Ubuntu Manpage: blazer_usb - Driver for Megatec/Q1 protocol USB based UPS equipment

Provided by: nut-server_2.7.4-5.1ubuntu2_amd64

NAME

       blazer_usb - Driver for Megatec/Q1 protocol USB based UPS equipment

NOTE

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

SUPPORTED HARDWARE

       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.

EXTRA ARGUMENTS

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.

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

novendor
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 then).

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.

USB INTERFACE ONLY
vendorid = regex, productid = regex, vendor = regex, product = regex, serial = regex
Select a specific UPS, in case there is more than one connected via USB. Each option specifies an
extended regular expression (see regex(7)) that must match the UPS’s entire vendor/product/serial
string (minus any surrounding whitespace), or the whole 4-digit hexadecimal code for vendorid and
productid. Try -DD for finding out the strings to match.

Examples:

• -x vendor="Foo.Corporation.*"

• -x vendorid=051d* (APC)

• -x product=".*(Smart|Back)-?UPS.*"

bus = regex
Select a UPS on a specific USB bus or group of busses. The argument is a regular expression that must
match the bus name where the UPS is connected (e.g. bus="002", bus="00[2-3]").

subdriver = string
Select a serial-over-USB subdriver to use. You have a choice between phoenix, ippon, cypress, and
krauler. When using this option, it is mandatory to also specify the vendorid and productid.

langid_fix = value
Apply the language ID workaround to the krauler subdriver. This is mandatory for some devices to work
(LDLC, Dynamix and others). You must to provide value (0x409 or 0x4095), according to your device
entry in NUT hardware compatibility list (HCL).

UPS COMMANDS

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

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

       load.on
           Turn on the load immediately.

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

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

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

       shutdown.stop
           Stop a shutdown in progress.

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

       test.battery.start.quick
           Perform a (10 second) battery test.

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

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

BATTERY CHARGE

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.

NOTES FOR THE PREVIOUS USER OF MEGATEC DRIVERS

       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 changed:

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

       dtr and rts
           You need to use cablepower

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

KNOWN PROBLEMS

       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.

       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.

AUTHORS

       Arjen de Korte <adkorte-guest at alioth.debian.org>, Alexander Gordeev <lasaine at lvk.cs.msu.su>