| Pin | Name | Description | 
| 1 | Battery Mode | This pin is shorted to PIN 5 (ground) if the mains power supply fails or is out of tolerance. (NORMALLY OPEN) | 
| 2 | - | - | 
| 3 | - | - | 
| 4 | - | - | 
| 5 | Ground | Ground terminal and common root of contacts at PIN 1, 8 and 9 | 
| 6 | - | - | 
| 7 | UPS shut-down | If a positive signal level (+5V to +12V DC) is applied, the UPS system switches off (PIN 5 is ground) | 
| 8 | Battery Capacity Low | This pin is shorted to PIN 5 (ground) if the batteries have been discharged to such an extent that the remaining stored energy time is less than 2 minutes. (NORMALLY OPEN) | 
| 9 | Battery Mode | The connection between this pin and PIN 5 (ground) is disconnected if the main power supply fails oe is out of tolerance. (NORMALLY CLOSED) |