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990-4053
Installation Guide APC Silcon 480kW 400V UPS 27
UPS Shut Down RS-232 Input or
Advanced Mode RS-232 Data RX In
Line Fail RS-232 Output or
Advanced Mode RS-232 Data TX Out
Unregulated
+24 VDC Output
Normally Open
Line Fail Signal
Normally Open
Low Battery Signal
Normally Closed
Line Fail Signal
Common
Chassis