Emerson Liebert PSA Line-Interactive UPS 500-1500VA User Manual

If the connection method you selected is Serial port on computer [computer name] (below left 

and in 5.2.2 - Specify the Method of Monitoring the UPS): 

• Specify the serial port of the computer to which the UPS is connected by choosing from the drop-

down list of ports, shown below right. If the port you wish to use is not in the drop-down list, type 

the designation into the box.

For further information, see serial port information for your operating system in 

• If the UPS and computer are not yet linked by a cable or if the UPS uses Contact Closure 

connection, a message window prompts you for the type of connection to be used. 
Refer to 3.1 - Connecting host computer, UPS and targeted clients before making a 

selection. The two types of connections are:

• Contact-closure communications—for UPS models, see Table 1
• Serial communications—for UPS models, see Table 1

Each type requires a custom cable. These cables can be made or purchased. 

• To make a cable, see Appendix B - Making Your Own Liebert MultiLink UPS Cable. 
• To buy a cable, see Appendix E - Ordering Parts.

• Proceed to 5.2.6 - Restrict or Allow Access to Configuration Settings.