[Nut-upsuser] can't get UPSDRV to see serial port

[Rich Osman]

First, a little history; nut has been working on this system for about 
two years. It was a Fedora Core 2 (3?) system that I wiped and installed 
SUSE 10.1 on so I'm fairly confident of the hardware.  I thought I'd 
saved the nut configuration details before I did the reinstall, but 
can't find them. (D'oh!)

The UPS is an APC BackUPS Pro 420. The cable is a clone of the APC 
940-0024C 'smart' cable and matches the pinout on the nut site.

I've created a user and group of 'ups' and set ports and permissions as 
outlined in the install doc. 

I've configged for a user of  'ups' and all the makes were generally 
clean, though some warnings were given about unreferenced variables and 
pointer 'signedness' .  I'm not thrilled about this but see too much of 
it. Make exits with a level of 0.

The chmod and chown in the install directions terminate without 
comment.  The UPS is on com1/ttys0, though I've tried ttys1 just to see 
what changes and nothing does.  I've also tried running it all as root 
as a test.

The salient part of my ups.conf is:

    ________________________________
    # Network UPS Tools: ups.conf

    user = ups

    [bup420]
        driver = apcsmart
        port = /dev/ttys0
        desc = "Local UPS"
    ________________________________

I'm (always) getting the message

        
_________________________________________________________________________


    /NUT UPS Tools/nut-2.0.4 # /usr/local/ups/bin/upsdrvctl start
    Network UPS Tools - UPS driver controller 2.0.4
    Network UPS Tools (version 2.0.4) - APC Smart protocol driver
            Driver version 1.99.8, command table version 2.0

    Unable to open /dev/ttys0: Input/output error

      Current user id: ups (500)
    Serial port owner: ups (500)
    Serial port group: ups (500)
         Mode of port: 0600

    Things to try:

     - Use another port (with the right permissions)

     - Fix the port owner/group or permissions on this port

     - Run this driver as another user (upsdrvctl -u or 'user=...' in
    ups.conf).
       See upsdrvctl(8) and ups.conf(5).

    Fatal error: unusable configuration
    Driver failed to start (exit status=1)

_________________________________________________________________________


    Clearly I'm missing something, but I'm out of ideas as to what to try.