| 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 |
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