Re: [CAD_CAM_EDM_DRO] Gecko 5V supply using game port/ XY joystick jogging

Doug,

Yes, the digital inputs on the game port are very usable.

Have you experimented with fast PC's (over 600 mhz) and the potentiometer
based control using the game port? I was not able to find jog sticks that
would do what I wanted with fast PC's so I gave up on using that method of
jogging. It worked fine, on some of my PC's and not on others.

Maybe some smarter guys can shed some light on this. I searched the
internet and found very useful info on the game port, but not any that gave
usable info for fast computers.

I was looking for something that could be standardized. The digital inputs
on these ports are standard, however, and handy, I agree.

I do not claim to have the last word on this. I am only sharing from my
experience. I have spent many hours programming around the differences on
the game ports.

Tom Eldredge

----- Original Message -----
From: Doug Fortune <pentam@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, April 02, 2001 9:59 PM
Subject: [CAD_CAM_EDM_DRO] Gecko 5V supply using game port/ XY joystick
jogging


> Hi Tom:
>
> I agree with all your points, but not your conclusion: see below
>
> "Tom Eldredge" <harmonyt@...> wrote:
> >Game port pot use? Some things to consider:
> > The newer computers are dropping the game port in
> > favor of USB, are they not? The newer computers are dropping the ISA
slot too.
>
> I haven't seen one yet with no gameport, but thats besides the
> point. The point is that we will have a future 30 year supply of
> older computers WITH a gameport.
>
> >The pot control of the game port is very crude, and unreliable.
>
> In comparision to what? If it is able to do the job (of accepting
> an analog value of sufficient resolution), then that is sufficient.
>
> Perhaps you are instead referring to the quality of the potentiometers
> on a joystick. That is of course an entirely different matter - not
> to be confused with the basic abilities of the PC's pot inputs.
>
> BTW, due to a number of suggestions from the group, I have
> modified my 'parallel cable hotwired with gameport signals' standard
> scheme slightly, to omit the gameport ground, and have two input
> pots, and 4 digital inputs (to use as the software guys see fit). See
the
> .gif file uploaded to yahoo/egroups below.
>
> However, I maintain it is a good idea to implement a 'digital' feedrate
> override input by having two input bits: 'faster' and 'slower'. If the
> two input are on a rocker (central neutral), then the user can command
> a faster or slower feedrate override (the actual value of the override
> is less important). Another switch, which can ground both lines
> simultaneously can indicate E-STOP to the program.
>
> "Bob Campbell" <bob@...> wrote:
>
> >What I have done to get 5 volts is to mount a 9 pin connector on the
> >PC and then use a 9 pin cable to run to my controller. The reason that
> >I used a 9 pin cable is due to the low cost of the cable. I put 5 volts
on
> >all 9 pins in the PC.
>
> That will work fine. Each pin on a DB9 (or DB15, etc) is good for
> 2 amps at 5V. Keep in mind that actually using the PC power supply
> for the motor driver is to be more discouraged as the size of the
> motors (&drivers) goes up. Thus its probably OK for Nema17's and
> smaller, suspicious for Nema23's, and to definately be avoided for
> Nema34's. Nema42's are RIGHT OUT !!!
>
> The +5V supply we are talking about (taken from the gameport) is a
> mere trickle - meant for powering logic only (or Nema 17's and smaller).
>
> Doug
> - - - - - - - -
>
> > jvicars@... wrote:
> > >The Gecko 201 manual says that the 5V for step and direction must come
> > >from the indexer/pulse source. I.E. the computer. Can you get 5V
through
> > >the parallel port somehow, or do you have to run a 5V line from the
> > > computer to the drivers? Anybody have advice on how to hook this up?
> >
> >
> > mariss92705@... wrote:
> >
> > > Most PCs have a game port. The +5VDC is available on .. the game port.
> >
>
> > doug wrote:
> >
> > This is exactly (among others) the reason why I recently (March 28/2001)
> > announced how to wire up the pBREAK to the game port - see diagram at:
> >
>
http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/CIRCUITS/parallel_to_gam
> eport_pinout.gif
>
> > Doug Fortune
> >http://www.cncKITS.com
>
>
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