liebert - Driver for Liebert contact-closure UPS equipment
This man page only documents the hardware-specific features of the
liebert driver. For information about the core driver, see
This driver supports some Liebert UPS equipment with a contact-closure
interface. This includes the UPStation GXT2 with their contact-closure
cable. The smart mode ("Multilink") cable is not supported by this
This driver does not support any extra settings in the ups.conf(5).
This driver does not yet support shutdowns by raising DTR. Be aware
that shutdowns are not possible with the stock contact-closure cable.
You may have to build another cable with DTR connected through to the
UPS for it to work.
There is no way for this driver to detect the hardware or cable. It
will start up successfully even if no UPS is present. This is a
fundamental limitation of any contact-closure driver.
Since the TX and RX signals are only used to detect loopback (when the
contacts close), the baud rate should not matter. However, it is
hardcoded to 9600 baud to prevent problems with noise if the port
defaults to a higher baud rate.
The core driver:
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
Wed Jul 28 2009