Additional UPS Features
Communication Port
To establish communication between the UPS and a computer, connect your computer to the UPS communication port using the supplied communication cable.
When the communication cable is installed, power management software can exchange data with the UPS. The software polls the UPS for detailed information on the status of the power environment. If a power emergency occurs, the software initiates the saving of all data and an orderly shutdown of the equipment.
The cable pins are identified in Figure 12 and the pin functions are described in Table 2.
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| 5 | 4 | 3 | 2 | 1 |
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| 9 | 8 | 7 | 6 |
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| Figure 12. Communication Port |
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Table 2. Communication Port Pin Assignment |
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Pin | Signal Name | Function |
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| Direction from |
Number |
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| the |
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| Module |
1 | Low Batt | Low Battery relay contact | Out | ||||
2 | RxD | Transmit to external device | Out | ||||
3 | TxD | Receive from external device | In | ||||
| Conditional Power Off: In absence of AC | In | |||||
| level signal for | power, output is turned off until normal AC |
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| >0.4 seconds | power returns |
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4 | No Connection |
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5 | GND | Signal Ground |
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6 | No Connection |
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7 | No Connection |
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8 | AC Fail | AC Fail relay contact |
| Out | |||
9 | Power Source | +V (8 to 24 volts DC power) | Out | ||||
26 | Powerware® 9120 User's Guide 05147426 A Uncontrolled Copy |