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mge-shut - Man Page

Driver for SHUT Protocol UPS equipment


mge-shut -h

mge-shut -a UPS_NAME [OPTIONS]


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

Supported Hardware

mge-shut supports all recent Eaton, MGE and Dell UPS models which use the SHUT (Serial HID UPS Transfer) protocol.

Older MGE models, such as Pulsar ESV+, Pulsar EX and Pulsar ES+, use the U-Talk protocol and should use the mge-utalk driver.

Extra Arguments

This driver also supports the following optional settings:


Set the low battery warning threshold at which shutdown is initiated by upsmon(8).

The factory default value is 30 (in percent), and can be settable depending on the exact model.


Set the timer before the UPS is turned off after the kill power command is sent (via the -k switch).

The default value is 20 (in seconds). Usually this must be lower than ondelay, but the driver will not warn you upon startup if it isn’t.


Set the timer for the UPS to switch on in case the power returns after the kill power command had been sent but before the actual switch off. This ensures the machines connected to the UPS are, in all cases, rebooted after a power failure.

The default value is 30 (in seconds). Usually this must be greater than offdelay, but the driver will not warn you upon startup if it isn’t. Some UPSes will restart no matter what, even if the power is (still) out at the moment this timer elapses. In that case, you could try if setting ondelay = -1 in ups.conf helps.

ondelay parameter was set in ten seconds unit in the legacy mge-shut driver ( 3 for 30 seconds) . It is now set in seconds ( 30 for 30 seconds). Make sure you use the correct unit in your configuration.


Set notification type to 1 (no), 2 (light) or 3 (yes).

This argument is ignored. It is only here for backward compatibility.

Known Issues

Repetitive timeout and staleness

Some models tends to be unresponsive with the default polling frequency. The result is that you have some "data stale" errors in your system log.

In this case, simply modify the general parameter "pollinterval" to a higher value (like 10 for 10 seconds). This should solve the issue.

Using notification=3 might also help.


Arnaud Quette

See Also

The core driver


Internet resources

The NUT (Network UPS Tools) home page: https://www.networkupstools.org/

Referenced By

nutupsdrv(8), upsd(8).

07/03/2024 Network UPS Tools 2.8.2. NUT Manual