The problem you have is that everything you need to know is contained within a number of IEC standards:
They aren't cheap.
I've read them all pretty much cover to cover, if you don't want to individually address fittings then you just need to send DALI broadcast commands, basically you just need to find out how to send an ARCPOWER command to the broadcast device (00 if i recall correctly). This means all devices on the line will respond.
Arc Power refers to the current utilised to send the high frequency signal down the fluorescent tube, so it is subject to a logarithmic curve, which for a Xitanium fluo ballast is fine, but for LED drivers, you may need to send the advanced command to use a linear curve response, otherwise you will get a poor response across most of the range and a much larger response at the other end of the dim range.
This linear response is a retro-fix for using fluorescent specific terminology in the fundamental core of the commands, but it does the job.
I did find this in my notes:
DIRECT ARC POWER YAAA AAA0 XXXX XXXX
XXXXXXXX is the Dim level 0-255. 0 = OFF, 255 = MASK / Stop fading. Anything else is a dim level.
AAA AAA is the address, you want to broadcast, which is almost certainly 000 000 or 111 111,
Y I cant remember I'm afraid, experiment.
Wish I could help more