Hi,

You do mean ATX, not AT right? as in there being only one double row
connector, rather than two single rown connectors, right?

If I remember correctly, and I like to think that I do, all you have to do
is short the green wire to the blak wire.  Should be doable with a power
transistor (or maybe even a signal transistor) to turn ON the power supply.

So, what you need to do is break the connection that that green wire makes.
A relay would work for that.  Also remember that the purple wire is a source
of +5V even when the power supply is "off" (when the green wire is floating)
so you can power your PIC control circuit from that.

Hope that helps.

Regards,

Brendan

----- Original Message -----
From: "Jim Main" <jim.main@MAINTECH.CO.UK>
To: <PICLIST@mitvma.mit.edu>
Sent: Wednesday, June 19, 2002 9:04 AM
Subject: [EE]: Cycling power remotely on an ATX PC


> I have an application at a remote site where I send data over a WAN to a
PC,
> which then talks to a PIC interface controlling various bits of equipment.
>
> Since PC's occasionally crash, I've put in a telephone-operated switch on
> the power feed to the PC.
>
> Problem is, I've just realised that cycling the power in this way means
the
> PC won't boot up (since the front power button needs to be cycled after a
> mains reset).
>
> Any suggestions?
>
> I'm thinking maybe of another pic that delays a bit then closes a relay
> contact across the power jumper on the motherboard....
>
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