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
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 "load.off" 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 mail.telepac.pt>
nutupsdrv(8), upsc(8), upscmd(8), upsrw(8)
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
Sat Jan 14 2006