UM0272 datasheet(31/40 Pages) STMICROELECTRONICS

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UM0272

Menus

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Press ENT to display the current installation code (Figure 26). Press ENT again to modify

the installation code.

Note:

The CU installation code is displayed in clear and not encrypted with the star symbol (*) as

this menu is only available in Setup mode; the correct password to access the Service level

must have previously been entered.

5.6.5

Access code

The access code is required to enter the CU Setup mode.

●

If an Owner (access level) password is entered, the menu shows the current code.

Press ENT to enter the new code.

●

If a Service (access level) password is entered, the menu shows the current code.

Press ENT to enter the new code. Press ENT to define the code as the Service or

Owner code. Both the owner and the service codes can be modified at this access

level.

After having entered the new code, press ENT to save the new code. At the prompt, press

the 7 key to confirm the new code.

5.6.6

Options

The Options menu sets the parameters of several CU features. Four Option sub-menus are

available (Figure 27). Press the corresponding number to enter the selected sub-menu.

Figure 27.

Option menus

Zones Autobalance

The Zone Automatic Balance sub-menu memorizes the zones balance values once the

installer has installed the balance resistors on the sensor lines. When using this system, a

resistor (Figure 6) without a predetermined value can be used to balance the line. Of

course, if a line balance control is not used, this resistor can be omitted. Once all the

resistors are installed, press the 1 key to store the all the balance resistor values in the CU.

Once the Zones Autobalance feature is enabled, any variation of the resistance triggers an

alarm condition and is processed by the CU.

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