Provided by: nut-server_2.7.2-4ubuntu1_i386 bug


       blazer_ser - Driver for Megatec/Q1 protocol serial based UPS equipment


       This man page only documents the hardware-specific features of the
       blazer driver. For information about the core driver, see nutupsdrv(8).


       The blazer driver is known to work with various UPSes from Blazer,
       Energy Sistem, Fenton Technologies, General Electric, 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.

       All devices with a serial interface (use the blazer_ser driver) and
       many with a USB interface (use the blazer_usb driver) are supported.


       You may need to override or provide defaults for some values, depending
       on the make and model of your UPS. The following are the ones that most
       likely will need changing (see ups.conf(5)):

       default.battery.voltage.high = value
           Maximum battery voltage that is reached after about 12 to 24 hours
           charging. If you want the driver to report a guesstimated
           battery.charge, you need to specify this (see BATTERY CHARGE).

       default.battery.voltage.low = value
           Minimum battery voltage just before the UPS automatically shuts
           down. If you want the driver to report a guesstimated
           battery.charge, you need to specify this (see BATTERY CHARGE).

       default.battery.voltage.nominal = value,
       override.battery.voltage.nominal = value
           Some devices show a wrong nominal battery voltage (or none at all),
           so you may need to override or set a default value.

       override.battery.packs = value
           Some devices report a part of the total battery voltage. For
           instance, if battery.voltage.nominal is 24 V, but it reports a
           battery.voltage of around 2 V, the number of battery.packs to
           correct this reading would be 12. The driver will attempt to detect
           this automatically, but if this fails somehow, you may want to
           override this value.

       ondelay = value
           Time to wait before switching on the UPS (minutes). Note that a
           value below 3 minutes, may cause earlier firmware versions to not
           switch on automatically, so it defaults to 3 minutes. The
           acceptable range is 0..9999 minutes.

       offdelay = value
           Time to wait before shutting down the UPS (seconds). This value is
           truncated to units of 6 seconds (less than 60 seconds) or 60
           seconds (more than 60 seconds). Defaults to 30 seconds. The
           acceptable range is 12..600 seconds.

           Some UPSes will lock up if you attempt to read rating information
           from them. Setting this flag will make the driver skip this step.

           Some UPSes will lock up if you attempt to read vendor information
           from them. Setting this flag will make the driver skip this step.

       protocol = string
           Skip autodetection of the protocol to use and only use the one
           specified. Supported values megatec, megatec/old, mustek and zinto.

       runtimecal = value,value,value,value
           Parameter used in the (optional) runtime estimation. This takes two
           runtimes at different loads. Typically, this uses the runtime at
           full load and the runtime at half load. For instance, if your UPS
           has a rated runtime of 240 seconds at full load and 720 seconds at
           half load, you would enter

               runtimecal = 240,100,720,50

           The first load should always be higher than the second. If you have
           values available for loads other than 100 and 50 % respectively,
           you can use those too, but keep them spaced apart as far as
           reasonably possible. Just don’t get too close to no load
           (prediction of runtime depends more on idle load for the battery

       chargetime = value
           The time needed to fully recharge the battery after being fully
           discharged. If not specified, the driver defaults to 43200 seconds
           (12 hours). Only used if runtimecal is also specified.

       idleload = value
           Minimum battery load used by the driver to estimate the runtime. If
           not specified, the driver defaults to 10%. Only used if runtimecal
           is also specified.

       cablepower = string
           By default the driver will set DTR and clear RTS (normal). If you
           find that your UPS isn’t detected or the communication with the UPS
           is unreliable, you may try if clear DTR and set RTS (reverse), set
           DTR and RTS (both) or clear DTR and RTS (none) improves this


       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).

           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.

       test.battery.start value
           Perform a battery test for the duration of value minutes.

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


       Due to popular demand, this driver will report a guesstimated
       battery.charge and optionally battery.runtime, provided you specified a
       couple of the EXTRA ARGUMENTS listed above.

       If you specify both battery.voltage.high and battery.voltage.low in
       ups.conf(5), but don’t enter runtimecal, it will guesstimate the state
       of charge by looking at the battery voltage alone. This is not reliable
       under load, as this only gives reasonably accurate readings if you
       disconnect the load, let the battery rest for a couple of minutes and
       then measure the open cell voltage. This just isn’t practical if the
       power went out and the UPS is providing power for your systems.

                                battery.voltage - battery.voltage.low
           battery.charge =  ------------------------------------------ x 100 %
                             battery.voltage.high - battery.voltage.low

       There is a way to get better readings without disconnecting the load
       but this requires one to keep track on how much (and how fast) current
       is going in- and out of the battery. If you specified the runtimecal,
       the driver will attempt to do this. Note however, that this heavily
       relies on the values you enter and that the UPS must be able to report
       the load as well. There are quite a couple of devices that report 0 %
       (or any other fixed value) at all times, in which case this obviously
       doesn’t work.

       The driver also has no way of determining the degradation of the
       battery capacity over time, so you’ll have to deal with this yourself
       (by adjusting the values in runtimecal). Also note that the driver
       guesses the initial state of charge based on the battery voltage, so
       this may be less than 100 %, even when you are certain that they are
       full. There is just no way to reliably measure this between 0 and 100 %
       full charge.

       This is better than nothing (but not by much). If any of the above
       calculations is giving you incorrect readings, you are the one that put
       in the values in ups.conf(5), so don’t complain with the author. If you
       need something better, buy a UPS that reports battery.charge and
       battery.runtime all by itself without the help of a NUT driver.


       The blazer drivers having replaced the megatec ones, some configuration
       changes may be required by users switching to blazer.

       Part of this, the following megatec options, in ups.conf, have to be

           You need to use default.battery.voltage.high and

       dtr and rts
           You need to use cablepower

           This parameter can simply be discarded, since it was a wrong
           understanding of the specification.


       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

       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 and load value is known to be bogus in some models.


       Arjen de Korte <adkorte-guest at>, Alexander Gordeev
       <lasaine at>


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

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

       The NUT HCL: