APC UPS smart cable

Cable between APC UPS and serial port of computer. Compatible with newer APC models. APC order part #940-0020C.

Pinout

9 PIN DE-9 FEMALE to the PC.

9 PIN DE-9 MALE to the UPS.

PC		UPS
Pin	Direction	Pin	Description
2		2	RXD
3		1	TXD
5		9	Ground

Note: If you use original PowerChute software, then connect pins 4<->1 (DTR/DCD) and 7<->8 (RTS/CTS) on PC side for cable detection. The NUT software does not require these connections.

Source

• APC Smart Protocol description with links to cable graphics

See also

• APC_UPS_cable The 'dumb' cable which can also be used to connect some APC UPSes

Contributor

• Network UPS tools project
• Stefan Rink - I just edited the description from there and created this wiki page.