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Communication Port
Best Power offers an accessory interface kit that allows you to connect many types of computer
systems to the Patriot’s communication port. The operating systems include: Windows v3.1x, 95,
98, NT, OS/2, Client, Novell NetWare, and many versions of UNIX, using CheckUPS Basic
software included with each kit. For specific information on Best Power interface kits, call Best
Power’s Worldwide Service or your local Best Power dealer.
Pinouts
Pin 1
RS232 Level Shutdown: +12 VDC signal held for 5 seconds on this pin shuts Patriot
down 120 seconds later. The UPS restarts after 15 seconds when utility power returns.
Pin 2
Unused.
Pin 3
Normally Open On-Battery Contact: A normally open contact that closes 15 seconds
(pulls to Common) after the UPS switches to battery power.
Pin 4
Common: The signal ground for all signal pins.
Pin 5
Normally Open Low-Battery-Alarm Contact: A normally open contact that closes
(pulls to Common) during a Low Battery Alarm.
Pin 6
Normally Closed Low-Battery-Alarm Contact: A normally closed contact that opens
(releases from Common) during a Low Battery Alarm. This tells some shutdown
software when to start a computer shutdown.
Pin 7
Unused.
Pin 8
Normally Closed On-Battery Contact: A normally closed contact that opens
15 seconds (releases from Common) after the UPS switches to battery power.
Pin 9
Unused.
Contacts consist of open collector circuits capable of switching up to +30 VDC, 6 mA resistive
load.
Cold-start Feature
The Patriot will turn on and produce output voltage (cold start) without an input power source (if
the battery is charged). The cold-start range is up to about 40% of nominal input. Voltages above
the cold-start range but more than about 20% either side of nominal keep the Patriot from being
turned on. This condition is an input voltage fault: the red Fault LED lights and the audible alarm
beeps.
If the Patriot is operating in normal line-mode operation, it automatically switches to inverter-
mode operation when the input voltage increases or decreases into the input voltage fault range.