Before you can use the UPS monitoring software program, you need to install the cable connecting the UPS system to the serial port on the computer. All new UPS systems have the serial communications port on the back panel, labeled RS-232C. The cable for most UPS units is made with two male DB-9 connectors. It connects between the female DB-9 connector on the UPS rear panel and any compatible serial port on the computer. Be sure the cable is shielded and is terminated on the shell of the connector. This section describes cables connecting the UPS to a serial port on your computer. See the next section, “Switch Contact Port Cabling,” for information on constructing a cable to use the port labeled “UPS Port” on the back of many Alpha Micro computers.

There are three possible cable configurations:
The first is for UPS units purchased between December 1989 and December 1991.
The second is for units purchased since December 1991, except for Series 1400+, 1400S+, and 1400XL+.
The third cable configuration is for all Series 1400+,1400S+ and 1400XL+ units. Make sure you use a DB-9 connector hood with a metallized shell. This allows the drain wires in the connector cable to make a good electrical contact with the metal shell in the connector.

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