Computer Interface Port

Always “On” UPS Systems Inc.

The computer interface port has the following characteristics:

The communication port on the back of the UPS may be connected to a host computer. This port allows the computer to monitor the status of the UPS and control the operation of the UPS. Its major functions include the following:

1.The ability to broadcast a warning when the power fails.

2.The ability to close any open files before the battery reserves are exhausted.

3.The ability to turn off the UPS.

4.The ability to make the UPS perform a self-test.

Some computers are equipped with a serial connector to link with the communication port, in some cases a special plug-in card may be needed.

Open Collector (Dry Contact) Communication

1.Pin 5 and 2 are open collector outputs that must be pulled up to a common referenced supply no greater than +40VDC.

2.The transistors are capable of a maximum non-conductive load of 25mADC, use pin 4 as the common.

3.Pin 5 generates a High to Low signal when the battery inside the UPS has less than 5 minutes back up time left.

4.Pin 2 generates a High to Low signal when the line has failed.

5.Pin 6 will shut down the UPS is a high is sustained for 0.36 seconds.

RS-232 Communication

6.Pin 6 is the RS-232 data input from computer (RX)

7.Pin 9 is the RS-232 data output to computer (TX).

8.Pin 7 is the common or computer ground

NOTE:

1.Switch rating +40V, 25mADC non-inductive.

2.Pin 7 should be connected to computer ground only.