Re: [CAD_CAM_EDM_DRO] Re: Parallel port relays - kit

Generally it is possible to get a couple of output bits out of a serial
port. I've done this on occasion. There are issues to deal with
including the fact that the handshaking lines are buffered and current
limited.

Note that you will be using the handshaking lines as opposed to the data
lines. Generally these are easy to toggle as need but methods vary
from OS to OS.

You still need to take into consideration all of the isolation
requirements. The Serial hardware will have some ESD protection built
in which can be helpful. You can not rely on this built in protection
at all for control circuits.

Dave

On Sat, 2005-01-29 at 15:53 +0000, turbulatordude wrote:
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "knives01us" <knives01@a...>
> wrote:
> >
> > For those of us who are electronically challenged, there is an 8
> > relay, 10 amp per relay, assembled board available at
> > electronicskits.com for about $35 that works well right from the
> > parallel port, no fiddling required. The only other thing needed is
> a
> > 12 volt power supply. I've been using some for over a year for
> > spindle and accesory control, and they work great. There are enough
> > relays left over that spares are built in if ever needed, and for
> me
> > the price was less than the time it would take to order parts, let
> > alone build from scratch.
> >
> > I have no connection with the company.
>
>
> This is where my WISH LIST for software developers comes in.
>
> I would like to have a serial port connection run the relays. many
> relays are for things that do not have any timing issues, coolant
> pump, vacuume, clamps... etc... Having use of relays on the serial
> output would offer some neat possibilities.
>
> Maybe for that EMC port......
>
> There is 12 volts inside the PC, so that is not an issue.
>
> Dave
>
>
>
>
>
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