LEDE and NUT support

Hi all!
I'm trying to use nut ups support and experiencing some problems with it. Due to no any manuals about LEDE ups support it was configured manually (but it's totally different with OpenWRT nut configuration), in file /etc/config/nut_server, i't look like:
config driver 'ups'
option driver nutdrv_qx
option port auto

config user
option username admin
option password 12345
option actions SET
list instcmd all

config listen_address
option address
option port 3493

config upsd 'upsd'
option statepath /var/run/nut

Both /etc/init.d/nut-server and upsdrvctrl start was starting successfully, but driver was not connecting to UPS (it was really connected):
root@Router7:/etc/init.d# lsusb
Bus 002 Device 006: ID 0665:5161 Cypress Semiconductor USB to Serial

Connection process was:
root@Router7:/etc/init.d# upsdrvctl stop
Network UPS Tools - UPS driver controller 2.7.4
root@Router7:/etc/init.d# upsdrvctl start
Network UPS Tools - UPS driver controller 2.7.4
Network UPS Tools - Generic Q* USB driver 0.28 (2.7.4)
USB communication driver 0.33
Using protocol: Voltronic-QS 0.07
No values for battery high/low voltages
Using 'guesstimation' (low: 10.400000, high: 13.000000)!
Battery runtime will not be calculated (runtimecal not set)
root@Router7:/etc/init.d# upsc ups
Error: Driver not connected

Have you any ideas for fix it?

P.S. - same UPS can be connected to Ubuntu PC with same NUT software and equal configuration and driver.