UPS devices  > APC pinouts
APC Part# 940-0020 (grey cable). Should work with APC PowerChute Plus software.

This cable can only be used on voltage-signalling UPSes, and provides the On Battery signal as well as kill UPS power (and may be Low Battery signal).

UPS
Signal Name
DB-9 Male
(UPS end)
DB-9 Female
(PC end)
PC
Signal Name
Shutdown 1 4 DTR
AC Fail 2 8 CTS
Common 4,9 5 GND

 

     APC Part# - 940-0020B (investigated by apcupsd team)

     Signal Computer                  UPS
            DB9F                     DB9M
      CTS    8   --------------------  2  On Battery
      DTR    4   --------------------  1  Kill power
      GND    5   ---------------*----  4  Ground
                                |
                     ---        *----  9  Common
      DCD    1  ----|///|-----------   5  Low Battery
                    |\|
      RTS    7  ----|///| (probably a
                     ---   semi-conductor)

Note: sides swapped.

Compatible with Back-UPS BK500MC, BK300C, BK650MC, Smart-UPS VS SUVS420, SUVS650, SUVS1000, SUVS1400

 

Full scheme of 940-0020C isnt yet known.

     APC Part# - 940-0020C (investigated by apcupsd team)

     Signal Computer                  UPS
            DB9F                     DB9M
      CTS    8   --------------------  2  On Battery
      DTR    4   --------------------  1  Kill power
      GND    5   ---------------*----  4  Ground
                                |
                                *----  9  Common
      RTS    7 -----[ 93.5K ohm ]----- 5  Low Battery
                    or semi-conductor

Our users reports that the 20C is designed to mimic a mouse movement when it received an on battery signal from the Back-UPS. Therefore the computer will wake up and shutdown properly. The 20B cable does not have this functionality.

 

Full scheme of 940-0020C.

     APC Part# - 940-0020C (Scheme is redrawn with the destruction of the gray cable)

     Signal Computer                  UPS
            DB9F                     DB9M
       RI    9 --*
                 |
      CTS    8 --*-------------------- 2  On Battery
      DTR    4 ----------------------- 1  Kill power
      GND    5 ----------------------- 4  Ground
      RTS    7 --*-[47K]-*-----[47K]-- 5  Low Battery
                E|       |
                  \| B   |
                C  |-----*
      DCD    1 ---/| PNP 2n3906

 

Compatible with Back-UPS Pro PNP BP280PNP, BP420PNP, BP650PNP, BP280C, BP420C, BP650C, BP1000, BP1100, BP1400

9 pin D-SUB male connector layout
9 pin D-SUB male connector
at the Computer
Source(s) of this and additional information: www.apcupsd.com, UPS FAQ in russian
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