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

In addition to the general requirements listed in 3.0 - What is Required to Use Liebert 

MultiLink?, prospective Liebert MultiLink users must also have these minimal requirements:

• Windows 7, XP, Vista, Server 2003 or Server 2008
• x86/x86-64 processor
• Memory requirements

• 1 GB of RAM—Windows 7, Windows Vista, Server 2008
• 512 MB of RAM—Server 2003, XP Professional

• A display adapter configured for at least 256 colors
• A mouse or other pointing device
• TCP/IP network protocol

1. If you are not using an SNMP hardware card with your UPS, then Liebert MultiLink can use its 

default port settings of 3029/3027, and there is no need to disable the SNMP service.
If you are using an SNMP hardware card with your UPS, there can be a conflict with the SNMP 

ports used. Liebert MultiLink must take ownership of ports 162/161 to communicate with the 

SNMP-enabled UPS. In this case, the Windows SNMP services (if running) will cause a conflict. If 

you are using an SNMP hardware card, you must disable the SNMP services. To check these 

services:

• Run the Computer Management application by pressing the Start button, then clicking on 

Programs, Administrative Tools, and finally Computer Management. 

• Expand  the  Services and Applications item in the tree and then click on Services.

If the services named SNMP Service and SNMP Trap Service are not present or are shown as 

not running (blank status) and Disabled, you may proceed. Otherwise, these services must be 

stopped and/or disabled before you can install Liebert MultiLink.

2. Installation requires Administrative privileges.

The preconfigured serial ports are COM1 through COM4. You may select one of these or enter 

another as appropriate.