Re: "att caudlet" Limit switch problems

Hi Caudlet,


Thanks for your thoughts on this problem.

Correction these are Home and Limit for the X and Y
switches......and only a Home for the Z axis.
All the wiring is correct as X and Y were working perfectly prior to
setting up the Z axis
The X and Y home and limit are wired parallel and shared the same
pin.


This is the wiring I have used X and Y:

(1)Ground goes to one of the Home and limit switch term.

(2)5volt ---> 10k resistor ----> X and Y axis wire from parallel port
|
|
|---> other Home switch terminal.
|
|
----> Limit switch terminal.


This is the wiring I have used Z:

(1) Ground goes to one of the Home switch term.

(2) 5volt --->10k resistor ----> Z axis wire from parallel port
|
|
----> other Home switch terminal.





I tried another computer box that had a perfect parallel port
(printer was working on it)and it also did not go.



Shelby

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "caudlet" <info@t...> wrote:
>
> >
> > My X and Y limt switches were working fine. When I went to set
up
> > the Z axis it worked at the very beginning with the limit switch
> > wired up.
> > I then decided to test it by disconnecting the limit switch and
> just
> > by joining the ground and power wire together, this also worked.
> >
> >
>
> Huh? You shorted the power to ground? Do you mean you took the
> parallel port manually to ground? Are your limit switches
connected
> in series to a common ground or common +5? Are you using them as
> Home switches too? Sounds like the port pins on the parallel port
> got an overload....bye, bye port pins.
>
> You may have to spring for a plug-in parallel port but it can be
> problematic with PCI buss machines on a DOS based machine. Either
> you need to use a standard ISA buss slot (if you have one) and
card
> or find a PP that has DOS drivers and load them in the COnfig.sys
> file on bootup.
>
> Before you do anything you need to confirm how your limits are
> connected. You might want to consider one of the buffered port
cards
> that will protect your internal parallel port.