UPS devices  > APC pinouts
RJ12 to DB9. Compatible with Rack PDU (AP78xx, AP79xx, AP86xx, AP88xx, AP89xx) and 2G Rack Automatic Transfer Switches (AP7752, AP7752, AP7730, AP7732, AP7721, AP7723). APC part # 940-0144A
Pin Number
Pin Number
1 1 (*)
2 5 (GND)
3 2 (RX)
4 3 (TX)
5 (GND) 5
6 1 (*)

(*) APC pins 1 and 6 are usually not connected

Set 9600 bps, 8 data bits, no parity, 1 stop bit, and no flow control to communicate.

Apply the port settings to establish the connection.
Press 3-5 times to display the username prompt.
Use the default username and password of apc

It is possible to use RJ11 plug that has only the middle 4 pins (2,3,4,5). connected APC pins 2,3, and 4 only and it workes perfect.

6 pin RJ12 (6P6C) female connector layout
6 pin RJ12 (6P6C) female connector
at the UPS
This page contain parts under Copyright © 2000-2018 by team.
No portion of this webpage may be reproduced in any form without providing visible HTML link to . Webmaster permission required in any other cases.
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.