Ok, I over-reacted.. The parallel port has always been designed to sink, not source. So while I can get 5V from the USB port or the CNC machine, I can't get 15mA from the port is it's not there. If you're making a machine, having 5V on hand is no more difficult than your stepper supply voltage.
But I suppose recent ports have a higher drive capacity, and opto's run off lower current now, and Gecko have well tested that it all works ;-) Regards Roland On 30 September 2015 at 20:26, Belli Button <[email protected]> wrote: > Because there is no 5V on the parallel port? > > Using a common 0V allows the Gecko to connect directly to the LPT port, > something that is simply not possible with the Chinese drives or others > that > use 5V common. > Or I didn't understand your question... > > > > " I got a G203V in the post today, and am confused. > > Why on earth do Gecko drives use a common ground on the inputs, especially > if they're targetting the parallel port market? > Even the ching drive referred to in this discussion has it the right way, a > common Vcc. > > Regards > Roland" > > > > > On 30 September 2015 at 17:41, Jon Elson <[email protected]> wrote: > > > > > > On Wed, Sep 30, 2015 at 10:58 AM, Dave Cole > > > <[email protected]> > > wrote: > > > > > > > > >> Hey, did I see that you are no longer a Washingtonian? Does that > mean > > >> that you now live in the land of the left hand (MI) ? ;-) My > > >> daughter lives in Chevy Chase and I continually hear about the cost > > >> of this and that. For her Washington is still great, but not as > > >> great as it was when she first moved there. > > >> > > >> > > I grew up in Washington DC. Haven't really missed it too much since I > > left. it WAS cool, however, when visiting. > > I'd take a strange turn off the beltway when it got backed up, and > > start driving on side roads, and my wife would say "Oh, we're lost, > > you need to stop and ask somebody", and I'd say "No, actually, I know > > EXACTLY where I am, and we will pop out on Georgia avenue in 3 > > blocks", even though it looked like we were in the sticks. > > > > Also, going into a Safeway store in Silver Spring, I had been in there > > many times with my Mom 40 years ago, and knowing pretty much where > > everything was, as they had changed NOTHING in that store in the > > meanwhile! > > > > But, if you think Washington is bad, check out the bay area. I used > > to go there for experiments, and try to make a round trip down from > > Berkeley to San Jose, Santa Clara, Mountain View and Oakland to hit > > all the electronic surplus places. Quite a drive! > > > > Jon > > > > > > > > > > ---------------------------------------------------------------------- > > -------- _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ---------------------------------------------------------------------------- > -- > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
