RE: [CAD_CAM_EDM_DRO] Relay controlled by parallel

Also remember that many (most?) parallel ports don't have enough current to
drive a relay (solid state or standard) directly. You may need to put in a
transistor to do the trick and drive the relay from the transistor output.
In have some info on this at http://www.ktmarketing.com/CNC.html then pick
the 5th link from the top titled "Parallel Port Hookup to Controller". It is
on the bottom of that page.

Tim
[Denver, CO]

> -----Original Message-----
>
>
>
>    From: cclough@...
>
> Hi all,
> Thanks a million for all your info... have yet another question. How
> hard would it be to control a relay from the parallel port; using a G-
> code command. I am trying to use a plasma torch; and upon sending the
> signal to the relay, it'll turn the plasma on.
> Any thoughts?
>
>
> Chris
>
> Several EMC users have grabbed one of the coolant commands (m7, m8, m9)
> and have used them to turn on other stuff. You could also use
> the spindle
> command. You would need a second parport if you use steppers for axis
> motion.
>
> HTH
>
> RayH
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/