hello duivenhok, i don't have an multus, but i usualy work with the CAS disabled
onestly, i had no idea that red blinking means that cas is disables on my lathe is always blinking ...
i have these M codes :
... 510 511 mill
... 867 866 lathe
so far i never checked, but i believe that cas is enabled. by default, at power-up
i don't know what toogles that behaviour / kindly