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pinout (распиновка)

APC Back-UPS Cable (PN 940-0020B) pinout

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9 pin D-SUB MALE connector  to the UPS
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
Signal Name
N/C 1  N/A
N/C 2  N/A
N/C 3  N/A
1 4  Data Terminal Ready
4,9 5  Signal Ground*
N/C 6  N/A
N/C 7  N/A
2 8  Clear To Send
N/C  N/A

9 pin D-SUB FEMALE connector  to the computer

* There are two different configuration, one in which both 4 and 9 on the male end are connected to 5 on the female end, and one in which only 4 on the male end is connected to 5 on the male end.