The power monitor consists of hardware and software working together to ensure data integrity on the hard disk by automatically shutting the system down in the event of a prolonged power failure.
The device requires the use of a serial port and works in conjunction with a
UPS (uninterrupted power supply).
 

TECHNICAL SPECIFICATIONS: (Click here)

FEATURES: - Maintains a log of date and time of power failures. - Sends electronic mail to the system administrator in the event of   a system shutdown. - Power monitor can be enabled or disabled or setup changed while   system is running. - File system corruption's do not occur as the system is shut down in an      orderly fashion. - The power monitors optically coupled to the mains and this ensures   that the system and deice are resistant to lightning. - Users are warned every minute of the impending shutdown if a power   failure occurs. - Should the power recover before the specified battery life then the     shutdown is aborted and the users are informed. - Power failure and battery low conditions are monitored. INSTALLATION INSTRUCTIONS HARDWARE: - The device will connect to any stanard 25 pin D-type RS232 connector,     whether male or female, DCE or DTE. - Should the machine not use 25 pin connectors a terminal type fly-lead is     required. - The power monitor is connected to a spare serial port on the unix/xenix     system. - The mains plug is connected to the mains supplying the UPS, not the     output from the UPS so that we can monitor the raw mains supply. Note     which serial port the device is connected to e.g./dev/tty1A SOFTWARE: - Data Safe is supplied on a 1.2Mb floppy and a 1,44Mb stiffy in UNIX 'tar'    format. - Log in as root and at the #prompt enter the following command. - For a 1.44Mb stiffy type as follows: #cd / ; tar xvf /dev/fd0135ds18   This will extract the following files: /etc/power.ok - (Executable that checks for power failure) /etc/power_down - (System shutdown script without questions) /etc/power_fail - (Sends messages to users during power failure) /etc/power_admin - (ADMINISTRATION and INSTALLATION script) It is IMPORTANT to disable     any logins or other processes running on the port as this could conflict     with the power monitor. - The power_down must be modified for unix systems to contain only "init 0"   as the script supplied is for Xenix environments. - #disable tty1A;disabletty1a# Will disable the port in this example. - #power_admin # Runs the installation script. - Option 3 requires the name of the serial port eg./dev/tty/1A and the delay   in minutes eg. 10 before a shutdown must take place. - The delay should be well within the expected battery discharge time. - The power monitor is started automatically when the operating system is   started up. - (A line is added to the end of /etc/rc) Any changes to the power monitor    setup will come into effect immediately. - THE POWER MONITOR CAN BE TESTED by switching off the mains power     to the UPS. The system will broadcast a message to all users every   minute indicating a power failure has occured and how much time remains. - At this point the users should finish off and log off. - If the power is reapplied to the UPS the power monitor will abort the    shutdown. If the power remains down then the software will shut the     system down normally when the time limit is exceeded or alternatively    when the battery low condition takes place. * Make sure that cable is connected correctly as per suppliers instruction.