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- The UPS monitor daemon or "upsd" watches the serial port
- connected to an UPS and will perform an unattended shutdown
- of the system if the UPS is on battery longer than a specified
- number of minutes. Upsd needs to watch a tty with modem control
- properties, and expects the UPS to raise DCD when it switches
- to battery backup and drop DCD when it goes back to online.
- Upsd was developed and tested under ISC with the FAS 2.08 driver
- and an American Power Conversion SmartUPS 600, your milage may
- vary on other OSes and UPSes.
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