Re: Parallel port isolation

Doug,

Some of us are using optical isolators which should help.

I have been using the parallel ports to my cnc router for several years
without a problem.

Bob Campbell

----- Original Message -----
From: Harrison, Doug <dharrison@...>
To: <CAD_CAM_EDM_DRO@onelist.com>
Sent: Monday, November 22, 1999 12:45 PM
Subject: [CAD_CAM_EDM_DRO] Parallel port isolation


> From: "Harrison, Doug" <dharrison@...>
>
> The notion of using the Parallel port to control machinery has fascinated
me
> for 15 years. However, as one who obeys speed limits and never uses
stairs
> without holding on to the rail, I am naturally concerned about hooking my
> non-isolated parallel port I/O to an 80 volt amplifier controlling
inductive
> devices.
>
> Has anyone experienced fried computer syndrome from stray currents in
large
> stepper systems? I know this can be a problem with servo systems, usually
> from ground loops.
>
> Doug Harrison
>
> > Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems in the above catagories.
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> bill,
> List Manager