RE: [CAD_CAM_EDM_DRO] port problem

You need to use a transistor switch to drive the relay. When this was asked
a year or so ago I put the instructions on my website. Go to:
http://www.ktmarketing.com/CNC.html
Select the 5th link from the top "Parallel Port Hookup to Controller". At
the bottom of the page is a diagram and explanation of how to hook this up
with a 2N2222 or any suitable NPN transistor.

Tim
[Denver, CO]

> 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