Então eu tenho esse no-break conectado à máquina com um cabo RS232 / USB.
ups.conf
contém
[apc1]
driver = apcsmart
port = /dev/ttyUSB0
desc = "APC USB"
E recebo a seguinte saída:
$ sudo upsdrvctl start
Network UPS Tools - UPS driver controller 2.7.1
Network UPS Tools - APC Smart protocol driver 3.1 (2.7.1)
APC command table version 3.1
very old or unknown APC model, support will be limited