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APC Smart UPS interface port

pinout

9 pin D-SUB female
9 pin D-SUB female connector  at the UPS
PinSignalDescription
1Shut Down RS232 In or Smart mode RS-232 RX InSet high for 4.5sec to activate shutdown?
2Line Fail RS-232 Out or Smart mode RS-232 TX Out 
3Line Fail signalNormally not shorted to GND
4,9GNDGround, chassis
5Low battery signalNormally not shorted to GND
6Line fail signalNormally shorted to GND
7UPS Turn-on/off signal 
8Unregulated +24 Vdc Out 

Source:www.pinouts.ru


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