Aalborg TIO Totalizer I/O Flow Monitor/Controller - Manual (Page 23)

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If the menu with tabular entry is selected, the available menu options can be set
with the UP and DN buttons and are accepted by pressing the ENT button.
5.3.1 Submenu “Change PP Password”
In order to get access to “Change PP Password” menu, Program Protection must
be disabled. If PP password is set to Zero (Disabled), entering PP Password is not
required and PP can be disabled from “Program Protection” menu (see Figure
5.5). If PP Password is set to any value more than Zero, the firmware will prompt
with “Enter PP Password” (see Figure 5.6). User must enter program protection
code (up to 3 digits). If PP password is lost or forgotten, contact the factory or
your distributor.
NOTE: During data entry the input vales are checked for
acceptability. If data is not acceptable, it is rejected and a message
is generated indicating that the new data has not been accepted.
,