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

Provided by: nut-server_2.7.4-11ubuntu4_amd64

NAME

       blazer_ser - Driver for Megatec/Q1 protocol serial 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.

SERIAL INTERFACE ONLY
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 situation.

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>