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statepint
2012 Feb 26
1
Server Does Not Shut Down
...e AC present and low battery to work properly. It uses a standard serial port with simple relay switching.
I made a simple device to apply either +12 or -12volts to both pin 1(DCD) and pin 8 (CTS) to help me understand the correct handshake but I am very confused.
Here is a table of what I get:
StatePin 1Pin 9Note?What I understand it means
1+12V+12VOLOn Line -?normal operation.
2-12V+12VLB OLI don't understand this. It should be On Battery.
3+12V-12VOBI thought this should be Low Battery.
4-12V-12VOLI thought the server should shut down?
Note: results of running:
/usr/local/ups/bin/upsc sdru...