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Communications
8.0COMMUNICATIONS
8.1DB-9 Connector
The UPS has a
When MultiLink is installed on the host computer, the UPS can signal “on battery” and “low battery” using
Table 1 DB-9 pin assignment
DB-9 Pin Assignment Description
1Low Battery (open collector)
2 UPS TxD
3 UPS RxD
4 Battery Mode Shutdown
5Common
6Any Mode Shutdown (short to pin 5)
7 Low Battery (open emitter)
8 Mains Fail (open emitter)
9 Mains Fail (open collector)
Pin Assignment |
| Collector to Emitter* |
| |||
6 | 7 | 8 | 9 |
| (+) | Open |
|
|
|
|
| Collector | |
|
|
|
|
| 330 Ohms |
|
1 | 2 | 3 | 4 | 5 | Open | |
| Emitter |
8.2Remote Shutdown Via the DB-9 Connector
The PowerSure PSI can be shut down remotely by shorting Pins 5 and 6 or via Pins 4 and 5 of the
8.2.1Any Mode Shutdown—Via Pins 5 & 6
When Pin 6 is shorted to Pin 5, the UPS output is shut Off regardless of what mode the UPS is oper- ating in. The UPS cannot be started as long as the pins are shorted. When the short is removed, the UPS output can be enabled by pressing the ON/Alarm Silence/Battery Test button.
8.2.2Battery Mode Shutdown—Via Pins 4 & 5
While the UPS is operating on battery (with no battery test in progress), a
After Pin 4 receives the shutdown signal, a
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