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
APC RJ12
Pin Number
PC DB9
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
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