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

Before beginning installation, review these requirements and follow Steps 1 through 3 below.

• The Liebert MultiLink software—Advanced or Fundamental; Advanced is available on CD; 

Fundamental is downloadable at:

Visit the Web site or contact your local Emerson representative, value-added reseller, or 

distributor for information.

• This manual—downloadable from the Liebert MultiLink Web site:

• A Liebert UPS linked to a computer.
• For requirements specific to various operating systems, see the Liebert MultiLink Web site,

• A communications link between the UPS and the computer, depending on the type of connection:

• With an SNMP card in the UPS, an available IP port—either 161 and 162 or Liebert-reserved 

ports 3027 and 3029—depending on your operating system and configuration (see 

• TCP/IP connectivity throughout the network, if the UPS is equipped with an SNMP card or if 

Liebert MultiLink will monitor or communicate with more than one UPS or computer.

1. Check with your System Administrator about the need to disable certain network software (see 

Appendix C - Technical Information & Frequently Asked Questions). 

2. For a serial port connection to the UPS, you will need to buy or make a custom cable. Liebert 

MultiLink will NOT function properly with an ordinary serial cable connected to the UPS. 

• You may purchase a cable by contacting your local Emerson representative, value-added 

reseller or distributor (see Appendix E - Ordering Parts for part numbers). 

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

3. For configurations in which the source of events is to be a UPS with an SNMP agent, be sure to 

include the IP address of the computer(s) on which Liebert MultiLink is to be installed in the 

SNMP agent’s list of trap recipients. This speeds notifications about the UPS’s condition to the 

computer.

Contact Closure

(Same as Serial Communications)
• A special serial cable—available from Liebert or built with instructions in 

Appendix B - Making Your Own Liebert MultiLink UPS Cable of this manual

• An available serial port on the computer protected by the UPS (see 

Appendix C - Technical Information & Frequently Asked Questions)

USB 

(if the UPS has

a USB port)

• A USB cable with a Type A connector on one end (to connect to the computer) and a 

Type B connector on the other (to connect to the UPS)

• An available USB port—or an adapter from the computer’s serial port to the Type A 

connector end of the USB cable—on the computer protected by the UPS

Serial 

Communications

(Same as Contact Closure)
• A special serial cable—available from Liebert or built with instructions in 

Appendix B - Making Your Own Liebert MultiLink UPS Cable of this manual

• An available serial port on the computer protected by the UPS (see 

Appendix C - Technical Information & Frequently Asked Questions)

SNMP

• Ethernet, Internet or Intranet, utilizing SNMP protocol and IP addresses