ETA Systems 420VA Guide De L'utilisateur page 12

ETA Systems ® - SECURITY ONE UNINTERRUPTIBLE POWER MANAGER
Broadcast warnings of power failures/timed shutdowns
Automatic closure of files prior to battery exhaustion
Power down of the UPM and connected equipment
To support these functions without the Communications Manager software suite, you will need to either buy
or build your own special cable. The following table describes the pin assignment of the DB9 connector on
the rear of the UPM. Contact your computer supplier to determine the connection
configuration and connector style necessary to attach the cable to the computer.
Pin #
1
Reserved
2
UPM simulates a relay closing between Pins 2 and 4 when
input power fails
3
Reserved
4
Common Ground
5
UPM simulates a relay closing when battery has less than 2
minutes runtime remaining*
6
UPM sends a RS232 high (12V) for 1 second after input
power fails (normally low). Also functions as receive data.
7
Common Ground
8
Reserved
9
RS232 transmit data
* Load Dependent
Notes:
1. Pins 1, 2, and 5 are open collector outputs, which must be pulled up to a common referenced supply.
Switch rating: +40V, 0.15A non-inductive.
2. Pins 4 and 7 should only be connected to ground.
Important Note: You may, of course, connect your computer to the UPM without using
Communications Manager. When power is lost, the UPM will beep and you will have to
manually shut down the computer and UPM.
Description
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