Users Manual & Installation Guide
PV- 5127:
Power supply module with UPS
Page 16 of 31
RS232 Status signals
The
Battery low
and
Mains failure
signals together can tell three different states:
Mains failure
Battery low Status
0
0
Running normally on mains power.
1
0
Mains alarm, running on battery. The CPU is advised to shut down if
mains power doesn’t come back within reasonable time. This time
should be configured in the UPS monitoring software.
1
1
Critical alarm. The CPU is advised to shut down immediately.
This happens in two situations:
•
During mains failure and the battery is critically low.
•
When the system is
too hot
.
RS232 Shutdown signal
When the CPU activates the Shutdown signal for one second, the PV-5127 immediately turns off
the +5V and +12V power, and, if mains is not present, also the +5V STB. Pulses shorter than one
second have no effect. For details, please see the section
ATX and Softoff state machines
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