9 PIN D-SUB Female Connector at the UPS.
| Pin | Description |
|---|---|
| 1 | Unused |
| 2 | Battery power |
| 3 | Unused |
| 4 | Common (same as 7) |
| 5 | Low battery |
| 6 | RS-232 level shutdown |
| 7 | Common (same as 4) |
| 8 | Ground level shutdown (A500 and above, reserved on <A500) |
| 9 | Reserved |
Notes
- Pins 2 and 5 are connected to Common when they are true.
- On pin 6, an rs-232 high level (>9V) will shutdown, when running off the battery.
- On pin 8, shorting to ground will shutdown.