Re: [CAD_CAM_EDM_DRO] port problem

Terry:

There are no normal printer ports that will sink the current necessary
to draw in most relays. A ULN2003
line driver chip is easy, cheap and will pull in most relays
with no problem. Specs are on the net.

Art

----- Original Message -----
From: "Terry Ackland" <hexagon@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Saturday, October 14, 2000 6:00 AM
Subject: [CAD_CAM_EDM_DRO] port problem


> Guys,
> I have finally got around to connection up the recommended relay
> (CX240D5) to my parallel port and a spindle but I am not having any
> luck.
> I can turn the 5 volts on and off using M-codes but there does not
> seem to be enough current to operate the relay. It was mentioned in a
> previous post that a new parallel port board would be needed if there
> was not enough current available. Would someone advise me on the
> particular board and what should I ask for when ordering one? I am
> using an old 386 which is fast enough for what I need.
> I also have a backup 386 that I picked out of the garbage, it works
> fine but the pins switched by M-codes are always on even when
> instructed to turn off so I think 2 boards are should be ordered?
> Thanks, Terry Ackland
>
>
>
>
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