A trial of OpenBSD/amd64 with OMRON UPS BY35S, using nut (Network UPS Tools; http://www.networkupstools.org/).

openbsd-nut-omron-ups

% sudo /usr/local/bin/blazer_usb -DDDDD -a by35s
Network UPS Tools - Megatec/Q1 protocol USB driver 0.09 (2.6.5)
   0.000000     send_to_all: SETINFO driver.parameter.port "auto"
   0.000084     send_to_all: SETINFO driver.parameter.vendorid "0590"
   0.000096     send_to_all: SETINFO driver.parameter.productid "0080"
   0.000108     send_to_all: SETINFO driver.parameter.subdriver "ippon"
   0.000148     debug level is '5'
   0.000740     No appropriate HID device found
   0.000763     No supported devices found. Please check your device availability with 'lsusb'
and make sure you have an up-to-date version of NUT. If this does not help,
try running the driver with at least 'subdriver', 'vendorid' and 'productid'
options specified. Please refer to the man page for details about these options
(man 8 blazer).

openbsd-nut-omron-ups-2

% sudo ./blazer_usb -DDDD -a by35s

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

Password:
Network UPS Tools - Megatec/Q1 protocol USB driver 0.09 (2.6.5)
   0.000000     debug level is '4'
   0.170689     Checking device (10DE/0000) (000/001)
   0.171042     - VendorID: 10de
   0.171050     - ProductID: 0000
   0.171057     - Manufacturer: NVIDIA
   0.171064     - Product: EHCI root hub
   0.171070     - Serial Number: unknown
   0.171076     - Bus: 000
   0.171083     Trying to match device
   0.171098     Device does not match - skipping
   0.171138     Checking device (10DE/0000) (001/001)
   0.171215     - VendorID: 10de
   0.171223     - ProductID: 0000
   0.171229     - Manufacturer: NVIDIA
   0.171235     - Product: OHCI root hub
   0.171242     - Serial Number: unknown
   0.171248     - Bus: 001
   0.171254     Trying to match device
   0.171262     Device does not match - skipping
   0.171281     Checking device (1774/1001) (001/002)
   0.178683     - VendorID: 1774
   0.178790     - ProductID: 1001
   0.178797     - Manufacturer: Strawberry Linux Co.,Ltd.
   0.178803     - Product: unknown
   0.178810     - Serial Number: unknown
   0.178816     - Bus: 001
   0.178822     Trying to match device
   0.178831     Device does not match - skipping
   0.178854     Checking device (056E/5004) (001/003)
   0.186673     - VendorID: 056e
   0.186777     - ProductID: 5004
   0.186784     - Manufacturer: Prolific Technology Inc.
   0.186791     - Product: USB-Serial Controller
   0.186797     - Serial Number: unknown
   0.186804     - Bus: 001
   0.186810     Trying to match device
   0.186819     Device does not match - skipping
   0.186840     Checking device (0590/0080) (001/004)
   0.204672     - VendorID: 0590
   0.204781     - ProductID: 0080
   0.204788     - Manufacturer: OMRON
   0.204795     - Product: BY35S
   0.204801     - Serial Number: unknown
   0.204807     - Bus: 001
   0.204814     Trying to match device
   0.204830     Device matches
   0.207703     Trying megatec protocol...
   0.210685     send: Q1
   0.265673     read: (103.8 1
   0.265774     blazer_status: short reply
   0.265782     Status read 1 failed
   0.458659     send: Q1
   0.458773     read: 01.2 104.0 030 60.0 13.6 43.4 00101000
   0.458782     blazer_status: invalid start character [30]
   0.458789     Status read 2 failed