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9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the UPS
9 pin D-SUB female connector layout
9 pin D-SUB female connector
at the computer
APC Part# 940-0095B. Should work with APC PowerChute Pro software.
UPS
Signal Name		 DB-9 Male
(UPS end)		 DB-9 Female
(PC end)		 PC
Signal Name
RX / Shutdown 1 via R=4k to 3 TxD, also connected via R=4kOhm to pin 1 (DCD)
TX / AC Fail 2 2,9 RxD, RI
Common 4,9 5 GND

At the PC end pins 4,6,8 (DTR, CTS, DSR) shorted.

1-----------------^^^--------------3
                   R     -----^^^--1
                                R
2-----------------------------------2 and 9 (shorted)

4----
      |---------------------------- 5
9----/                           
                                    4 and 8 and 6 (shorted)
R=4KOhm.

Another variant:

Signal Computer                  UPS
            DB9F                     DB9M
      DTR    4   ----*
      CTS    8   ----|
      DSR    6   ----|
      DCD    1   ----*
      GND    5   ---------------*----  4  Ground
                                |
                                *----  9  Common
      RI     9   ----*
                     |
      RxD    2   ----*---------------  2  On Battery
      TxD    3   ----------[####]----  1  Kill UPS Power
                           4.7K ohm
 
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