These are the related apcupsd.conf parameters for a Linux server connected via serial cable (APC #940-0020B) to an APC ShareUPS device.
UPSNAME APC
UPSCABLE 940-0020B
UPSTYPE dumb
DEVICE /dev/ttyS0
UPSCLASS standalone
UPSMODE disable
Hope this saves some time for someone.
Yours,
Buanzo.