21 Mar
2011
21 Mar
'11
8:34 a.m.
On Sunday (03/20/2011 at 07:44PM +0000), Tony Duell wrote:
All power cotnollers after a certain date (early 1970s, IIRC) use the
same 'power control bus', os the manual and/or printset for any of them
would be a good start.
Thanks Tony. I plan to put a rocker switch between ground and
ground-for-on and use that to power up my entire "corporate" rack.
Someone has already cut a square hole in the bottom front kick plate
of this rack and so I was looking for something to fill that hole--
plastic plugs, body putty, and then a nice rocker switch came to mind.
With that I won't have to crawl behind the rack to power it all up...
and so this will connect nicely to one of the Power Control Bus connectors
with just two wires and fill the void (so to speak) that someone put in
this panel.
Chris
--
Chris Elmquist
From what I rememebr, the 3 pins are ground,
ground-for-on, and
ground-for off, 'off' taking priority over 'on'
if both are grouded.
There is no lartching in the power controllers.
You interconnect all the power controllrs in the system with
straight-through cables. The power swtich on the CPU box is connected
betweem the ground and ground-fro-on wires, so that turning this on
acrviates all the controllers and powers up everythjing. Over-temperature
swtiches and the like are connected betweem ground and ground-for-off, so
thatr if any device overheats, the whole system shuts down.
Thes signals are not TTL level. They may be up to 24V, nd you may have to
sink enough currnet to operate a reed relay. Just in case you want to
design your own swithcing units...