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3110 User's Guide S LTM-XXXX A Draft 03/01/2001
C H A P T E R 2
FEATURES
This section covers:
S Using the communication port
S Starting the UPS on battery
Communication Port
Powerware Corporation offers an accessory interface kit that allows you
to connect many types of computer systems to the UPS communication
port. For specific information on Powerware Corporation interface kits,
call your service representative.
Pinouts
Contacts consist of open collector circuits capable of switching up to
+30 Vdc, 6 mA resistive load.
Table 1. Communication Port Pin Assignment
Pin Signal Type Function
1 RS-232 Level Shutdown +12 Vdc signal held for 5 seconds on this pin shuts the UPS
down 120 seconds later. The UPS restarts after 15 seconds
when utility power returns.
2 Not Used Not Used
3 Normally Open On-Battery Contact A normally open contact that closes 15 seconds (pulls to
Common) after the UPS switches to battery power.
4 Common The signal ground for all signal pins.
5 Normally Open Low-Battery-Alarm Contact A normally open contact that closes (pulls to Common)
during a Low Battery Alarm.
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.
7 Not Used Not Used
8 Normally Closed On-Battery Contact A normally closed contact that opens 15 seconds (releases
from Common) after the UPS switches to battery power.
9 Not Used Not Used