Logging
HANtune has the option to write and read data received from target communication into a log file. The logged parameter values are written into a .csv file.
To start recording incoming signal values, enable it by going to “Communication -> Enable Datalogging” or click on the log file button at the bottom status bar: 
When logging is active, the log file button will display the logfile name: 
Pressing this button again will stop logging.
The name of the log file can partially be changed by going to “Communication -> Modify Datalog Filename”.
The current date and time will automatically be appended to the filename each time a new logging is started.
The log file will (by default) be saved in the “log” subfolder in the HANtune folder. If desired, this folder can be changed by going to "Preferences -> User Preferences". Type or browse your desired folder in the "Log Location" field.
Using a spreadsheet capable of reading .csv format, you can examine a log file.
Log File Contents
A log file consists of two parts: a header and log values. Both are in human readable format. The header contains additional information as:
- The name of the project
- The name of the ECU currently connected
- The sample frequency of each DAQ list
- The time and date of the log file
- 2 lines containing a description of signals logged per column. First line contains the protocol used. Second line contains the name of each signal.
Next to the header, the actual log values are written into the file. Each line starts with a timestamp (in Seconds), followed by all the values of the signals received at that time. Each signal value is separated by a semicolon (;). A dot (.) or a comma (,) (depending on your locale settings) denotes a decimal separator. A thousands separator is not used in logfiles.
Reading Log File
HANtune is capable of reading and showing signal values of a previously recorded logfile. The content of that logfile will be displayed on the signal elements on screen.
To start reading a logfile go to "File -> Read Logfile..." and select the desired logfile. After selecting a logfile, a dialog will appear on the HANtune screen:
- The slider can be used to navigate within the logfile. Dragging the slider will move the display of the values accordingly. The position of the slider can also be moved by entering the desired time position of the logfile. Shortcut key: G
or 
Navigate 1 step (1 line) backward or forward in logfile. Shortcut key: Left or Right cursor
or 
Go to Beginning or End of logfile. Shortcut key: B or E
or 
Rewind or Fast-Forward logfile 5x, 10x or 20x (press repeatedly). Speed indicator will change accordingly. Shortcut key: R or W
or 
Play or Pause real-time playback of logfile. Shortcut key: P
Indicator for play back speed. Value 1x indicates real-time playback. Values 5x, 10x or 20x indicate fast-forward or rewind speeds (forward or backward).
