Re: DRO function when using gekos in manual mode

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Alan Marconett KM6VV
<KM6VV@a...> wrote:

> Hi Mariss,
>
> Yes please!
>
> Alan KM6VV
>
> Mariss Freimanis wrote:
> >
> > You can use the encoder as a DRO if you don't mind wiring a little
> > circuitry. The DRO will read the position while it is servo
> > controlled, or if you reset the G320 (motor free-wheels), you can
> > read position while hand cranking the machine. Here's how to do

it:

> >
> > 1) Power the encoder from your PC +5VDC supply (available on GAME
> > PORT pin 1). Take the encoder CHANNEL A and CHANNEL B outputs to
> > where ever they have to go on your PC for the DRO function.
> >
> > 2) Get a dual-channel opto-isolator. Take the opto collectors to

the

> > G320 PHASE A and PHASE B inputs. Take both opto emitters to the

G320

> > ENC- input.
> >
> > 3) Put 180 ohm resistors in series with the opto LEDs. Take the

LED

> > cathodes to the encoder CHANNEL A and CHANNEL B outputs. Take both
> > opto LED anodes to your PC +5VDC.
> >
> > 4) Place a 470 ohm resistor across the G320 ENC- and ENC+

terminals.

> >
> > Now both the PC and the G320 can use the encoder. This also gets
> > around the 50mA maximum encoder supply current limit of the G320

so

> > higher supply current encoders can be used.
> >
> > If there is interest, I will draw up and post a circuit diagram of
> > this to the group.
> >
> > Mariss