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9 pin D-SUB male connector layout
9 pin D-SUB male connector
APC Part# 940-0119A
UPS Pin PC Pin Description
1 4 and 6  DSR DTR, Shutdown when set by computer for 1-5 seconds
2 8 and 9   RI CTS, On battery power
3 1 and 2  CD RxD, Low battery
4 Ground
5 RTS, Begin signalling on other pins
6    
9 pin D-SUB female connector layout
9 pin D-SUB female connector
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APC BackUPS Office (old) cable visual pinout:click to enlarge
Source(s) of this and additional information: www.apcupsd.com
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