Holley COMMANDER 950 - Manual (Page 54)

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After you enter a filename hit “OK”. The “Trigger” screen below (Figure 37) will appear.
Figure 37
The trigger screen (Figure 37) allows you to start the data logger immediately or wait for a trigger point. The trigger point is a
selectable input such as RPM, TPS, and more. You can input a value for any of these. When the system reaches this value it
will automatically start. The example above would wait for an engine rpm greater than 3000 to start taking data. After
selecting the parameters wanted, hit the “Start Datalog” button. Once the “Start Datalog” button is pressed, the PC starts
monitoring the data stream from the ECU and is looking for the start conditions to be met. This is indicated above the start
button with “waiting for trigger”. If the ECU is not connected or powered up, the datalog will abort (as indicated by printing
“Datalog Aborted” above the start button). If the datalog is aborted, the start button can be pressed again to restart the
datalog session. Once the conditions are met, the PC will start logging data as fast as it can. The sampling speed will
depend on the speed of the PC, but is typically 10-20 samples per second. At the end of the session the user can press
“Stop”, or simply turn off the vehicle.
Once the session is stopped, pressing the start button will restart the session but all prior data will be LOST. This can help if a
datalog is started prematurely and you want to restart it.
NOTE: If you select “Start now” the data logger will automatically start when the “Start Datalog” button is pressed.
If a datalogging session is stopped from the stop button, a continue button pops up. Pressing this button will continue the
datalogging session without starting over. This could be useful when trying to log data while driving in traffic, but you have no
desire to log data at the stoplights.
Viewing Data
After data is saved you can open and review it. Go to “File” and “Open Data File” in the data logger. Select the directory and
filename that you want to open. The following screen will then appear. You can review each point of the data. The following
features are available in the data logger (Figure 35 or 38).
Select Inputs to View – You can select which inputs to view and not view by simply clicking once on the input name on the
bottom of the screen. If the data is not shown the input name will be in black. If it is shown it will be a color other than black.
The color of the name will correspond to the color of the data on the chart. Up to six data points can be graphed at once.
To View a Data Point – To view the values for any point on the graph, move the mouse pointer to a data line at the point you
want to view. When in the correct area, the pointer will turn to a “hand”. Click the left mouse button. This will move to that
point. To move to a different value you can use the arrow keys to move left and right.
Zoom - To zoom in on data, move the mouse to the left portion you would like to zoom to, make sure it the mouse pointer is
an “arrow”, and hold the left mouse button down. Sweep the mouse to the right to the position you want to zoom to and
release the mouse button. You will automatically zoom in. Zoom out by clicking the “Undo Zoom” button.