Computer interface port | American Power Conversion 250, 400, 600

6.0 UPS monitoring

6.4 Computer interface port

The computer interface port is diagramed below for your reference. Those with technical abilities wishing to use this port in a special application should be aware of the following limitations and capabilities of the interface.

6.4.1Outputs at pins 3, 5 and 6 are actually open collector outputs which must be pulled up to a common referenced supply no greater than +40 Vdc. The transistors are capable of a maximum non-inductive load of 25 mAdc. Use only Pin 4 as the common.

6.4.2The output at Pin 2 will generate a LO to HI RS-232 level upon transfer of the output load to power derived from the UPS’s battery. The pin is normally at a LO RS-232 level.

6.4.3The UPS will shut down when a HI RS-232 level, sustained for 0.5 s, is applied to Pin 1. The UPS responds to this signal, following a delay, only during utility failures (load is operating from the UPS’s internal power source).

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