Apc 2000 User Manual download pdf (Page 29)

Page 27

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.

■ Outputs 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.

■ The 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.

■ The UPS will shut down when a HI RS-232 level, sustained for 4.5 s, is applied to Pin

1. The UPS responds to this signal, following a delay, only during mains failures (load

is operating from the UPS’s internal power source).

■ An unregulated +24 Vdc appears at Pin 8 of the interface port whenever the UPS is

powered. The supply is limited to 40 mAdc maximum.

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Apc 2000 User Manual Page 29