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ecmlink101datalogging [2009/05/14 09:19]
twdorris
ecmlink101datalogging [2009/05/14 09:26]
twdorris
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 **NOTE:** With a V3 ECU, it's possible to change ECU settings while a datalog is being captured. ​ Please be aware that doing this can cause a lot of confusion when reviewing the log file because it will not be clear which settings are in place at any given moment in the log. **NOTE:** With a V3 ECU, it's possible to change ECU settings while a datalog is being captured. ​ Please be aware that doing this can cause a lot of confusion when reviewing the log file because it will not be clear which settings are in place at any given moment in the log.
 +
 +===== How logging works =====
 +
 +==== Telling the ECU what to log ====
 +To optimize logging speed, ECMLink uses a "​streaming"​ mode of communication with the ECU while logging. ​ Basically, the application tells the ECU to start sending data and the ECU responds by sending out a constant, repeating sequence of data elements captured from memory. ​ In order for this to work properly, the application and ECU must agree on which data elements are going to be sent and in which order.
 +
 +You tell the ECU what to send by using the Edit->​Captured values (F10) dialog. ​ When ECMLink connects to the ECU, it asks the ECU for a list of what it is currently configured to log.  You then use the captured values dialog to change that list.
 +
 +==== Showing items on the screen ====
 +
 +You may not always want to display every value captured from the ECU.  You might capture 20 different items, but only be interested in seeing 10 particular items on your graph at one time (possibly to reduce screen space or reduce clutter in the graph, for example). ​ You can configure what will be displayed on the graph using the Edit->​Display values (F9) dialog. ​ This menu item only works while viewing a datalog tab.
 +
 +The display values dialog will present you with a list of what can be display given the current set of things captured from the ECU.  If you want to display a value that's not listed in the display values dialog, then you'll need to first tell the ECU to log that value. ​ You do that using the Edit->​Captured values (F10) dialog as described above.
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ecmlink101datalogging.txt ยท Last modified: 2024/03/15 11:16 (external edit)