NAME

       liebert-esp2 - Driver for Liebert UPS, using the ESP-II serial protocol

SYNOPSIS

       liebert-esp2 -h

       liebert-esp2 -a UPS_NAME [OPTIONS]

           Note

           This man page only documents the hardware-specific features of the liebert-esp2 driver. For
           information about the core driver, see nutupsdrv(8).

SPECIAL CABLING NOTE

       Be aware that an RS-232 cable with ONLY the RX, TX and ground pin must be used when interfacing with GXT2
       series UPS units (and possibly others), since the handshaking lines are used for purposes other than
       RS-232 flow control.

       Use of a standard RS-232 cable with full handshaking may result in undesired operation and/or shutdown.
       It is therefore advisable to confirm the proper cable/wiring with the diagram provided in the manual with
       your UPS.

SUPPORTED HARDWARE

       Tested to work on the following units:

       •   Liebert GXT2-6000RT208

       This is an experimental driver. You have been warned.

       This driver currently does not support modification of configuration parameters, such as the low battery
       warning time and automatic restart policy.

EXTRA ARGUMENTS

       This driver supports the following optional settings in ups.conf(5):

       baudrate=num
           Set the speed of the serial connection — 1200, 2400 (default), 4800, 9600 or 19200.

AUTHORS

       •   Richard Gregory <R.Gregory at liverpool.ac.uk>

       •   Arjen de Korte <adkorte-guest at alioth.debian.org>

       •   Nash Kaminski <nashkaminski at kaminski.io>

SEE ALSO

   The core driver:
       nutupsdrv(8)

   Internet resources:
       The NUT (Network UPS Tools) home page: https://www.networkupstools.org/historic/v2.8.3/

Network UPS Tools 2.8.3                            07/08/2025                                    LIEBERT-ESP2(8)