serout c.0,N2400,(%000) ;Turn...