 9 pin D-SUB female connector at the UPS | | Pin | Signal | Description |
| 1 | Shut Down RS232 In or Smart mode RS-232 RX In | Set high for 4.5sec to activate shutdown? |
| 2 | Line Fail RS-232 Out or Smart mode RS-232 TX Out | |
| 3 | Line Fail signal | Normally not shorted to GND |
| 4,9 | GND | Ground, chassis |
| 5 | Low battery signal | Normally not shorted to GND |
| 6 | Line fail signal | Normally shorted to GND |
| 7 | UPS Turn-on/off signal | |
| 8 | Unregulated +24 Vdc Out | |
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