Logging allows signal data to be saved without message data bytes and IDs. The Logging screen (Figure 1) is accessed from the Measurement menu.
Logging uses the same signal groups as the Signal Plot and Signal List features (Figure 1:). Start by choosing the desired signal group via the Signal Group to Log drop-down list. To change the signals in that group, click on Select Signals. The and buttons can be used to add and remove signal groups.
You can also press the Copy Selected Group button () to duplicate the currently-selected signal group.
Enable the Logging feature for the selected signal group by clicking the checkmark next to Log This Signal Group (Figure 1:). This will activate most of the other controls in the window.
While Logging is active, its status is shown in the upper right corner
This option area sets primary parameters for logging (Figure 1:). These are the options found in this area:
The parameters in this area (Figure 1:) dictate when Vehicle Spy begins logging data. The two options are:
The Enable Pre Start Collection option allows the capture of a number of seconds of data immediately preceding the start trigger.
Choose an option in this box (Figure 1:) to tell Vehicle Spy when logging should stop:
The Zip file when stopped option tells VSpy to compress the logged data in a zip file to save space.
An invalid signal can occur when signal data is cleared in a function block, or when Vehicle Spy starts before signal data is available. The program offers several options to deal with such conditions (Figure 1:): use the last value, leave the value blank, or replace the invalid value with one specified in the Replace with Value field. This last option is handy if other programs are going to chart or graph this data; blank or text entries can be replaced with a value that is still able to be graphed, but is known to be invalid, so it is not confused with valid data.