Re: [Emc-users] Machmaker USB -> Parallel

[Dave M. <n3...@gm...>]

On Thu, Jul 23, 2020 at 3:25 PM John Dammeyer <jo...@au...> wrote:
>
>
>
> > > Is the 7i92 less expensive?  Do we even know the price of this USB->DB25
> > > device?
> > >
> >
> > $65 + $25 shipping to the US.  Given the shipping cost of the 7i92
> > plus the cost of the cable needed it is less expensive.
>
> Not true I think.  2x $65 plus perhaps still $25 shipping to the US since the 7i92H has two ports.   At that price point there are other MESA/PICO solutions that also have a break out board so now you have to factor that into the price too.
>
> And it's still USB.  Can it handle a 2500 line quadrature encoder?   The control is the small part of the overall CNC conversion.  I found that buying the CNC Cape for the BeagleBone  which all around seemed like the lowest entry cost ultimately wasn't cheaper and it's sitting in a box.
>
> John
>
>

For my purposes I don't need two ports or the ability to read an
encoder.  One port is enough.  I am driving four steppers and reading
a few home switches.  This guy is claiming 150 kHz so way faster than
I need for 3200 microsteps per inch at 3 ips.

Dave