APC BackUPS Office (old) Cable Pinout -
| Pin | Signal | Description |
|---|---|---|
| 1 | 4 and 6 | DSR DTR, Shutdown when set by computer for 1-5 seconds |
| 2 | 8 and 9 | RI CTS, On battery power |
| 3 | 1 and 2 | CD RxD, Low battery |
| 4 | 5 | Ground |
| 5 | 7 | RTS, Begin signalling on other pins |
| 6 |
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