  UPS mini HOWTO
  Զ, krkim@epilab.snu.ac.kr
  v1.0, 18 June 1998

  ǻͿ ϱ   ȣ   UPS  ̻
     ȣ ̿   ˴ٿ ڵ 
  ______________________________________________________________________

  

  1. Ұ
  2. ۾ 
  3. ʿ ǰ
  4. ϵ 
  5. ø Ʈ  ȣ
  6. α׷ 
  7. ͸ ɷ ˾Ƴ
  8. Ÿ ٸ  ͵
  9. 

  ______________________________________________________________________

  1.  Ұ

  UPS ǻ ο ġϴ  ׷   ƴ,
     ̸ ϰ  ó(͸  Ǳ
   ˴ٿ) ϴ  UPS   Ʈ ְ ̸ 
    ִ α׷ ʿϴ.   UPS 
  ̻ ȣ   쿡 ּ  
  ϰ   ˴ٿ ų  ִ  ϰ Ѵ.

  2.  ۾ 

  1. UPS  ǻ͵(1 Ǵ  ̻) ÿ  
     (ּ 2 ̻)

  2. UPS ԷµǴ  Ϲ DC͸ ϰ  Ϳ 
     ⸦ ̿Ͽ ҿ ̰  ְ ÿ ٴ
     ȸθ 

  3.  ȸθ ǻ Ʈ   ֵ Ʈ 
     װ  ȣ 

  4. ȣ ǻ OS ϰ ø 

  3.  ʿ ǰ

     
        5V ̳ 12V  ϱ .  ̰ų   Ⱑ
          ִٰ Ⱑ   ȸθ  ȴ.
        ڴ Ե  𵩿  .  
        𵩿 5V ̰ 2 ޷ִ.

     DC
            ִ  µǾ Ѵ.
     10K 0hm¥ 
         ڸ ,,,() ̴. ̸ Ϸ 
         ڻ ٸ  ǿ  ã   ̴.

     ø Ʈ 
          ڻ ٸ ̰  ϳ  ̴.

     
          ణ ( 20cm) ø Ʈ ڻ    ȿ
        ִ  ϸ  ̴.

     Ÿ
        , ε, , (), Ƽ׽ 

     α׷
        Alessandro Rubini powerd 2.0 ̿Ͽ. sunsite 
        ã   ̴.

  4.  ϵ 

  1.  ̳  ڼ    ׸ Ǿ
     ִ  ΰ  ̴.   ɿ    Ѵ.
     +, - Ű  ʿ .

  2. ø Ʈ   ؼ    ִ  
         DTR DSR  ؼ ϰ DTR
     DCD 10K Ohm¥   Ѵ. ø Ʈ  ȣ 
      Ѵ.

  3. ̿  쿡 Ǵ    ȮѴ.
     Ƽ׽ װ Ȯ ɰ Ϳ  ⸦ 
     ν     ̴.

  4. 3   ϳ DCD ٸ ϳ GND Ѵ.

  5.   ͵  ʵ   ش.

  5.  ø Ʈ  ȣ

  츮 ǥ ø Ʈ ΰ  ִµ 9pin 25pin
  װ̴.    ʿ ϴ  ̸ ȣ  .
   ȣ ø Ʈ 迡 ˸ ¥  ִ. ڼ
  캸 ٶ.

                  9      25(pin)
       DTR    4      20
       DSR    6      6
       DCD    1      8
       GND    5      7

  ٸ ɵ ȣ ˰ ôٸ UPS HOWTO ãƺ ٶ.

  6.  α׷ 

    powerd 2.0  丮 Ǯ  ϰ /sbin/ powerd
       ´.

    /etc/powerd.conf  Ѵ. ڴ   Ͽ.
     (2° ø Ʈ )

       serialline         /dev/cua1
       monitor            DCD
       failwhen           low
       asserthigh       DTR

  , α׷ ۵Ǹ DTR   10K Ohm¥ 
  Ǿִ DCD   ΰ(high)ȴ.  Ǹ DCD GND
  ̿ ؼ  Ǵµ ̿ DCD  0V ǰ ȣ
  low Ǹ ̸ powerd ϴ ̴.

    õ   -  /etc/rc.d/rc.local(ƴϸ   ϴ
     ٸ )   ߰Ѵ.

          if [ -f /sbin/powerd ]; then
              echo "Running powerd"
              /sbin/powerd &
          fi

    /etc/inittab - ڴ    Ͽ.

          pf::powerfail:/sbin/shutdown -f -h +300 "Power Failure; System Shutting Down"
          pr::powerokwait:/sbin/shutdown -c "Power Restored; Shutdown Cancelled"

  ù°   Ǿ  鿡 ̸ ˸
  300(5ð) Ŀ ˴ٿ ϵ ϴ ̰   
  Ǿ  ˴ٿ ϴ ̴.   Ŀ ˴ٿ
  Ѿ ϴ  ǿ Ѵ. inittab Ͽ  
   ݿǵ Ϸ  ϴ ƴϸ Ʈ Ʈ
  "telinit Q" Էϸ ȴ.

    谡

     Ʈ  "telinit Q" Էϰ powerd Ѵ. ׷ 
     ͸  10  ٸ ˴ٿ 300 Ŀ ۵ ̶
      ̴.   ¿ ͸ ٽ   10ʰ ٸ
     ˴ٿ ҵǾٴ ޽ ´. ̷ν    ۾
      ̴.

    ˴ٿ Ұ   

     Ȥ ڰ Ͽ powerd 2.0   α׷ 
     쿡 α׷ ׿  ˴ٿ Ұ    ִ.  
     ħϰ "shutdown -c" ˴ٿ   powerd.c
     Ѵ. ڰ    (diff ) ü
     ҽڵ带      ƴϹǷ ߸ Ͽ  𸥴.
     ƹ ڴ ϴ    ־Ƿ ̷ ļ
     ̴.

     ϴ  powerd.patch  Ѵ.

       --------------- powerd.patch start! ----------------
       1127,1145d
       1098a
         /* Create an info file for init. */
         unlink(PWRSTAT);
         fd = open(PWRSTAT, O_CREAT|O_WRONLY, 0644);

         if (fd<0)
           {
           PERROR(PWRSTAT);
           return 1; /* maybe next time... */
           }

         if (action==ACT_OK)
           write(fd, "OK\n", 3);
         else
           write(fd, "FAIL\n", 5);
         close(fd);

         MESSAGE("Telling init about...");
         kill(1, SIGPWR);
       .
       1,$wq
       --------------- powerd.patch end! ----------------

  ׷  "ed powerd.c < powerd.patch" Ʈ Էϸ
  ڵ α׷ ġ ̴. ̷  ٽ ϰ  
  ٶ.

  7.  ͸ ɷ ˾Ƴ

  ͸ 뷮 UPS ɿ  ū  ģ.  UPS
  ڵý UX210S 1.1KW̴.  ͸  ִ
  뷮   Ŵ 󿡴 4а   ִٰ  ִ.
   ǻ 4  2븦 UPS Ͽ  450W 
  ִµ   ͸      14   
  ִ.  Ŀ 2̸ ͸ ȣ  UPS ˴ٿ ȴ. 
  ִ   ִ ð ̳ ý ˴ٿ Ѿ Ѵ. ý
  ˴ٿ ð   ּ 2 ̻̾ ϴ. ܺ
  ͸ ķ Ͽ 쿡  뷮 ׽Ʈ  ƾ
  ϴµ,  ͸     ð  
  ȴ. ̶ Ѱ  ó ͸ Ͽ 쿡 ͸
   Ǿ ʱ  3 ̻     
   ƾ Ѵٴ ̴. ͸    ð ð
  - Ϸ ̰  ׽Ʈ  ƾ Ѵ. Ϲ UPS 12V¥
  ͸    ¿ 13.75V̴.

  8.  Ÿ ٸ  ͵

   UPS   ̻ ǻͰ Ǿ 쿡 powerd ϸ
   ̻ ϴ   Ŭ̾Ʈ ǻͷ  ̻
  ߾Ӱ   ִ. powerd readme о ٶ.  
  Ƽ 쿡      ִµ, 
  迭  ٲ Ѵ.   UPS-Howto  ִ.

  9.  

    Rubin, A. 1995, powerd 2.0 README

    Stein, H. J. 1997, UPS HOWTO v 2.02

