Re: USB ports ?

Peter,

Not a problem, 100mA is current to spare. The 100mA outputs are open-
drain and diode clamped to the 24VDC power supply of your choice. You
supply the 24VDC to run your relays or whatever, that is not taken
from the USB 5VDC.

Mariss


--- In CAD_CAM_EDM_DRO@yahoogroups.com, Peter Homann <groups@h...>
wrote:

> Hi Mariss,
>
> You will need to add an alternative power source, such as a wall

adapter

> or other power supply. The USB specification imposes limits on

current

> draw. The host first recognizes any peripheral as a low-power

device,

> which is limited to less than 100 mA of current. The peripheral can

ask

> the host to recognize it as a high-power device through a process

called

> enumeration. Once enumeration is complete and permission is

granted, the

> peripheral current limitation increases to 500 mA.
>
> Even 500mA is not enough for 16 outputs at 100mA each, let alone

the

> other power requirements of the G2002.
>
> Cheers,
>
> Peter.
>
> Mariss Freimanis wrote:
> >
> > Hi,
> >
> > The G204V "Vampire" drive design is finished. The first 100 beta
> > units will be available at the beginning of January.
> >
> > That means I'm back on the G2002 (G2005?) project. The FPGA for

the

> > design is being coded right now. In summary, the G2002 will have:
> >
> > 1) 6 axis of step / direction (up to 4 MHz step rate)
> > 2) 6 axies of encoder feedback (CH-A, CH-B, Index and Fault)
> > 3) 8 analog output channels (+/-10V, 0-5V)
> > 4) 8 analog input channels (0-5V)
> > 5) 16 general purpose outputs (5-24VDC, 100mA)
> > 6) 16 general purpose inputs (+/- 100V protected)
> > 7) USB interface, USB powered
> >
> > Mariss
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>

wrote:

> >
> >>R Rogers wrote:
> >>
> >>
> >>>Wasn't Art Fenerty working on a system like this for Mach2? He
> >
> > referred to it as a "cube" or something like that? Basically a

remote

> > pulse generator. However, I understood it was to work from the
> > parallel port. Maybe he already released it and I'm unaware of

it.

> >
> >>>
> >>>
> >>
> >>Yes, hardware by Mariss Freimanis of Gecko Drives, called the
> >
> > G2002, I
> >
> >>think. There is a group
> >>of people working on it. It runs through the USB, I believe.
> >>
> >>Jon
> >
> >
> >
> >
> >
> >
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