APC BackUPS Pro cable pinout

connector or cable wiring

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

9 pin D-SUB female connector
to the computer

Pinouts.ru > GPS, UPS, Switches and other devices cables and adapters schematics > Pinout of APC BackUPS Pro cable and layout of 9 pin D-SUB male connector and 9 pin D-SUB female connector	Document status:	correct
Source(s) of this and additional information: UPS FAQ in russian	4 reports
Last updated at Thu Jan 10 2008. Submit additions or corrections for this document.	Is this document correct or incorrect? What is your opinion?

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