[K12OSN] OT: Hardware Hacking: Share one UPS between two computers

Andrew Fisk andy at spitcomp.com
Mon Dec 19 14:03:57 UTC 2005

Why not just have the dmz box ping the LTSP box and shut it's self  
down if it misses 4 or 5 pings?  Its quick, easy and won't burn out  
your motherboard if you mess up.


Spitfire Computer Services
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Sewickley, PA 15143
Phone (412) 749-0162
Fax: (412) 749-0203
andy at spitcomp.com

On Dec 19, 2005, at 2:42 AM, Jon Spriggs wrote:

> On 18/12/05, Peter Hartmann <ascensiontech at gmail.com> wrote:
>> I'm looking to share an APC UPS between to computers with USB in a  
>> DIY
>> fashion. Can't I just splice 2 A male connectors (leaving the 5v +
>> unconnected) with a female A connector? To be more specific I mean to
>> connect all the pin 2s to each other; all the pin 3s to each other;
>> all the pin 4's to each other and leave all the pin 1s unconnected.
>> I'm trying the UPS to signal the shutdown without networking because
>> one computer is in the dmz and the other is the LTSP server.
>> What do you think, will that work?
> Peter,
> The correct route is to add a "ShareUPS" device to the mix. The
> shareUPS takes a feed from the UPS and then splits out 4 or 5 serial
> ports. I don't know the pricing - I just get given them at work!
> Another route could be to try and copy /dev/tty0 to /dev/tty1 and then
> run up the UPS software - see if that works?
> Jon
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