8.2 Capturing data logs 8 TROUBLESHOOTING AND DATA LOGGING
• Datalog button - selects the input pin used for the button if used.
• Trigger - Specify whether the log is to be triggered by RPM, MAP, or throttle position.
• LED indicator - selects the output used for the optional LED indicator. This output is on when SD card data
logging is active.
• Log data block size
– 64 byte is the most common setting
– 64 byte + stream allows the simultaneous recording of data and a 8kHz mono sound input. This could
be used as a commentary during a datalog such as position on a racetrack or notable incidents in the
log. Presently the tuning software does not support extracting this audio data.
– 128 byte allows logging twice as many settings, at half the maximum logging speed.
• Interleave GPS Data - Enables the recording of interleaved GPS data. Requires a CAN connected GPS
module.
• Sampling
– Timed - a data sample is taken at predefined time interval - this is the most common option
– every tooth, every cycle - for special logging and at low engine speeds, these options take a data sample
at these events
• Sample interval - how often to take a data sample. 3ms is the fastest supported, but many cards will only
sustain 5ms before you start getting small gaps in the logs. See the utilities section for speed testing. The
frames per second that this sample interval works out to is displayed below this setting.
• Log file max duration - how long each datalog should be. The files are always created full size and fill up
the allocated space during logging. If the log file is filled, a new file is started. If you turn off the power to the
MS3Pro (which is safe to do during a log) the log will be there and will show full size. When the log file is
extracted, the unused part of the allocated file will be ignored. (Note, it is impossible for the MS3Pro to set
the file length or otherwise "clean up" the log file in this case because there is no power and the processor is
off !) A result of this is that all log files on the SD card will appear the same size.
• Stream input - where the 0-5V audio input is connected, if using the stream option.
• SPI Comms Speed - Allows you to adjust the speed if you have swapped the SD card for one that does not
run at normal logging speed.
• Trigger pulse output - The MS3Pro will pulse this output at the start of recording, if using triggered or button
mode. Use this to sync an SD card data log to a video recording or other external data acquisition.
Log field selection
The field selector allows you to choose which data fields you want to log. Because of the compact datalog
format, only 64 or 128 bytes are available total, so you need to pick the data that you find most critical. To add a
field, highlight it on the left and then click on > to move it to the right. To remove a field, highlight it on the right and
then click on < to move it to the left.
Button usage
When MS3Pro powers up, it will create an empty datalog file ready for logging. Press and hold the button for
over half a second to start a log. A quick press of the button will end the log. When extracting the log files you will
likely find a blank log file on the card after your real logs, this is normal.
LED flash codes
• Off - SD logging not active
• On (solid) - Ready but not logging
• Fast flashing - Initializing card
• Slow flashing - Logging
• Pause, sequence of flashes - error code (See Error codes section)
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 282
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