APC BackUPS dumb cable (on-battery only)

01 Mar 1998

connector or cable wiring APC Part# - 940-0023A

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

This cable can only be used on voltage-signalling UPSes, and apparently only provides the On Battery signal. As a consequence, this cable is pretty much useless, because all APC UPSes support more than just On Battery.

         Signal Computer                  UPS 
                DB9F                     DB9M 
          DCD    1   --------------------  2  On Battery 
          
                       3.3K ohm 
          TxD    3   --[####]-* 
                              | 
          DTR    4   ---------* 
          GND    5   ---------------*----  4  Ground 
                                    | 
                                    *----  9  Common 
```                                

![9 pin D-SUB male connector diagram](/img/connector_dsub9m.png)

9 pin D-SUB male connector to the UPS

### Notes

References
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[Category:Miscellaneous Cables](/pinouts/cables/miscellaneous)