Re: [CAD_CAM_EDM_DRO] Re: RE: index feature on optical encoder

plastiguy@... wrote:

>Ray -
>Is this to say that the index pulse is constantly pulsing, but the first
>pulse that occurs AFTER the home switch is made is the pulse that the software
>sees and assigns as home position?
>If so, that's very clever, and I think I'll be doing just that.
>
>

Yes, essentially, that's how it works. Take care if you try to do this with
Gecko drives, however, as the encoder is being powered by the Gecko, not
by the computer. There could be ground issues, as the Gecko's step and
direction
inputs are opto-isolated. EMC has all the code to handle this, and at least
in servo systems, it expects an index pulse from something, and won't home
without it. On my PPMC and USC interfaces, I have to "hot wire" the
index input to either the encoder A channel with the PPMC, or to the step
output on the USC, if the hardware does not provide an index signal.

Jon