Re: index feature on optical encoder

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "plastiguy" <plastiguy@a...>
wrote:

> Group -
> The US digital encoder on my DC servo motors (for CNC router
> application) is 5 pin encoder, which includes the "index" signal
> along with +5VDC, ground and channels A and B. I have a rough
> understanding of the "index" signal that this is a once per
> revolution signal (I think) that can be used for various functions.
> I'm running these off of Gecko G320 drives with a Sound Logic
> breakout board and Mach 2 software. Anybody with an idea of whether
> I should wire this up or if it'll prove to be useful or not? Thanks
> for any help here.
> Scott

One common use of an index pulse is to drive a tach for RPM readout.
Another is to logically AND it with a home switch to improve
resolution. You can just leave it disconnected also, Mach2 does not
use it.

Ken