11 Change Log
11.1 Introduction
The indicator contains a change log that records trade significant events. These include changes to trade
relevant settings, creation and clearing of the change log and trade relevant firmware upgrades. Only trade
relevant settings are stored in the change log.
The change log records the following information about each change:
The calibration counter at the time of the change
The date and time of the change
The system database name
setting name that has changed
The menu name of the setting that has changed
The index of the setting that has changed. This is only used for array settings, such as resolution, where
there is a resolution for each range
Previous value of the setting
New value of the setting
The log mask
11.2 Format and Capacity
The change log is stored as a comma separated value (CSV) file. CSV files can be easily viewed in most
spreadsheet programs.
The change log has a maximum size of 512 kilobytes. Records vary in length, but are generally in the order
of 80bytes, giving approximately a 6500 record maximum of the change log. Once the change log is full, the
indicator will refuse to save any setting changes until the change log has been cleared. This can be performed
from the change log setup menu.
11.3 Changelog Security
The change log is stored on the internal indicator filesystem which is not accessible, and hence cannot be
tampered with. The indicator application is the only means by which to access the change log. The indicator
contains Alibi software which allows the change log to be viewed. The Alibi change log viewer is part of the
trade approval.
When a USB disk is attached to the indicator, a copy of the change log can be made to the USB disk. This
copy of the change log can always be verified against internal change log, via the Alibi change log viewer.
57 C500-600-2.0.3
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