Re: [CAD_CAM_EDM_DRO] port problem

Terry,

I don't know how you're wiring the SSrelay, but you might just need an
open collector transistor to drive the SS relay. Most parallel ports
can SINK more current then they can SOURCE. Are you using the "active
low" level to drive the SS?

Alan

Terry Ackland wrote:

>
> 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
>