Nut upsuser - Aug 2010 - Fw: Interfacing a Contact-Closure UPS to Mac OS X and Linux

Hi David

As per the link 

http://www.llondel.org/ups.shtml

& the final testing paragraph.

I have set up a Lantech UPS similiar to your write up for  your Powersure
Proactive and Powersure Personal  UPS's

On LOW BATT
it shuts down OK.


BUT as with other  many UPS's during the 
wait period from low batt to start of shutdown ... IE 


[SHUTDOWNCMD "/sbin/shutdown -h +20"]

20 minutes in this case.


Reapplying AC power before the 20 minute mark stops the shutdown & all is
normal again.

This option isn't working on my setup.

What happens in your setup.


What I could do a run a script that cancels the shutdown.  ... with   "
shutdown -c" .

But there is no alert as to AC power being restored.

Pulling power before "LOW BATTERY"  there is an alert.

IE from /var/log/syslog .............

Aug 21 12:12:05 roj-desktop upsmon[18721]: UPS powerpal at localhost on line
power

But after LOW BATTERY is detected there is NO such alert.

thx

Any comments greatly appreciated.



Roger Salisbury
roger at pchelp2u.com.au
75 Mawson Pde 
Chifley Sydney NSW 2036
0296618811 mob 0400339007








  
Interfacing a Contact-Closure UPS to Mac OS X and Linux
Having acquired some cheap Liebert Powersure Proactive and Powersure Personal
UPS boxes, I set about interfacing them to my Mac and Linux machines. In the
process I learned a few things about OS X that I didn't know before.

The UPS
Both models of UPS have a 9-way D socket on the back with a basic
contact-closure signalling arrangement that allows On Battery and Low Battery to
be indicated by the closing of relay contacts. The Proactive uses relays and is
polarity-independent whereas the Personal uses solid-state switching and is
polarity sensitive. It also assigns a remote-shutdown function to pin 6.

      PIN FUNCTION 
      1 Low Battery (+) 
      2 Not Used 
      3 Not Used 
      4 UPS Off 
      5 UPS Ground 
      6 On Battery (NC)/Remote Shutdown 
      7 Low Battery (-) 
      8 On Battery (COM) (-) 
      9 On Battery (NO) (+) 

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On Aug 21, 2010, at 5:17 AM, Roger Salisbury wrote:
> Hi David
>
> As per the link
>
> http://www.llondel.org/ups.shtml
Not sure if David is on the list, but we can probably help.
> & the final testing paragraph.
>
> I have set up a Lantech UPS similiar to your write up for  your  
> Powersure Proactive and Powersure Personal  UPS's
>
> On LOW BATT
> it shuts down OK.
Do you get the "OB" ("on battery") status before
"LB" ("low battery")?
> BUT as with other  many UPS's during the
> wait period from low batt to start of shutdown ... IE
In NUT, there is no wait period - when upsd sees the LB status from  
the driver, it starts the shutdown sequence.

The idea is that if an UPS says "low battery" (versus just "on  
battery") then it only has a few minutes left.

The other potential problem with allowing a return from the low  
battery state is that if the power returns for only a minute or two,  
and the UPS starts up, there will not be enough battery power to  
detect whether or not the computer should keep starting up or not.