APC Smart-UPS 5G cable pinout diagram @ pinoutguide.com

APC part# 940-0625A, AP940-0625A, AP940-1525A

Compatible with :

Smart-UPS 5G(Serial) SMX750, SMX1000, SMX1500, SMX3000
Smart-UPS 4.5G(Serial) SMT750, SMT1000, SMT1500, SMT2200, SMT3000
Smart-UPS SURTD
Smart-UPS SMC SMC750, SMC1000, SMC1500, SMC2000, SMC3000

The jack in the UPS is actually a 10 pin RJ45 (RJ50). However, you can just as easily use a 8 pin RJ45 connector, which is more standard.

Pin Number (RJ50)	Pin Number (RJ45)	Pin Name	Description	Pin Number (DB9F)
2	1	TxD	Transmit	2
4	3	Frame GND	Chassis Ground	conn.frame
7	6	GND	Signal Ground	5
8	7	RxD	Receive	3

Above is on UPS side,

Basic Wiring Diagram

RJ50 DB9-F

2---------------------------------------2 RD

4-------------------------------------- Chassis GND (To connector frame)

7----------------------------------------5 GND

8---------------------------------------3 TD

N/C 1 & 4 Shorted

N/C 7 & 8 Shorted

AP940-0625A and AP940-1525A have both female PC connectors, so they can be plugged in to a PC serial port

According to 34 reports in our database (32 positive and 2 negative) the APC Smart-UPS 5G cable pinout should be correct.

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Source(s) of this and additional information: , http://www.fatblokeracing.org/ApcupsdCableConfiguration.shtml

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UPS cable schematic

APC Smart-UPS 5G cable pinout