This post was written by on January 14, 2010 Posted Under:, Introduction I have an old Mustek 600VA UPS with RS-232 connection. Since I change the battery every couple of years on my own, I find it pretty pointless to throw it away. And my brand new computer (running Fedora 12) has an RS-232 port if one insists to use a connector on the motherboard. Needless to say, I had to steal the RS-232 cable from motherboard to panel from an old computer. Diskografiyu skrillex njhtyn. A simple male/female extension RS-232 cable connects between UPS and computer. PC to UPS communication goes through pin 3, and the other direction through pin 2.

The cable should be completely transparent (i.e. Not switch wires, in particular not pins 2 and 3). In case you want to see if the UPS is alive with Putty (or some other terminal), go for 2400 baud, 8N1 (8 bits, no flow control and one stop bit).

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Type Q1 followed by a carriage return, and the UPS should respond with a line of status info. The protocol is described. Linux driver The right driver to run with the UPS is the, or nut for short. # yum install nut Configure the UPS.

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# vi /etc/ups/ups.conf Basically, add the following entry: [PowerMust] driver = megatec port=/dev/ttyS0 desc = 'Mustek PowerMust 600VA' mfr = 'Mustek' model = 'PowerMust 600' Now we can kick off the driver which listens to the UPS (the response takes a few seconds): # upsdrvctl start Network UPS Tools - UPS driver controller 2.4.1 Network UPS Tools - Megatec protocol driver 1.6 (2.4.1) Megatec protocol UPS detected. If you happen to have an oscilloscope on the RS-232 lines (ha!), you should see some action every few seconds from now on. Or, alternatively, if you want to see what’s running on the computer, I suggest # ps aux grep nut It so happens, that during the installation, we got a new user, named “nut” under which most of the relevant processes are running.

A process running /sbin/megatec should be found there. Configure the monitor # vi /etc/ups/upsmon.conf Basically, there’s only one line to add (pretty much at the beginning): MONITOR PowerMust@localhost 1 upsmon pass master I’ve chosen to configure the monitor as master, since the I plan to put some virtualization guests, which may work as slaves. As for the “upsmon” and “pass”, these are user and password when connecting to upsd. Since no user nor password were configured in upsd.users, the attempt to login will fail, resulting in error messages when the monitor is started. Now let’s test it. First, let’s remove the already running daemons: # service ups stop Stopping UPS monitor: [FAILED] Stopping upsd: [ OK ] Shutting down upsdrvctl: [ OK ] Stopping the UPS monitor failed, because it wasn’t running.

And not kick it off: # service ups start Starting UPS driver controller: [ OK ] Starting upsd: [ OK ] Starting UPS monitor (master): [ OK ] # ps aux grep nut nut 6578 0.0 0.0 6084 468? Ss 02:51 0:00 /sbin/megatec -a PowerMust nut 6582 0.0 0.0 40552 624? Ss 02:51 0:00 /usr/sbin/upsd nut 6586 0.0 0.0 38364 856?