Emerson AC4 User Manual

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After creating and setting up a connection, use a communications program such as HyperTerminal to 

access the Liebert AC4’s Service Terminal Interface.
1. Verify communications connections between the remote computer and the Liebert AC4. Connect a 

null modem cable from the computer’s COM1 port to the Liebert AC4’s RS232 port (for location, 

see 3.4 - RS232 Connector).

2. Start the HyperTerminal program—click on the Start button, then on Programs, then 

Accessories, then Communications, and finally HyperTerminal. 

3. Open the Liebert AC4 connection created in A.2.1 - Create a Connection. To do this, click on 

File, then on Open, as shown below.

4. In the Open window, shown above right, select the file name—AC4.ht in this example—and then 

click on the Open button.

5. Press Enter (or Escape) to initiate communication and bring up the Main Menu. 

For more information on the Liebert AC4’s options:

• See A.3 - Overview of Menus for examples of the Service Terminal Interface screens.
• See Table 21 to locate step-by-step instructions for each Liebert AC4 function.