If your read the help page for the driver:
/lib/nut/powercom -h

You will find that:
You must specify type in ups.conf
Type of UPS like ‘Trust’, ‘Egys’, ‘KP625AP’, ‘IMP’, ‘KIN’ or ‘BNT’ or ‘BNT-other’ (default: ‘Trust’)
BNT-other – it’s a special type for BNT 100-120V models

ttyS0 is showing locked. ttyS1 received data -1 instead of 11 which driving me crazy!

UPS is powercom, OS ubuntu, Server IBM Netfinity 5600

Pleased to hear

I got stalled at the “upsdrvctl start” step: it would not detect my UPS’s existence. My UPS is connected over USB, with the parameters:
(ups.conf)
[belkin]
driver=newhidups
port=auto

The problem turned out to be that the newhidups driver did not have sufficient permissions to read and write the device node that corresponded to the UPS. I have a 2.6 kernel, so this just means I needed to write a udev rule. The Ubuntu nut package automatically adds a file to /etc/udev/rules.d/, but my UPS was not detected by the rules in that file. So I added the following line to it:

SYSFS{product}==”Belkin UPS”, SYSFS{idProduct}==”0751″, SYSFS{version}==” 1.10″,
RUN+=”/etc/hotplug/usb/libhidups”

That hotplug script simply changes the ownership of the device node. Then everything worked, after I unplugged and plugged in the USB cable.

I figured out the SYSFS{..} rules using the lsusb program and the udevinfo program. The former is pretty self-explanatory, the latter is described in the “writing udev rules” link above.

By the way, another hard to figure out piece of excitement is that the “usbhid-ups” and “newhidups” drivers are really the same thing, and if someone tells you to use one but you only have the other, try the other.

Hope this helps someone!
tgs at dont resc spamme dot net

may ask something?
i have only 1 pc running ubuntu with nut properly configured. if ups switch to battery when my pc is shutdown ? when battery is low? or immediately ?
it’s possible to configure the monitor like that: “after 15 min of battery mode shutdown immediately”

TNX