Man Linux: Main Page and Category List


       megatec - Driver for Megatec protocol based UPS equipment


       This  man  page  only  documents  the hardware-specific features of the
       megatec  driver.  For  information   about   the   core   driver,   see


       The  megatec  driver  is  known to work with various UPSes from Blazer,
       Energy Sistem, Fenton Technologies, Mustek and  many  others.  The  NUT
       compatibility table lists all the known supported models. Keep in mind,
       however, that other models not listed there may also be  supported  but
       haven't been tested.

       On  models  with  both a serial port (RS-232) and an USB port, only the
       serial port is supported. Connecting a computer which does not  have  a
       serial interface to the UPS serial port using a USB-to-serial converter
       should work, provided the converter  is  supported  by  your  operating


       This driver supports some extra parameters (see ups.conf(5)):


              Optional.  Specify the UPS manufacturer name.


              Optional.  Specify the UPS model name.


              Optional.  Specify the UPS serial number.


              Optional.  After receiving a shutdown command, the UPS will wait
              this many minutes before turning off the load. Specify  this  if
              the  UPS must remain online for a short period of time after the
              computer  has  powered  down.  The  default  is  0   (turn   off


              Optional.   After  turning  off the load (see offdelay), the UPS
              will wait at least this many minutes before coming back  online.
              If  line  power gets restored before this delay expires, the UPS
              will wait until it does. If line power gets restored after  this
              delay  expires, the UPS will power on the load immediately.  The
              default is 2 minutes.


              Optional.  Low battery level (%). Overrides the hardware default
              level.  Cannot  be used if the driver is unable to calculate the
              charge  percentage  for  your  UPS  automatically   (see   KNOWN
              PROBLEMS) and the battvolts parameter isn't specified.


              Optional.  The battery voltage interval (see KNOWN PROBLEMS).


              Optional.  Multiply the reported battery voltage by this number.
              Some devices  report  only  a  fraction  of  the  total  battery
              voltage. The default is 1.


              Optional.   Some  UPS  models  need the DTR serial line set to a
              specific state, either 0 or 1. See also rts.


              Optional.  Some UPS models need the RTS serial  line  set  to  a
              specific state, either 0 or 1. See also dtr.


              Optional.   This  option should be used if upsc(8) shows the UPS
              status as OFF when it's clearly on. This will force  the  driver
              to ignore the OFF status altogether.


              Optional.   This  option can be used to change the wait interval
              between each character that is sent to the UPS,  between  1  and
              1000  milliseconds.  Some  models  may  need this if the default
              interval (100 milliseconds) proves to be too long, or too short.


       This driver supports some instant commands (see upscmd(8)):

              Toggle the UPS beeper. (Not available on some hardware.)

              Turn on the load immediately.
              Turn off the load immediately (see KNOWN PROBLEMS).

              Reset minimum and maximum input voltage status.

              Restarts the UPS watchdog timeout. The watchdog is started if it
              isn't running, which means the UPS shuts down one  minute  after
              this  command  is  executed  for  the  last time, restarting one
              minute   afterwards.   To   cancel   the   watchdog,   run   the
              "shutdown.stop" command.

              Turn off the load and return when power is back. Uses the timers
              defined by ondelay and offdelay.

              Turn off the load and remain off (see KNOWN PROBLEMS). Uses  the
              timer defined by offdelay.

              Stop a shutdown in progress.

              Perform a long battery test (Not available on some hardware.)

              Perform a (10 second) battery test.

              Stop a running battery test. (Not available on some hardware.)


       The  battery charge (%) value is only a best-effort calculation and may
       be incorrect, or non-existant, for some UPS models. In  any  case,  you
       can  always resort to finding the voltages at which the battery becomes
       fully discharged and fully charged, and specify them manually using the
       "battvolts"  option.   If you do this, please notify the author of this
       driver  so  that  information  can  be  added  to  the   NUT   hardware
       compatibility  list. Note that if you also specified the "battvoltmult"
       option, you need to divide the found voltages for fully discharged  and
       fully charged by this number.

       Some  UPS  commands  aren't supported by all models. In most cases, the
       driver will send a message to the system log when  the  user  tries  to
       execute  an  unsupported command. Unfortunately, some models don't even
       provide a way for the driver to check  for  this,  so  the  unsupported
       commands will silently fail.

       Both  the  "" and "shutdown.stayoff" instant commands are meant
       to turn the load off indefinitely. However, some UPS models don't allow
       this.   When this is the case, the driver will tell the UPS to turn off
       the load for 9999 minutes (about 7 days) and a message will be sent  to
       the system log.

       Some  models report a bogus value for the beeper status (will always be
       "enabled" or "disabled"). So, the "beeper.toggle" command may appear to
       have  no  effect in the status reported by the driver when, in fact, it
       is working fine.

       The temperature value is also known to be bogus in some models.


       Carlos Rodrigues <carlos.efr at>


       nutupsdrv(8), upsc(8), upscmd(8), upsrw(8)

   Internet resources:
       The NUT (Network UPS Tools) home page:

                                Sat Jan 14 2006