Pinouts >  UPS devices  >  APC pinouts
9 pin D-SUB male connector layout
9 pin D-SUB male connector
may be used for building your own cable
Pin Signal Description
1 Shut Down (dumb mode) / RS-232 RX In (smart mode) Set high for 1-5 sec to activate shutdown.
2 Line Fail (dumb mode) / RS-232 TX Out (smart mode) On-battery power (normally low but goes high when the UPS switches to batteries)
3 Line Fail signal Mains down (normally low but goes high when line fail)
4,9 GND Ground, chassis
5 Low battery signal (normally low but goes high when low battery)
6 Line fail signal Inverse of pin 2 Line Fail signal
7 UPS Turn-on/off signal (on advanced UPSes only)
8 Unregulated +24 Vdc Out ??  
There are no any reports for this pinout! You may rate this document by clicking the button below.

Is this pinout
APC Smart UPS interface port visual pinout:click to enlarge
Source(s) of this and additional information: UPS FAQ in russian
Copyright © 2000-2022 by team, except user uploaded images.
No portion of this webpage may be reproduced in any form without visible link to .
Efforts have been made to ensure this page is correct, but it is the responsibility of the user to verify the data is correct for their application.