APC Dumb UPS cable (simple)

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connector or cable wiring APC Part# 940-0020 (grey cable). Should work with APC PowerChute Plus software.

9 pin D-SUB male connector layout 9 pin D-SUB male connector to the UPS

9 pin D-SUB female connector diagram 9 pin D-SUB female connector to the computer

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. Full scheme of 940-0020C isn’t 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 
                     
                     

Notes

  • Someone 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.

References

Category:Miscellaneous Cables

 

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