UPS - Question
I just bought an MG Pulsar Ellipse 650S (S is for serial) and I'm
trying to make it work with my Linux.
This UPS model includes a cable, which has a 9-pin serial connector on
the side that connects to the computer, and some connector that looks
much like an RJ-45 on the side that connects to the UPS. Since the
Windows 2000 machine which I first tested the UPS on was able to
correctly detect when the power was off, I assume the connections are
okay.
My machine uses a Debian distribution, so I want to avoid using
mgeupsd since there is no debian package for it yet. Therefore what I
am trying to do is use a generic tool such as powerd, upsd or
genpower, or my own little Perl script to use the UPS in dumb mode,
but still I would need to know what happens to the serial connection
when the power is turned off or on.
So I started by running "statserial" to monitor the serial port.
statserial /dev/ttyS1 returns the following, which doesn't change when
I turn the power on or off:
Device: /dev/ttyS1
Signal Pin Pin Direction Status Full
Name (25) (9) (computer) Name
----- --- --- --------- ------ -----
FG 1 - - - Frame Ground
TxD 2 3 out - Transmit Data
RxD 3 2 in - Receive Data
RTS 4 7 out 1 Request To Send
CTS 5 8 in 1 Clear To Send
DSR 6 6 in 1 Data Set Ready
GND 7 5 - - Signal Ground
DCD 8 1 in 0 Data Carrier Detect
DTR 20 4 out 1 Data Terminal Ready
RI 22 9 in 0 Ring Indicator
While statserial was running, I ran "gentest" (of the genpower
package) with different settings, setting or clearing different
combinations of the DTR and RTS bits each time. Neither of the four
combinations would make the output of setserial dependent on the power
status of the main plug.
Based on the UPS HOWTO, I am under the impression that this experiment
would have provided me with more useful results if I were using a
different UPS. I wonder whether I'm doing something wrong, whether I
should be doing something differently or if it is impossible to have
an MGE Pulsar Ellipse UPS run in dumb mode.
Any help will be very much appreciated.
Thanks,
- Alexander Karelas
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