Powerware Ferrups FE/QFE UPS User Manual page 54

Communication
To restart the UPS, break the connection between Pins 6 and 21 (or
between Pins 18 and 21) at the UPS's RS-232 port. Then, follow the
steps in "Startup" on page 17 for your model. Note that the 12V level on
Pin 6 or Pin 18 is only available when the UPS is operating.
You can change the type of signal that the UPS responds to and how
quickly it responds. You can also set up the UPS to restart automatically
when the shutdown signal stops. See TIP 503 or contact your service
representative for more information.
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Powerware ® FERRUPS FE/QFE UPS (500 VA–18 kVA) User's Guide Rev A www.powerware.com