NUT - Serial to USB

[speeddragon]

Hi,

I have mounted a system with Alix 2D13 with pfSense after a one year using a normal PC.

I'm trying to get UPS information (Mustek 800VA) using Serial->USB cable, but i can't get this work.

The USB is recognized:

ugen0.2: <prolific technology="" inc.=""> at usbus0
uplcom0: <prolific 0="" 2="" technology="" inc.="" usb="" 2.0="" to="" com="" device,="" class="" 0,="" rev="" 1.10="" 3.00,="" addr=""> on usbus0</prolific></prolific>

And a new terminal is created (/dev/ttyU0).

But when i try to start NUT this error appears:

/usr/local/etc/rc.d/nut.sh start
stopping megatec
Network UPS Tools - UPS driver controller 2.2.2
Can't open /var/db/nut/megatec-ttyU0.pid: No such file or directory
forcing megatec termination
starting megatec
Network UPS Tools - UPS driver controller 2.2.2
Network UPS Tools 2.2.2 - Megatec protocol driver 1.5.14 [megatec]
Carlos Rodrigues (c) 2003-2008

Megatec protocol UPS not detected.
Startup timer elapsed, continuing...
megatec failed to start

The ups.conf is the follow:

user=root
[Mustek800VA]
driver=megatec
port=/dev/ttyU0

Can anyone help me?

Thanks