andy pugh wrote: > > The LinuxCNC "bldc" component understands the Fanuc "red cap" > commutation scheme, though, and can convert it to suit drives with a > different feedback requirement (synthetic Hall signals, for example) > This is only true for the first-generation pulse coders, the later ones used serial output and an interrogate pulse from the controller. These came in absolute and incremental versions. The absolute ones give a low-res absolute motor position immediately on power-on, the incremental ones do not have this data, and so need a battery to retain position when off, and a brake to keep the motor from moving when the encoder is off.
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