Users Manual & Installation Guide
PV- 5127: Power supply module with UPS
Page 24 of 31
It can be illustrated like this:
• The state machine starts up in SOFT_TEMPBAD when the main DC/DC converter starts.
In this state, the 5V+12V cannot be turned on. It stays in this state as long as the system
temperature is too cold or too hot.
• SOFT_ON: This is the normal “on” state. The RS232 DTR (Shutdown) is monitored, and if
it is active for one second, power is turned off by going to SOFT_OFF. Pulses on DTR
shorter than one second are ignored. In SOFT_ON, the CPU can issue a delayed shutdown
command through the PC/104 bus.
• SOFT_DELAY: The 5V+12V is still on, but the delayed shutdown timer is running. The
delay can be cancelled by software, returning to SOFT_ON.
• SOFT_OFF: The 5V+12V is turned off for two seconds, ensuring that the CPU is cleanly
rebooted after it has decided to shut down, even if mains is present. If mains isn’t present,
the main DC/DC converter is also turned off, so everything stays off until mains comes
back.
• SOFT_TEMPBAD: If mains is present, it moves from SOFT_OFF to SOFT_TEMPBAD
after two seconds. If the system temperature is OK (cool or warm), it then moves
immediately to SOFT_ON. If the system temperature is either too cold or too hot, it stays in
SOFT_TEMPBAD until either the temperature becomes OK, or mains disappears (whereby
everything is turned off until mains comes back).
Note that the PV-5127 does not have a very accurate clock. You should expect deviations of ±10%
from the nominal times in SOFT_DELAY and SOFT_OFF.
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