bionic (8) belkinunv.8.gz

Provided by: nut-server_2.7.4-5.1ubuntu2_amd64 bug

NAME

       belkinunv - Driver for Belkin "Universal UPS" and compatible

NOTE

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

SUPPORTED HARDWARE

       The belkinunv driver is known to work with the Belkin Universal UPS models F6C800-UNV and F6C120-UNV, and
       is expected to work with other Belkin Universal UPS models. The driver only supports serial
       communication, not USB.

       The Trust UPS and older Belkin units are not supported by this driver, and neither are the Belkin Home
       Office models (F6H500-SER and so forth). However, some Belkin models, such as the Regulator Pro, are
       supported by the belkin(8) driver, and the Home Office models are supported using the genericups(8)
       driver with upstype=7.

SOFT SHUTDOWN WORKAROUND

       One problem with the Belkin Universal UPS is that it cannot enter a soft shutdown (shut down the load
       until AC power returns) unless the batteries are completely depleted. Thus, one cannot just shut off the
       UPS after operating system shutdown; it will not come back on when the power comes back on. Therefore,
       the belkinunv driver should never be used with the -k option. Instead, the -x wait option is provided as
       a workaround.

       When called with the -x wait option, belkinunv behaves as a standalone program (i.e., it does not fork
       into the background). It performs one simple task: it connects to the UPS, waits for AC power to return,
       and then exits with status 0.

       This is meant to be used in a shutdown script as follows: during a shutdown, after all filesystems have
       been remounted read-only, and just before the system would normally be halted: check /etc/killpower (or
       similar) to see if this shutdown was caused by upsmon(8), and if yes, call belkinunv -x wait. If AC power
       comes back on, belkinunv exits, and things should be arranged so that the system reboots in this case. If
       AC power does not come back on, the UPS will eventually run out of batteries, kill the computer’s power
       supply, and go into soft shutdown mode, which means everything will reboot properly when the power
       returns. In either case, a deadlock is avoided.

       In addition, if an optional integer argument is given to the -x wait option, this causes belkinunv to
       wait not only for AC power to be present, but also for the battery charge to reach the given level. I use
       this as part of my startup scripts, to ensure that the batteries are sufficiently charged before the
       computer continues booting. This should be put very early in the startup script, before any filesystems
       are mounted read/write, and before any filesystem checks are performed.

       Several other -x options are provided to fine-tune this behavior. See the options below for detailed
       descriptions. See the examples below for examples of how to use belkinunv in shutdown and startup
       scripts.

OPTIONS

       See also nutupsdrv(8) for generic options. Never use the -k option with this driver; it does not work
       properly.

       -x wait[=level]
           When this option is used, belkinunv does not fork into the background, but behaves as a standalone
           program. It connects to the UPS and waits until AC power is present. If level is specified, it also
           waits until the battery charge reaches at least the given level in percent. Then, and only then,
           belkinunv exits. In addition, while belkinunv runs in this mode, it displays a status line with
           information on the UPS status and battery level. This is intended for use in the computer’s shutdown
           and startup scripts, as described under Soft Shutdown Workaround above.

       -x nohang
           This option only has an effect when used in conjunction with the -x wait option. It causes belkinunv
           to exit if a connection with the UPS cannot be established or is lost, instead of retrying forever,
           which is the default behavior. The -x nohang option should be used in a startup script, to ensure the
           computer remains bootable even if the UPS has been disconnected during the power failure (for
           instance, you attached your computer to a generator, carried it to a neighbor’s house, or whatever).

       -x flash
           This option only has an effect when used in conjunction with the -x wait option. It causes the UPS
           load to be shut off for a short time ("flashed") just after the AC power has returned and the
           requested battery level (if any) has been attained. This is useful if slaves are attached to this
           UPS; the flash will cause all of them to reboot. Note that, due to the design of the Belkin UPS
           hardware, the load shutdown lasts ca. 1—2 minutes; a shorter flash cannot be performed reliably.
           Also, the computers will reboot at the scheduled time, on battery power if necessary, even if AC
           power fails again in the meantime. This should not be a problem, as your startup scripts can catch
           this situation.

       -x silent
           This option only has an effect when used in conjunction with the -x wait option. It suppresses the
           status line which belkinunv would normally print.

       -x dumbterm
           This option only has an effect when used in conjunction with the -x wait option. It changes the way
           in which belkinunv prints its status line. Normally, terminal control sequences are used to overwrite
           the same line with new status information, each time the status is updated. This may not work on all
           terminals. If the -x dumbterm option is given, each status update is written on a new line.

VARIABLES

       battery.charge, battery.runtime
           not supported by all hardware.

       battery.voltage, battery.voltage.nominal, input.frequency, input.frequency.nominal
           e.g. 60 for 60Hz

       input.sensitivity
           writable: normal/medium/low

       input.transfer.high
           writable: high transfer voltage point in V

       input.transfer.low
           writable: low transfer voltage point in V

       input.voltage, input.voltage.maximum, input.voltage.minimum, input.voltage.nominal, output.frequency,
       output.voltage, ups.beeper.status
           writable. Values: enabled/disabled/muted. This variable controls the state of the panel beeper.
           Enabled means sound when the alarm is present, disabled means never sound, and muted means the sound
           is temporarily disabled until the alarm would normally stop sounding. In the muted state, the beeper
           is automatically turned back on at the next event (AC failure, battery test, etc). Also, the beeper
           can’t be turned off during a critical event (low battery). Note that not all UPS models support the
           "disabled" state.

       ups.firmware, ups.load, ups.model, ups.power.nominal
           e.g. 800 for an 800VA system

       ups.status
           a list of flags; see the status flags below.

       ups.temperature
           not supported by all hardware.

       ups.test.result, ups.delay.restart
           time to restart (read only)

       ups.delay.shutdown
           time to shutdown (read only). This is always a multiple of 60 seconds.

       ups.type
           ONLINE/OFFLINE/LINEINT. This describes the basic layout of this UPS (for GUI clients which want to
           draw an animated picture of power flow). An offline UPS has a direct connection from AC input to AC
           output, and also a connection from AC input to the battery, and from the battery to AC output. An
           online UPS lacks the direct connection from AC input to AC output, whereas a line interactive UPS
           lacks the connection from AC input to the battery.

COMMANDS

       beeper.enable, beeper.disable, beeper.mute
           Enable, disable or mute the panel beeper. Note that if the beeper is muted, it is automatically
           turned back on at the next event (AC failure, battery test, etc). Also, the beeper can’t be turned
           muted during a critical event (low battery).

       reset.input.minmax
           Reset the variables input.voltage.minimum and input.voltage.maximum.

       shutdown.reboot
           Shut down load immediately for about 1—2 minutes.

       shutdown.reboot.graceful
           After 40 second delay, shut down load for about 1—2 minutes.

       shutdown.stayoff
           Shut down load immediately and stay off. The only way it can be turned back on is by manually
           pressing the front panel button.

       test.battery.start, test.battery.stop
           Start/stop 10 second battery test.

       test.failure.start, test.failure.stop
           Start/stop "deep" battery test.

STATUS FLAGS

       OB
           load is on battery, including during tests

       OFF
           load is off

       OL
           load is online

       ACFAIL
           AC failure. Note that this refers to the AC input, and thus it is not the same as "OB". An AC failure
           can occur at any time, for instance, during a battery test, or when the UPS load is off.

       OVER
           overload

       OVERHEAT
           overheat

       COMMFAULT
           UPS fault

       LB
           low battery

       CHRG
           charging

       DEPLETED
           the battery is depleted. When the UPS raises this flag, it simultaneously switches off the load.

       RB
           replace battery

EXAMPLES

       Here is an example for how belkinunv should be used in a computer’s shutdown script. These commands
       should go in the very last part of the shutdown script, after all file systems have been mounted
       read-only, and just before the computer halts. Note that belkinunv must be installed in a directory which
       is still readable at that point.

           # NEAR END OF SHUTDOWN SCRIPT:
           # if shutdown was caused by UPS, perform Belkin UPS workaround.
           if [ -f /etc/killpower ] ; then
              echo "Waiting for AC power, or for UPS batteries to run out..."
              /usr/bin/belkinunv -x wait /dev/ttyS1

              # we get here if the power came back on. Reboot.
              echo "Power is back. Rebooting..."
              reboot
           fi

       And here is an example of how to use belkinunv in the startup script. These commands should go near the
       beginning of the startup script, before any file systems are mounted read/write, and before any file
       system integrity checks are done.

           # NEAR BEGINNING OF STARTUP SCRIPT:
           # if we are recovering from a power failure, wait for the UPS to
           # charge to a comfortable level before writing anything to disk
           if [ -f /etc/killpower ] ; then
              echo "Waiting for UPS battery charge to reach 60%..."
              /usr/bin/belkinunv -x wait=60 -x nohang /dev/ttyS1
           fi

EXIT STATUS

       When used normally, belkinunv forks into the background and its diagnostics are the same as for all NUT
       drivers, see nutupsdrv(8).

       When used with the -x wait option, the exit status is normally 0. If the -x nohang option has also been
       specified, an exit status of 1 indicates that communication with the UPS was lost. If the -x flash option
       has been specified, an exit status of 2 indicates that the timed shutdown has failed.

EXTRA ARGUMENTS

       This driver does not support any extra settings in ups.conf(5).

SEE ALSO

   The core driver:
       nutupsdrv(8)

   Internet resources:
       •   The NUT (Network UPS Tools) home page: http://www.networkupstools.org/

       •   The documentation for the protocol used by this UPS: belkin-universal-ups.html

AUTHOR

       Peter Selinger <selinger@users.sourceforge.net>